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ecs_umn_0216

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Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: guoyanyan <guoyanyan3@huawei.com>
Co-committed-by: guoyanyan <guoyanyan3@huawei.com>
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guoyanyan 2023-03-01 00:22:41 +00:00 committed by zuul
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@ -164,7 +164,7 @@
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0096304614.html">CBR</a></div>
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0096304614.html">Backup Using CBR</a></div>
</div>
</div>

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<div class="p" id="EN-US_TOPIC_0000001128604648__p1852521716489">You can back up ECS data using Cloud Server Backup or Cloud Disk Backup.<ul id="EN-US_TOPIC_0000001128604648__ul18366112610528"><li id="EN-US_TOPIC_0000001128604648__li16366926185213">Cloud Server Backup (recommended): Use this backup function if you want to back up the data of all EVS disks (system and data disks) on an ECS. This prevents data inconsistency caused by time difference in creating a backup.</li><li id="EN-US_TOPIC_0000001128604648__li6193532193917">Cloud Disk Backup: Use this backup function if you want to back up the data of one or more EVS disks (system or data disk) on an ECS. This minimizes backup costs on the basis of data security.</li></ul>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001128604648__section1685231310443"><h4 class="sectiontitle">ECS Backup Procedure</h4><ol id="EN-US_TOPIC_0000001128604648__ol147701510184519"><li id="EN-US_TOPIC_0000001128604648__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0000001128604648__li464234814566">Click <span><img id="EN-US_TOPIC_0000001128604648__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0000001128604648__li1654693454617">Under <strong id="EN-US_TOPIC_0000001128604648__b18308515152819"><span id="EN-US_TOPIC_0000001128604648__text8308215192815">Computing</span></strong>, click <strong id="EN-US_TOPIC_0000001128604648__b130821514288">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0000001128604648__li113648682416">Locate the row that contains the target ECS. Click <strong id="EN-US_TOPIC_0000001128604648__b29177129503">More</strong> in the <strong id="EN-US_TOPIC_0000001128604648__b191716125504">Operation</strong> column and select <strong id="EN-US_TOPIC_0000001128604648__b291721285011">Manage Image/Disk &gt; Create Backup</strong>.<ul id="EN-US_TOPIC_0000001128604648__ul4315152019362"><li id="EN-US_TOPIC_0000001128604648__li12315220163611">If the ECS has been associated with a vault, configure the backup information as prompted.<ul id="EN-US_TOPIC_0000001128604648__ul74118744418"><li id="EN-US_TOPIC_0000001128604648__li164287184411"><strong id="EN-US_TOPIC_0000001128604648__b5847194118180">Server List</strong>: The ECS to be backed up is selected by default.</li><li id="EN-US_TOPIC_0000001128604648__li104214713447"><strong id="EN-US_TOPIC_0000001128604648__b674664614184">Name</strong>: Customize your backup name.</li><li id="EN-US_TOPIC_0000001128604648__li134214754413"><strong id="EN-US_TOPIC_0000001128604648__b1343010551187">Description</strong>: Supplementary information about the backup.</li><li id="EN-US_TOPIC_0000001128604648__li1421372447"><strong id="EN-US_TOPIC_0000001128604648__b163811013198">Full Backup</strong>: If this option is selected, the system will perform full backup for the ECS to be associated. The storage capacity used by the backup increases accordingly.</li></ul>
<div class="section" id="EN-US_TOPIC_0000001128604648__section1685231310443"><h4 class="sectiontitle">ECS Backup Procedure</h4><ol id="EN-US_TOPIC_0000001128604648__ol147701510184519"><li id="EN-US_TOPIC_0000001128604648__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0000001128604648__li464234814566">Click <span><img id="EN-US_TOPIC_0000001128604648__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0000001128604648__li1654693454617">Under <strong id="EN-US_TOPIC_0000001128604648__b1912954454211"><span id="EN-US_TOPIC_0000001128604648__text191291444144210">Computing</span></strong>, click <strong id="EN-US_TOPIC_0000001128604648__b13129184411429">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0000001128604648__li113648682416">Locate the row that contains the target ECS. Click <strong id="EN-US_TOPIC_0000001128604648__b29177129503">More</strong> in the <strong id="EN-US_TOPIC_0000001128604648__b191716125504">Operation</strong> column and select <strong id="EN-US_TOPIC_0000001128604648__b291721285011">Manage Image/Disk/Backup &gt; Create Backup</strong>.<ul id="EN-US_TOPIC_0000001128604648__ul4315152019362"><li id="EN-US_TOPIC_0000001128604648__li12315220163611">If the ECS has been associated with a vault, configure the backup information as prompted.<ul id="EN-US_TOPIC_0000001128604648__ul74118744418"><li id="EN-US_TOPIC_0000001128604648__li164287184411"><strong id="EN-US_TOPIC_0000001128604648__b5847194118180">Server List</strong>: The ECS to be backed up is selected by default.</li><li id="EN-US_TOPIC_0000001128604648__li104214713447"><strong id="EN-US_TOPIC_0000001128604648__b674664614184">Name</strong>: Customize your backup name.</li><li id="EN-US_TOPIC_0000001128604648__li134214754413"><strong id="EN-US_TOPIC_0000001128604648__b1343010551187">Description</strong>: Supplementary information about the backup.</li><li id="EN-US_TOPIC_0000001128604648__li1421372447"><strong id="EN-US_TOPIC_0000001128604648__b163811013198">Full Backup</strong>: If this option is selected, the system will perform full backup for the ECS to be associated. The storage capacity used by the backup increases accordingly.</li></ul>
</li><li id="EN-US_TOPIC_0000001128604648__li1523293617363">If the ECS is not associated with a vault, buy a vault first and then configure the backup information as prompted.<p id="EN-US_TOPIC_0000001128604648__p959812452243"><a name="EN-US_TOPIC_0000001128604648__li1523293617363"></a><a name="li1523293617363"></a>For details, see <em id="EN-US_TOPIC_0000001128604648__i1248374682415">Cloud Backup and Recovery User Guide</em>.</p>
</li></ul>
</li><li id="EN-US_TOPIC_0000001128604648__li175591309446">Click <strong id="EN-US_TOPIC_0000001128604648__b354222122517">OK</strong>. The system automatically creates a backup for the ECS.<p id="EN-US_TOPIC_0000001128604648__p1805632194414">On the <strong id="EN-US_TOPIC_0000001128604648__b873775316237">Backups</strong> tab page, if the status of the backup is <strong id="EN-US_TOPIC_0000001128604648__b7936121217409">Available</strong>, the backup task is successful.</p>
<p id="EN-US_TOPIC_0000001128604648__p12791616192815">The ECS can be restarted if the backup progress of an ECS exceeds 10%. However, to ensure data integrity, restart it after the backup is complete.</p>
</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0000001128604648__section7890518132019"><h4 class="sectiontitle">EVS Disk Backup Procedure</h4><ol id="EN-US_TOPIC_0000001128604648__ol17890418192017"><li id="EN-US_TOPIC_0000001128604648__li1789091817209">Log in to the management console.</li><li id="EN-US_TOPIC_0000001128604648__li7890171852016">Click <span><img id="EN-US_TOPIC_0000001128604648__en-us_topic_0014250631_image1862675853202121_1" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0000001128604648__li68901818132010">Under <strong id="EN-US_TOPIC_0000001128604648__b61859373299"><span id="EN-US_TOPIC_0000001128604648__text1718543742916">Computing</span></strong>, click <strong id="EN-US_TOPIC_0000001128604648__b1518516372293">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0000001128604648__li138904183204">Locate the row that contains the target ECS. Click <strong id="EN-US_TOPIC_0000001128604648__b1746151917415">More</strong> in the <strong id="EN-US_TOPIC_0000001128604648__b34610192416">Operation</strong> column and select <strong id="EN-US_TOPIC_0000001128604648__b493383911298">Create Backup</strong>.<ul id="EN-US_TOPIC_0000001128604648__ul10890418122011"><li id="EN-US_TOPIC_0000001128604648__li28901318112015">If the ECS has been associated with a vault, configure the backup information as prompted.<ul id="EN-US_TOPIC_0000001128604648__ul12890418122010"><li id="EN-US_TOPIC_0000001128604648__li128901518102012"><strong id="EN-US_TOPIC_0000001128604648__b17719174110139">Server List</strong>: The ECS to be backed up is selected by default. Click <span><img id="EN-US_TOPIC_0000001128604648__image53598395422" src="en-us_image_0000001128656892.png" title="Click to enlarge" class="imgResize"></span> to view the disks attached to the ECSs. Select the disks to be backed up.</li><li id="EN-US_TOPIC_0000001128604648__li1789016180208"><strong id="EN-US_TOPIC_0000001128604648__b51371052134118">Name</strong>: Customize your backup name.</li><li id="EN-US_TOPIC_0000001128604648__li168901718172014"><strong id="EN-US_TOPIC_0000001128604648__b106911853174116">Description</strong>: Supplementary information about the backup.</li><li id="EN-US_TOPIC_0000001128604648__li1489017189204"><strong id="EN-US_TOPIC_0000001128604648__b18291318162117">Full Backup</strong>: If this option is selected, the system will perform full backup for the disks to be associated. The storage capacity used by the backup increases accordingly.</li></ul>
<div class="section" id="EN-US_TOPIC_0000001128604648__section7890518132019"><h4 class="sectiontitle">EVS Disk Backup Procedure</h4><ol id="EN-US_TOPIC_0000001128604648__ol17890418192017"><li id="EN-US_TOPIC_0000001128604648__li1789091817209">Log in to the management console.</li><li id="EN-US_TOPIC_0000001128604648__li7890171852016">Click <span><img id="EN-US_TOPIC_0000001128604648__en-us_topic_0014250631_image1862675853202121_1" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0000001128604648__li68901818132010">Under <strong id="EN-US_TOPIC_0000001128604648__b1017816214310"><span id="EN-US_TOPIC_0000001128604648__text181785211435">Computing</span></strong>, click <strong id="EN-US_TOPIC_0000001128604648__b217817224320">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0000001128604648__li138904183204">Locate the row that contains the target ECS. Click <strong id="EN-US_TOPIC_0000001128604648__b1746151917415">More</strong> in the <strong id="EN-US_TOPIC_0000001128604648__b34610192416">Operation</strong> column and select <strong id="EN-US_TOPIC_0000001128604648__b493383911298">Create Backup</strong>.<ul id="EN-US_TOPIC_0000001128604648__ul10890418122011"><li id="EN-US_TOPIC_0000001128604648__li28901318112015">If the ECS has been associated with a vault, configure the backup information as prompted.<ul id="EN-US_TOPIC_0000001128604648__ul12890418122010"><li id="EN-US_TOPIC_0000001128604648__li128901518102012"><strong id="EN-US_TOPIC_0000001128604648__b17719174110139">Server List</strong>: The ECS to be backed up is selected by default. Click <span><img id="EN-US_TOPIC_0000001128604648__image53598395422" src="en-us_image_0000001128656892.png" title="Click to enlarge" class="imgResize"></span> to view the disks attached to the ECSs. Select the disks to be backed up.</li><li id="EN-US_TOPIC_0000001128604648__li1789016180208"><strong id="EN-US_TOPIC_0000001128604648__b51371052134118">Name</strong>: Customize your backup name.</li><li id="EN-US_TOPIC_0000001128604648__li168901718172014"><strong id="EN-US_TOPIC_0000001128604648__b106911853174116">Description</strong>: Supplementary information about the backup.</li><li id="EN-US_TOPIC_0000001128604648__li1489017189204"><strong id="EN-US_TOPIC_0000001128604648__b18291318162117">Full Backup</strong>: If this option is selected, the system will perform full backup for the disks to be associated. The storage capacity used by the backup increases accordingly.</li></ul>
</li><li id="EN-US_TOPIC_0000001128604648__li6890201892017">If the ECS is not associated with a vault, buy a vault first and then configure the backup information as prompted.<p id="EN-US_TOPIC_0000001128604648__p18917194192511"><a name="EN-US_TOPIC_0000001128604648__li6890201892017"></a><a name="li6890201892017"></a>For details, see <em id="EN-US_TOPIC_0000001128604648__i1101192181716">Cloud Backup and Recovery User Guide</em>.</p>
</li></ul>
</li><li id="EN-US_TOPIC_0000001128604648__li8890131812012">Click <strong id="EN-US_TOPIC_0000001128604648__b538510218222">OK</strong>. The system automatically creates a backup for the disk.<p id="EN-US_TOPIC_0000001128604648__p2890171817207">On the <strong id="EN-US_TOPIC_0000001128604648__b12171926244">Backups</strong> tab page, if the status of the backup is <strong id="EN-US_TOPIC_0000001128604648__b161813262416">Available</strong>, the backup task is successful.</p>
@ -23,7 +23,7 @@
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0096304614.html">CBR</a></div>
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0096304614.html">Backup Using CBR</a></div>
</div>
</div>

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@ -123,7 +123,7 @@ LOGGENERATIONS=28
LOGPATH=/var/log/atop </pre>
</li></ul>
</li></ol><ol start="7" id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_ol208703301083"><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li1687015301810">Restart atop.<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p1187183017817"><a name="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li1687015301810"></a><a name="en-us_topic_0178319250_li1687015301810"></a><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b1587114304813"># systemctl restart atop</strong></p>
</li><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li8871143014810">Run the following command to check the status of atop. If <strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b348144877">active (running)</strong> is displayed in the output, atop is running properly.<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p178711230289"><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b1787113301183"># systemctl status atop</strong></p>
</li><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li8871143014810">Run the following command to check the status of atop. If <strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b169521256">active (running)</strong> is displayed in the output, atop is running properly.<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p178711230289"><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b1787113301183"># systemctl status atop</strong></p>
<pre class="screen" id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_screen1170333141215">atop.service - Atop advanced performance monitor
Loaded: loaded (/lib/systemd/system/atop.service; enabled)
Active: active (running) since Sun 2021-07-25 19:29:40 CST; 4s ago
@ -176,32 +176,11 @@ cache pages = 2
cache private = 4
user pages = 8
free pages = 16</pre>
</li><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li828844335017">Set kernel parameters.<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p2408132792515"><a name="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li828844335017"></a><a name="en-us_topic_0178319250_li828844335017"></a>Some kernel parameters control when kdump will be triggered. It is recommended that you set all the parameters as follows:</p>
<pre class="screen" id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_screen155819225116">kernel.hardlockup_panic=1
kernel.panic=5
kernel.panic_on_oops=1
kernel.softlockup_panic=1
kernel.unknown_nmi_panic=1
kernel.nmi_watchdog=1</pre>
</li><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li204637122512">Modify the preceding parameters in file <strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b1470941242213">/etc/sysctl.conf</strong> file and save the file. You can also add the following parameters to the <strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b1685722216229">/etc/sysctl.conf</strong> file:<pre class="screen" id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_screen10855122119511">kernel.panic_on_io_nmi=1
kernel.panic_on_warn=1</pre>
</li><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li18349164365120">Run the following command to restart the system for the configurations to take effect:<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p47991457103213"><a name="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li18349164365120"></a><a name="en-us_topic_0178319250_li18349164365120"></a><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b67994573321"># reboot</strong></p>
</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_section1296112934412"><a name="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_section1296112934412"></a><a name="en-us_topic_0178319250_section1296112934412"></a><h4 class="sectiontitle">Checking Whether kdump Configurations Have Taken Effect</h4><ol id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_ol7179621115215"><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li8167125611819">Run the following command and check whether <strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b1175013718239">crashkernel=auto</strong> is displayed:<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p516611567185"><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b184439922019"># </strong><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b137661386202">cat /proc/cmdline |grep crashkernel</strong></p>
<pre class="screen" id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_screen14166125619182">BOOT_IMAGE=/boot/vmlinuz-3.10.0-514.44.5.10.h142.x86_64 root=UUID=6407d6ac-c761-43cc-a9dd-1383de3fc995 ro crash_kexec_post_notifiers softlockup_panic=1 panic=3 reserve_kbox_mem=16M nmi_watchdog=1 rd.shell=0 fsck.mode=auto fsck.repair=yes net.ifnames=0 spectre_v2=off nopti noibrs noibpb <strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b196851156131915">crashkernel=auto</strong> LANG=en_US.UTF-8</pre>
</li><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li16935634114418">Run the following command and check whether the values of the parameters in bold are the same as the following:<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p516695619181"><a name="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li16935634114418"></a><a name="en-us_topic_0178319250_li16935634114418"></a># <strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b9166956181816">sysctl -a |grep panic</strong></p>
<pre class="screen" id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_screen17167115619186"><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b18352043153910">kernel.hardlockup_panic = 1</strong>
kernel.hung_task_panic = 0
<strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b6911050203916">kernel.panic = 5</strong>
kernel.panic_on_io_nmi = 0
<strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b947115413916">kernel.panic_on_oops = 1</strong>
kernel.panic_on_stackoverflow = 0
kernel.panic_on_unrecovered_nmi = 0
kernel.panic_on_warn = 0
<strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b46411359203917">kernel.softlockup_panic = 1</strong>
<strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b3643115912399">kernel.unknown_nmi_panic = 1</strong>
vm.panic_on_oom = 0</pre>
</li><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li13493637124416">Run the following command and check whether the configuration in the output is correct:<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p12167115691816"><a name="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li13493637124416"></a><a name="en-us_topic_0178319250_li13493637124416"></a><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b1216765616184"># grep core_collector /etc/kdump.conf |grep -v ^"#"</strong></p>
<pre class="screen" id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_screen816775621816">core_collector makedumpfile -l --message-level 1 -d 31</pre>
</li><li id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li593014112441">Run the following command and check whether the path configuration in the output is correct:<p id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_p1167135681813"><a name="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_li593014112441"></a><a name="en-us_topic_0178319250_li593014112441"></a><strong id="EN-US_TOPIC_0000001143214829__en-us_topic_0178319250_b61674563187"># grep path /etc/kdump.conf |grep -v ^"#"</strong></p>

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<ul id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_ul37351029162712"><li id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_li12735132932714">Domain name, project name, and project ID, which can be obtained by performing the following operations:<p id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_p1973542918275"><a name="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_li12735132932714"></a><a name="en-us_topic_0040259342_li12735132932714"></a>Log in to the management console using the cloud account, click the username in the upper right corner, select <strong id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_b171181053141511">My Credentials</strong> from the drop-down list, and obtain the domain name, project name, and project ID on the <strong id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_b1956165671712">My Credentials</strong> page.</p>
</li><li id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_li13735182917270">Quota information, which includes:<ul id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_ul6735102912273"><li id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_li1073516296277">Service name</li><li id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_li6735152972712">Quota type</li><li id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_li773592992718">Required quota</li></ul>
</li></ul>
<p id="EN-US_TOPIC_0000001210881033__en-us_topic_0040259342_p126761744182712"><a href="https://docs.otc.t-systems.com/en-us/public/learnmore.html" target="_blank" rel="noopener noreferrer">Learn how to obtain the service hotline and email address.</a></p>
</div>
</div>
<div>

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<h1 class="topictitle1">(Recommended) Creating a Key Pair on the Management Console</h1>
<div id="body0000001278350057"><div class="section" id="EN-US_TOPIC_0000001278350057__section4859995204421"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0000001278350057__p45751306523">You can use the management console to create a key pair. ECS stores the public key and you store the private key.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001278350057__section35336147204538"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0000001278350057__ol1373281010048"><li id="EN-US_TOPIC_0000001278350057__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0000001278350057__li0975135720214">Click <span><img id="EN-US_TOPIC_0000001278350057__en-us_topic_0014250631_image1733511156361" src="en-us_image_0000001234668870.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0000001278350057__li3861581410048">Under <strong id="EN-US_TOPIC_0000001278350057__b57052041164811"><span id="EN-US_TOPIC_0000001278350057__text1570564144817">Computing</span></strong>, click <strong id="EN-US_TOPIC_0000001278350057__b9706134115481">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0000001278350057__li1199800610048">In the navigation pane on the left, choose <strong id="EN-US_TOPIC_0000001278350057__b162483549591">Key Pair</strong>.</li><li id="EN-US_TOPIC_0000001278350057__li4087319010048">On the <strong id="EN-US_TOPIC_0000001278350057__b9885614153417">Key Pair Service</strong> page, click <strong id="EN-US_TOPIC_0000001278350057__b1840322415452">Create Key Pair</strong>.</li><li id="EN-US_TOPIC_0000001278350057__li55901884715">Enter a key pair name.<p id="EN-US_TOPIC_0000001278350057__p926788112916"><a name="EN-US_TOPIC_0000001278350057__li55901884715"></a><a name="li55901884715"></a>A key pair name consists of two parts: KeyPair and four random digits (KeyPair-xxxx).</p>
<div class="section" id="EN-US_TOPIC_0000001278350057__section35336147204538"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0000001278350057__ol1373281010048"><li id="EN-US_TOPIC_0000001278350057__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0000001278350057__li0975135720214">Click <span><img id="EN-US_TOPIC_0000001278350057__en-us_topic_0014250631_image1733511156361" src="en-us_image_0000001234668870.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0000001278350057__li3861581410048">Under <strong id="EN-US_TOPIC_0000001278350057__b0105739508"><span id="EN-US_TOPIC_0000001278350057__text3105203912015">Computing</span></strong>, click <strong id="EN-US_TOPIC_0000001278350057__b181051439604">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0000001278350057__li1199800610048">In the navigation pane on the left, choose <strong id="EN-US_TOPIC_0000001278350057__b162483549591">Key Pair</strong>.</li><li id="EN-US_TOPIC_0000001278350057__li4087319010048">On the <strong id="EN-US_TOPIC_0000001278350057__b9885614153417">Key Pair Service</strong> page, click <strong id="EN-US_TOPIC_0000001278350057__b1840322415452">Create Key Pair</strong>.</li><li id="EN-US_TOPIC_0000001278350057__li55901884715">Enter a key pair name.<p id="EN-US_TOPIC_0000001278350057__p926788112916"><a name="EN-US_TOPIC_0000001278350057__li55901884715"></a><a name="li55901884715"></a>A key pair name consists of two parts: KeyPair and four random digits (KeyPair-xxxx).</p>
</li><li id="EN-US_TOPIC_0000001278350057__li21039497612">Click <strong id="EN-US_TOPIC_0000001278350057__b19193410164516">OK</strong>.</li><li id="EN-US_TOPIC_0000001278350057__li22000910048">Manually or automatically download a .pem private key file with the name that you specify as the key name. Store it in a secure place and click <strong id="EN-US_TOPIC_0000001278350057__b9321655175319">OK</strong>.<div class="note" id="EN-US_TOPIC_0000001278350057__note118145116483"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0000001278350057__p158141810481">This is the only chance for you to save the private key file. Keep it secure. You'll need to provide the key pair name when you create an ECS, and the corresponding private key each time you connect to the ECS through SSH.</p>
</div></div>
</li></ol>

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</div></div>
</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001278734873__section62005706143441"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0000001278734873__ol49887931143442"><li id="EN-US_TOPIC_0000001278734873__li4261248104818">Log in to the management console.</li><li id="EN-US_TOPIC_0000001278734873__li464234814566">Click <span><img id="EN-US_TOPIC_0000001278734873__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0000001278734873__li44979101143442">Under <strong id="EN-US_TOPIC_0000001278734873__b181740554484"><span id="EN-US_TOPIC_0000001278734873__text8174165544811">Computing</span></strong>, click <strong id="EN-US_TOPIC_0000001278734873__b11174155184811">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0000001278734873__li2158728143442">In the navigation pane on the left, choose <strong id="EN-US_TOPIC_0000001278734873__b46541856518">Key Pair</strong>.</li><li id="EN-US_TOPIC_0000001278734873__li32291957143442">On the <strong id="EN-US_TOPIC_0000001278734873__b1535364720341">Key Pair Service</strong> page, click <strong id="EN-US_TOPIC_0000001278734873__b196332291428">Import Key Pair</strong>.<div class="fignone" id="EN-US_TOPIC_0000001278734873__fig30209536143442"><span class="figcap"><b>Figure 1 </b>Import Public Key</span><br><span><img id="EN-US_TOPIC_0000001278734873__image154212135343" src="en-us_image_0000001234671514.png" title="Click to enlarge" class="imgResize"></span></div>
<div class="section" id="EN-US_TOPIC_0000001278734873__section62005706143441"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0000001278734873__ol49887931143442"><li id="EN-US_TOPIC_0000001278734873__li4261248104818">Log in to the management console.</li><li id="EN-US_TOPIC_0000001278734873__li464234814566">Click <span><img id="EN-US_TOPIC_0000001278734873__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0000001278734873__li44979101143442">Under <strong id="EN-US_TOPIC_0000001278734873__b1474393516210"><span id="EN-US_TOPIC_0000001278734873__text127438352029">Computing</span></strong>, click <strong id="EN-US_TOPIC_0000001278734873__b147431835626">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0000001278734873__li2158728143442">In the navigation pane on the left, choose <strong id="EN-US_TOPIC_0000001278734873__b46541856518">Key Pair</strong>.</li><li id="EN-US_TOPIC_0000001278734873__li32291957143442">On the <strong id="EN-US_TOPIC_0000001278734873__b1535364720341">Key Pair Service</strong> page, click <strong id="EN-US_TOPIC_0000001278734873__b196332291428">Import Key Pair</strong>.<div class="fignone" id="EN-US_TOPIC_0000001278734873__fig30209536143442"><span class="figcap"><b>Figure 1 </b>Import Public Key</span><br><span><img id="EN-US_TOPIC_0000001278734873__image154212135343" src="en-us_image_0000001234671514.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="EN-US_TOPIC_0000001278734873__li37898602143442">Use either of the following methods to import the key pair:<ul id="EN-US_TOPIC_0000001278734873__ul4210955143442"><li id="EN-US_TOPIC_0000001278734873__li57034482143442">Selecting a file<ol type="a" id="EN-US_TOPIC_0000001278734873__ol1214990115226"><li id="EN-US_TOPIC_0000001278734873__li2371687115226">In the <strong id="EN-US_TOPIC_0000001278734873__b842352706112651">Import Key Pair</strong> dialog box of the management console, click <strong id="EN-US_TOPIC_0000001278734873__b842352706112725">Select File</strong> and select the locally stored public key file (for example, the .txt file saved in <a href="en-us_topic_0000001234335274.html#EN-US_TOPIC_0000001234335274__li18403111116343">3</a> in <a href="en-us_topic_0000001234335274.html">Creating a Key Pair Using PuTTYgen</a>).<div class="note" id="EN-US_TOPIC_0000001278734873__note2825014412158"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0000001278734873__p5292471112158">Make sure that the file to be imported is a public key file.</p>
</div></div>
</li><li id="EN-US_TOPIC_0000001278734873__li36968064152326">Click <strong id="EN-US_TOPIC_0000001278734873__b3851022171115">OK</strong>.<p id="EN-US_TOPIC_0000001278734873__p53154419152328">After the public key is imported, you can change its name.</p>

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<a name="EN-US_TOPIC_0000001449637793"></a><a name="EN-US_TOPIC_0000001449637793"></a>
<h1 class="topictitle1">Data Protection</h1>
<div id="body8662426"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="en-us_topic_0046912051.html">User Encryption</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0092435778.html">Security</a></div>
</div>
</div>

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<a name="EN-US_TOPIC_0013771089"></a><a name="EN-US_TOPIC_0013771089"></a>
<h1 class="topictitle1">Login Overview</h1>
<div id="body13189358"><div class="section" id="EN-US_TOPIC_0013771089__section15584113212291"><h4 class="sectiontitle">Constraints</h4><ul id="EN-US_TOPIC_0013771089__ul133171656112916"><li id="EN-US_TOPIC_0013771089__li1272572019368">Only a running <span id="EN-US_TOPIC_0013771089__text154442415251">ECS</span> can be logged in.</li><li id="EN-US_TOPIC_0013771089__li113176563299">For ECSs created using public images, login usernames, passwords, and constraints vary depending on OSs running on the ECSs. For details, see <em id="EN-US_TOPIC_0013771089__i129215466243"><a href="https://docs.otc.t-systems.com/en-us/ims/index.html" target="_blank" rel="noopener noreferrer">Public Images Introduction</a></em>.</li></ul>
<div id="body13189358"><div class="section" id="EN-US_TOPIC_0013771089__section15584113212291"><h4 class="sectiontitle">Constraints</h4><ul id="EN-US_TOPIC_0013771089__ul133171656112916"><li id="EN-US_TOPIC_0013771089__li1272572019368">Only a running <span id="EN-US_TOPIC_0013771089__text154442415251">ECS</span> can be logged in.</li><li id="EN-US_TOPIC_0013771089__li113176563299">For ECSs created using public images, login usernames, passwords, and constraints vary depending on OSs running on the ECSs. For details, see <em id="EN-US_TOPIC_0013771089__i129215466243"><a href="https://docs.otc.t-systems.com/image-management-service/public-images/" target="_blank" rel="noopener noreferrer">Public Images Introduction</a></em>.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0013771089__section95820318444"><h4 class="sectiontitle">Login Modes</h4><p id="EN-US_TOPIC_0013771089__p649275015440">Select a login mode as required and log in to the target <span id="EN-US_TOPIC_0013771089__text526311338199">ECS</span>.</p>
<div class="section" id="EN-US_TOPIC_0013771089__section95820318444"><h4 class="sectiontitle">Login Modes</h4><p id="EN-US_TOPIC_0013771089__p649275015440">You can choose from a variety of login modes based on your local OS type.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0013771089__table69409501234" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Linux ECS login modes</caption><thead align="left"><tr id="EN-US_TOPIC_0013771089__row194115501339"><th align="left" class="cellrowborder" valign="top" width="12.58125812581258%" id="mcps1.3.2.3.2.5.1.1"><p id="EN-US_TOPIC_0013771089__p5941165020317">ECS OS</p>
</th>
@ -20,7 +20,7 @@
<td class="cellrowborder" valign="top" width="15.191519151915193%" headers="mcps1.3.2.3.2.5.1.2 "><p id="EN-US_TOPIC_0013771089__p139417507315">Windows</p>
</td>
<td class="cellrowborder" valign="top" width="43.154315431543154%" headers="mcps1.3.2.3.2.5.1.3 "><p id="EN-US_TOPIC_0013771089__p394117501734">Use a remote login tool, such as PuTTY or Xshell.</p>
<ul id="EN-US_TOPIC_0013771089__ul294114501734"><li id="EN-US_TOPIC_0013771089__li1394185020312">Password-authenticated: <a href="en-us_topic_0017955633.html#EN-US_TOPIC_0017955633__section62068112020">Logging In to the Linux ECS from a Local Windows Server</a></li><li id="EN-US_TOPIC_0013771089__li794110507317">Key-pair-authenticated: <a href="en-us_topic_0017955380.html#EN-US_TOPIC_0017955380__section47918167111724">Logging In to the Linux ECS from Local Windows Server</a></li></ul>
<ul id="EN-US_TOPIC_0013771089__ul294114501734"><li id="EN-US_TOPIC_0013771089__li1394185020312">Password-authenticated: <a href="en-us_topic_0017955633.html#EN-US_TOPIC_0017955633__section62068112020">Logging In to a Linux ECS from a Local Windows Server</a></li><li id="EN-US_TOPIC_0013771089__li794110507317">Key-pair-authenticated: <a href="en-us_topic_0017955380.html#EN-US_TOPIC_0017955380__section47918167111724">Logging In to a Linux ECS from a Local Windows Server</a></li></ul>
</td>
<td class="cellrowborder" rowspan="2" valign="top" width="29.072907290729074%" headers="mcps1.3.2.3.2.5.1.4 "><p id="EN-US_TOPIC_0013771089__p109411650734">The target ECS has an EIP bound.</p>
<p id="EN-US_TOPIC_0013771089__p188747342010"></p>
@ -29,7 +29,7 @@
<tr id="EN-US_TOPIC_0013771089__row1994195019319"><td class="cellrowborder" valign="top" headers="mcps1.3.2.3.2.5.1.1 "><p id="EN-US_TOPIC_0013771089__p69411050137">Linux</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.3.2.5.1.2 "><p id="EN-US_TOPIC_0013771089__p16941450032">Run commands.</p>
<ul id="EN-US_TOPIC_0013771089__ul994119501938"><li id="EN-US_TOPIC_0013771089__li6941850232">Password-authenticated: <a href="en-us_topic_0017955633.html#EN-US_TOPIC_0017955633__section20811823174313">Logging In to the Linux ECS from a Local Linux Server</a></li><li id="EN-US_TOPIC_0013771089__li49415501833">Key-pair-authenticated: <a href="en-us_topic_0017955380.html#EN-US_TOPIC_0017955380__section3666784111724">Logging In to the Linux ECS from Local Linux Server</a></li></ul>
<ul id="EN-US_TOPIC_0013771089__ul994119501938"><li id="EN-US_TOPIC_0013771089__li6941850232">Password-authenticated: <a href="en-us_topic_0017955633.html#EN-US_TOPIC_0017955633__section20811823174313">Logging In to a Linux ECS from a Local Linux Server</a></li><li id="EN-US_TOPIC_0013771089__li49415501833">Key-pair-authenticated: <a href="en-us_topic_0017955380.html#EN-US_TOPIC_0017955380__section3666784111724">Logging In to a Linux ECS from a Local Linux Server</a></li></ul>
</td>
</tr>
<tr id="EN-US_TOPIC_0013771089__row1894116502312"><td class="cellrowborder" valign="top" headers="mcps1.3.2.3.2.5.1.1 "><p id="EN-US_TOPIC_0013771089__p139411250137">Windows</p>

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<a name="EN-US_TOPIC_0013771092"></a><a name="EN-US_TOPIC_0013771092"></a>
<h1 class="topictitle1">General Operations for Modifying Specifications</h1>
<h1 class="topictitle1">General Operations</h1>
<div id="body48598242"><div class="section" id="EN-US_TOPIC_0013771092__en-us_topic_0013859511_section14602858172718"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0013771092__en-us_topic_0013859511_a2c9a6797f65d44aba4ec9d2961d46223">If <span id="EN-US_TOPIC_0013771092__text1585123774017">ECS</span> specifications do not meet service requirements, you can modify the <span id="EN-US_TOPIC_0013771092__text19594312154512">ECS</span> specifications, including vCPUs and memory. Certain <span id="EN-US_TOPIC_0013771092__text13759153719401">ECS</span>s allow you to change their types when you modify their specifications.</p>
</div>
<ul id="EN-US_TOPIC_0013771092__ul71498497489"><li id="EN-US_TOPIC_0013771092__li187991852145314">For instructions about how to modify the specifications of other ECSs, for example, between KVM ECSs, see this section.</li></ul>
@ -10,12 +10,12 @@
</div>
<div class="section" id="EN-US_TOPIC_0013771092__en-us_topic_0013859511_section57753505172833"><h4 class="sectiontitle">Notes</h4><ul id="EN-US_TOPIC_0013771092__en-us_topic_0013859511_ul35475327193536"><li id="EN-US_TOPIC_0013771092__en-us_topic_0013859511_li63799810105126">If <span id="EN-US_TOPIC_0013771092__text911941164015">ECS</span> specifications are downgraded, the <span id="EN-US_TOPIC_0013771092__text13383153964912">ECS</span> performance will deteriorate.</li><li id="EN-US_TOPIC_0013771092__li344174672418">Certain ECS types do not support specifications modification currently. For details about available ECS types as well as their functions and usage, see "Notes" in <a href="en-us_topic_0035470096.html">ECS Types</a>.</li><li id="EN-US_TOPIC_0013771092__li143963249488">When the disk status is <strong id="EN-US_TOPIC_0013771092__b1045710382410">Expanding</strong>, you are not allowed to modify the specifications of the <span id="EN-US_TOPIC_0013771092__text163331642194016">ECS</span> where the disk is attached.</li><li id="EN-US_TOPIC_0013771092__li14961154101510">Before modifying the specifications of a Windows ECS, modify the SAN policy by following the instructions provided in <a href="en-us_topic_0114225937.html">Why Does a Disk Attached to a Windows ECS Go Offline?</a> to prevent disks from going offline after the specifications are modified.</li><li id="EN-US_TOPIC_0013771092__li883917325184">Before modifying specifications, make sure that the <span id="EN-US_TOPIC_0013771092__text17235243154011">ECS</span> has been stopped.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0013771092__section997143905215"><h4 class="sectiontitle">Step 1: Modify Specifications</h4><ol id="EN-US_TOPIC_0013771092__ol97324075216"><li id="EN-US_TOPIC_0013771092__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0013771092__li464234814566">Click <span><img id="EN-US_TOPIC_0013771092__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0013771092__li17112406525">Under <strong id="EN-US_TOPIC_0013771092__b125682153314"><span id="EN-US_TOPIC_0013771092__text162568215330">Computing</span></strong>, click <strong id="EN-US_TOPIC_0013771092__b162560220331">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0013771092__li117214409522">On the <strong id="EN-US_TOPIC_0013771092__b1234022165217">Elastic Cloud Server</strong> page, view the status of the target <span id="EN-US_TOPIC_0013771092__text10467144714020">ECS</span>.<p id="EN-US_TOPIC_0013771092__p144608369486">If the ECS is not in <strong id="EN-US_TOPIC_0013771092__b842352706113828">Stopped</strong> state, click <strong id="EN-US_TOPIC_0013771092__b842352706113834">More</strong> in the <strong id="EN-US_TOPIC_0013771092__b133847578419153">Operation</strong> column and select <strong id="EN-US_TOPIC_0013771092__b842352706123127">Stop</strong>.</p>
<div class="section" id="EN-US_TOPIC_0013771092__section997143905215"><h4 class="sectiontitle">Step 1: Modify Specifications</h4><ol id="EN-US_TOPIC_0013771092__ol97324075216"><li id="EN-US_TOPIC_0013771092__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0013771092__li464234814566">Click <span><img id="EN-US_TOPIC_0013771092__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0013771092__li17112406525">Under <strong id="EN-US_TOPIC_0013771092__b3638102312188"><span id="EN-US_TOPIC_0013771092__text1363722316183">Computing</span></strong>, click <strong id="EN-US_TOPIC_0013771092__b17638192311814">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0013771092__li117214409522">On the <strong id="EN-US_TOPIC_0013771092__b1234022165217">Elastic Cloud Server</strong> page, view the status of the target <span id="EN-US_TOPIC_0013771092__text10467144714020">ECS</span>.<p id="EN-US_TOPIC_0013771092__p144608369486">If the ECS is not in <strong id="EN-US_TOPIC_0013771092__b842352706113828">Stopped</strong> state, click <strong id="EN-US_TOPIC_0013771092__b842352706113834">More</strong> in the <strong id="EN-US_TOPIC_0013771092__b133847578419153">Operation</strong> column and select <strong id="EN-US_TOPIC_0013771092__b842352706123127">Stop</strong>.</p>
</li><li id="EN-US_TOPIC_0013771092__li572184075211">Click <strong id="EN-US_TOPIC_0013771092__b25955399219229">More</strong> in the <strong id="EN-US_TOPIC_0013771092__b211788459919229">Operation</strong> column and select <strong id="EN-US_TOPIC_0013771092__b84235270619250">Modify Specifications</strong>.<p id="EN-US_TOPIC_0013771092__p20946954194414">The <strong id="EN-US_TOPIC_0013771092__b842352706172049">Modify ECS Specifications</strong> page is displayed.</p>
</li><li id="EN-US_TOPIC_0013771092__li137218401522">Select the new <span id="EN-US_TOPIC_0013771092__text1626718488409">ECS</span> type, vCPUs, and memory as prompted.</li><li id="EN-US_TOPIC_0013771092__li654534825212">(Optional) Set <strong id="EN-US_TOPIC_0013771092__b8423527062212">DeH</strong>.<p id="EN-US_TOPIC_0013771092__p196261841172818">If the ECS is created on a DeH, the system allows you to change the DeH.</p>
<p id="EN-US_TOPIC_0013771092__p1730463595012">To do so, select the target DeH from the drop-down list. If no DeH is available in the drop-down list, remaining DeH resources are insufficient and cannot be used to create the ECS with specifications modified.</p>
</li><li id="EN-US_TOPIC_0013771092__li19732406526">Click <strong id="EN-US_TOPIC_0013771092__en-us_topic_0013859511_b84235270613416">Next</strong>.</li><li id="EN-US_TOPIC_0013771092__li2073740175218">On the <strong id="EN-US_TOPIC_0013771092__b842352706171753">Modify ECS Specifications</strong> page, confirm the modified vCPU and memory specifications and click <strong id="EN-US_TOPIC_0013771092__b842352706171854">Submit</strong>.</li><li id="EN-US_TOPIC_0013771092__li4711114720243">Check whether the specifications have been modified.<p id="EN-US_TOPIC_0013771092__p9749161119245"><a name="EN-US_TOPIC_0013771092__li4711114720243"></a><a name="li4711114720243"></a>After modifying the specifications, you can check whether the specifications have been modified in <strong id="EN-US_TOPIC_0013771092__b1222491910231911">Failures</strong>.</p>
<ol type="a" id="EN-US_TOPIC_0013771092__ol142539992417"><li id="EN-US_TOPIC_0013771092__li142511395248">Check whether <strong id="EN-US_TOPIC_0013771092__b38312896231932">Failures</strong> is displayed on the management console. For details, see <a href="en-us_topic_0108255889.html">Viewing Failures</a>.<ul id="EN-US_TOPIC_0013771092__ul1925149152416"><li id="EN-US_TOPIC_0013771092__li102516982413">If yes, go to step <a href="#EN-US_TOPIC_0013771092__li6253192246">10.b</a>.</li><li id="EN-US_TOPIC_0013771092__li1251792246">If no, the specifications have been modified.</li></ul>
<ol type="a" id="EN-US_TOPIC_0013771092__ol142539992417"><li id="EN-US_TOPIC_0013771092__li142511395248">Check whether <strong id="EN-US_TOPIC_0013771092__b38312896231932">Failures</strong> is displayed on the management console. For details, see <a href="en-us_topic_0108255889.html">Viewing Failure Tasks</a>.<ul id="EN-US_TOPIC_0013771092__ul1925149152416"><li id="EN-US_TOPIC_0013771092__li102516982413">If yes, go to step <a href="#EN-US_TOPIC_0013771092__li6253192246">10.b</a>.</li><li id="EN-US_TOPIC_0013771092__li1251792246">If no, the specifications have been modified.</li></ul>
</li><li id="EN-US_TOPIC_0013771092__li6253192246"><a name="EN-US_TOPIC_0013771092__li6253192246"></a><a name="li6253192246"></a>Click <strong id="EN-US_TOPIC_0013771092__b84235270617246">Failures</strong>. Then, in the <strong id="EN-US_TOPIC_0013771092__b84235270617249">Failures</strong> dialog box, click <strong id="EN-US_TOPIC_0013771092__b842352706144228">Operation Failures</strong> and check whether the task is contained in the list by <strong id="EN-US_TOPIC_0013771092__b842352706172633">Name/ID</strong>, <strong id="EN-US_TOPIC_0013771092__b842352706172637">Operated At</strong>, or <strong id="EN-US_TOPIC_0013771092__b842352706143412">Task</strong>.<ul id="EN-US_TOPIC_0013771092__ul1325379162412"><li id="EN-US_TOPIC_0013771092__li152539915242">If yes, the specifications modification failed. See <a href="#EN-US_TOPIC_0013771092__section9461027528">Follow-up Procedure</a> for failure causes.</li><li id="EN-US_TOPIC_0013771092__li15253149162415">If no, the specifications have been modified.</li></ul>
</li></ol>
</li></ol>
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<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0030828258.html">Modifying ECS vCPU and Memory Specifications</a></div>
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0030828258.html">Modifying ECS Specifications</a></div>
</div>
</div>

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</li>
<li class="ulchildlink"><strong><a href="en-us_topic_0176502615.html">Managing ECSs</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="en-us_topic_0030828258.html">Modifying ECS vCPU and Memory Specifications</a></strong><br>
<li class="ulchildlink"><strong><a href="en-us_topic_0030828258.html">Modifying ECS Specifications</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="en-us_topic_0133365988.html">Migrating an ECS</a></strong><br>
</li>

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</li><li id="EN-US_TOPIC_0013771111__li34900670183347">Virtual Private Cloud (VPC)<p id="EN-US_TOPIC_0013771111__p176469971706"><a name="EN-US_TOPIC_0013771111__li34900670183347"></a><a name="li34900670183347"></a>Enables you to configure internal networks and change network configurations by customizing security groups, VPNs, IP address ranges, and bandwidth. This simplifies network management. You can also customize the <span id="EN-US_TOPIC_0013771111__text1063192424416">ECS</span> access rules within a security group and between security groups to improve <span id="EN-US_TOPIC_0013771111__text3250413154317">ECS</span> security.</p>
</li><li id="EN-US_TOPIC_0013771111__li23950988183351">Image Management Service (IMS)<p id="EN-US_TOPIC_0013771111__p43435757102316"><a name="EN-US_TOPIC_0013771111__li23950988183351"></a><a name="li23950988183351"></a>Enables you to create <span id="EN-US_TOPIC_0013771111__text3808202613446">ECS</span>s using images. This improves the efficiency of <span id="EN-US_TOPIC_0013771111__text10235163664314">ECS</span> creation.</p>
</li><li id="EN-US_TOPIC_0013771111__li64826549145833">Cloud Eye<p id="EN-US_TOPIC_0013771111__p16459130145833"><a name="EN-US_TOPIC_0013771111__li64826549145833"></a><a name="li64826549145833"></a>Allows you to check the status of monitored service objects after you have obtained an <span id="EN-US_TOPIC_0013771111__text16519193344419">ECS</span>. This can be done without requiring additional plug-ins be installed. For details about ECS metrics supported by Cloud Eye, see <a href="en-us_topic_0030911465.html">Basic ECS Metrics</a>.</p>
</li><li id="EN-US_TOPIC_0013771111__li59799169204844">Key Management Service (KMS)<p id="EN-US_TOPIC_0013771111__p4354864204940"><a name="EN-US_TOPIC_0013771111__li59799169204844"></a><a name="li59799169204844"></a>The encryption feature relies on KMS. You can use an encrypted image or EVS disks when creating an ECS. In such a case, you are required to use the key provided by KMS to improve data security.</p>
</li><li id="EN-US_TOPIC_0013771111__li59799169204844">Key Management Service (KMS)<p id="EN-US_TOPIC_0013771111__p4354864204940"><a name="EN-US_TOPIC_0013771111__li59799169204844"></a><a name="li59799169204844"></a>The encryption feature relies on KMS. You can use an encrypted image or EVS disks when creating an ECS. In such a case, you need to use the key provided by KMS to improve data security.</p>
</li><li id="EN-US_TOPIC_0013771111__li786535134316">Cloud Trace Service (CTS)<p id="EN-US_TOPIC_0013771111__p4315155564311"><a name="EN-US_TOPIC_0013771111__li786535134316"></a><a name="li786535134316"></a>Records <span id="EN-US_TOPIC_0013771111__text86958464447">ECS</span>-related operations for later query, audit, and backtrack.</p>
</li><li id="EN-US_TOPIC_0013771111__li136321044192215">Cloud Backup and Recovery (CBR)<p id="EN-US_TOPIC_0013771111__p176331644192217"><a name="EN-US_TOPIC_0013771111__li136321044192215"></a><a name="li136321044192215"></a>Backs up EVS disks and <span id="EN-US_TOPIC_0013771111__text164149164410">ECS</span>s for restoration. You can back up all EVS disks (including the system disk and data disks) attached to an <span id="EN-US_TOPIC_0013771111__text1918193523512">ECS</span> and use the backup to restore the <span id="EN-US_TOPIC_0013771111__text133244514443">ECS</span> data.</p>
</li><li id="EN-US_TOPIC_0013771111__li31931436604">Tag Management Service (TMS)<p id="EN-US_TOPIC_0013771111__p657945113014"><a name="EN-US_TOPIC_0013771111__li31931436604"></a><a name="li31931436604"></a>Tags can be used to identify ECSs for easy management.</p>

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<a name="EN-US_TOPIC_0013771112"></a><a name="EN-US_TOPIC_0013771112"></a>
<h1 class="topictitle1">What Is <span id="text191201416161518">ECS</span>?</h1>
<div id="body55752527"><p id="EN-US_TOPIC_0013771112__p024184315493">An Elastic Cloud Server (ECS) is a basic computing unit that consists of vCPUs, memory, OS, and Elastic Volume Service (EVS) disks. After an <span id="EN-US_TOPIC_0013771112__text852305312495">ECS</span> is created, you can use it on the cloud similarly to how you would use your local PC or physical server.</p>
<p id="EN-US_TOPIC_0013771112__p47101664518"><span id="EN-US_TOPIC_0013771112__text33411108512">ECS</span>s support self-service creation, modification, and operation. You can create an <span id="EN-US_TOPIC_0013771112__text1038617675911">ECS</span> by specifying its vCPUs, memory, OS, and login mode. After an <span id="EN-US_TOPIC_0013771112__text255114101595">ECS</span> is created, you can modify its specifications if necessary. ECS works with other services to provide a reliable, secure, efficient computing environment.</p>
<div id="body55752527"><p id="EN-US_TOPIC_0013771112__p024184315493">An Elastic Cloud Server (ECS) is a basic computing unit that consists of vCPUs, memory, OS, and Elastic Volume Service (EVS) disks.</p>
<p id="EN-US_TOPIC_0013771112__p47101664518">You can create an <span id="EN-US_TOPIC_0013771112__text1038617675911">ECS</span> by specifying its vCPUs, memory, OS, and login mode. After creating an ECS, you can use it on the cloud like using your local PC or physical server. You can also modify its specifications if necessary. ECS lets your applications run in a reliable, secure, efficient computing environment.</p>
<ul id="EN-US_TOPIC_0013771112__ul5683122783111"><li id="EN-US_TOPIC_0013771112__li1168311276318">For details about the operating systems supported by ECS, see <a href="en-us_topic_0030828254.html">Image Types</a>.</li><li id="EN-US_TOPIC_0013771112__li1868312710319">For details about the login authentication mode, see <a href="en-us_topic_0092494193.html">Logging In to an ECS</a>.</li></ul>
<div class="section" id="EN-US_TOPIC_0013771112__section25920740113331"><h4 class="sectiontitle">System Architecture</h4><p id="EN-US_TOPIC_0013771112__p36030326113343"><span id="EN-US_TOPIC_0013771112__text1071310409595">ECS</span> works with other products and services to provide computing, storage, and network resources. You can quickly migrate and replicate existing ECSs using images.</p>
<ul id="EN-US_TOPIC_0013771112__ul39646801113416"><li id="EN-US_TOPIC_0013771112__li49170428113458"><span id="EN-US_TOPIC_0013771112__text2515225144312">ECS</span>s can be deployed in multiple availability zones (AZs) connected with each other through an internal network. If one AZ becomes faulty, other AZs in the same region will not be affected.</li><li id="EN-US_TOPIC_0013771112__li49614826113518">With the Virtual Private Cloud (VPC) service, you can build your own dedicated network on the cloud. You can also set subnets and security groups within your VPC for further isolation. You can allow your VPC to communicate with the external network through an <span id="EN-US_TOPIC_0013771112__text9714352173411">EIP</span> (bandwidth support required).</li><li id="EN-US_TOPIC_0013771112__li860244113533">With the Image Management Service (IMS), you can use an image to create <span id="EN-US_TOPIC_0013771112__text154203210180">ECS</span>s. Alternatively, you can use an existing <span id="EN-US_TOPIC_0013771112__text145585117201">ECS</span> to create a private image and use the private image to create the same <span id="EN-US_TOPIC_0013771112__text2031834014312">ECS</span>s for rapid service deployment.</li><li id="EN-US_TOPIC_0013771112__li45571980113416">Elastic Volume Service (EVS) provides storage space and Volume Backup Service (VBS) provides data backup and restoration functions.</li><li id="EN-US_TOPIC_0013771112__li115141636122018">Cloud Eye lets you keep a close eye on the performance and resource utilization of <span id="EN-US_TOPIC_0013771112__text562624654314">ECS</span>s, ensuring <span id="EN-US_TOPIC_0013771112__text7334938142515">ECS</span> reliability and availability.</li><li id="EN-US_TOPIC_0013771112__li179651546225">Volume Backup Service (VBS) allows you to create data backups for EVS disks and use the backups to restore the EVS disks. This maximizes user data correctness and security.</li><li id="EN-US_TOPIC_0013771112__li42327332278">Cloud Server Backup Service (CSBS) backs up all EVS disks of an ECS, including the system disk and data disks, and uses the backup to restore the ECS.</li></ul>
<div class="section" id="EN-US_TOPIC_0013771112__section25920740113331"><h4 class="sectiontitle">System Architecture</h4><p id="EN-US_TOPIC_0013771112__p36030326113343"><span id="EN-US_TOPIC_0013771112__text1071310409595">ECS</span> works with other products and services to provide compute, storage, and network resources.</p>
<ul id="EN-US_TOPIC_0013771112__ul39646801113416"><li id="EN-US_TOPIC_0013771112__li49170428113458">You can deploy <span id="EN-US_TOPIC_0013771112__text2515225144312">ECS</span>s across different availability zones (AZs) (AZs are connected with each other over an intranet). If one AZ becomes unavailable, ECSs in other AZs can continue to provide services.</li><li id="EN-US_TOPIC_0013771112__li49614826113518">With the Virtual Private Cloud (VPC) service, you can build your own dedicated network on the cloud. You can also set subnets and security groups within your VPC for further isolation. You can bind an EIP to connect your VPC to the Internet (bandwidth needs to be supported).</li><li id="EN-US_TOPIC_0013771112__li860244113533">With the Image Management Service (IMS), you can use an image to create <span id="EN-US_TOPIC_0013771112__text154203210180">ECS</span>s. Alternatively, you can use an existing <span id="EN-US_TOPIC_0013771112__text145585117201">ECS</span> to create a private image and use the private image to create the same <span id="EN-US_TOPIC_0013771112__text2031834014312">ECS</span>s for rapid service deployment.</li><li id="EN-US_TOPIC_0013771112__li45571980113416">Elastic Volume Service (EVS) provides storage space. Volume Backup Service (VBS) provides data backup and restoration.</li><li id="EN-US_TOPIC_0013771112__li115141636122018">Cloud Eye lets you keep a close eye on the performance and resource utilization of <span id="EN-US_TOPIC_0013771112__text562624654314">ECS</span>s, ensuring <span id="EN-US_TOPIC_0013771112__text7334938142515">ECS</span> reliability and availability.</li><li id="EN-US_TOPIC_0013771112__li179651546225">Volume Backup Service (VBS) allows you to create data backups for EVS disks and use the backups to restore the EVS disks. This maximizes user data correctness and security.</li><li id="EN-US_TOPIC_0013771112__li42327332278">Cloud Server Backup Service (CSBS) backs up all EVS disks of an ECS, including the system disk and data disks, and uses the backup to restore the ECS.</li></ul>
<div class="fignone" id="EN-US_TOPIC_0013771112__fig36062790113621"><span class="figcap"><b>Figure 1 </b>System architecture</span><br><span><img class="imgResize" id="EN-US_TOPIC_0013771112__image319962452815" src="en-us_image_0071898891.png" title="Click to enlarge"></span></div>
</div>
<div class="section" id="EN-US_TOPIC_0013771112__section4598730144410"><h4 class="sectiontitle">Access Methods</h4><div class="p" id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_p43867502165751">You can access ECS through the web-based management console or HTTPS-based application programming interfaces (APIs).<ul id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_ul59263200165751"><li id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_li63606753165751">Accessing ECSs through APIs<p id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_p35589866165751"><a name="EN-US_TOPIC_0013771112__en-us_topic_0029700409_li63606753165751"></a><a name="en-us_topic_0029700409_li63606753165751"></a>Use this method if you intend to integrate the ECSs on the cloud platform into a third-party system for secondary development. For details, see <em id="EN-US_TOPIC_0013771112__i842352697114113">Elastic Cloud Server API Reference</em>.</p>
<div class="section" id="EN-US_TOPIC_0013771112__section4598730144410"><h4 class="sectiontitle">Access Methods</h4><div class="p" id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_p43867502165751">You can access ECS through the web-based management console or HTTPS-based application programming interfaces (APIs).<ul id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_ul59263200165751"><li id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_li63606753165751">Accessing ECSs through APIs<p id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_p35589866165751"><a name="EN-US_TOPIC_0013771112__en-us_topic_0029700409_li63606753165751"></a><a name="en-us_topic_0029700409_li63606753165751"></a>Use this method if you intend to integrate the ECSs on the cloud platform into a third-party system for secondary development. For details, see <em id="EN-US_TOPIC_0013771112__i44171948199">Elastic Cloud Server API Reference</em>.</p>
</li><li id="EN-US_TOPIC_0013771112__en-us_topic_0029700409_li51873340165751">Accessing ECSs through the management console<p id="EN-US_TOPIC_0013771112__p19101516131917"><a name="EN-US_TOPIC_0013771112__en-us_topic_0029700409_li51873340165751"></a><a name="en-us_topic_0029700409_li51873340165751"></a>Use this method if you are not required to integrate ECSs with a third-party system.</p>
<p id="EN-US_TOPIC_0013771112__p125490200197">Log in to the management console with your account and choose <strong id="EN-US_TOPIC_0013771112__b1217254116130">Elastic Cloud Server</strong> on the homepage. </p>
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<div id="body1435883576187"><div class="section" id="EN-US_TOPIC_0017130261__section3759917014179"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0017130261__p2563394814179">After obtaining <span id="EN-US_TOPIC_0017130261__text95540359913">ECS</span>s, you can view and manage them on the management console. This section describes how to view detailed <span id="EN-US_TOPIC_0017130261__text128503371694">ECS</span> configurations, including its name, image, system disk, data disks, VPC, NIC, security group, and <span id="EN-US_TOPIC_0017130261__text1950318107244">EIP</span>.</p>
<p id="EN-US_TOPIC_0017130261__p1177410251818">To view the private IP address of an <span id="EN-US_TOPIC_0017130261__text732212402912">ECS</span>, view it on the <strong id="EN-US_TOPIC_0017130261__b143545713161">Elastic Cloud Server</strong> page.</p>
</div>
<div class="section" id="EN-US_TOPIC_0017130261__section2937894314179"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0017130261__ol3088417414179"><li id="EN-US_TOPIC_0017130261__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0017130261__li464234814566">Click <span><img id="EN-US_TOPIC_0017130261__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0017130261__li1859019014179">Under <strong id="EN-US_TOPIC_0017130261__b8330141310221"><span id="EN-US_TOPIC_0017130261__text1433051312215">Computing</span></strong>, click <strong id="EN-US_TOPIC_0017130261__b1033001312223">Elastic Cloud Server</strong>.<p id="EN-US_TOPIC_0017130261__p28383428216">The <strong id="EN-US_TOPIC_0017130261__b85561016131711">Elastic Cloud Server</strong> page is displayed. On this page, you can view your <span id="EN-US_TOPIC_0017130261__text11024513916">ECS</span>s and the basic information about the <span id="EN-US_TOPIC_0017130261__text1330252917175">ECS</span>s, such as their private IP addresses.</p>
<div class="section" id="EN-US_TOPIC_0017130261__section2937894314179"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0017130261__ol3088417414179"><li id="EN-US_TOPIC_0017130261__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0017130261__li464234814566">Click <span><img id="EN-US_TOPIC_0017130261__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0017130261__li1859019014179">Under <strong id="EN-US_TOPIC_0017130261__b570749124618"><span id="EN-US_TOPIC_0017130261__text13701249174612">Computing</span></strong>, click <strong id="EN-US_TOPIC_0017130261__b370549114615">Elastic Cloud Server</strong>.<p id="EN-US_TOPIC_0017130261__p28383428216">The <strong id="EN-US_TOPIC_0017130261__b85561016131711">Elastic Cloud Server</strong> page is displayed. On this page, you can view your <span id="EN-US_TOPIC_0017130261__text11024513916">ECS</span>s and the basic information about the <span id="EN-US_TOPIC_0017130261__text1330252917175">ECS</span>s, such as their private IP addresses.</p>
</li><li id="EN-US_TOPIC_0017130261__li5741957114179">In the search box above the <span id="EN-US_TOPIC_0017130261__text16466347993">ECS</span> list, enter the <span id="EN-US_TOPIC_0017130261__text8946165115172">ECS</span> name, IP address, or ID, and click <span><img id="EN-US_TOPIC_0017130261__image13405105333511" src="en-us_image_0128851621.png"></span> for search. Alternatively, click <strong id="EN-US_TOPIC_0017130261__b4944133418426">Search by Tag</strong> above the upper right corner of the ECS list and search for an ECS by tag key and value.</li><li id="EN-US_TOPIC_0017130261__li1472787014179">Click the name of the target <span id="EN-US_TOPIC_0017130261__text83910499918">ECS</span>.<p id="EN-US_TOPIC_0017130261__p216070221280">The page providing details about the <span id="EN-US_TOPIC_0017130261__text0939849496">ECS</span> is displayed.</p>
</li><li id="EN-US_TOPIC_0017130261__li5210683614179">View the <span id="EN-US_TOPIC_0017130261__text17922750899">ECS</span> details.<p id="EN-US_TOPIC_0017130261__p4939654514179">You can modify <span id="EN-US_TOPIC_0017130261__text153151152693">ECS</span> configurations, for example, change its security group, add a NIC or tag to it, or bind an <span id="EN-US_TOPIC_0017130261__text13811637134719">EIP</span> to it, by clicking corresponding links or buttons.</p>
</li></ol>

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<a name="EN-US_TOPIC_0017955380"></a><a name="EN-US_TOPIC_0017955380"></a>
<h1 class="topictitle1">Login Using an SSH Key</h1>
<div id="body1437210781593"><div class="section" id="EN-US_TOPIC_0017955380__section1547194115913"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0017955380__p112185456913">This section describes how to remotely log in to a Linux ECS using an SSH key pair from a Windows and a Linux server, respectively.</p>
<div id="body1437210781593"><div class="section" id="EN-US_TOPIC_0017955380__section1547194115913"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0017955380__p112185456913">This section describes how to use an SSH key pair to remotely log in to a Linux ECS from a Windows and a Linux server, respectively.</p>
</div>
<div class="section" id="EN-US_TOPIC_0017955380__section6801971111724"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0017955380__ul14088797111724"><li id="EN-US_TOPIC_0017955380__li8057630204858">You have obtained the private key file used for creating the ECS. For details about how to create a key pair, see <a href="en-us_topic_0000001278350057.html">(Recommended) Creating a Key Pair on the Management Console</a>.</li><li id="EN-US_TOPIC_0017955380__li59690312111724">You have bound an <span id="EN-US_TOPIC_0017955380__text1281813161820">EIP</span> to the <span id="EN-US_TOPIC_0017955380__text1881818161127">ECS</span>. For details, see <a href="en-us_topic_0017130261.html">Viewing Details About an ECS</a>.</li></ul>
</div>
<ul id="EN-US_TOPIC_0017955380__ul341899111724"><li id="EN-US_TOPIC_0017955380__li3077095111724">You have configured the inbound rules of the security group. For details, see <a href="en-us_topic_0030878383.html">Configuring Security Group Rules</a>.</li><li id="EN-US_TOPIC_0017955380__li23377058164348">The network connection between the login tool (PuTTY) and the target <span id="EN-US_TOPIC_0017955380__text912922101412">ECS</span> is normal. For example, the default port 22 is not blocked by the firewall.</li></ul>
<div class="section" id="EN-US_TOPIC_0017955380__section47918167111724"><a name="EN-US_TOPIC_0017955380__section47918167111724"></a><a name="section47918167111724"></a><h4 class="sectiontitle">Logging In to the Linux ECS from Local Windows Server</h4><p id="EN-US_TOPIC_0017955380__p56166336111724">To log in to the Linux <span id="EN-US_TOPIC_0017955380__text9196132313143">ECS</span> from local Windows, perform the operations described in this section.</p>
<div class="section" id="EN-US_TOPIC_0017955380__section47918167111724"><a name="EN-US_TOPIC_0017955380__section47918167111724"></a><a name="section47918167111724"></a><h4 class="sectiontitle">Logging In to a Linux ECS from a Local Windows Server</h4><p id="EN-US_TOPIC_0017955380__p56166336111724">You have two methods to log in to a Linux <span id="EN-US_TOPIC_0017955380__text9196132313143">ECS</span> from a local Windows server.</p>
<p id="EN-US_TOPIC_0017955380__p49673096204924"><strong id="EN-US_TOPIC_0017955380__b842352706101120">Method 1: Use PuTTY to log in to the ECS.</strong></p>
<div class="p" id="EN-US_TOPIC_0017955380__p3507989320731">The following operations use PuTTY as an example. Before logging in to the <span id="EN-US_TOPIC_0017955380__text358192610140">ECS</span> using PuTTY, make sure that the private key file has been converted to .ppk format.<ol id="EN-US_TOPIC_0017955380__ol53179337111724"><li id="EN-US_TOPIC_0017955380__li5774252720735">Check whether the private key file has been converted to .ppk format.<ul id="EN-US_TOPIC_0017955380__ul3906000820958"><li id="EN-US_TOPIC_0017955380__li1599575920958">If yes, go to step <a href="#EN-US_TOPIC_0017955380__li40879966111724">7</a>.</li><li id="EN-US_TOPIC_0017955380__li5850240020107">If no, go to step <a href="#EN-US_TOPIC_0017955380__li8851985111724">2</a>.</li></ul>
<div class="p" id="EN-US_TOPIC_0017955380__p3507989320731">The following operations use PuTTY as an example. Before using PuTTY to log in, make sure that the private key file has been converted to .ppk format.<ol id="EN-US_TOPIC_0017955380__ol53179337111724"><li id="EN-US_TOPIC_0017955380__li5774252720735">Check whether the private key file has been converted to .ppk format.<ul id="EN-US_TOPIC_0017955380__ul3906000820958"><li id="EN-US_TOPIC_0017955380__li1599575920958">If yes, go to step <a href="#EN-US_TOPIC_0017955380__li40879966111724">7</a>.</li><li id="EN-US_TOPIC_0017955380__li5850240020107">If no, go to step <a href="#EN-US_TOPIC_0017955380__li8851985111724">2</a>.</li></ul>
</li><li id="EN-US_TOPIC_0017955380__li8851985111724"><a name="EN-US_TOPIC_0017955380__li8851985111724"></a><a name="li8851985111724"></a>Visit the following website and download PuTTY and PuTTYgen:<p id="EN-US_TOPIC_0017955380__p12559002111724"><a name="EN-US_TOPIC_0017955380__li8851985111724"></a><a name="li8851985111724"></a><a href="https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html" target="_blank" rel="noopener noreferrer">https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html</a></p>
<div class="note" id="EN-US_TOPIC_0017955380__note45922157111724"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0017955380__p10646236111724">PuTTYgen is a key generator, which is used to create a key pair that consists of a public key and a private key for PuTTY.</p>
</div></div>
</li><li id="EN-US_TOPIC_0017955380__li28707262111724">Run PuTTYgen.</li><li id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_li57038774111724">In the <span class="uicontrol" id="EN-US_TOPIC_0017955380__uicontrol5606020615468"><b>Actions</b></span> pane, click <span class="uicontrol" id="EN-US_TOPIC_0017955380__uicontrol49150490154634"><b>Load</b></span> and import the private key file that you stored during <span id="EN-US_TOPIC_0017955380__text85971227101419">ECS</span> creation.<p id="EN-US_TOPIC_0017955380__p30529907154714">Ensure that the format of <span class="parmvalue" id="EN-US_TOPIC_0017955380__parmvalue155511305120301"><b>All files (*.*)</b></span> is selected.</p>
</li><li id="EN-US_TOPIC_0017955380__li43586924111724">Click <strong id="EN-US_TOPIC_0017955380__b26056377132">Save private key</strong>.</li><li id="EN-US_TOPIC_0017955380__li56738001111724"><a name="EN-US_TOPIC_0017955380__li56738001111724"></a><a name="li56738001111724"></a>Save the converted private key, for example, <strong id="EN-US_TOPIC_0017955380__b2606737101317">kp-123.ppk</strong>, to the local computer.</li><li id="EN-US_TOPIC_0017955380__li40879966111724"><a name="EN-US_TOPIC_0017955380__li40879966111724"></a><a name="li40879966111724"></a>Double-click <strong id="EN-US_TOPIC_0017955380__b842352706195943">PUTTY.EXE</strong>. The <strong id="EN-US_TOPIC_0017955380__b842352706195959">PuTTY Configuration</strong> page is displayed.</li><li id="EN-US_TOPIC_0017955380__li706469820233">Choose <strong id="EN-US_TOPIC_0017955380__b06321172620">Session</strong> and enter the <span id="EN-US_TOPIC_0017955380__text1249381314488">EIP</span> of the <span id="EN-US_TOPIC_0017955380__text1364564614141">ECS</span> under <strong id="EN-US_TOPIC_0017955380__b85302261565">Host Name (or IP address)</strong>.<div class="fignone" id="EN-US_TOPIC_0017955380__fig3739272820239"><span class="figcap"><b>Figure 1 </b>Configuring the <span id="EN-US_TOPIC_0017955380__text18667151454813">EIP</span></span><br><span><img id="EN-US_TOPIC_0017955380__image4549210120228" src="en-us_image_0000001082643605.jpg" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="EN-US_TOPIC_0017955380__li26002391163516">Choose <strong id="EN-US_TOPIC_0017955380__b842352706164122">Connection</strong> &gt; <strong id="EN-US_TOPIC_0017955380__b842352706164125">Data</strong>. Enter the image username in <strong id="EN-US_TOPIC_0017955380__b842352706164253">Auto-login username</strong>.<div class="note" id="EN-US_TOPIC_0017955380__note289224152455"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0017955380__ul20706144145520"><li id="EN-US_TOPIC_0017955380__li3706349551">If a public image is used, see <em id="EN-US_TOPIC_0017955380__i1266614172017"><a href="https://docs.otc.t-systems.com/en-us/ims/index.html" target="_blank" rel="noopener noreferrer">Public Images Introduction</a></em> for the image username.</li><li id="EN-US_TOPIC_0017955380__li13706164145511">If a private image is used, use the username of the private image.</li></ul>
</li><li id="EN-US_TOPIC_0017955380__li26002391163516">Choose <strong id="EN-US_TOPIC_0017955380__b842352706164122">Connection</strong> &gt; <strong id="EN-US_TOPIC_0017955380__b842352706164125">Data</strong>. Enter the image username in <strong id="EN-US_TOPIC_0017955380__b842352706164253">Auto-login username</strong>.<div class="note" id="EN-US_TOPIC_0017955380__note289224152455"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0017955380__ul20706144145520"><li id="EN-US_TOPIC_0017955380__li3706349551">If a public image is used, see <em id="EN-US_TOPIC_0017955380__i1266614172017"><a href="https://docs.otc.t-systems.com/image-management-service/public-images/" target="_blank" rel="noopener noreferrer">Public Images Introduction</a></em> for the image username.</li><li id="EN-US_TOPIC_0017955380__li13706164145511">If a private image is used, use the username of the private image.</li></ul>
</div></div>
</li><li id="EN-US_TOPIC_0017955380__li22942973111724">Choose <strong id="EN-US_TOPIC_0017955380__b1761383791316">Connection</strong> &gt; <strong id="EN-US_TOPIC_0017955380__b361318376135">SSH</strong> &gt; <strong id="EN-US_TOPIC_0017955380__b86131237101318">Auth</strong>. In the last configuration item <strong id="EN-US_TOPIC_0017955380__b1361373710133">Private key file for authentication</strong>, click <strong id="EN-US_TOPIC_0017955380__b06131837181320">Browse</strong> and select the private key converted in step <a href="#EN-US_TOPIC_0017955380__li56738001111724">6</a>.</li><li id="EN-US_TOPIC_0017955380__li46441520111724">Click <strong id="EN-US_TOPIC_0017955380__b1761683712136">Open</strong>.<p id="EN-US_TOPIC_0017955380__p15320501111724">Log in to the <span id="EN-US_TOPIC_0017955380__text27241101274">ECS</span>.</p>
</li></ol>
</li><li id="EN-US_TOPIC_0017955380__li22942973111724">Choose <strong id="EN-US_TOPIC_0017955380__b1761383791316">Connection</strong> &gt; <strong id="EN-US_TOPIC_0017955380__b361318376135">SSH</strong> &gt; <strong id="EN-US_TOPIC_0017955380__b86131237101318">Auth</strong>. In the last configuration item <strong id="EN-US_TOPIC_0017955380__b1361373710133">Private key file for authentication</strong>, click <strong id="EN-US_TOPIC_0017955380__b06131837181320">Browse</strong> and select the private key converted in step <a href="#EN-US_TOPIC_0017955380__li56738001111724">6</a>.</li><li id="EN-US_TOPIC_0017955380__li46441520111724">Click <strong id="EN-US_TOPIC_0017955380__b1761683712136">Open</strong> to log in to the <span id="EN-US_TOPIC_0017955380__text27241101274">ECS</span>.</li></ol>
</div>
<p id="EN-US_TOPIC_0017955380__p59947944205032"><strong id="EN-US_TOPIC_0017955380__b842352706102336">Method 2: Use Xshell to log in to the ECS.</strong></p>
<ol id="EN-US_TOPIC_0017955380__ol54723507205051"><li id="EN-US_TOPIC_0017955380__li58876908205051">Start the Xshell tool.</li><li id="EN-US_TOPIC_0017955380__li4831310620510">Run the following command using the <span id="EN-US_TOPIC_0017955380__text426816163483">EIP</span> to remotely log in to the <span id="EN-US_TOPIC_0017955380__text19680144951417">ECS</span> through SSH:<p id="EN-US_TOPIC_0017955380__p29511049205142"><strong id="EN-US_TOPIC_0017955380__b1329075119127">ssh</strong> <em id="EN-US_TOPIC_0017955380__i43747441164643"><strong id="EN-US_TOPIC_0017955380__b66820451164643">Username</strong></em><strong id="EN-US_TOPIC_0017955380__b53881836164643">@<em id="EN-US_TOPIC_0017955380__i113013262529"><span id="EN-US_TOPIC_0017955380__text0607191575217">EIP</span></em></strong></p>
<div class="note" id="EN-US_TOPIC_0017955380__note833517545353"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_ul20706144145520"><li id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_li3706349551">If a public image is used, see <em id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_i1266614172017"><a href="https://docs.otc.t-systems.com/en-us/ims/index.html" target="_blank" rel="noopener noreferrer">Public Images Introduction</a></em> for the image username.</li><li id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_li13706164145511">If a private image is used, use the username of the private image.</li></ul>
<div class="note" id="EN-US_TOPIC_0017955380__note833517545353"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_ul20706144145520"><li id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_li3706349551">If a public image is used, see <em id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_i1266614172017"><a href="https://docs.otc.t-systems.com/image-management-service/public-images/" target="_blank" rel="noopener noreferrer">Public Images Introduction</a></em> for the image username.</li><li id="EN-US_TOPIC_0017955380__en-us_topic_0017955380_li13706164145511">If a private image is used, use the username of the private image.</li></ul>
</div></div>
</li><li id="EN-US_TOPIC_0017955380__li65527645205310">(Optional) If the system displays the <strong id="EN-US_TOPIC_0017955380__b842352706103315">SSH Security Warning</strong> dialog box, click <strong id="EN-US_TOPIC_0017955380__b842352706103435">Accept &amp; Save</strong>.<div class="fignone" id="EN-US_TOPIC_0017955380__fig680319562495"><span class="figcap"><b>Figure 2 </b>SSH Security Warning</span><br><span><img id="EN-US_TOPIC_0017955380__image18772506254" src="en-us_image_0178475901.png"></span></div>
</li><li id="EN-US_TOPIC_0017955380__li56881900205338">Select <strong id="EN-US_TOPIC_0017955380__b842352706103545">Public Key</strong> and click <strong id="EN-US_TOPIC_0017955380__b84235270610371">Browse</strong> beside the user key text box.</li><li id="EN-US_TOPIC_0017955380__li10975823205436">In the user key dialog box, click <strong id="EN-US_TOPIC_0017955380__b842352706103758">Import</strong>.</li><li id="EN-US_TOPIC_0017955380__li612943622102">Select the locally stored key file and click <strong id="EN-US_TOPIC_0017955380__b842352706103847">Open</strong>.</li><li id="EN-US_TOPIC_0017955380__li26892298205533">Click <strong id="EN-US_TOPIC_0017955380__b1384755286">OK</strong> to log in to the <span id="EN-US_TOPIC_0017955380__text777655001419">ECS</span>.</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0017955380__section3666784111724"><a name="EN-US_TOPIC_0017955380__section3666784111724"></a><a name="section3666784111724"></a><h4 class="sectiontitle">Logging In to the Linux ECS from Local Linux Server</h4><div class="p" id="EN-US_TOPIC_0017955380__p28574068111724">To log in to the Linux <span id="EN-US_TOPIC_0017955380__text0729145251416">ECS</span> from local Linux, perform the operations described in this section. The following operations use private key file <strong id="EN-US_TOPIC_0017955380__b184804218611">kp-123.pem</strong> as an example to log in to the ECS. The name of your private key file may differ.<ol id="EN-US_TOPIC_0017955380__ol55840023111724"><li id="EN-US_TOPIC_0017955380__li32798165111724">On the Linux CLI, run the following command to change operation permissions:<p id="EN-US_TOPIC_0017955380__p26748029111724"><a name="EN-US_TOPIC_0017955380__li32798165111724"></a><a name="li32798165111724"></a><strong id="EN-US_TOPIC_0017955380__b141829542515418">chmod 400 /</strong><em id="EN-US_TOPIC_0017955380__i119870989715418">path</em><strong id="EN-US_TOPIC_0017955380__b182456313515424">/kp-123</strong><strong id="EN-US_TOPIC_0017955380__b1356401439193047">.pem</strong></p>
<div class="note" id="EN-US_TOPIC_0017955380__note19106747111724"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0017955380__p37743003111724">In the preceding command, <em id="EN-US_TOPIC_0017955380__i1681691002125432">path</em> refers to the path where the key file is saved.</p>
<div class="section" id="EN-US_TOPIC_0017955380__section3666784111724"><a name="EN-US_TOPIC_0017955380__section3666784111724"></a><a name="section3666784111724"></a><h4 class="sectiontitle">Logging In to a Linux ECS from a Local Linux Server</h4><div class="p" id="EN-US_TOPIC_0017955380__p28574068111724">To log in to the Linux <span id="EN-US_TOPIC_0017955380__text0729145251416">ECS</span> from local Linux, perform the operations described in this section. The following operations use private key file <strong id="EN-US_TOPIC_0017955380__b184804218611">kp-123.pem</strong> as an example to log in to the ECS. The name of your private key file may differ.<ol id="EN-US_TOPIC_0017955380__ol55840023111724"><li id="EN-US_TOPIC_0017955380__li32798165111724">On the Linux CLI, run the following command to change operation permissions:<p id="EN-US_TOPIC_0017955380__p26748029111724"><a name="EN-US_TOPIC_0017955380__li32798165111724"></a><a name="li32798165111724"></a><strong id="EN-US_TOPIC_0017955380__b141829542515418">chmod 400 /</strong><em id="EN-US_TOPIC_0017955380__i119870989715418">path</em><strong id="EN-US_TOPIC_0017955380__b182456313515424">/kp-123</strong><strong id="EN-US_TOPIC_0017955380__b1356401439193047">.pem</strong></p>
<div class="note" id="EN-US_TOPIC_0017955380__note19106747111724"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0017955380__p37743003111724">In the preceding command, replace <em id="EN-US_TOPIC_0017955380__i1681691002125432">path</em> with the actual path where the key file is saved.</p>
</div></div>
</li><li id="EN-US_TOPIC_0017955380__li4142714111724">Run the following command to log in to the <span id="EN-US_TOPIC_0017955380__text1087825831416">ECS</span>:<p id="EN-US_TOPIC_0017955380__p51016140103357"><strong id="EN-US_TOPIC_0017955380__b8935174191314">ssh -i /<em id="EN-US_TOPIC_0017955380__i393524161316">path</em>/kp-123.pem</strong> <em id="EN-US_TOPIC_0017955380__i17658378151627"><strong id="EN-US_TOPIC_0017955380__b46701284151627">Default username</strong></em><strong id="EN-US_TOPIC_0017955380__b7166428201240">@</strong><em id="EN-US_TOPIC_0017955380__i1779413984815"><strong id="EN-US_TOPIC_0017955380__b1951939114818"><span id="EN-US_TOPIC_0017955380__text14536992112">EIP</span></strong></em></p>
<p id="EN-US_TOPIC_0017955380__p34995982103441">For example, if the default username is <strong id="EN-US_TOPIC_0017955380__b1377156563">root</strong> and the <span id="EN-US_TOPIC_0017955380__text1187502510482">EIP</span> is <strong id="EN-US_TOPIC_0017955380__b18875984107">123.123.123.123</strong>, run the following command:</p>

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<h1 class="topictitle1">Login Using MSTSC</h1>
<div id="body1437210781594"><div class="section" id="EN-US_TOPIC_0017955381__section119451029135512"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0017955381__p2051937011921">This section describes how to use the remote login tool MSTSC to log in to a Windows <span id="EN-US_TOPIC_0017955381__text1360192010129">ECS</span> from a local computer.</p>
</div>
<div class="section" id="EN-US_TOPIC_0017955381__section30111449112059"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0017955381__ul23108310112059"><li id="EN-US_TOPIC_0017955381__li18354497116">The target <span id="EN-US_TOPIC_0017955381__text1740721175119">ECS</span> is running.</li><li id="EN-US_TOPIC_0017955381__li21744107205119">You have obtained the password for logging in to the Windows ECS. For details, see <a href="en-us_topic_0031107266.html">Obtaining the Password for Logging In to a Windows ECS</a>.</li><li id="EN-US_TOPIC_0017955381__li6648204112059">You have bound an <span id="EN-US_TOPIC_0017955381__text943714445512">EIP</span> to the <span id="EN-US_TOPIC_0017955381__text114381544185112">ECS</span>. For details, see <a href="en-us_topic_0174917535.html">Binding an EIP</a>.</li></ul>
<ul id="EN-US_TOPIC_0017955381__ul59833840112059"><li id="EN-US_TOPIC_0017955381__li1633651112059">Access to port 3389 is allowed in the inbound direction of the security group to which the ECS belongs. For details, see <a href="en-us_topic_0030878383.html">Configuring Security Group Rules</a>.</li><li id="EN-US_TOPIC_0017955381__li39291782164659">The network connection between the login tool and the target <span id="EN-US_TOPIC_0017955381__text1162262525210">ECS</span> is normal. For example, the default port 3389 is not blocked by the firewall.</li><li id="EN-US_TOPIC_0017955381__li1180914813562">RDP has been enabled on the target <span id="EN-US_TOPIC_0017955381__text16646742165210">ECS</span>. By default, RDP has been enabled on the <span id="EN-US_TOPIC_0017955381__text5312114445215">ECS</span>s created using a public image. For instructions about how to enable RDP, see <a href="#EN-US_TOPIC_0017955381__section65216898112059">Enabling RDP</a>.</li></ul>
<div class="section" id="EN-US_TOPIC_0017955381__section30111449112059"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0017955381__ul23108310112059"><li id="EN-US_TOPIC_0017955381__li18354497116">The target <span id="EN-US_TOPIC_0017955381__text1740721175119">ECS</span> is running.</li><li id="EN-US_TOPIC_0017955381__li21744107205119">You have obtained the password for logging in to the Windows ECS. For details, see <a href="en-us_topic_0031107266.html">Obtaining the Password for Logging In to a Windows ECS</a>.</li><li id="EN-US_TOPIC_0017955381__li6648204112059">You have bound an <span id="EN-US_TOPIC_0017955381__text1210791184912">EIP</span> to the <span id="EN-US_TOPIC_0017955381__text510801111498">ECS</span>. For details, see <a href="en-us_topic_0174917535.html">Binding an EIP</a>.</li></ul>
<ul id="EN-US_TOPIC_0017955381__ul59833840112059"><li id="EN-US_TOPIC_0017955381__li1633651112059">Access to port 3389 is allowed in the inbound direction of the security group to which the ECS belongs. For details, see <a href="en-us_topic_0030878383.html">Configuring Security Group Rules</a>.</li><li id="EN-US_TOPIC_0017955381__li39291782164659">The network connection between the login tool and the target <span id="EN-US_TOPIC_0017955381__text1162262525210">ECS</span> is normal. For example, the default port 3389 is not blocked by the firewall.</li><li id="EN-US_TOPIC_0017955381__li1180914813562">Remote Desktop Protocol (RDP) needs to be enabled on the target <span id="EN-US_TOPIC_0017955381__text16646742165210">ECS</span>. For <span id="EN-US_TOPIC_0017955381__text5312114445215">ECS</span>s created using public images, RDP has been enabled by default. For instructions about how to enable RDP, see <a href="#EN-US_TOPIC_0017955381__section65216898112059">Enabling RDP</a>.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0017955381__section1011913410314"><h4 class="sectiontitle">Logging In to a Windows ECS Using MSTSC</h4><p id="EN-US_TOPIC_0017955381__p16299256133">If your local server runs Windows, you can use the remote desktop connection tool MSTSC delivered with the Windows OS to log in to a Windows <span id="EN-US_TOPIC_0017955381__text12183161512">ECS</span>.</p>
<ol id="EN-US_TOPIC_0017955381__ol8411414453"><li id="EN-US_TOPIC_0017955381__li1341101415517">Click the start menu on the local server.</li><li id="EN-US_TOPIC_0017955381__li11411121415519">In the <strong id="EN-US_TOPIC_0017955381__b84235270694226">Search programs and files</strong> text box, enter <strong id="EN-US_TOPIC_0017955381__b84235270694448">mstsc</strong>.</li><li id="EN-US_TOPIC_0017955381__li171035522613">In the <strong id="EN-US_TOPIC_0017955381__b84235270694543">Remote Desktop Connection</strong> dialog box, click <strong id="EN-US_TOPIC_0017955381__b8423527069463">Show Options</strong>.<div class="fignone" id="EN-US_TOPIC_0017955381__en-us_topic_0027290684_fig22996848191913"><span class="figcap"><b>Figure 1 </b>Show Options</span><br><span><img id="EN-US_TOPIC_0017955381__image1150418145412" src="en-us_image_0295941039.png" title="Click to enlarge" class="imgResize"></span></div>
@ -16,16 +16,16 @@
<div class="p" id="EN-US_TOPIC_0017955381__p8334104475810">To copy files from the local server to your ECS, click <strong id="EN-US_TOPIC_0017955381__b5774113314167">More</strong> and select your desired disks.<div class="fignone" id="EN-US_TOPIC_0017955381__fig2016145215213"><span class="figcap"><b>Figure 4 </b>Drives</span><br><span><img id="EN-US_TOPIC_0017955381__image1710017512568" src="en-us_image_0295940977.png" title="Click to enlarge" class="imgResize"></span></div>
</div>
</li><li id="EN-US_TOPIC_0017955381__li12495123731414">(Optional) Click the <strong id="EN-US_TOPIC_0017955381__b842352706115448">Display</strong> tab and then adjust the size of the remote desktop.<div class="fignone" id="EN-US_TOPIC_0017955381__fig45767599405"><span class="figcap"><b>Figure 5 </b>Adjusting the size of the desktop</span><br><span><img id="EN-US_TOPIC_0017955381__image486195216567" src="en-us_image_0295940978.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="EN-US_TOPIC_0017955381__li20171183316190">Click <strong id="EN-US_TOPIC_0017955381__b842352706103243">OK</strong> and enter the login password as prompted to log in to the ECS.<p id="EN-US_TOPIC_0017955381__p2411121419511">To ensure system security, change the login password after you log in to the ECS for the first time.</p>
</li><li id="EN-US_TOPIC_0017955381__li20171183316190">Click <strong id="EN-US_TOPIC_0017955381__b842352706103243">Connect</strong> and enter the login password as prompted to log in to the ECS.<p id="EN-US_TOPIC_0017955381__p2411121419511">To ensure system security, change the login password after you log in to the ECS for the first time.</p>
</li><li id="EN-US_TOPIC_0017955381__li6120180220727">(Optional) After logging in to the ECS using RDP, handle the issue that local files larger than 2 GB cannot be copied to a remote Windows ECS.<p id="EN-US_TOPIC_0017955381__p5283113020729"><a name="EN-US_TOPIC_0017955381__li6120180220727"></a><a name="li6120180220727"></a>For details, see <a href="https://support.microsoft.com/en-us/help/2258090/copying-files-larger-than-2-gb-over-a-remote-desktop-services-or-termi" target="_blank" rel="noopener noreferrer">troubleshooting cases</a>.</p>
</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0017955381__section65216898112059"><a name="EN-US_TOPIC_0017955381__section65216898112059"></a><a name="section65216898112059"></a><h4 class="sectiontitle">Enabling RDP</h4><div class="p" id="EN-US_TOPIC_0017955381__p48077410112059">When you log in to an <span id="EN-US_TOPIC_0017955381__text2434113501216">ECS</span> for the first time, log in to it using VNC, enable RDP, and access the <span id="EN-US_TOPIC_0017955381__text289711014567">ECS</span> using MSTSC.<div class="note" id="EN-US_TOPIC_0017955381__note5638113513711"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0017955381__p1527414171983">By default, RDP has been enabled on the ECSs created using a public image.</p>
<div class="section" id="EN-US_TOPIC_0017955381__section65216898112059"><a name="EN-US_TOPIC_0017955381__section65216898112059"></a><a name="section65216898112059"></a><h4 class="sectiontitle">Enabling RDP</h4><div class="p" id="EN-US_TOPIC_0017955381__p48077410112059">For your first login, use VNC to log in and enable RDP for your ECS. Then, use MSTSC to log in.<div class="note" id="EN-US_TOPIC_0017955381__note5638113513711"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0017955381__p1527414171983">By default, RDP has been enabled on the ECSs created using a public image.</p>
</div></div>
<ol id="EN-US_TOPIC_0017955381__ol32949349111118"><li id="EN-US_TOPIC_0017955381__li56723037111118">Log in to the Windows <span id="EN-US_TOPIC_0017955381__text34341437111211">ECS</span> using VNC.<p id="EN-US_TOPIC_0017955381__p2050535911424">For details, see <a href="en-us_topic_0027268511.html">Login Using VNC</a>.</p>
</li><li id="EN-US_TOPIC_0017955381__li27377399113414">Click <strong id="EN-US_TOPIC_0017955381__b842352706141917">Start</strong> in the task bar and choose <strong id="EN-US_TOPIC_0017955381__b84235270614388">Control Panel</strong> &gt; <strong id="EN-US_TOPIC_0017955381__b842352706143812">System and Security</strong> &gt; <strong id="EN-US_TOPIC_0017955381__b842352706143816">System</strong> &gt; <strong id="EN-US_TOPIC_0017955381__b842352706143824">Remote settings</strong>.<p id="EN-US_TOPIC_0017955381__p12062548113415">The <strong id="EN-US_TOPIC_0017955381__b842352706144010">System Properties</strong> dialog box is displayed.</p>
<div class="fignone" id="EN-US_TOPIC_0017955381__fig276023113838"><span class="figcap"><b>Figure 6 </b>System Properties</span><br><span><img id="EN-US_TOPIC_0017955381__image22357863113838" src="en-us_image_0049287308.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="EN-US_TOPIC_0017955381__li23748224113443">Click the <strong id="EN-US_TOPIC_0017955381__b842352706144047">Remote</strong> tab and select <strong id="EN-US_TOPIC_0017955381__b842352706144218">Allow remote connections to this computer</strong>.</li><li id="EN-US_TOPIC_0017955381__li34570216113530">Click <strong>OK</strong>.</li></ol>
</li><li id="EN-US_TOPIC_0017955381__li23748224113443">Click the <strong id="EN-US_TOPIC_0017955381__b842352706144047">Remote</strong> tab and select <strong id="EN-US_TOPIC_0017955381__b842352706144218">Allow remote connections to this computer</strong>.</li><li id="EN-US_TOPIC_0017955381__li34570216113530">Click <strong id="EN-US_TOPIC_0017955381__b196862515418">OK</strong>.</li></ol>
</div>
</div>
</div>

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<div class="notice" id="EN-US_TOPIC_0017955633__note411052861612"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0017955633__p3007142694710">Logging in to a Linux ECS using SSH password authentication is disabled by default. If you require password authentication, configure it after logging in to the ECS. To ensure system security, reset the common user password for logging in to the Linux ECS after configuring SSH password authentication.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0017955633__section58260650112020"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0017955633__ul21492248112020"><li id="EN-US_TOPIC_0017955633__li1586644205812">The target <span id="EN-US_TOPIC_0017955633__text69091938182114">ECS</span> is running.</li><li id="EN-US_TOPIC_0017955633__li59212509112020">You have bound an <span id="EN-US_TOPIC_0017955633__text1391705314108">EIP</span> to the <span id="EN-US_TOPIC_0017955633__text8923853161019">ECS</span>. For details, see <a href="en-us_topic_0174917535.html">Binding an EIP</a>.</li></ul>
<div class="section" id="EN-US_TOPIC_0017955633__section58260650112020"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0017955633__ul21492248112020"><li id="EN-US_TOPIC_0017955633__li1586644205812">The target <span id="EN-US_TOPIC_0017955633__text69091938182114">ECS</span> is running.</li><li id="EN-US_TOPIC_0017955633__li59212509112020">You have bound an <span id="EN-US_TOPIC_0017955633__text121624531248">EIP</span> to the <span id="EN-US_TOPIC_0017955633__text161621553132410">ECS</span>. For details, see <a href="en-us_topic_0174917535.html">Binding an EIP</a>.</li></ul>
<ul id="EN-US_TOPIC_0017955633__ul63150538112020"><li id="EN-US_TOPIC_0017955633__li31483937112020">Access to port 22 is allowed in the inbound direction of the security group to which the ECS belongs. For details, see <a href="en-us_topic_0030878383.html">Configuring Security Group Rules</a>.</li><li id="EN-US_TOPIC_0017955633__li12606704164652">The network connection between the login tool (PuTTY) and the target <span id="EN-US_TOPIC_0017955633__text19843161218228">ECS</span> is normal. For example, the default port 22 is not blocked by the firewall.</li><li id="EN-US_TOPIC_0017955633__li5618120217032">You have obtained the SSH login permission and reset the common user password for logging in to the Linux ECS. For details, see <a href="#EN-US_TOPIC_0017955633__section6207684794951">Configuring the Login Permission Using SSH Password Authentication</a>.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0017955633__section6207684794951"><a name="EN-US_TOPIC_0017955633__section6207684794951"></a><a name="section6207684794951"></a><h4 class="sectiontitle">Configuring the Login Permission Using SSH Password Authentication</h4><p id="EN-US_TOPIC_0017955633__p38147731233149"><strong id="EN-US_TOPIC_0017955633__b1645685255112658">Assigning the remote login permission using SSH key authentication</strong></p>
@ -26,15 +26,15 @@
</li><li id="EN-US_TOPIC_0017955633__li46096323233751">Enter the new password as prompted and press <strong id="EN-US_TOPIC_0017955633__b842352706113054">Enter</strong>.</li><li id="EN-US_TOPIC_0017955633__li19111299233837">Confirm the password and press <strong id="EN-US_TOPIC_0017955633__b1437416843113111">Enter</strong>.</li><li id="EN-US_TOPIC_0017955633__li13476537233953">Verify that the information displayed is similar to the following, indicating that the password has been reset:<pre class="screen" id="EN-US_TOPIC_0017955633__screen11282117234025">passwd: all authentication tokens updated successfully.</pre>
</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0017955633__section62068112020"><a name="EN-US_TOPIC_0017955633__section62068112020"></a><a name="section62068112020"></a><h4 class="sectiontitle">Logging In to the Linux ECS from a Local Windows Server</h4><p id="EN-US_TOPIC_0017955633__p5027585112020">To log in to the Linux ECS from a local Windows server, perform the operations described in this section.</p>
<div class="section" id="EN-US_TOPIC_0017955633__section62068112020"><a name="EN-US_TOPIC_0017955633__section62068112020"></a><a name="section62068112020"></a><h4 class="sectiontitle">Logging In to a Linux ECS from a Local Windows Server</h4><p id="EN-US_TOPIC_0017955633__p5027585112020">To log in to the Linux ECS from a local Windows server, perform the operations described in this section.</p>
<p id="EN-US_TOPIC_0017955633__p45248268112020">The following operations use PuTTY as an example to log in to the ECS.</p>
<ol id="EN-US_TOPIC_0017955633__ol4581230112020"><li id="EN-US_TOPIC_0017955633__li8851985111724">Visit the following website and download PuTTY and PuTTYgen:<p id="EN-US_TOPIC_0017955633__p12559002111724"><a name="EN-US_TOPIC_0017955633__li8851985111724"></a><a name="li8851985111724"></a><a href="https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html" target="_blank" rel="noopener noreferrer">https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html</a></p>
</li><li id="EN-US_TOPIC_0017955633__li41231072112020">Run PuTTY.</li><li id="EN-US_TOPIC_0017955633__li9404716608">Click <strong id="EN-US_TOPIC_0017955633__b842352706184217">Session</strong>.<ol type="a" id="EN-US_TOPIC_0017955633__ol83682225010"><li id="EN-US_TOPIC_0017955633__li35535331112020"><strong id="EN-US_TOPIC_0017955633__b19479145302217">Host Name (or IP address)</strong>: <span id="EN-US_TOPIC_0017955633__text633933316488">EIP</span> bound to the ECS</li><li id="EN-US_TOPIC_0017955633__li134941257015"><strong id="EN-US_TOPIC_0017955633__b842352706191126">Port</strong>: <strong id="EN-US_TOPIC_0017955633__b842352706191134">22</strong></li><li id="EN-US_TOPIC_0017955633__li2328134319019"><strong id="EN-US_TOPIC_0017955633__b842352706191142">Connection type</strong>: <strong id="EN-US_TOPIC_0017955633__b842352706191145">SSH</strong></li><li id="EN-US_TOPIC_0017955633__li24241919409"><strong id="EN-US_TOPIC_0017955633__b842352706191154">Saved Sessions</strong>: Task name, which can be clicked for remote connection when you use PuTTY next time<div class="fignone" id="EN-US_TOPIC_0017955633__fig74247114018"><span class="figcap"><b>Figure 1 </b>Session</span><br><span><img id="EN-US_TOPIC_0017955633__image1842411117408" src="en-us_image_0159943784.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="EN-US_TOPIC_0017955633__li41231072112020">Run PuTTY.</li><li id="EN-US_TOPIC_0017955633__li9404716608">Choose <strong id="EN-US_TOPIC_0017955633__b842352706184217">Session</strong>.<ol type="a" id="EN-US_TOPIC_0017955633__ol83682225010"><li id="EN-US_TOPIC_0017955633__li35535331112020"><strong id="EN-US_TOPIC_0017955633__b19479145302217">Host Name (or IP address)</strong>: Enter the <span id="EN-US_TOPIC_0017955633__text633933316488">EIP</span> bound to the ECS.</li><li id="EN-US_TOPIC_0017955633__li134941257015"><strong id="EN-US_TOPIC_0017955633__b842352706191126">Port</strong>: Enter <strong id="EN-US_TOPIC_0017955633__b842352706191134">22</strong>.</li><li id="EN-US_TOPIC_0017955633__li2328134319019"><strong id="EN-US_TOPIC_0017955633__b842352706191142">Connection type</strong>: Click <strong id="EN-US_TOPIC_0017955633__b842352706191145">SSH</strong>.</li><li id="EN-US_TOPIC_0017955633__li24241919409"><strong id="EN-US_TOPIC_0017955633__b842352706191154">Saved Sessions</strong>: Enter the task name, which can be clicked for remote connection when you use PuTTY next time.<div class="fignone" id="EN-US_TOPIC_0017955633__fig74247114018"><span class="figcap"><b>Figure 1 </b>Session</span><br><span><img id="EN-US_TOPIC_0017955633__image1842411117408" src="en-us_image_0159943784.png" title="Click to enlarge" class="imgResize"></span></div>
</li></ol>
</li><li id="EN-US_TOPIC_0017955633__li57338753152141">Click <strong id="EN-US_TOPIC_0017955633__b842352706193658">Window</strong>. Then, select <strong id="EN-US_TOPIC_0017955633__b842352706193721">UTF-8</strong> for <strong id="EN-US_TOPIC_0017955633__b842352706193739">Received data assumed to be in which character set:</strong> in <strong id="EN-US_TOPIC_0017955633__b842352706193750">Translation</strong>.</li><li id="EN-US_TOPIC_0017955633__li51382529112020">Click <strong>Open</strong>.<p id="EN-US_TOPIC_0017955633__p1632617563617">If you log in to the ECS for the first time, PuTTY displays a security warning dialog box, asking you whether to accept the ECS security certificate. Click <strong id="EN-US_TOPIC_0017955633__b842352706192127">Yes</strong> to save the certificate to your local registry.</p>
</li><li id="EN-US_TOPIC_0017955633__li57338753152141">Choose <strong id="EN-US_TOPIC_0017955633__b842352706193658">Window</strong>. Then, select <strong id="EN-US_TOPIC_0017955633__b842352706193721">UTF-8</strong> for <strong id="EN-US_TOPIC_0017955633__b842352706193739">Received data assumed to be in which character set:</strong> in <strong id="EN-US_TOPIC_0017955633__b842352706193750">Translation</strong>.</li><li id="EN-US_TOPIC_0017955633__li51382529112020">Click <strong id="EN-US_TOPIC_0017955633__b19798133415207">Open</strong>.<p id="EN-US_TOPIC_0017955633__p1632617563617">If you log in to the ECS for the first time, PuTTY displays a security warning dialog box, asking you whether to accept the ECS security certificate. Click <strong id="EN-US_TOPIC_0017955633__b842352706192127">Yes</strong> to save the certificate to your local registry.</p>
</li><li id="EN-US_TOPIC_0017955633__li59789577112020">After the SSH connection to the ECS is set up, enter the username and password as prompted to log in to the ECS.</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0017955633__section20811823174313"><a name="EN-US_TOPIC_0017955633__section20811823174313"></a><a name="section20811823174313"></a><h4 class="sectiontitle">Logging In to the Linux ECS from a Local Linux Server</h4><p id="EN-US_TOPIC_0017955633__p189302063719">To log in to the Linux ECS from a local Linux server, run the following command: </p>
<div class="section" id="EN-US_TOPIC_0017955633__section20811823174313"><a name="EN-US_TOPIC_0017955633__section20811823174313"></a><a name="section20811823174313"></a><h4 class="sectiontitle">Logging In to a Linux ECS from a Local Linux Server</h4><p id="EN-US_TOPIC_0017955633__p189302063719">To log in to the Linux ECS from a local Linux server, run the following command: </p>
<p id="EN-US_TOPIC_0017955633__p51649214112020"><strong id="EN-US_TOPIC_0017955633__b13662192021315">ssh</strong> <strong id="EN-US_TOPIC_0017955633__b1105129394131"><em id="EN-US_TOPIC_0017955633__i2734100494130">EIP bound to the ECS</em></strong></p>
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<td class="cellrowborder" valign="top" width="16.41%" headers="mcps1.3.1.2.2.2.2.5.1.3 "><p id="EN-US_TOPIC_0018073215__p18413105011504">59</p>
</td>
<td class="cellrowborder" valign="top" width="48.92%" headers="mcps1.3.1.2.2.2.2.5.1.4 "><p id="EN-US_TOPIC_0018073215__p2413115045016">VBD disks + SCSI disks ≤ 60 (This constraint does not apply to local disks.)</p>
<p id="EN-US_TOPIC_0018073215__p341335020502">The number of local disks is determined based on the <span id="EN-US_TOPIC_0018073215__text1798730048">ECS</span> flavor.</p>
<p id="EN-US_TOPIC_0018073215__p341335020502">The number of local disks is determined based on the <span id="EN-US_TOPIC_0018073215__text1874037574">ECS</span> flavor.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0018073215__row17413145010507"><td class="cellrowborder" valign="top" width="18.6%" headers="mcps1.3.1.2.2.2.2.5.1.1 "><p id="EN-US_TOPIC_0018073215__p3413050125016">D2</p>
@ -30,7 +30,7 @@
<td class="cellrowborder" valign="top" width="16.41%" headers="mcps1.3.1.2.2.2.2.5.1.3 "><p id="EN-US_TOPIC_0018073215__p141345010506">30</p>
</td>
<td class="cellrowborder" valign="top" width="48.92%" headers="mcps1.3.1.2.2.2.2.5.1.4 "><p id="EN-US_TOPIC_0018073215__p64135501508">VBD disks + SCSI disks ≤ 54 (This constraint does not apply to local disks.)</p>
<p id="EN-US_TOPIC_0018073215__p17413550145015">The number of local disks is determined based on the <span id="EN-US_TOPIC_0018073215__text241702762">ECS</span> flavor.</p>
<p id="EN-US_TOPIC_0018073215__p17413550145015">The number of local disks is determined based on the <span id="EN-US_TOPIC_0018073215__text1271828888">ECS</span> flavor.</p>
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<h1 class="topictitle1">Can Multiple EIPs Be Bound to an ECS?</h1>
<div id="body1437550181838"><div class="section" id="EN-US_TOPIC_0018073216__section1851945163017"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0018073216__p6303405720918">Multiple EIPs can be bound to an ECS, but this operation is not recommended.</p>
<p id="EN-US_TOPIC_0018073216__p19349519165733">If you really need to bind multiple EIPs to an ECS, you must manually configure routing policies, which requires high network skills. Exercise caution when performing this operation.</p>
<p id="EN-US_TOPIC_0018073216__p19349519165733">If an ECS has multiple NICs attached and you want to bind multiple EIPs to this ECS, you need to configure policy-based routes for these NICs so that these extension NICs can communicate with external works. For details, see <a href="#EN-US_TOPIC_0018073216__section32091531162222">Configuration Example</a>.</p>
</div>
<div class="section" id="EN-US_TOPIC_0018073216__section32091531162222"><h4 class="sectiontitle">Configuration Example</h4><p id="EN-US_TOPIC_0018073216__p54619536163151"><a href="#EN-US_TOPIC_0018073216__table10449199163243">Table 1</a> lists <span id="EN-US_TOPIC_0018073216__text661413114314">ECS</span> configurations.</p>
<div class="section" id="EN-US_TOPIC_0018073216__section32091531162222"><a name="EN-US_TOPIC_0018073216__section32091531162222"></a><a name="section32091531162222"></a><h4 class="sectiontitle">Configuration Example</h4><p id="EN-US_TOPIC_0018073216__p54619536163151"><a href="#EN-US_TOPIC_0018073216__table10449199163243">Table 1</a> lists <span id="EN-US_TOPIC_0018073216__text661413114314">ECS</span> configurations.</p>
<div class="tablenoborder"><a name="EN-US_TOPIC_0018073216__table10449199163243"></a><a name="table10449199163243"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0018073216__table10449199163243" frame="border" border="1" rules="all"><caption><b>Table 1 </b>ECS configurations</caption><thead align="left"><tr id="EN-US_TOPIC_0018073216__row8662904163243"><th align="left" class="cellrowborder" valign="top" width="25.19%" id="mcps1.3.2.3.2.3.1.1"><p id="EN-US_TOPIC_0018073216__p7023835163243">Parameter</p>
</th>
@ -41,17 +41,17 @@
</table>
</div>
<p id="EN-US_TOPIC_0018073216__p29420320164233"><strong id="EN-US_TOPIC_0018073216__b84235270601519">Example 1:</strong></p>
<div class="p" id="EN-US_TOPIC_0018073216__p41171733162920">If you are required to access public network 11.11.11.0/24 through standby NIC <strong id="EN-US_TOPIC_0018073216__b8423527060169">eth1</strong>, perform the following operations to configure a route:<ol id="EN-US_TOPIC_0018073216__ol18362660164218"><li id="EN-US_TOPIC_0018073216__li42417408164218">Log in to the <span id="EN-US_TOPIC_0018073216__text893111478179">ECS</span>.</li><li id="EN-US_TOPIC_0018073216__li35072844164223">Run the following command to configure a route:<p id="EN-US_TOPIC_0018073216__p3211026816433"><a name="EN-US_TOPIC_0018073216__li35072844164223"></a><a name="li35072844164223"></a><strong id="EN-US_TOPIC_0018073216__b622605418417">ip route add 11.11.11.0/24 dev eth1 via 192.168.2.1</strong></p>
<div class="p" id="EN-US_TOPIC_0018073216__p41171733162920">If you intend to access public network 11.11.11.0/24 through standby NIC <strong id="EN-US_TOPIC_0018073216__b8423527060169">eth1</strong>, perform the following operations to configure a route:<ol id="EN-US_TOPIC_0018073216__ol18362660164218"><li id="EN-US_TOPIC_0018073216__li42417408164218">Log in to the <span id="EN-US_TOPIC_0018073216__text893111478179">ECS</span>.</li><li id="EN-US_TOPIC_0018073216__li35072844164223">Run the following command to configure a route:<p id="EN-US_TOPIC_0018073216__p3211026816433"><a name="EN-US_TOPIC_0018073216__li35072844164223"></a><a name="li35072844164223"></a><strong id="EN-US_TOPIC_0018073216__b622605418417">ip route add 11.11.11.0/24 dev eth1 via 192.168.2.1</strong></p>
<p id="EN-US_TOPIC_0018073216__p7288110164437">In the preceding command, <strong id="EN-US_TOPIC_0018073216__b84235270601739">192.168.2.1</strong> is the gateway IP address of standby NIC <strong id="EN-US_TOPIC_0018073216__b84235270601913">eth1</strong>.</p>
</li></ol>
</div>
<p id="EN-US_TOPIC_0018073216__p30721816164524"><strong id="EN-US_TOPIC_0018073216__b84235270601921">Example 2:</strong></p>
<p id="EN-US_TOPIC_0018073216__p55315599164548">Based on example 1, if you are required to enable routing for default public network traffic through standby NIC <strong id="EN-US_TOPIC_0018073216__b7037019810216">eth1</strong>, perform the following operations to configure a route:</p>
<p id="EN-US_TOPIC_0018073216__p55315599164548">Based on example 1, if you intend to enable routing for default public network traffic through standby NIC <strong id="EN-US_TOPIC_0018073216__b7037019810216">eth1</strong>, perform the following operations to configure a route:</p>
<ol id="EN-US_TOPIC_0018073216__ol16816170164734"><li id="EN-US_TOPIC_0018073216__li56130240164734">Log in to the <span id="EN-US_TOPIC_0018073216__text66355316182">ECS</span>.</li><li id="EN-US_TOPIC_0018073216__li51081423164738">Run the following command to delete the default route:<p id="EN-US_TOPIC_0018073216__p49989555164813"><a name="EN-US_TOPIC_0018073216__li51081423164738"></a><a name="li51081423164738"></a><strong id="EN-US_TOPIC_0018073216__b62521877164816">ip route delete default</strong></p>
<div class="notice" id="EN-US_TOPIC_0018073216__note1762381210332"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0018073216__p96231412163313">Exercise caution when deleting the default route because this operation will interrupt the network and result in SSH login failures.</p>
</div></div>
</li><li id="EN-US_TOPIC_0018073216__li16873338164820">Run the following command to configure a new default route:<p id="EN-US_TOPIC_0018073216__p2759619316498"><a name="EN-US_TOPIC_0018073216__li16873338164820"></a><a name="li16873338164820"></a><strong id="EN-US_TOPIC_0018073216__b7933526124213">ip route add 0.0.0.0/0 dev eth1 via 192.168.2.1</strong></p>
<p id="EN-US_TOPIC_0018073216__p52517685164934">In the preceding command, <strong id="EN-US_TOPIC_0018073216__b190109942">192.168.2.1</strong> is the gateway IP address of standby NIC <strong id="EN-US_TOPIC_0018073216__b409055739">eth1</strong>.</p>
<p id="EN-US_TOPIC_0018073216__p52517685164934">In the preceding command, <strong id="EN-US_TOPIC_0018073216__b288777473">192.168.2.1</strong> is the gateway IP address of standby NIC <strong id="EN-US_TOPIC_0018073216__b1173774501">eth1</strong>.</p>
</li></ol>
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<h1 class="topictitle1">What Happens After I Click the <strong id="b15960720173416">Delete</strong> Button?</h1>
<div id="body1437550181838"><p id="EN-US_TOPIC_0018073218__p27630372203410">After you click <strong id="EN-US_TOPIC_0018073218__b9261203111817">Delete</strong>, the selected <span id="EN-US_TOPIC_0018073218__text10379010389">ECS</span> is deleted. You can also choose to delete the EVS disk and <span id="EN-US_TOPIC_0018073218__text113815545712">EIP</span> of the <span id="EN-US_TOPIC_0018073218__text256951931817">ECS</span>. If you do not delete them, they will be retained. If necessary, you can manually delete them later.</p>
<p id="EN-US_TOPIC_0018073218__p22999252173018">To delete an <span id="EN-US_TOPIC_0018073218__text15419162273818">ECS</span>, perform the following operations:</p>
<ol id="EN-US_TOPIC_0018073218__ol20435070172850"><li id="EN-US_TOPIC_0018073218__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0018073218__li4282974172855">Under <strong id="EN-US_TOPIC_0018073218__b117271848163518"><span id="EN-US_TOPIC_0018073218__text1727174813350">Computing</span></strong>, click <strong id="EN-US_TOPIC_0018073218__b5727144823520">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0018073218__li13480705172913">Select the <span id="EN-US_TOPIC_0018073218__text357813243382">ECS</span> to be deleted.</li><li id="EN-US_TOPIC_0018073218__li7501782172954">In the upper part of the <span id="EN-US_TOPIC_0018073218__text13282132516380">ECS</span> list, click <strong id="EN-US_TOPIC_0018073218__b063323818192">Delete</strong>.</li></ol>
<ol id="EN-US_TOPIC_0018073218__ol20435070172850"><li id="EN-US_TOPIC_0018073218__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0018073218__li4282974172855">Under <strong id="EN-US_TOPIC_0018073218__b1619313925918"><span id="EN-US_TOPIC_0018073218__text01931739175919">Computing</span></strong>, click <strong id="EN-US_TOPIC_0018073218__b201938396598">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0018073218__li13480705172913">Select the <span id="EN-US_TOPIC_0018073218__text357813243382">ECS</span> to be deleted.</li><li id="EN-US_TOPIC_0018073218__li7501782172954">In the upper part of the <span id="EN-US_TOPIC_0018073218__text13282132516380">ECS</span> list, click <strong id="EN-US_TOPIC_0018073218__b063323818192">Delete</strong>.</li></ol>
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<p id="EN-US_TOPIC_0021426802__p1448445101313">Download the ntfs-3g and chntpw software packages of the version required by the temporary <span id="EN-US_TOPIC_0021426802__text1974473512204">ECS</span> OS.</p>
</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0021426802__section1052621215437"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0021426802__ol11891624125717"><li id="EN-US_TOPIC_0021426802__li168911724165711">Stop the original <span id="EN-US_TOPIC_0021426802__text43929361208">ECS</span>, detach the system disk from it, and attach the system disk to the temporary <span id="EN-US_TOPIC_0021426802__text14993123531717">ECS</span>.<ol type="a" id="EN-US_TOPIC_0021426802__ol64363114145227"><li id="EN-US_TOPIC_0021426802__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0021426802__li464234814566">Click <span><img id="EN-US_TOPIC_0021426802__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0021426802__li32846719144331">Under <strong id="EN-US_TOPIC_0021426802__b14977549104218"><span id="EN-US_TOPIC_0021426802__text89771349164218">Computing</span></strong>, click <strong id="EN-US_TOPIC_0021426802__b17977549124216">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0021426802__li16925428202157">Stop the original Windows <span id="EN-US_TOPIC_0021426802__text131511138202011">ECS</span>, switch to the page providing details about the ECS, and click the <strong id="EN-US_TOPIC_0021426802__b551913512188">Disks</strong> tab.<div class="note" id="EN-US_TOPIC_0021426802__note32654683101914"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0021426802__p25456698101914">Do not forcibly stop the Windows <span id="EN-US_TOPIC_0021426802__text15900121411184">ECS</span>. Otherwise, password reset may fail.</p>
<div class="section" id="EN-US_TOPIC_0021426802__section1052621215437"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0021426802__ol11891624125717"><li id="EN-US_TOPIC_0021426802__li168911724165711">Stop the original <span id="EN-US_TOPIC_0021426802__text43929361208">ECS</span>, detach the system disk from it, and attach the system disk to the temporary <span id="EN-US_TOPIC_0021426802__text14993123531717">ECS</span>.<ol type="a" id="EN-US_TOPIC_0021426802__ol64363114145227"><li id="EN-US_TOPIC_0021426802__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0021426802__li464234814566">Click <span><img id="EN-US_TOPIC_0021426802__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0021426802__li32846719144331">Under <strong id="EN-US_TOPIC_0021426802__b115081473101"><span id="EN-US_TOPIC_0021426802__text1450812714101">Computing</span></strong>, click <strong id="EN-US_TOPIC_0021426802__b9508207181015">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0021426802__li16925428202157">Stop the original Windows <span id="EN-US_TOPIC_0021426802__text131511138202011">ECS</span>, switch to the page providing details about the ECS, and click the <strong id="EN-US_TOPIC_0021426802__b551913512188">Disks</strong> tab.<div class="note" id="EN-US_TOPIC_0021426802__note32654683101914"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0021426802__p25456698101914">Do not forcibly stop the Windows <span id="EN-US_TOPIC_0021426802__text15900121411184">ECS</span>. Otherwise, password reset may fail.</p>
</div></div>
</li><li id="EN-US_TOPIC_0021426802__li49674320202157"><a name="EN-US_TOPIC_0021426802__li49674320202157"></a><a name="li49674320202157"></a>Locate the row containing the system disk to be detached and click <strong id="EN-US_TOPIC_0021426802__b129721858184120">Detach</strong> to detach the system disk from the ECS.</li><li id="EN-US_TOPIC_0021426802__li33733137172114">On the page providing details about the temporary <span id="EN-US_TOPIC_0021426802__text12567392209">ECS</span>, click the <strong id="EN-US_TOPIC_0021426802__b1053414917197">Disks</strong> tab.</li><li id="EN-US_TOPIC_0021426802__li32570973202157"><a name="EN-US_TOPIC_0021426802__li32570973202157"></a><a name="li32570973202157"></a>Click <strong id="EN-US_TOPIC_0021426802__b161532951911">Attach Disk</strong>. In the displayed dialog box, select the system disk detached in step <a href="#EN-US_TOPIC_0021426802__li49674320202157">1.e</a> and attach it to the temporary <span id="EN-US_TOPIC_0021426802__text148561039192012">ECS</span>.</li></ol>
</li><li id="EN-US_TOPIC_0021426802__li7881114019576">Log in to the temporary <span id="EN-US_TOPIC_0021426802__text154242409201">ECS</span> remotely and attach the system disk.<ol type="a" id="EN-US_TOPIC_0021426802__ol774330520859"><li id="EN-US_TOPIC_0021426802__li20334892202157"><a name="EN-US_TOPIC_0021426802__li20334892202157"></a><a name="li20334892202157"></a>Run the following command to view the directory of the system disk detached from the original Windows <span id="EN-US_TOPIC_0021426802__text1893694082013">ECS</span> now attached to the temporary <span id="EN-US_TOPIC_0021426802__text1391538162013">ECS</span>:<p id="EN-US_TOPIC_0021426802__p48796301202157"><strong id="EN-US_TOPIC_0021426802__b48318482201615">fdisk -l</strong></p>
@ -28,7 +28,7 @@ Windows fully (no hibernation or fast restarting), or mount the volume
read-only with the 'ro' mount option.</pre>
<p id="EN-US_TOPIC_0021426802__p1887312119392">Back up the disk data, run the following command to rectify the NTFS file system inconsistency, and attach the system disk:</p>
<p id="EN-US_TOPIC_0021426802__p17152203304912"><strong id="EN-US_TOPIC_0021426802__b1573769891153243">ntfsfix /dev/</strong><em id="EN-US_TOPIC_0021426802__i828149149153243">Result obtained in step <a href="#EN-US_TOPIC_0021426802__li20334892202157">2.a</a></em></p>
<p id="EN-US_TOPIC_0021426802__p1115263314917">For example, if the result obtained in step <a href="#EN-US_TOPIC_0021426802__li20334892202157">2.a</a> is <strong id="EN-US_TOPIC_0021426802__b1223039839">xvde2</strong>, run the following command:</p>
<p id="EN-US_TOPIC_0021426802__p1115263314917">For example, if the result obtained in step <a href="#EN-US_TOPIC_0021426802__li20334892202157">2.a</a> is <strong id="EN-US_TOPIC_0021426802__b665316477">xvde2</strong>, run the following command:</p>
<p id="EN-US_TOPIC_0021426802__p0152173394910"><strong id="EN-US_TOPIC_0021426802__b1715213364915">ntfsfix /dev/xvde2</strong></p>
</li></ol>
</li><li id="EN-US_TOPIC_0021426802__li11815752105716">Change the password and clear the original password.<ol type="a" id="EN-US_TOPIC_0021426802__ol50424782201550"><li id="EN-US_TOPIC_0021426802__li62607680202157">Run the following command to back up the SAM file:<p id="EN-US_TOPIC_0021426802__p26598214202157"><a name="EN-US_TOPIC_0021426802__li62607680202157"></a><a name="li62607680202157"></a><strong id="EN-US_TOPIC_0021426802__b38057335202157">cp /mnt/Windows/System32/config/SAM /mnt/Windows/System32/config/SAM.bak</strong></p>

10
docs/ecs/umn/en-us_topic_0024911405.html
View File

@ -6,24 +6,24 @@
<div class="section" id="EN-US_TOPIC_0024911405__section37447471165714"><h4 class="sectiontitle">Notes</h4><ul id="EN-US_TOPIC_0024911405__ul52549321513"><li id="EN-US_TOPIC_0024911405__li22547311515">After the OS is reinstalled, the IP and MAC addresses of the <span id="EN-US_TOPIC_0024911405__text510665714187">ECS</span> remain unchanged.</li><li id="EN-US_TOPIC_0024911405__li714412518167">Reinstalling the OS clears the data in all partitions of the EVS system disk, including the system partition. Therefore, back up data before reinstalling the OS.</li><li id="EN-US_TOPIC_0024911405__li32546316151">Reinstalling the OS does not affect data disks.</li><li id="EN-US_TOPIC_0024911405__li1619118131711">Do not perform any operations on the ECS immediately after its OS is reinstalled. Wait for several minutes until the system successfully injects the password or key. Otherwise, the injection may fail, and the ECS cannot be logged in to.</li><li id="EN-US_TOPIC_0024911405__li1225453201512">After the OS is reinstalled, the password for logging in to the ECS will be reset. To retrieve the password, perform the following operations:<ul id="EN-US_TOPIC_0024911405__ul47135949174127"><li id="EN-US_TOPIC_0024911405__li64411840174127">For a Linux ECS, log in to it using the key and set a new password. For instructions about how to log in to an ECS using a key pair, see <a href="en-us_topic_0017955380.html">Login Using an SSH Key</a>.</li><li id="EN-US_TOPIC_0024911405__li49976570174127">For a Windows ECS, retrieve the password by following the instructions provided in <a href="en-us_topic_0031107266.html">Obtaining the Password for Logging In to a Windows ECS</a>.</li></ul>
</li><li id="EN-US_TOPIC_0024911405__li18581102418264">You can choose to encrypt the system disk of an ECS during OS reinstallation.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0024911405__section4500313111616"><h4 class="sectiontitle">Constraints</h4><ul id="EN-US_TOPIC_0024911405__ul66848156141149"><li id="EN-US_TOPIC_0024911405__li49552913144725">The EVS disk quota must be greater than 0.</li><li id="EN-US_TOPIC_0024911405__li19114641141149">If the target <span id="EN-US_TOPIC_0024911405__text4665833132318">ECS</span> is created using a private image, ensure that the private image is available.</li><li id="EN-US_TOPIC_0024911405__li1287917124216">If an ECS OS is to be reinstalled using a full-ECS image, the ECS system disk can be encrypted.</li></ul>
<div class="section" id="EN-US_TOPIC_0024911405__section4500313111616"><h4 class="sectiontitle">Constraints</h4><ul id="EN-US_TOPIC_0024911405__ul66848156141149"><li id="EN-US_TOPIC_0024911405__li49552913144725">The EVS disk quotas must be greater than 0.</li><li id="EN-US_TOPIC_0024911405__li19114641141149">If the target <span id="EN-US_TOPIC_0024911405__text4665833132318">ECS</span> is created using a private image, ensure that the private image is available.</li><li id="EN-US_TOPIC_0024911405__li1287917124216">If an ECS OS is to be reinstalled using a full-ECS image, the ECS system disk can be encrypted.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0024911405__section2641260214160"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0024911405__ul5982276195952"><li id="EN-US_TOPIC_0024911405__li31738699195952">The target <span id="EN-US_TOPIC_0024911405__text158042287207">ECS</span> is stopped.</li><li id="EN-US_TOPIC_0024911405__li4397542520019">The target <span id="EN-US_TOPIC_0024911405__text18074162111">ECS</span> has a system disk attached.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0024911405__section58299059111554"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0024911405__ol22026412143346"><li id="EN-US_TOPIC_0024911405__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0024911405__li464234814566">Click <span><img id="EN-US_TOPIC_0024911405__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0024911405__li20776247143354"><a name="EN-US_TOPIC_0024911405__li20776247143354"></a><a name="li20776247143354"></a>Under <strong id="EN-US_TOPIC_0024911405__b12190175781214"><span id="EN-US_TOPIC_0024911405__text219018570129">Computing</span></strong>, click <strong id="EN-US_TOPIC_0024911405__b1619012572127">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0024911405__li1085462314256">Locate the row containing the target <span id="EN-US_TOPIC_0024911405__text615091615218">ECS</span>. Click <strong id="EN-US_TOPIC_0024911405__b18151716152119">More</strong> in the <strong id="EN-US_TOPIC_0024911405__b5151111622111">Operation</strong> column and select <strong id="EN-US_TOPIC_0024911405__b5222101584415">Manage Image/Disk</strong> &gt; <strong id="EN-US_TOPIC_0024911405__b1315161615214">Reinstall OS</strong>.<p id="EN-US_TOPIC_0024911405__p3854122302512">Only stopped <span id="EN-US_TOPIC_0024911405__text63993291215">ECS</span>s support OS reinstallation. If the <span id="EN-US_TOPIC_0024911405__text512812372212">ECS</span> is not stopped, stop it before proceeding with reinstallation.</p>
<div class="section" id="EN-US_TOPIC_0024911405__section58299059111554"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0024911405__ol22026412143346"><li id="EN-US_TOPIC_0024911405__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0024911405__li464234814566">Click <span><img id="EN-US_TOPIC_0024911405__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0024911405__li20776247143354"><a name="EN-US_TOPIC_0024911405__li20776247143354"></a><a name="li20776247143354"></a>Under <strong id="EN-US_TOPIC_0024911405__b4285105716331"><span id="EN-US_TOPIC_0024911405__text13285057193311">Computing</span></strong>, click <strong id="EN-US_TOPIC_0024911405__b102856570331">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0024911405__li1085462314256">Locate the row containing the target <span id="EN-US_TOPIC_0024911405__text615091615218">ECS</span>. Click <strong id="EN-US_TOPIC_0024911405__b18151716152119">More</strong> in the <strong id="EN-US_TOPIC_0024911405__b5151111622111">Operation</strong> column and select <strong id="EN-US_TOPIC_0024911405__b5222101584415">Manage Image/Disk/Backup</strong> &gt; <strong id="EN-US_TOPIC_0024911405__b1315161615214">Reinstall OS</strong>.<p id="EN-US_TOPIC_0024911405__p3854122302512">Only stopped <span id="EN-US_TOPIC_0024911405__text63993291215">ECS</span>s support OS reinstallation. If the <span id="EN-US_TOPIC_0024911405__text512812372212">ECS</span> is not stopped, stop it before proceeding with reinstallation.</p>
</li><li id="EN-US_TOPIC_0024911405__li8531832155310">(Optional) Select the <strong id="EN-US_TOPIC_0024911405__b67851632192510">Encryption</strong> option to encrypt the system disk during OS reinstallation.<p id="EN-US_TOPIC_0024911405__p767712438280">To enable encryption, click <span class="uicontrol" id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0144542112_uicontrol528614138616"><b>Create Xrole</b></span> to assign KMS access permissions to EVS. If you have rights granting permission, assign the KMS access permissions to EVS. If you do not have the permission, contact the user having the security administrator rights to assign the KMS access permissions. For details, see <a href="en-us_topic_0047272493.html">Can All Users Use the Encryption Feature?</a></p>
<p id="EN-US_TOPIC_0024911405__en-us_topic_0144542112_p228631310615">Encryption parameters are as follows:</p>
<ul id="EN-US_TOPIC_0024911405__en-us_topic_0144542112_ul202865131169"><li id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0144542112_li14286813962"><strong id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0013859510_b84235270618740">Encryption</strong>: indicates that the EVS disk has been encrypted.</li><li id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0144542112_li182868131664"><strong id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0013859510_b8423527061882">Create Xrole</strong>: assigns KMS access permissions to EVS to obtain KMS keys. After the permissions are assigned, follow-up operations do not require assigning permissions again.</li><li id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0144542112_li5286191313611"><strong id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0013859510_b84235270615143">Xrole Name: EVSAccessKMS</strong>: specifies that permissions have been assigned to EVS to obtain KMS keys for encrypting or decrypting EVS disks.</li><li id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0144542112_li152868131619"><strong id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_b959511561916">KMS Key Name</strong>: specifies the name of the key used by the encrypted EVS disk. You can select an existing key, or click <strong id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_b2406645144311">Create KMS Key</strong> and create a new one on the KMS console. The default value is <strong id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_b626615844413">evs/default</strong>.</li><li id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0144542112_li528671319610"><strong id="EN-US_TOPIC_0024911405__en-us_topic_0163572589_en-us_topic_0013859510_b842352706155046">KMS Key ID</strong>: specifies the ID of the key used by the encrypted data disk.</li></ul>
</li><li id="EN-US_TOPIC_0024911405__li23576357205117">(Optional) Select a <strong id="EN-US_TOPIC_0024911405__b84235270615319">License Type</strong> (<strong id="EN-US_TOPIC_0024911405__b842352706153129">Use license from the system</strong> or <strong id="EN-US_TOPIC_0024911405__b842352706153134">Bring your own license (BYOL)</strong>) if the reinstalled OS running on your ECS is billed. For more details, see <a href="en-us_topic_0046566932.html">License Type</a>.<p id="EN-US_TOPIC_0024911405__p46529483205117">The following OSs are billed:</p>
<ul id="EN-US_TOPIC_0024911405__ul55183157205155"><li id="EN-US_TOPIC_0024911405__en-us_topic_0046566932_li2586589022251">SUSE Linux Enterprise Server</li><li id="EN-US_TOPIC_0024911405__en-us_topic_0046566932_li6521605722253">Oracle Enterprise Linux</li><li id="EN-US_TOPIC_0024911405__en-us_topic_0046566932_li37000181205155">Red Hat Enterprise Linux</li></ul>
</li><li id="EN-US_TOPIC_0024911405__li65835346143541">Configure the login mode.<p id="EN-US_TOPIC_0024911405__p35928679153231"><a name="EN-US_TOPIC_0024911405__li65835346143541"></a><a name="li65835346143541"></a>If the target <span id="EN-US_TOPIC_0024911405__text22614242316">ECS</span> uses key pair authentication, you can replace the original key pair.</p>
</li><li id="EN-US_TOPIC_0024911405__li65835346143541">Select the login mode.<p id="EN-US_TOPIC_0024911405__p35928679153231"><a name="EN-US_TOPIC_0024911405__li65835346143541"></a><a name="li65835346143541"></a>If the target <span id="EN-US_TOPIC_0024911405__text22614242316">ECS</span> uses key pair authentication, you can replace the original key pair.</p>
</li><li id="EN-US_TOPIC_0024911405__li55647207143541">Click <strong id="EN-US_TOPIC_0024911405__b32047965114410">OK</strong>.</li><li id="EN-US_TOPIC_0024911405__li31062819143541"><a name="EN-US_TOPIC_0024911405__li31062819143541"></a><a name="li31062819143541"></a>On the <strong id="EN-US_TOPIC_0024911405__b634582917420">ECS OS Reinstallation</strong> page, confirm the OS specifications, and click <strong id="EN-US_TOPIC_0024911405__b130315244315">Submit Application</strong>.<div class="p" id="EN-US_TOPIC_0024911405__p3796675416556">After the request is submitted, the <span id="EN-US_TOPIC_0024911405__text10778829132413">ECS</span> status changes to <strong id="EN-US_TOPIC_0024911405__b84235270616717">Reinstalling</strong>. The reinstallation has been completed when the <span id="EN-US_TOPIC_0024911405__text16217439112514">ECS</span> status changes to <strong id="EN-US_TOPIC_0024911405__b842352706111558">Running</strong>.<div class="note" id="EN-US_TOPIC_0024911405__note8958845143541"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0024911405__p13520745143541">A temporary <span id="EN-US_TOPIC_0024911405__text11832184415256">ECS</span> is created during the reinstallation process. After reinstallation, this <span id="EN-US_TOPIC_0024911405__text976155011257">ECS</span> will be automatically deleted. Do not perform any operation on the temporary <span id="EN-US_TOPIC_0024911405__text97141831172413">ECS</span> during the reinstallation process.</p>
</div></div>
</div>
</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0024911405__section12556769105440"><h4 class="sectiontitle">Follow-up Procedure</h4><p id="EN-US_TOPIC_0024911405__p28023873143318">If the reinstallation is unsuccessful, perform steps <a href="#EN-US_TOPIC_0024911405__li20776247143354">3</a> to <a href="#EN-US_TOPIC_0024911405__li31062819143541">9</a> again to retry the OS installation.</p>
<p id="EN-US_TOPIC_0024911405__p28308785143318">If the second reinstallation attempt is unsuccessful, contact customer service for manual recovery at the backend.</p>
<div class="section" id="EN-US_TOPIC_0024911405__section12556769105440"><h4 class="sectiontitle">Follow-up Procedure</h4><p id="EN-US_TOPIC_0024911405__p28023873143318">If the reinstallation fails, perform steps <a href="#EN-US_TOPIC_0024911405__li20776247143354">3</a> to <a href="#EN-US_TOPIC_0024911405__li31062819143541">9</a> again to retry the OS installation.</p>
<p id="EN-US_TOPIC_0024911405__p28308785143318">If the second reinstallation attempt still fails, contact customer service for manual recovery at the backend.</p>
</div>
</div>
<div>

4
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@ -8,7 +8,7 @@
<div class="section" id="EN-US_TOPIC_0027157850__section2608915610029"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0027157850__ul57147806103027"><li id="EN-US_TOPIC_0027157850__li5394806103027">A proxy <span id="EN-US_TOPIC_0027157850__text15137193753916">ECS</span> with an EIP bound is available.</li><li id="EN-US_TOPIC_0027157850__li43600437114252">The IP address of the proxy <span id="EN-US_TOPIC_0027157850__text1698539203918">ECS</span> is in the same network and same security group as the <span id="EN-US_TOPIC_0027157850__text3883204613918">ECS</span>s that need to access the Internet.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0027157850__section6907807103042"><h4 class="sectiontitle">Linux Proxy <span id="EN-US_TOPIC_0027157850__text11280191042018">ECS</span></h4><p id="EN-US_TOPIC_0027157850__p96322674819">In this example, the proxy <span id="EN-US_TOPIC_0027157850__text120563515207">ECS</span> runs CentOS 6.5.</p>
<ol id="EN-US_TOPIC_0027157850__ol33320884113959"><li id="EN-US_TOPIC_0027157850__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0027157850__li464234814566">Click <span><img id="EN-US_TOPIC_0027157850__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0027157850__li46924084113959">Under <strong id="EN-US_TOPIC_0027157850__b2067314412401"><span id="EN-US_TOPIC_0027157850__text186731346406">Computing</span></strong>, click <strong id="EN-US_TOPIC_0027157850__b167419410405">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0027157850__li42754441113959">In the search box above the upper right corner of the <span id="EN-US_TOPIC_0027157850__text6178154220399">ECS</span> list, enter the proxy <span id="EN-US_TOPIC_0027157850__text6468125715118">ECS</span> name for search.</li><li id="EN-US_TOPIC_0027157850__li49245655113959">Click the name of the proxy <span id="EN-US_TOPIC_0027157850__text10882134212391">ECS</span>. The page providing details about the <span id="EN-US_TOPIC_0027157850__text1799143012106">ECS</span> is displayed.</li><li id="EN-US_TOPIC_0027157850__li38671581113959">On the <strong id="EN-US_TOPIC_0027157850__b78521213111813">Network Interfaces</strong> tab, click <span><img id="EN-US_TOPIC_0027157850__image16740174871" src="en-us_image_0128851717.png"></span>. Then, disable <strong id="EN-US_TOPIC_0027157850__b78601113161816">Source/Destination Check</strong>.<p id="EN-US_TOPIC_0027157850__p1846151153411">By default, the source/destination check function is enabled. When this function is enabled, the system checks whether source IP addresses contained in the packets sent by <span id="EN-US_TOPIC_0027157850__text159541444113919">ECS</span>s are correct. If the IP addresses are incorrect, the system does not allow the <span id="EN-US_TOPIC_0027157850__text16431453151110">ECS</span>s to send the packets. This mechanism prevents packet spoofing, thereby improving system security. However, this mechanism prevents the packet sender from receiving returned packets. Therefore, disable the source/destination check.</p>
<ol id="EN-US_TOPIC_0027157850__ol33320884113959"><li id="EN-US_TOPIC_0027157850__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0027157850__li464234814566">Click <span><img id="EN-US_TOPIC_0027157850__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0027157850__li46924084113959">Under <strong id="EN-US_TOPIC_0027157850__b10388183315347"><span id="EN-US_TOPIC_0027157850__text103882339340">Computing</span></strong>, click <strong id="EN-US_TOPIC_0027157850__b1438853320344">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0027157850__li42754441113959">In the search box above the upper right corner of the <span id="EN-US_TOPIC_0027157850__text6178154220399">ECS</span> list, enter the proxy <span id="EN-US_TOPIC_0027157850__text6468125715118">ECS</span> name for search.</li><li id="EN-US_TOPIC_0027157850__li49245655113959">Click the name of the proxy <span id="EN-US_TOPIC_0027157850__text10882134212391">ECS</span>. The page providing details about the <span id="EN-US_TOPIC_0027157850__text1799143012106">ECS</span> is displayed.</li><li id="EN-US_TOPIC_0027157850__li38671581113959">On the <strong id="EN-US_TOPIC_0027157850__b78521213111813">Network Interfaces</strong> tab, click <span><img id="EN-US_TOPIC_0027157850__image16740174871" src="en-us_image_0128851717.png"></span>. Then, disable <strong id="EN-US_TOPIC_0027157850__b78601113161816">Source/Destination Check</strong>.<p id="EN-US_TOPIC_0027157850__p1846151153411">By default, the source/destination check function is enabled. When this function is enabled, the system checks whether source IP addresses contained in the packets sent by <span id="EN-US_TOPIC_0027157850__text159541444113919">ECS</span>s are correct. If the IP addresses are incorrect, the system does not allow the <span id="EN-US_TOPIC_0027157850__text16431453151110">ECS</span>s to send the packets. This mechanism prevents packet spoofing, thereby improving system security. However, this mechanism prevents the packet sender from receiving returned packets. Therefore, disable the source/destination check.</p>
</li><li id="EN-US_TOPIC_0027157850__li5860308113959">Log in to the proxy <span id="EN-US_TOPIC_0027157850__text7842746163912">ECS</span>.<p id="EN-US_TOPIC_0027157850__p45390388113959">For more details, see <a href="en-us_topic_0013771089.html">Login Overview</a>.</p>
</li><li id="EN-US_TOPIC_0027157850__li32041953113959">Run the following command to check whether the proxy <span id="EN-US_TOPIC_0027157850__text525035053916">ECS</span> can access the Internet:<p id="EN-US_TOPIC_0027157850__p4922924113959"><strong id="EN-US_TOPIC_0027157850__b52742774113959">ping www.google.com</strong></p>
<p id="EN-US_TOPIC_0027157850__p44306317113959">The proxy <span id="EN-US_TOPIC_0027157850__text12634115123917">ECS</span> can access the Internet if information similar to the following is displayed:</p>
@ -39,7 +39,7 @@
</li><li id="EN-US_TOPIC_0027157850__li47056383113959">Run the following command to check whether SNAT has been configured:<p id="EN-US_TOPIC_0027157850__p43562301113959"><a name="EN-US_TOPIC_0027157850__li47056383113959"></a><a name="li47056383113959"></a><strong id="EN-US_TOPIC_0027157850__b42122957113959">iptables -t nat --list</strong></p>
<p id="EN-US_TOPIC_0027157850__p38885512113959">SNAT has been configured if information similar to <a href="#EN-US_TOPIC_0027157850__fig27598108113959">Figure 1</a> is displayed.</p>
<div class="fignone" id="EN-US_TOPIC_0027157850__fig27598108113959"><a name="EN-US_TOPIC_0027157850__fig27598108113959"></a><a name="fig27598108113959"></a><span class="figcap"><b>Figure 1 </b>Successful SNAT configuration</span><br><span><img id="EN-US_TOPIC_0027157850__image62718780113959" src="en-us_image_0027174005.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="EN-US_TOPIC_0027157850__li66936514113959">Add a route.<ol type="a" id="EN-US_TOPIC_0027157850__ol52176633113959"><li id="EN-US_TOPIC_0027157850__li648610515510">Log in to the management console.</li><li id="EN-US_TOPIC_0027157850__li7951089219">Click <span><img id="EN-US_TOPIC_0027157850__en-us_topic_0014250631_image1862675853202121_1" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0027157850__li53470716113959">Under <strong id="EN-US_TOPIC_0027157850__b603523229"><span id="EN-US_TOPIC_0027157850__text159160124215">Network</span></strong>, click <strong id="EN-US_TOPIC_0027157850__b1826514763">Virtual Private Cloud</strong>.</li><li id="EN-US_TOPIC_0027157850__li11474399113959">Choose <strong id="EN-US_TOPIC_0027157850__b18105111173">Route Tables</strong> in the left navigation pane. On the displayed page, click a VPC which a route is to be added to. On the displayed page, click <strong id="EN-US_TOPIC_0027157850__b73147752173149">Add Route</strong>.</li><li id="EN-US_TOPIC_0027157850__li20710484113959">Set route information on the displayed page.<ul id="EN-US_TOPIC_0027157850__ul54496948113959"><li id="EN-US_TOPIC_0027157850__li36160729113959"><strong id="EN-US_TOPIC_0027157850__b1895292621">Destination</strong>: indicates the destination network segment. The default value is <strong id="EN-US_TOPIC_0027157850__b1647309238">0.0.0.0/0</strong>.</li><li id="EN-US_TOPIC_0027157850__li43337918113959"><strong id="EN-US_TOPIC_0027157850__b962886197">Next Hop</strong>: indicates the private IP address of the SNAT <span id="EN-US_TOPIC_0027157850__text1529794058">ECS</span>.<p id="EN-US_TOPIC_0027157850__p57011107113959">You can obtain the private IP address of the <span id="EN-US_TOPIC_0027157850__text48821157123917">ECS</span> on the <strong id="EN-US_TOPIC_0027157850__b11550213161515">Elastic Cloud Server</strong> page.</p>
</li><li id="EN-US_TOPIC_0027157850__li66936514113959">Add a route.<ol type="a" id="EN-US_TOPIC_0027157850__ol52176633113959"><li id="EN-US_TOPIC_0027157850__li648610515510">Log in to the management console.</li><li id="EN-US_TOPIC_0027157850__li7951089219">Click <span><img id="EN-US_TOPIC_0027157850__en-us_topic_0014250631_image1862675853202121_1" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0027157850__li53470716113959">Under <strong id="EN-US_TOPIC_0027157850__b1097290930"><span id="EN-US_TOPIC_0027157850__text159160124215">Network</span></strong>, click <strong id="EN-US_TOPIC_0027157850__b1602867739">Virtual Private Cloud</strong>.</li><li id="EN-US_TOPIC_0027157850__li11474399113959">Choose <strong id="EN-US_TOPIC_0027157850__b18105111173">Route Tables</strong> in the left navigation pane. On the displayed page, click a VPC which a route is to be added to. On the displayed page, click <strong id="EN-US_TOPIC_0027157850__b73147752173149">Add Route</strong>.</li><li id="EN-US_TOPIC_0027157850__li20710484113959">Set route information on the displayed page.<ul id="EN-US_TOPIC_0027157850__ul54496948113959"><li id="EN-US_TOPIC_0027157850__li36160729113959"><strong id="EN-US_TOPIC_0027157850__b100478075">Destination</strong>: indicates the destination network segment. The default value is <strong id="EN-US_TOPIC_0027157850__b199141740">0.0.0.0/0</strong>.</li><li id="EN-US_TOPIC_0027157850__li43337918113959"><strong id="EN-US_TOPIC_0027157850__b44058088">Next Hop</strong>: indicates the private IP address of the proxy <span id="EN-US_TOPIC_0027157850__text205900803">ECS</span>.<p id="EN-US_TOPIC_0027157850__p57011107113959">You can obtain the private IP address of the <span id="EN-US_TOPIC_0027157850__text48821157123917">ECS</span> on the <strong id="EN-US_TOPIC_0027157850__b11550213161515">Elastic Cloud Server</strong> page.</p>
</li></ul>
</li></ol>
</li><li id="EN-US_TOPIC_0027157850__li8776155274817">To delete the added iptables rules, run the following command:<p id="EN-US_TOPIC_0027157850__p237194319550"><a name="EN-US_TOPIC_0027157850__li8776155274817"></a><a name="li8776155274817"></a><strong id="EN-US_TOPIC_0027157850__b113917801813">iptables -t nat -D POSTROUTING -o eth0 -s</strong> <em id="EN-US_TOPIC_0027157850__i8372144335512">subnet/netmask-bits</em> <strong id="EN-US_TOPIC_0027157850__b1460282592619">-j SNAT --to</strong> <em id="EN-US_TOPIC_0027157850__i5374194312551">nat-instance-ip</em></p>

8
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@ -3,7 +3,7 @@
<h1 class="topictitle1">Login Using VNC</h1>
<div id="body1457667709699"><div class="section" id="EN-US_TOPIC_0027268511__section3441113220515"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0027268511__p38310930111459">This section describes how to use VNC provided on the management console to log in to an ECS. This function applies to emergency O&amp;M. In other scenarios, you are advised to log in to ECSs using SSH or MSTSC.</p>
</div>
<div class="section" id="EN-US_TOPIC_0027268511__section19897287191525"><h4 class="sectiontitle">Constraints</h4><ul id="EN-US_TOPIC_0027268511__ul43850825142914"><li id="EN-US_TOPIC_0027268511__li25396503142914">The remote login function is implemented using customized ports. Therefore, before attempting to log in remotely, ensure that the port to be used is not blocked by the firewall. For example, if the remote login link is xxx:8002, ensure that port 8002 is not blocked by the firewall.</li><li id="EN-US_TOPIC_0027268511__li27241935142914">If the client OS uses a local proxy and the firewall port cannot be configured on the local proxy, disable the proxy mode and then try logging in remotely.</li><li id="EN-US_TOPIC_0027268511__li155932291888">Certain G series of ECSs do not support remote login provided by the management console. If you need to remotely log in to the ECSs, install the VNC server on them. For details, see <a href="en-us_topic_0097289624.html">GPU-accelerated ECSs</a>. You are suggested to log in to the ECSs using MSTSC.</li></ul>
<div class="section" id="EN-US_TOPIC_0027268511__section19897287191525"><h4 class="sectiontitle">Constraints</h4><ul id="EN-US_TOPIC_0027268511__ul43850825142914"><li id="EN-US_TOPIC_0027268511__li25396503142914">The remote login function is implemented using customized ports. Therefore, before attempting to log in remotely, ensure that the port to be used is not blocked by the firewall. For example, if the remote login link is xxx:8002, ensure that port 8002 is not blocked by the firewall.</li><li id="EN-US_TOPIC_0027268511__li27241935142914">If the client OS uses a local proxy and the firewall port cannot be configured on the local proxy, disable the proxy mode and then try logging in remotely.</li><li id="EN-US_TOPIC_0027268511__li155932291888">Certain G-series ECSs do not support remote login from the console. If you need to remotely log in to the ECSs, install the VNC server on them. For details, see <a href="en-us_topic_0097289624.html">GPU-accelerated ECSs</a>. You are suggested to log in to the ECSs using MSTSC.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0027268511__section3272280121431"><h4 class="sectiontitle">Login Notes</h4><ol id="EN-US_TOPIC_0027268511__ol60125854214516"><li id="EN-US_TOPIC_0027268511__li31499299214613">When you log in to the ECS using VNC, four types of keyboards will be used. These are described in <a href="#EN-US_TOPIC_0027268511__en-us_topic_0039525621_table10692372181721">Table 1</a>.
<div class="tablenoborder"><a name="EN-US_TOPIC_0027268511__en-us_topic_0039525621_table10692372181721"></a><a name="en-us_topic_0039525621_table10692372181721"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_table10692372181721" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Keyboard types</caption><thead align="left"><tr id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_row53137814181721"><th align="left" class="cellrowborder" valign="top" width="21.62%" id="mcps1.3.3.2.1.2.2.4.1.1"><p id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_p30908407181721">Keyboard Type</p>
@ -41,7 +41,7 @@
<tr id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_row25012200181721"><td class="cellrowborder" valign="top" width="21.62%" headers="mcps1.3.3.2.1.2.2.4.1.1 "><p id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_p59196322181721">ECS OS keyboard</p>
</td>
<td class="cellrowborder" valign="top" width="43.79%" headers="mcps1.3.3.2.1.2.2.4.1.2 "><p id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_p6445544610506">Input method keyboard configured in the ECS OS. Ensure that this input method complies with the physical keyboard language type for correct response to the entered data transferred from the VNC client.</p>
<div class="note" id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_note17013726105332"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_ul4327783510508"><li id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_li2767046105010">The default OS keyboard language of an ECS created using a public image is English. For additional information, see <em id="EN-US_TOPIC_0027268511__i77562519457"><a href="https://docs.otc.t-systems.com/en-us/ims/index.html" target="_blank" rel="noopener noreferrer">Public Images Introduction</a></em>.</li><li id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_li1242727710508">The OS keyboard language of an ECS created using a private image is customized.</li></ul>
<div class="note" id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_note17013726105332"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_ul4327783510508"><li id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_li2767046105010">The default OS keyboard language of an ECS created using a public image is English. For additional information, see <em id="EN-US_TOPIC_0027268511__i77562519457"><a href="https://docs.otc.t-systems.com/image-management-service/public-images/" target="_blank" rel="noopener noreferrer">Public Images Introduction</a></em>.</li><li id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_li1242727710508">The OS keyboard language of an ECS created using a private image is customized.</li></ul>
</div></div>
</td>
<td class="cellrowborder" valign="top" width="34.589999999999996%" headers="mcps1.3.3.2.1.2.2.4.1.3 "><p id="EN-US_TOPIC_0027268511__en-us_topic_0039525621_p49626590181721">Configured by users locally.</p>
@ -188,9 +188,9 @@
</div>
<div class="section" id="EN-US_TOPIC_0027268511__section5982347111459"><a name="EN-US_TOPIC_0027268511__section5982347111459"></a><a name="section5982347111459"></a><h4 class="sectiontitle">Log In to a Windows ECS Using a Non-English Keyboard</h4><ol id="EN-US_TOPIC_0027268511__ol14808116111459"><li id="EN-US_TOPIC_0027268511__li66164181111459">Log in to the management console.</li><li id="EN-US_TOPIC_0027268511__li046177101213">Click <span><img id="EN-US_TOPIC_0027268511__en-us_topic_0014250631_image1862675853202121_1" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0027268511__li17452565111640">Under <strong id="EN-US_TOPIC_0027268511__b10427447115915">Computing</strong>, click <strong id="EN-US_TOPIC_0027268511__b12427247205916">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0027268511__li52373941115359">Obtain the password for logging in to the ECS.<p id="EN-US_TOPIC_0027268511__p5038532111540"><a name="EN-US_TOPIC_0027268511__li52373941115359"></a><a name="li52373941115359"></a>Before logging in to the ECS, you must have the login password.</p>
<p id="EN-US_TOPIC_0027268511__p89681118152820">For instructions about how to obtain the password for logging in to a Windows ECS, see <a href="en-us_topic_0031107266.html">Obtaining the Password for Logging In to a Windows ECS</a>.</p>
</li><li id="EN-US_TOPIC_0027268511__li49523598111459">In the search box above the upper right corner of the ECS list, enter the ECS name, IP address, or ID, and click <span><img id="EN-US_TOPIC_0027268511__image1130062801103443" src="en-us_image_0030874275.png"></span> for search.</li><li id="EN-US_TOPIC_0027268511__li50214528111459">Locate the row containing the ECS and click <strong id="EN-US_TOPIC_0027268511__b2115867667">Remote Login</strong> in the <strong id="EN-US_TOPIC_0027268511__b1932579859">Operation</strong> column.</li><li id="EN-US_TOPIC_0027268511__li49277573111459">In the displayed <strong id="EN-US_TOPIC_0027268511__b56972969520052">Configure Keyboard Layout for Remote Login</strong> dialog box, select the keyboard that suits your language.<ul id="EN-US_TOPIC_0027268511__ul40844978111459"><li id="EN-US_TOPIC_0027268511__li32060489111459">When logging in to the ECS using VNC for the first time, select the default English keyboard. The ECS OS uses the English keyboard by default.</li><li id="EN-US_TOPIC_0027268511__li20108945111459">If you have changed the keyboard language of the ECS OS, select the keyboard language to which you have changed.</li></ul>
</li><li id="EN-US_TOPIC_0027268511__li49523598111459">In the search box above the upper right corner of the ECS list, enter the ECS name, IP address, or ID, and click <span><img id="EN-US_TOPIC_0027268511__image1130062801103443" src="en-us_image_0030874275.png"></span> for search.</li><li id="EN-US_TOPIC_0027268511__li50214528111459">Locate the row containing the ECS and click <strong id="EN-US_TOPIC_0027268511__b2033878864">Remote Login</strong> in the <strong id="EN-US_TOPIC_0027268511__b1412903977">Operation</strong> column.</li><li id="EN-US_TOPIC_0027268511__li49277573111459">In the displayed <strong id="EN-US_TOPIC_0027268511__b56972969520052">Configure Keyboard Layout for Remote Login</strong> dialog box, select the keyboard that suits your language.<ul id="EN-US_TOPIC_0027268511__ul40844978111459"><li id="EN-US_TOPIC_0027268511__li32060489111459">When logging in to the ECS using VNC for the first time, select the default English keyboard. The ECS OS uses the English keyboard by default.</li><li id="EN-US_TOPIC_0027268511__li20108945111459">If you have changed the keyboard language of the ECS OS, select the keyboard language to which you have changed.</li></ul>
<div class="fignone" id="EN-US_TOPIC_0027268511__fig46762780111459"><span class="figcap"><b>Figure 5 </b>Keyboard layout configuration</span><br><span><img id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_image198214318316" src="en-us_image_0030874270.png" title="Click to enlarge" class="imgResize"></span></div>
</li></ol><ol start="8" id="EN-US_TOPIC_0027268511__ol65873268111459"><li id="EN-US_TOPIC_0027268511__li55988502111459">Click <strong id="EN-US_TOPIC_0027268511__b457488501">Remote Login</strong>.</li><li id="EN-US_TOPIC_0027268511__li34134472111459">(Optional) If you have changed the system language, in the dialog box that is displayed, click <strong id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_b2144786640211514">Remote Login</strong>.<div class="fignone" id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_fig54376817111459"><span class="figcap"><b>Figure 6 </b>Remote Login</span><br><span><img id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_image42446047111459" src="en-us_image_0030874271.png" title="Click to enlarge" class="imgResize"></span></div>
</li></ol><ol start="8" id="EN-US_TOPIC_0027268511__ol65873268111459"><li id="EN-US_TOPIC_0027268511__li55988502111459">Click <strong id="EN-US_TOPIC_0027268511__b597719197">Remote Login</strong>.</li><li id="EN-US_TOPIC_0027268511__li34134472111459">(Optional) If you have changed the system language, in the dialog box that is displayed, click <strong id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_b2144786640211514">Remote Login</strong>.<div class="fignone" id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_fig54376817111459"><span class="figcap"><b>Figure 6 </b>Remote Login</span><br><span><img id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_image42446047111459" src="en-us_image_0030874271.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="EN-US_TOPIC_0027268511__li56190747193213">(Optional) When the system displays "Press CTRL+ALT+DELETE to log on", click <strong id="EN-US_TOPIC_0027268511__en-us_topic_0027290684_b842352706201616_1">Send CtrlAltDel</strong> in the upper part of the remote login page to log in to the ECS.<div class="fignone" id="EN-US_TOPIC_0027268511__en-us_topic_0027290684_fig22996848191913_1"><span class="figcap"><b>Figure 7 </b>Send CtrlAltDel</span><br><span><img id="EN-US_TOPIC_0027268511__en-us_topic_0027290684_image50805371191913_1" src="en-us_image_0042322120.png"></span></div>
</li><li id="EN-US_TOPIC_0027268511__li64981560195132">(Optional) If you need your cursor to be displayed on the remote login page, click <strong id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_b16217152025520">Local Cursor</strong>.<div class="fignone" id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_fig3022163194924"><span class="figcap"><b>Figure 8 </b>Local Cursor</span><br><span><img id="EN-US_TOPIC_0027268511__en-us_topic_0027268511_en-us_topic_0036067988_image5640621116424" src="en-us_image_0036068239.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="EN-US_TOPIC_0027268511__li58839855111459">Enter the ECS password as prompted.<ul id="EN-US_TOPIC_0027268511__ul59796655111459"><li id="EN-US_TOPIC_0027268511__li1298990111459">When logging in to the ECS using VNC for the first time, use the English keyboard to enter the password. After you have logged in to the ECS, see <a href="#EN-US_TOPIC_0027268511__section66962382111459">Changing the OS Keyboard Language</a> to change the keyboard language of the ECS OS. You can then select the keyboard language and enter the password the next time you log in.</li><li id="EN-US_TOPIC_0027268511__li38109398111459">If you have changed the keyboard language of the ECS OS, ensure that the keyboard language in use, the keyboard language selected in step <a href="#EN-US_TOPIC_0027268511__li17715715111459">7</a>, and the changed OS keyboard language are all the same.</li></ul>

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<h1 class="topictitle1">Viewing ECS Metrics</h1>
<div id="body1457936836850"><div class="section" id="EN-US_TOPIC_0027371530__section11121260224613"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0027371530__p5347899515186">The cloud platform provides Cloud Eye, which monitors the running statuses of your <span id="EN-US_TOPIC_0027371530__text96741514194413">ECS</span>s. You can obtain the monitoring metrics of each <span id="EN-US_TOPIC_0027371530__text48882166414">ECS</span> on the management console.</p>
</div>
<p id="EN-US_TOPIC_0027371530__p13829195064010">There a short time delay between transmission and display of monitoring data. The status of an ECS displayed on Cloud Eye is the status obtained 5 to 10 minutes before. If an ECS is just created, wait for 5 to 10 minutes to view the real-time monitoring data.</p>
<p id="EN-US_TOPIC_0027371530__p35583124151225">There a short time delay between transmission and display of monitoring data. The status of an ECS displayed on Cloud Eye is the status obtained 5 to 10 minutes before. If an ECS is just created, wait for 5 to 10 minutes to view the real-time monitoring data.</p>
<div class="section" id="EN-US_TOPIC_0027371530__section8439794224022"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0027371530__ul3164004322451"><li id="EN-US_TOPIC_0027371530__li7011943212653">The <span id="EN-US_TOPIC_0027371530__text062781814449">ECS</span> is running properly.<p id="EN-US_TOPIC_0027371530__p48867272212653">Cloud Eye does not display the monitoring data for a stopped, faulty, or deleted <span id="EN-US_TOPIC_0027371530__text20410919204419">ECS</span>. After such an <span id="EN-US_TOPIC_0027371530__text53705205445">ECS</span> restarts or recovers, the monitoring data is available in Cloud Eye.</p>
<div class="note" id="EN-US_TOPIC_0027371530__note5028177721282"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0027371530__p35919634212751">Cloud Eye discontinues monitoring <span id="EN-US_TOPIC_0027371530__text2021072174413">ECS</span>s that remain in <strong id="EN-US_TOPIC_0027371530__b1315591017585">Stopped</strong> or <strong id="EN-US_TOPIC_0027371530__b17651313175812">Faulty</strong> state for 24 hours and removes them from the monitoring list. However, the alarm rules for such <span id="EN-US_TOPIC_0027371530__text1437682812584">ECS</span>s are not automatically deleted.</p>
</div></div>
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</li><li id="EN-US_TOPIC_0027371530__li6253115215042">The target <span id="EN-US_TOPIC_0027371530__text1764222384412">ECS</span> has been properly running for at least 10 minutes.<p id="EN-US_TOPIC_0027371530__p4456900815042">The monitoring data and graphics are available for a new <span id="EN-US_TOPIC_0027371530__text334910241445">ECS</span> after the <span id="EN-US_TOPIC_0027371530__text19556153795919">ECS</span> runs for at least 10 minutes.</p>
</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0027371530__section44667294224513"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0027371530__ol52641911224530"><li id="EN-US_TOPIC_0027371530__li4015157224530">Log in to the management console.</li><li id="EN-US_TOPIC_0027371530__li464234814566">Click <span><img id="EN-US_TOPIC_0027371530__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0027371530__li36136418224530">Under <strong id="EN-US_TOPIC_0027371530__b97231010119"><span id="EN-US_TOPIC_0027371530__text0723809114">Computing</span></strong>, click <strong id="EN-US_TOPIC_0027371530__b19724809110">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0027371530__li56082099224530">In the search box above the upper right corner of the <span id="EN-US_TOPIC_0027371530__text689872554419">ECS</span> list, enter the <span id="EN-US_TOPIC_0027371530__text32966585590">ECS</span> name, IP address, or ID for search.</li><li id="EN-US_TOPIC_0027371530__li46356152224530">Click the name of the target <span id="EN-US_TOPIC_0027371530__text3112012019">ECS</span>. The page providing details about the <span id="EN-US_TOPIC_0027371530__text554019020">ECS</span> is displayed.</li><li id="EN-US_TOPIC_0027371530__li63860846224530">Click the <strong id="EN-US_TOPIC_0027371530__b384015217013">Monitoring</strong> tab to view the monitoring data.</li><li id="EN-US_TOPIC_0027371530__li327952315319">In the <span id="EN-US_TOPIC_0027371530__text152439289442">ECS</span> monitoring area, select a duration to view the monitoring data.<p id="EN-US_TOPIC_0027371530__p1627202510306">You can view the monitoring data of the <span id="EN-US_TOPIC_0027371530__text109301628194413">ECS</span> in the last 1, 3, or 12 hours.</p>
<div class="section" id="EN-US_TOPIC_0027371530__section44667294224513"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0027371530__ol52641911224530"><li id="EN-US_TOPIC_0027371530__li4015157224530">Log in to the management console.</li><li id="EN-US_TOPIC_0027371530__li464234814566">Click <span><img id="EN-US_TOPIC_0027371530__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0027371530__li36136418224530">Under <strong id="EN-US_TOPIC_0027371530__b7351131423410"><span id="EN-US_TOPIC_0027371530__text1835151493420">Computing</span></strong>, click <strong id="EN-US_TOPIC_0027371530__b11351141420348">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0027371530__li56082099224530">In the search box above the upper right corner of the <span id="EN-US_TOPIC_0027371530__text689872554419">ECS</span> list, enter the <span id="EN-US_TOPIC_0027371530__text32966585590">ECS</span> name, IP address, or ID for search.</li><li id="EN-US_TOPIC_0027371530__li46356152224530">Click the name of the target <span id="EN-US_TOPIC_0027371530__text3112012019">ECS</span>. The page providing details about the <span id="EN-US_TOPIC_0027371530__text554019020">ECS</span> is displayed.</li><li id="EN-US_TOPIC_0027371530__li63860846224530">Click the <strong id="EN-US_TOPIC_0027371530__b384015217013">Monitoring</strong> tab to view the monitoring data.</li><li id="EN-US_TOPIC_0027371530__li327952315319">In the <span id="EN-US_TOPIC_0027371530__text152439289442">ECS</span> monitoring area, select a duration to view the monitoring data.<p id="EN-US_TOPIC_0027371530__p1627202510306">You can view the monitoring data of the <span id="EN-US_TOPIC_0027371530__text109301628194413">ECS</span> in the last 1 hour, last 3 hours, last 12 hours, last 1 day, or last 7 days.</p>
</li></ol>
</div>
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<h1 class="topictitle1">Can an ECS Without an EIP Bound Access the Internet?</h1>
<div id="body1462258683339"><p id="EN-US_TOPIC_0030013188__p952982715405">Yes.</p>
<ul id="EN-US_TOPIC_0030013188__ul7474103416333"><li id="EN-US_TOPIC_0030013188__li647416348336">Method 1: Configure a SNAT server.<p id="EN-US_TOPIC_0030013188__p153115102379"><a name="EN-US_TOPIC_0030013188__li647416348336"></a><a name="li647416348336"></a>You can configure the SNAT server so that the ECS without an EIP bound can access the Internet.</p>
<p id="EN-US_TOPIC_0030013188__p91951736113914">For details, see <a href="https://docs.otc.t-systems.com/en-us/usermanual/vpc/vpc_route_0004.html" target="_blank" rel="noopener noreferrer">"Configuring an SNAT Server"</a> in <em id="EN-US_TOPIC_0030013188__i1644225005">Virtual Private Cloud User Guide</em>.</p>
<p id="EN-US_TOPIC_0030013188__p91951736113914">For details, see <a href="https://docs.otc.t-systems.com/en-us/usermanual/vpc/vpc_route_0004.html" target="_blank" rel="noopener noreferrer">"Configuring an SNAT Server"</a> in <em id="EN-US_TOPIC_0030013188__i1731757612">Virtual Private Cloud User Guide</em>.</p>
</li><li id="EN-US_TOPIC_0030013188__li14100173743318">Method 2: Create a NAT gateway.<p id="EN-US_TOPIC_0030013188__p6943173893214"><a name="EN-US_TOPIC_0030013188__li14100173743318"></a><a name="li14100173743318"></a>If a large number of concurrent connections are required, it is a good practice to use the NAT Gateway service provided by the cloud platform.</p>
<p id="EN-US_TOPIC_0030013188__p19505735172914">The NAT Gateway service offers the NAT function for ECSs in a VPC, allowing these ECSs to access the Internet using an EIP. For more information about NAT Gateway, see <em id="EN-US_TOPIC_0030013188__i8423526979632">NAT Gateway User Guide</em>.</p>
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<a name="EN-US_TOPIC_0030828254"></a><a name="EN-US_TOPIC_0030828254"></a>
<h1 class="topictitle1">Image Types</h1>
<div id="body8662426"><div class="section" id="EN-US_TOPIC_0030828254__en-us_topic_0027498836_section6105436615564"><h4 class="sectiontitle">What Is Image?</h4><p id="EN-US_TOPIC_0030828254__p5290031521543">An image is an <span id="EN-US_TOPIC_0030828254__text169521139133911">ECS</span> template that contains an OS and may also contain proprietary software and application software, such as database software. You can use images to create <span id="EN-US_TOPIC_0030828254__text17412026105012">ECS</span>s.</p>
<p id="EN-US_TOPIC_0030828254__en-us_topic_0027498836_p37701211163751">Images can be public or private. Public images are provided by the system by default, and private images are manually created. You can use any type of image to create an <span id="EN-US_TOPIC_0030828254__text144644919398">ECS</span>. You can also create a private image using an existing <span id="EN-US_TOPIC_0030828254__text1397395119390">ECS</span> or external image. This provides you with a simple and fast way to create <span id="EN-US_TOPIC_0030828254__text4488175403915">ECS</span>s tailored to your needs. For example, if you use web services, your image can contain web server configurations, static configurations, and dynamic page code. After you use this image to create an <span id="EN-US_TOPIC_0030828254__text886165716394">ECS</span>, the web server will run on the newly created ECS.</p>
<div id="body8662426"><div class="section" id="EN-US_TOPIC_0030828254__en-us_topic_0027498836_section6105436615564"><h4 class="sectiontitle">What Is Image?</h4><p id="EN-US_TOPIC_0030828254__p5290031521543">An image is an <span id="EN-US_TOPIC_0030828254__text169521139133911">ECS</span> template that contains an OS. It may also contain proprietary software and application software, such as database software. You can use images to create <span id="EN-US_TOPIC_0030828254__text17412026105012">ECS</span>s.</p>
<p id="EN-US_TOPIC_0030828254__en-us_topic_0027498836_p37701211163751">Images can be public or private. Public images are provided by the system by default, and private images are manually created. You can use any type of image to create an <span id="EN-US_TOPIC_0030828254__text144644919398">ECS</span>. You can also create a private image using an existing <span id="EN-US_TOPIC_0030828254__text1397395119390">ECS</span> or external image. This provides you with a simple and fast way to create <span id="EN-US_TOPIC_0030828254__text4488175403915">ECS</span>s tailored to your needs. For example, if you use web services, your image can contain web server configurations, static configurations, and dynamic page code. After you use this image to create an <span id="EN-US_TOPIC_0030828254__text886165716394">ECS</span>, the web server will run on the created ECS.</p>
</div>
<div class="section" id="EN-US_TOPIC_0030828254__en-us_topic_0027498836_section31040989164158"><h4 class="sectiontitle">Image Types</h4>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0030828254__en-us_topic_0027498836_table25967296164224" frame="border" border="1" rules="all"><thead align="left"><tr id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_en-us_topic_0029124570_en-us_topic_0029124523_row6204106512614"><th align="left" class="cellrowborder" valign="top" width="18.990000000000002%" id="mcps1.3.2.2.1.3.1.1"><p id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_en-us_topic_0029124570_en-us_topic_0029124523_p5927036212614">Image Type</p>
@ -13,7 +13,7 @@
</thead>
<tbody><tr id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_en-us_topic_0029124570_en-us_topic_0029124523_row4408748812614"><td class="cellrowborder" valign="top" width="18.990000000000002%" headers="mcps1.3.2.2.1.3.1.1 "><p id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_en-us_topic_0029124570_en-us_topic_0029124523_p1431680712614"><span class="keyword" id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_keyword1411468221151522">Public image</span></p>
</td>
<td class="cellrowborder" valign="top" width="81.01%" headers="mcps1.3.2.2.1.3.1.2 "><p id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_en-us_topic_0029124570_en-us_topic_0029124523_p1881068112614">A public image is a standard, widely used image. It contains an OS and preinstalled public applications and is available to all users. Public images are very stable and their OS and any included software have been officially authorized for use. If a public image does not contain the application environments or software you need, you can use a public image to create an ECS and then deploy required software as needed.</p>
<td class="cellrowborder" valign="top" width="81.01%" headers="mcps1.3.2.2.1.3.1.2 "><p id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_en-us_topic_0029124570_en-us_topic_0029124523_p1881068112614">A public image is a standard, widely used image. It contains an OS and preinstalled public applications and is available to all users. Public images are very stable and their OS and any included software have been officially authorized for use. If a public image does not contain the environments or software you need, you can use a public image to create an ECS and then deploy the required environments or software on it.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_en-us_topic_0029124570_en-us_topic_0029124523_row3507840712614"><td class="cellrowborder" valign="top" width="18.990000000000002%" headers="mcps1.3.2.2.1.3.1.1 "><p id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_en-us_topic_0029124570_en-us_topic_0029124523_p2277869512614"><span class="keyword" id="EN-US_TOPIC_0030828254__en-us_topic_0013901609_keyword1056511395151512">Private image</span></p>

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<div id="body8662426"><div class="section" id="EN-US_TOPIC_0030828256__section134415526532"><h4 class="sectiontitle">What Is Elastic Volume Service?</h4><p id="EN-US_TOPIC_0030828256__p5516112016229">Elastic Volume Service (EVS) offers scalable block storage for <span id="EN-US_TOPIC_0030828256__text169521139133911">ECS</span>s. With high reliability, high performance, and rich specifications, EVS disks can be used for distributed file systems, development and test environments, data warehouse applications, and high-performance computing (HPC) scenarios to meet diverse service requirements.</p>
</div>
<div class="section" id="EN-US_TOPIC_0030828256__section60010917143352"><h4 class="sectiontitle">Disk Types</h4><p id="EN-US_TOPIC_0030828256__p527152612594">EVS disk types differ in performance. Choose the disk type based on your requirements.</p>
<p id="EN-US_TOPIC_0030828256__p319318211216">For more information about EVS disk specifications and performance, see "Disk Types and Performance" in the <em id="EN-US_TOPIC_0030828256__i1252110812487">Elastic Volume Service User Guide</em>.</p>
<p id="EN-US_TOPIC_0030828256__p319318211216">For more information about EVS disk specifications and performance, see "Disk Types and Performance".</p>
</div>
<div class="section" id="EN-US_TOPIC_0030828256__section64489635143430"><h4 class="sectiontitle">Device Types</h4><div class="p" id="EN-US_TOPIC_0030828256__en-us_topic_0044524737_p34112123101858">EVS disks have two device types, Virtual Block Device (VBD) and Small Computer System Interface (SCSI).<ul id="EN-US_TOPIC_0030828256__en-us_topic_0044524737_en-us_topic_0052554220_ul3420094547"><li id="EN-US_TOPIC_0030828256__li10683144144344">VBD<p id="EN-US_TOPIC_0030828256__p30971269144345"><a name="EN-US_TOPIC_0030828256__li10683144144344"></a><a name="li10683144144344"></a>When you create an EVS disk on the management console, <strong id="EN-US_TOPIC_0030828256__b842352706183944">Device Type</strong> of the EVS disk is VBD by default. VBD EVS disks support only simple SCSI read/write commands.</p>
</li><li id="EN-US_TOPIC_0030828256__li13472368144348">SCSI<p id="EN-US_TOPIC_0030828256__p44947298144349"><a name="EN-US_TOPIC_0030828256__li13472368144348"></a><a name="li13472368144348"></a>You can create EVS disks whose <strong id="EN-US_TOPIC_0030828256__b842352706145311">Device Type</strong> is SCSI on the management console. These EVS disks support transparent SCSI command transmission, allowing <span id="EN-US_TOPIC_0030828256__text1239371654017">ECS</span> OS to directly access underlying storage media. SCSI EVS disks support both basic and advanced SCSI commands.</p>

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<div class="fignone" id="EN-US_TOPIC_0030828257__fig15314318474"><span class="figcap"><b>Figure 2 </b>Accessing the Internet using an EIP</span><br><span><img class="imgResize" id="EN-US_TOPIC_0030828257__image2143713355" src="en-us_image_0178890066.png" title="Click to enlarge"></span></div>
</div>
<div class="section" id="EN-US_TOPIC_0030828257__section9843135016217"><h4 class="sectiontitle">Network QoS</h4><p id="EN-US_TOPIC_0030828257__p2719863452">Network QoS uses basic technologies to improve the quality of network communication. A network with QoS enabled offers predictable network performance and effectively allocates network bandwidth to use network resources.</p>
<p id="EN-US_TOPIC_0030828257__p177731525134614">To obtain the QoS data of an ECS flavor, including the maximum bandwidth, assured bandwidth, maximum PPS, and NIC multi-queue, see <a href="en-us_topic_0177512565.html">ECS Specifications</a>.</p>
<p id="EN-US_TOPIC_0030828257__p177731525134614">To obtain the QoS data of an ECS flavor, including the maximum bandwidth, assured bandwidth, maximum PPS, and NIC multi-queue, see <a href="en-us_topic_0177512565.html">A Summary List of ECS Specifications</a>.</p>
<div class="p" id="EN-US_TOPIC_0030828257__p835110576352">The intranet bandwidth and PPS of an ECS are determined by its flavor.<ul id="EN-US_TOPIC_0030828257__ul123521357113516"><li id="EN-US_TOPIC_0030828257__li17352957153514">Assured intranet bandwidth: indicates the guaranteed bandwidth allocated to an ECS</li><li id="EN-US_TOPIC_0030828257__li20352457113514">Maximum intranet bandwidth: indicates the maximum bandwidth that can be allocated to an ECS</li><li id="EN-US_TOPIC_0030828257__li2352195783519">Maximum intranet PPS: indicates the maximum ECS capability in transmitting and receiving packets.</li><li id="EN-US_TOPIC_0030828257__li192851238163616">NIC multi-queue: allocates NIC interrupt requests to multiple vCPUs for higher PPS performance and bandwidth.<div class="note" id="EN-US_TOPIC_0030828257__note187491138374"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0030828257__ul1274915137378"><li id="EN-US_TOPIC_0030828257__li6749121316378">For instructions about how to test PPS, see <a href="en-us_topic_0115820205.html">How Can I Test Network Performance?</a></li><li id="EN-US_TOPIC_0030828257__li18749413163714">For instructions about how to enable NIC multi-queue, see <a href="en-us_topic_0058758453.html">Enabling NIC Multi-Queue</a>.</li></ul>
</div></div>
</li></ul>

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<a name="EN-US_TOPIC_0030828258"></a><a name="EN-US_TOPIC_0030828258"></a>
<h1 class="topictitle1">Modifying ECS vCPU and Memory Specifications</h1>
<h1 class="topictitle1">Modifying ECS Specifications</h1>
<div id="body8662426"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="en-us_topic_0013771092.html">General Operations for Modifying Specifications</a></strong><br>
<li class="ulchildlink"><strong><a href="en-us_topic_0013771092.html">General Operations</a></strong><br>
</li>
</ul>

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</thead>
<tbody><tr id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_row5601456494129"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p1205045294213">Master Boot Record (MBR)</p>
</td>
<td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p2342140694129">2 TB</p>
<td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p2342140694129">2 TiB</p>
</td>
<td class="cellrowborder" valign="top" width="41%" headers="mcps1.3.3.3.2.5.1.3 "><ul id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_ul21060408163037"><li id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_li45070926163039">4 primary partitions</li><li id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_li63482739163037">3 primary partitions and 1 extended partition</li></ul>
<div class="p" id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p723613328428">With MBR, you can create several primary partitions and one extended partition. The extended partition must be divided into logical partitions before use. For example, if 6 partitions need to be created, you can create them in the following two ways:<ul id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_ul6972172517474"><li id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_li49871396163255">3 primary partitions and 1 extended partition, with the extended partition divided into 3 logical partitions</li><li id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_li1797352519473">1 primary partition and 1 extended partition, with the extended partition divided into 5 logical partitions</li></ul>
@ -33,8 +33,8 @@
</tr>
<tr id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_row3114938294129"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p1278766394216">GUID Partition Table (GPT)</p>
</td>
<td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p2460587094129">18 EB</p>
<p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p1993019393474">1 EB = 1048576 TB</p>
<td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p2460587094129">18 EiB</p>
<p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p1993019393474">1 EiB = 1048576 TiB</p>
</td>
<td class="cellrowborder" valign="top" width="41%" headers="mcps1.3.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p4691841694129">Unlimited</p>
<p id="EN-US_TOPIC_0030831623__en-us_topic_0085245975_p12599114794712">Disk partitions created using GPT are not categorized.</p>

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<ul id="EN-US_TOPIC_0030878383__ul1499818151265"><li id="EN-US_TOPIC_0030878383__li169988152261">Inbound: Inbound rules allow external network traffic to be sent to the <span id="EN-US_TOPIC_0030878383__text6334450160">ECS</span>s in the security group.</li><li id="EN-US_TOPIC_0030878383__li1399891572612">Outbound: Outbound rules allow network traffic from the <span id="EN-US_TOPIC_0030878383__text16112155519169">ECS</span>s in the security group to be sent out of the security group.</li></ul>
<p id="EN-US_TOPIC_0030878383__p91319310819">For details about the default security group rules, see <em id="EN-US_TOPIC_0030878383__i842352697143119">Virtual Private Cloud User Guide</em>. For details about configuration examples for security group rules, see <a href="en-us_topic_0140323152.html">Security Group Configuration Examples</a>.</p>
</div>
<div class="section" id="EN-US_TOPIC_0030878383__en-us_topic_0029320966_section40712064223843"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0030878383__en-us_topic_0029320966_ol291224422402"><li id="EN-US_TOPIC_0030878383__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0030878383__li464234814566">Click <span><img id="EN-US_TOPIC_0030878383__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0029320966_li50026016224047">Under <strong id="EN-US_TOPIC_0030878383__b151740248419"><span id="EN-US_TOPIC_0030878383__text111748249418">Computing</span></strong>, click <strong id="EN-US_TOPIC_0030878383__b217515246414">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0030878383__li34401539214315">On the <strong id="EN-US_TOPIC_0030878383__b9251123218404">Elastic Cloud Server</strong> page, click the name of the target <span id="EN-US_TOPIC_0030878383__text10144144802310">ECS</span>.<p id="EN-US_TOPIC_0030878383__p19982029214319">The page providing details about the <span id="EN-US_TOPIC_0030878383__text826344194018">ECS</span> is displayed.</p>
<div class="section" id="EN-US_TOPIC_0030878383__en-us_topic_0029320966_section40712064223843"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0030878383__en-us_topic_0029320966_ol291224422402"><li id="EN-US_TOPIC_0030878383__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0030878383__li464234814566">Click <span><img id="EN-US_TOPIC_0030878383__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0029320966_li50026016224047">Under <strong id="EN-US_TOPIC_0030878383__b1135134817372"><span id="EN-US_TOPIC_0030878383__text23511048153715">Computing</span></strong>, click <strong id="EN-US_TOPIC_0030878383__b13351134815371">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0030878383__li34401539214315">On the <strong id="EN-US_TOPIC_0030878383__b9251123218404">Elastic Cloud Server</strong> page, click the name of the target <span id="EN-US_TOPIC_0030878383__text10144144802310">ECS</span>.<p id="EN-US_TOPIC_0030878383__p19982029214319">The page providing details about the <span id="EN-US_TOPIC_0030878383__text826344194018">ECS</span> is displayed.</p>
</li><li id="EN-US_TOPIC_0030878383__li45534692214355">Click the <strong id="EN-US_TOPIC_0030878383__b8423527069595">Security Groups</strong> tab, expand the information of the security group, and view security group rules.</li><li id="EN-US_TOPIC_0030878383__li2997365821442">Click the security group ID.<p id="EN-US_TOPIC_0030878383__p5857465521443"><a name="EN-US_TOPIC_0030878383__li2997365821442"></a><a name="li2997365821442"></a>The system automatically switches to the security group details page.</p>
</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0029320966_li110100322530">On the <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1458122962419">Inbound Rules</strong> tab, click <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b84235270615562">Add Rule</strong>. In the displayed dialog box, set required parameters to add an inbound rule.<p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p10544530320">You can click <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b84235270617413">+</strong> to add more inbound rules.</p>
<div class="fignone" id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_fig1786518124129"><span class="figcap"><b>Figure 1 </b>Add Inbound Rule</span><br><span><img id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_image186617129126" src="en-us_image_0284920908.png" title="Click to enlarge" class="imgResize"></span></div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_table111445216564" width="90%" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Inbound rule parameter description</caption><thead align="left"><tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row1811565205613"><th align="left" class="cellrowborder" valign="top" width="12.55%" id="mcps1.3.2.2.7.5.2.4.1.1"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p51151452125620"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b2050942514">Parameter</strong></p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_table111445216564" width="90%" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Inbound rule parameter description</caption><thead align="left"><tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row1811565205613"><th align="left" class="cellrowborder" valign="top" width="12.55%" id="mcps1.3.2.2.7.5.2.4.1.1"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p51151452125620"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1533844785">Parameter</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="69.45%" id="mcps1.3.2.2.7.5.2.4.1.2"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p5115552175613"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b350217738">Description</strong></p>
<th align="left" class="cellrowborder" valign="top" width="69.45%" id="mcps1.3.2.2.7.5.2.4.1.2"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p5115552175613"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1511944916">Description</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="18%" id="mcps1.3.2.2.7.5.2.4.1.3"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p711565219563"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b984193573219">Example Value</strong></p>
</th>
@ -21,16 +21,23 @@
<tbody><tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row9115105219562"><td class="cellrowborder" rowspan="2" valign="top" width="12.55%" headers="mcps1.3.2.2.7.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p151157525565">Protocol &amp; Port</p>
<p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p3510193211510"></p>
</td>
<td class="cellrowborder" valign="top" width="69.45%" headers="mcps1.3.2.2.7.5.2.4.1.2 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1711515526562"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1939852442315">Protocol</strong>: The network protocol. Currently, the value can be <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b207485119">All</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1997702102">TCP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1330876807">UDP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b569001586">ICMP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b175264618215">GRE</strong>, or others.</p>
<td class="cellrowborder" valign="top" width="69.45%" headers="mcps1.3.2.2.7.5.2.4.1.2 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1711515526562"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1939852442315">Protocol</strong>: The network protocol. Currently, the value can be <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1872293921">All</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b2016345034">TCP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1551779593">UDP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1411609873">ICMP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b175264618215">GRE</strong>, or others.</p>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.2.2.7.5.2.4.1.3 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p193908441914">TCP</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row6510532121511"><td class="cellrowborder" valign="top" headers="mcps1.3.2.2.7.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p4115175245613"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b134441812558">Port</strong>: The port or port range over which the traffic can reach your ECS. The value ranges from 1 to 65535. </p>
<tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row6510532121511"><td class="cellrowborder" valign="top" headers="mcps1.3.2.2.7.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p4115175245613"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b20578501637">Port</strong>: The port or port range over which the traffic can reach your ECS. The value ranges from 1 to 65535. </p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.2.7.5.2.4.1.2 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1551023251511">22, or 22-30</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row25141647204911"><td class="cellrowborder" valign="top" width="12.55%" headers="mcps1.3.2.2.7.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1495104820492">Type</p>
</td>
<td class="cellrowborder" valign="top" width="69.45%" headers="mcps1.3.2.2.7.5.2.4.1.2 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p2951114864918">IPv4</p>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.2.2.7.5.2.4.1.3 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p14951144820496">IPv4</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row511615528561"><td class="cellrowborder" valign="top" width="12.55%" headers="mcps1.3.2.2.7.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p86899991813">Source</p>
</td>
<td class="cellrowborder" valign="top" width="69.45%" headers="mcps1.3.2.2.7.5.2.4.1.2 "><div class="p" id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p18116175212564">The source of the security group rule. The value can be a single IP address or a security group to allow access from IP addresses or instances in the security group. For example:<ul id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_ul12116352195619"><li id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_li18391357452">xxx.xxx.xxx.xxx/32 (IPv4 address)</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_li6529544124510">xxx.xxx.xxx.0/24 (IPv4 address range)</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_li06004484454">0.0.0.0/0 (all IPv4 addresses)</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_li1611612527567">sg-abc (security group)</li></ul>
@ -51,12 +58,12 @@
</tbody>
</table>
</div>
</li><li id="EN-US_TOPIC_0030878383__li114871417141">On the <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b663618586245">Outbound Rules</strong> tab, click <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b431308581">Add Rule</strong>. In the displayed dialog box, set required parameters to add an outbound rule.<p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p161151454111115">You can click <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b842352706174116">+</strong> to add more outbound rules.</p>
</li><li id="EN-US_TOPIC_0030878383__li114871417141">On the <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b663618586245">Outbound Rules</strong> tab, click <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1886644711">Add Rule</strong>. In the displayed dialog box, set required parameters to add an outbound rule.<p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p161151454111115">You can click <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b842352706174116">+</strong> to add more outbound rules.</p>
<div class="fignone" id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_fig11809848184019"><span class="figcap"><b>Figure 2 </b>Add Outbound Rule</span><br><span><img id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_image138102048204017" src="en-us_image_0284993717.png" title="Click to enlarge" class="imgResize"></span></div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_table0614192319232" width="90%" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Outbound rule parameter description</caption><thead align="left"><tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row19614623202312"><th align="left" class="cellrowborder" valign="top" width="12.55%" id="mcps1.3.2.2.8.5.2.4.1.1"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p361592319230"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1986520175">Parameter</strong></p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_table0614192319232" width="90%" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Outbound rule parameter description</caption><thead align="left"><tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row19614623202312"><th align="left" class="cellrowborder" valign="top" width="12.55%" id="mcps1.3.2.2.8.5.2.4.1.1"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p361592319230"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b584976601">Parameter</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="69.45%" id="mcps1.3.2.2.8.5.2.4.1.2"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1961514231232"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1993881696">Description</strong></p>
<th align="left" class="cellrowborder" valign="top" width="69.45%" id="mcps1.3.2.2.8.5.2.4.1.2"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1961514231232"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b107750324">Description</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="18%" id="mcps1.3.2.2.8.5.2.4.1.3"><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1061552372311"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b78071625745">Example Value</strong></p>
</th>
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<tbody><tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row76161523132311"><td class="cellrowborder" rowspan="2" valign="top" width="12.55%" headers="mcps1.3.2.2.8.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1761652313238">Protocol &amp; Port</p>
<p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p4616323182310"></p>
</td>
<td class="cellrowborder" valign="top" width="69.45%" headers="mcps1.3.2.2.8.5.2.4.1.2 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1461632352313"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b114706499477">Protocol</strong>: The network protocol. Currently, the value can be <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b232398203">All</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b735720881">TCP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b805247904">UDP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b798891392">ICMP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b386710031">GRE</strong>, or others.</p>
<td class="cellrowborder" valign="top" width="69.45%" headers="mcps1.3.2.2.8.5.2.4.1.2 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1461632352313"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b114706499477">Protocol</strong>: The network protocol. Currently, the value can be <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b793362057">All</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b207321097">TCP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b1762318139">UDP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b359705571">ICMP</strong>, <strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b66980248">GRE</strong>, or others.</p>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.2.2.8.5.2.4.1.3 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p157082238193">TCP</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row5616723112313"><td class="cellrowborder" valign="top" headers="mcps1.3.2.2.8.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p761613239235"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b942314575568">Port</strong>: The port or port range over which the traffic can leave your ECS. The value ranges from 1 to 65535. </p>
<tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row5616723112313"><td class="cellrowborder" valign="top" headers="mcps1.3.2.2.8.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p761613239235"><strong id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_b385627877">Port</strong>: The port or port range over which the traffic can leave your ECS. The value ranges from 1 to 65535. </p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.2.8.5.2.4.1.2 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p12616182311235">22, or 22-30</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row1691735914544"><td class="cellrowborder" valign="top" width="12.55%" headers="mcps1.3.2.2.8.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p554315114557">Type</p>
</td>
<td class="cellrowborder" valign="top" width="69.45%" headers="mcps1.3.2.2.8.5.2.4.1.2 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p105437145520">IPv4</p>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.2.2.8.5.2.4.1.3 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p1554319175510">IPv4</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_row2617112315232"><td class="cellrowborder" valign="top" width="12.55%" headers="mcps1.3.2.2.8.5.2.4.1.1 "><p id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p15617623172315">Destination</p>
</td>
<td class="cellrowborder" valign="top" width="69.45%" headers="mcps1.3.2.2.8.5.2.4.1.2 "><div class="p" id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_p196171823152315">The destination of the security group rule. The value can be a single IP address or a security group to allow access to IP addresses or instances in the security group. For example:<ul id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_ul16177237233"><li id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_li8617323202310">xxx.xxx.xxx.xxx/32 (IPv4 address)</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_li10617152312231">xxx.xxx.xxx.0/24 (IPv4 address range)</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_li206171823182318">0.0.0.0/0 (all IPv4 addresses)</li><li id="EN-US_TOPIC_0030878383__en-us_topic_0118534005_li6930529354">sg-abc (security group)</li></ul>

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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="en-us_topic_0039588795.html">Viewing ECS Creation Statuses</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="en-us_topic_0108255889.html">Viewing Failures</a></strong><br>
<li class="ulchildlink"><strong><a href="en-us_topic_0108255889.html">Viewing Failure Tasks</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="en-us_topic_0017130261.html">Viewing Details About an ECS</a></strong><br>
</li>

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<div id="body1464342274212"><div class="section" id="EN-US_TOPIC_0031107266__section83915017466"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0031107266__p5548482995849">Password authentication is required to log in to a Windows <span id="EN-US_TOPIC_0031107266__text2418174235815">ECS</span>. Therefore, you must use the key file used when you created the <span id="EN-US_TOPIC_0031107266__text9971154710587">ECS</span> to obtain the administrator password generated during <span id="EN-US_TOPIC_0031107266__text120830195810">ECS</span> creation. The administrator user is <strong id="EN-US_TOPIC_0031107266__b2049513373585">Administrator</strong> or the user configured using Cloudbase-Init. This password is randomly generated, offering high security.</p>
<p id="EN-US_TOPIC_0031107266__p703221995027">You can obtain the initial password for logging in to a Windows <span id="EN-US_TOPIC_0031107266__text66814149599">ECS</span> through the management console or APIs. For details, see this section.</p>
</div>
<div class="section" id="EN-US_TOPIC_0031107266__section38475220193847"><h4 class="sectiontitle">Obtaining the Password Through the Management Console</h4><ol id="EN-US_TOPIC_0031107266__ol5405292620557"><li id="EN-US_TOPIC_0031107266__li584178495530">Obtain the private key file (.pem file) used when you created the <span id="EN-US_TOPIC_0031107266__text136800010221">ECS</span>.</li><li id="EN-US_TOPIC_0031107266__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0031107266__li464234814566">Click <span><img id="EN-US_TOPIC_0031107266__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0031107266__en-us_topic_0029320966_li40039532224047">Under <strong id="EN-US_TOPIC_0031107266__b1270110994914"><span id="EN-US_TOPIC_0031107266__text370109104910">Computing</span></strong>, click <strong id="EN-US_TOPIC_0031107266__b12702109164919">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0031107266__en-us_topic_0029320966_li24833369224047">On the <strong id="EN-US_TOPIC_0031107266__b577318918018">Elastic Cloud Server</strong> page, select the target <span id="EN-US_TOPIC_0031107266__text11584529221">ECS</span>.</li><li id="EN-US_TOPIC_0031107266__li46427097215215">In the <strong id="EN-US_TOPIC_0031107266__b1111735779">Operation</strong> column, click <strong id="EN-US_TOPIC_0031107266__b425181927">More</strong> and select <strong id="EN-US_TOPIC_0031107266__b1760452971">Get Password</strong>.</li><li id="EN-US_TOPIC_0031107266__li50525424215555">Use either of the following methods to obtain the password through the key file:<ul id="EN-US_TOPIC_0031107266__ul6527186921565"><li id="EN-US_TOPIC_0031107266__li1887355017131">Click <strong id="EN-US_TOPIC_0031107266__b842352706144939">Select File</strong> and upload the key file from a local directory.</li><li id="EN-US_TOPIC_0031107266__li42486460215639">Copy the key file content to the text field.</li></ul>
<div class="section" id="EN-US_TOPIC_0031107266__section38475220193847"><h4 class="sectiontitle">Obtaining the Password Through the Management Console</h4><ol id="EN-US_TOPIC_0031107266__ol5405292620557"><li id="EN-US_TOPIC_0031107266__li584178495530">Obtain the private key file (.pem file) used when you created the <span id="EN-US_TOPIC_0031107266__text136800010221">ECS</span>.</li><li id="EN-US_TOPIC_0031107266__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0031107266__li464234814566">Click <span><img id="EN-US_TOPIC_0031107266__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0031107266__en-us_topic_0029320966_li40039532224047">Under <strong id="EN-US_TOPIC_0031107266__b52081541033"><span id="EN-US_TOPIC_0031107266__text82071840315">Computing</span></strong>, click <strong id="EN-US_TOPIC_0031107266__b2020864138">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0031107266__en-us_topic_0029320966_li24833369224047">On the <strong id="EN-US_TOPIC_0031107266__b577318918018">Elastic Cloud Server</strong> page, select the target <span id="EN-US_TOPIC_0031107266__text11584529221">ECS</span>.</li><li id="EN-US_TOPIC_0031107266__li46427097215215">In the <strong id="EN-US_TOPIC_0031107266__b1366792849">Operation</strong> column, click <strong id="EN-US_TOPIC_0031107266__b964645198">More</strong> and select <strong id="EN-US_TOPIC_0031107266__b398937099">Get Password</strong>.</li><li id="EN-US_TOPIC_0031107266__li50525424215555">Use either of the following methods to obtain the password through the key file:<ul id="EN-US_TOPIC_0031107266__ul6527186921565"><li id="EN-US_TOPIC_0031107266__li1887355017131">Click <strong id="EN-US_TOPIC_0031107266__b842352706144939">Select File</strong> and upload the key file from a local directory.</li><li id="EN-US_TOPIC_0031107266__li42486460215639">Copy the key file content to the text field.</li></ul>
</li><li id="EN-US_TOPIC_0031107266__li18672759215816">Click <strong id="EN-US_TOPIC_0031107266__b102668266317244">Get Password</strong> to obtain a random password.</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0031107266__section1118765310423"><h4 class="sectiontitle">Obtaining the Password Through APIs</h4><ol id="EN-US_TOPIC_0031107266__ol507546510433"><li id="EN-US_TOPIC_0031107266__li17213488101942">Obtain the private key file (.pem file) used when you created the <span id="EN-US_TOPIC_0031107266__text356411314017">ECS</span>.</li><li id="EN-US_TOPIC_0031107266__li1110886810299">Set up the API calling environment.</li><li id="EN-US_TOPIC_0031107266__li54866977184131">Call APIs. For details, see <a href="https://docs.otc.t-systems.com/api/ecs/en-us_topic_0020805967.html" target="_blank" rel="noopener noreferrer">API Usage Guidelines</a> in <em id="EN-US_TOPIC_0031107266__i84235269711913">Elastic Cloud Server API Reference</em>.</li><li id="EN-US_TOPIC_0031107266__li5770130102852"><a name="EN-US_TOPIC_0031107266__li5770130102852"></a><a name="li5770130102852"></a>Obtain the ciphertext password.<p id="EN-US_TOPIC_0031107266__p44462590102854"><a name="EN-US_TOPIC_0031107266__li5770130102852"></a><a name="li5770130102852"></a>Call the password obtaining APIs to obtain the ciphertext password of the public key encrypted using RSA. The API URI is in the format "GET /v2/{<em id="EN-US_TOPIC_0031107266__i842352697152819">tenant_id</em>}/servers/{<em id="EN-US_TOPIC_0031107266__i842352697152825">server_id</em>}/os-server-password".</p>

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<div id="body1464342274213"><div class="section" id="EN-US_TOPIC_0031107267__section39747844174914"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0031107267__p430025032259">After you obtain the initial password, it is a good practice to delete it to ensure system security.</p>
<p id="EN-US_TOPIC_0031107267__p5287502922531">Deleting the initial password does not affect <span id="EN-US_TOPIC_0031107267__text12833918122219">ECS</span> operation or login. Once deleted, the password cannot be retrieved. Before you delete a password, it is a good practice to record it.</p>
</div>
<div class="section" id="EN-US_TOPIC_0031107267__section2644336121598"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0031107267__ol5405292620557"><li id="EN-US_TOPIC_0031107267__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0031107267__li464234814566">Click <span><img id="EN-US_TOPIC_0031107267__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0031107267__en-us_topic_0029320966_li40039532224047">Under <strong id="EN-US_TOPIC_0031107267__b18298193517572"><span id="EN-US_TOPIC_0031107267__text1729813355573">Computing</span></strong>, click <strong id="EN-US_TOPIC_0031107267__b8298735145713">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0031107267__en-us_topic_0029320966_li24833369224047">On the <strong id="EN-US_TOPIC_0031107267__b165659201067">Elastic Cloud Server</strong> page, select the target <span id="EN-US_TOPIC_0031107267__text105654207620">ECS</span>.</li><li id="EN-US_TOPIC_0031107267__li46427097215215">In the <strong id="EN-US_TOPIC_0031107267__b84235270612174">Operation</strong> column, click <strong id="EN-US_TOPIC_0031107267__b84235270612177">More</strong> and select <strong id="EN-US_TOPIC_0031107267__b842352706121710">Delete Password</strong>.<p id="EN-US_TOPIC_0031107267__p9631509215432">The system displays a message, asking you whether you want to delete the password.</p>
<div class="section" id="EN-US_TOPIC_0031107267__section2644336121598"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0031107267__ol5405292620557"><li id="EN-US_TOPIC_0031107267__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0031107267__li464234814566">Click <span><img id="EN-US_TOPIC_0031107267__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0031107267__en-us_topic_0029320966_li40039532224047">Under <strong id="EN-US_TOPIC_0031107267__b85628451063"><span id="EN-US_TOPIC_0031107267__text1856112456610">Computing</span></strong>, click <strong id="EN-US_TOPIC_0031107267__b1456211451167">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0031107267__en-us_topic_0029320966_li24833369224047">On the <strong id="EN-US_TOPIC_0031107267__b165659201067">Elastic Cloud Server</strong> page, select the target <span id="EN-US_TOPIC_0031107267__text105654207620">ECS</span>.</li><li id="EN-US_TOPIC_0031107267__li46427097215215">In the <strong id="EN-US_TOPIC_0031107267__b84235270612174">Operation</strong> column, click <strong id="EN-US_TOPIC_0031107267__b84235270612177">More</strong> and select <strong id="EN-US_TOPIC_0031107267__b842352706121710">Delete Password</strong>.<p id="EN-US_TOPIC_0031107267__p9631509215432">The system displays a message, asking you whether you want to delete the password.</p>
</li><li id="EN-US_TOPIC_0031107267__li18672759215816">Click <strong id="EN-US_TOPIC_0031107267__b842352706145910">OK</strong> to delete the password.</li></ol>
</div>
</div>

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<a name="EN-US_TOPIC_0031523135"></a><a name="EN-US_TOPIC_0031523135"></a>
<h1 class="topictitle1">Changing the OS</h1>
<div id="body1465299569106"><div class="section" id="EN-US_TOPIC_0031523135__section44633721195915"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0031523135__p393121161518">Changing an <span id="EN-US_TOPIC_0031523135__text4778336112417">ECS</span> OS will change the system disk attached to the <span id="EN-US_TOPIC_0031523135__text114055388016">ECS</span>. After the changing, the system disk ID of the <span id="EN-US_TOPIC_0031523135__text88756374246">ECS</span> will be changed, and the original system disk will be deleted.</p>
<div id="body1465299569106"><div class="section" id="EN-US_TOPIC_0031523135__section44633721195915"><h4 class="sectiontitle">Scenarios</h4><p id="EN-US_TOPIC_0031523135__p393121161518">Changing an <span id="EN-US_TOPIC_0031523135__text4778336112417">ECS</span> OS will change the system disk attached to the <span id="EN-US_TOPIC_0031523135__text114055388016">ECS</span>. After the change, the system disk ID of the <span id="EN-US_TOPIC_0031523135__text88756374246">ECS</span> will be changed, and the original system disk will be deleted.</p>
<p id="EN-US_TOPIC_0031523135__p1161765124318">If the OS running on an <span id="EN-US_TOPIC_0031523135__text1975123916248">ECS</span> cannot meet service requirements, change the <span id="EN-US_TOPIC_0031523135__text10604694117">ECS</span> OS.</p>
<p id="EN-US_TOPIC_0031523135__p116185911858">The cloud platform supports changing between image types (public images, private images, and shared images) and between OSs. You can change your OS by changing your ECS image.</p>
</div>
@ -11,15 +11,15 @@
</li></ul>
<ul id="EN-US_TOPIC_0031523135__ul18707673284"><li id="EN-US_TOPIC_0031523135__li10954135083316">The system disk capacity of an <span id="EN-US_TOPIC_0031523135__text109953488248">ECS</span> with OS changed may change because the system disk capacity specified by the image of the changed OS may be changed.</li><li id="EN-US_TOPIC_0031523135__li14700191710294">You can choose to encrypt the system disk of an ECS during OS change.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0031523135__section1852122261012"><h4 class="sectiontitle">Notes on Change Between Different OSs</h4><p id="EN-US_TOPIC_0031523135__p18122171781114">Change between different OSs indicates that the OS is changed between Windows and Linux.</p>
<ul id="EN-US_TOPIC_0031523135__ul465265720559"><li id="EN-US_TOPIC_0031523135__li116521157105519">To change Windows to Linux, install an NTFS partition tool, such as NTFS-3G for data reading and writing on the Windows ECS.</li><li id="EN-US_TOPIC_0031523135__li1865219579552">To change Linux to Windows, install software, such as Ext2Read or Ext2Fsd to identify ext3 or ext4.<div class="note" id="EN-US_TOPIC_0031523135__note1024618431261"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0031523135__p324654313618">You are not advised to change Linux to Window on the cloud platform. The reason is as follows: If there are LVM partitions on the Linux ECS, these partitions may fail after the OS is changed to Windows.</p>
<div class="section" id="EN-US_TOPIC_0031523135__section1852122261012"><h4 class="sectiontitle">Notes on Change Between Windows and Linux</h4><p id="EN-US_TOPIC_0031523135__p18122171781114">Change between different OSs indicates that the OS is changed between Windows and Linux.</p>
<ul id="EN-US_TOPIC_0031523135__ul465265720559"><li id="EN-US_TOPIC_0031523135__li116521157105519">To change Windows to Linux, install an NTFS partition tool, such as NTFS-3G for data reads and writes on the Windows ECS.</li><li id="EN-US_TOPIC_0031523135__li1865219579552">To change Linux to Windows, install software, such as Ext2Read or Ext2Fsd to identify ext3 or ext4.<div class="note" id="EN-US_TOPIC_0031523135__note1024618431261"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0031523135__p324654313618">If there are LVM partitions on the Linux ECS, these partitions may fail after the OS is changed to Windows. Therefore, a change from Linux to Windows is not recommended.</p>
</div></div>
</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0031523135__section10065433195938"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0031523135__ul5982276195952"><li id="EN-US_TOPIC_0031523135__li31738699195952">The target <span id="EN-US_TOPIC_0031523135__text101571750152418">ECS</span> is stopped.</li><li id="EN-US_TOPIC_0031523135__li4397542520019">The target <span id="EN-US_TOPIC_0031523135__text49488517246">ECS</span> has a system disk attached.</li><li id="EN-US_TOPIC_0031523135__li62686098144932">Necessary data has been backed up. (Changing the OS clears the data in all partitions of the system disk, including the system partition.)</li><li id="EN-US_TOPIC_0031523135__li191271414510">If the original ECS uses password authentication while the new ECS uses key pair authentication, ensure that a key pair is available.</li><li id="EN-US_TOPIC_0031523135__li19425937143519">If a private image is required for changing the ECS OS, create the desired private image by following the instructions provided in <em id="EN-US_TOPIC_0031523135__i3685165822115">Image Management Service User Guide</em>.<ul id="EN-US_TOPIC_0031523135__ul16160101111503"><li id="EN-US_TOPIC_0031523135__li112128495415">If the image of an <span id="EN-US_TOPIC_0031523135__text09165316244">ECS</span> is required, make sure that a private image has been created using the <span id="EN-US_TOPIC_0031523135__text96993218519">ECS</span>.</li><li id="EN-US_TOPIC_0031523135__li19120046204513">If a local image file is required, make sure that the image file has been imported to the cloud platform and registered as a private image.</li><li id="EN-US_TOPIC_0031523135__li1838258174613">If a private image from another region is required, make sure that the image has been copied.</li><li id="EN-US_TOPIC_0031523135__li19484544194814">If a private image from another user account is required, make sure that the image has been shared with you.</li></ul>
<div class="section" id="EN-US_TOPIC_0031523135__section10065433195938"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0031523135__ul5982276195952"><li id="EN-US_TOPIC_0031523135__li31738699195952">The target <span id="EN-US_TOPIC_0031523135__text101571750152418">ECS</span> is stopped.</li><li id="EN-US_TOPIC_0031523135__li4397542520019">The target <span id="EN-US_TOPIC_0031523135__text49488517246">ECS</span> has a system disk attached.</li><li id="EN-US_TOPIC_0031523135__li62686098144932">Necessary data has been backed up. (Changing the OS clears the data in all partitions of the system disk, including the system partition.)</li><li id="EN-US_TOPIC_0031523135__li191271414510">If the original ECS uses password authentication while the new ECS uses key pair authentication, ensure that a key pair is available.</li><li id="EN-US_TOPIC_0031523135__li19425937143519">If a private image is required for changing the ECS OS, create the desired private image by following the instructions provided in <em id="EN-US_TOPIC_0031523135__i618062511446">Image Management Service User Guide</em>.<ul id="EN-US_TOPIC_0031523135__ul16160101111503"><li id="EN-US_TOPIC_0031523135__li112128495415">If the image of an <span id="EN-US_TOPIC_0031523135__text09165316244">ECS</span> is required, make sure that a private image has been created using the <span id="EN-US_TOPIC_0031523135__text96993218519">ECS</span>.</li><li id="EN-US_TOPIC_0031523135__li19120046204513">If a local image file is required, make sure that the image file has been imported to the cloud platform and registered as a private image.</li><li id="EN-US_TOPIC_0031523135__li1838258174613">If a private image from another region is required, make sure that the image has been copied.</li><li id="EN-US_TOPIC_0031523135__li19484544194814">If a private image from another user account is required, make sure that the image has been shared with you.</li></ul>
</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0031523135__section208284422018"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0031523135__ol6031768220119"><li id="EN-US_TOPIC_0031523135__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0031523135__li464234814566">Click <span><img id="EN-US_TOPIC_0031523135__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li45082966143628"><a name="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li45082966143628"></a><a name="en-us_topic_0031523135_en-us_topic_0024911405_li45082966143628"></a>Under <strong id="EN-US_TOPIC_0031523135__b16925135682315"><span id="EN-US_TOPIC_0031523135__text492565616235">Computing</span></strong>, click <strong id="EN-US_TOPIC_0031523135__b39251056172320">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0031523135__li1085462314256">Locate the row containing the target <span id="EN-US_TOPIC_0031523135__text18919411255">ECS</span>. Click <strong id="EN-US_TOPIC_0031523135__b232315336513">More</strong> in the <strong id="EN-US_TOPIC_0031523135__b1572133715513">Operation</strong> column and select <strong id="EN-US_TOPIC_0031523135__b6638114817463">Manage Image/Disk</strong> &gt; <strong id="EN-US_TOPIC_0031523135__b123641742556">Change OS</strong>.<p id="EN-US_TOPIC_0031523135__p3854122302512">Only stopped <span id="EN-US_TOPIC_0031523135__text6308195102518">ECS</span>s support OS changing. If the <span id="EN-US_TOPIC_0031523135__text7164698613">ECS</span> is not stopped, stop it before proceeding with changing.</p>
<div class="section" id="EN-US_TOPIC_0031523135__section208284422018"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0031523135__ol6031768220119"><li id="EN-US_TOPIC_0031523135__li3490190117228">Log in to the management console.</li><li id="EN-US_TOPIC_0031523135__li464234814566">Click <span><img id="EN-US_TOPIC_0031523135__en-us_topic_0014250631_image1862675853202121" src="en-us_image_0210779229.png"></span> in the upper left corner and select your region and project.</li><li id="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li45082966143628"><a name="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li45082966143628"></a><a name="en-us_topic_0031523135_en-us_topic_0024911405_li45082966143628"></a>Under <strong id="EN-US_TOPIC_0031523135__b167824054515"><span id="EN-US_TOPIC_0031523135__text27829015450">Computing</span></strong>, click <strong id="EN-US_TOPIC_0031523135__b147822074510">Elastic Cloud Server</strong>.</li><li id="EN-US_TOPIC_0031523135__li1085462314256">Locate the row containing the target <span id="EN-US_TOPIC_0031523135__text18919411255">ECS</span>. Click <strong id="EN-US_TOPIC_0031523135__b232315336513">More</strong> in the <strong id="EN-US_TOPIC_0031523135__b1572133715513">Operation</strong> column and select <strong id="EN-US_TOPIC_0031523135__b6638114817463">Manage Image/Disk/Backup</strong> &gt; <strong id="EN-US_TOPIC_0031523135__b123641742556">Change OS</strong>.<p id="EN-US_TOPIC_0031523135__p3854122302512">Only stopped <span id="EN-US_TOPIC_0031523135__text6308195102518">ECS</span>s support OS changing. If the <span id="EN-US_TOPIC_0031523135__text7164698613">ECS</span> is not stopped, stop it before proceeding with changing.</p>
</li><li id="EN-US_TOPIC_0031523135__li359341520111">Modify related <span id="EN-US_TOPIC_0031523135__text128339443259">ECS</span> parameters, such as <strong id="EN-US_TOPIC_0031523135__b157867277810">Image Type</strong> and <strong id="EN-US_TOPIC_0031523135__b16431831583">Image</strong>, based on service requirements.<p id="EN-US_TOPIC_0031523135__p4891784120112">For more details, see <a href="en-us_topic_0021831611.html">Creating an ECS</a>.</p>
</li><li id="EN-US_TOPIC_0031523135__li8531832155310">(Optional) Select the <strong id="EN-US_TOPIC_0031523135__b1408122218304">Encryption</strong> option to encrypt the system disk during OS change.<p id="EN-US_TOPIC_0031523135__p767712438280">To enable encryption, click <span class="uicontrol" id="EN-US_TOPIC_0031523135__en-us_topic_0163572589_en-us_topic_0144542112_uicontrol528614138616"><b>Create Xrole</b></span> to assign KMS access permissions to EVS. If you have rights granting permission, assign the KMS access permissions to EVS. If you do not have the permission, contact the user having the security administrator rights to assign the KMS access permissions. For details, see <a href="en-us_topic_0047272493.html">Can All Users Use the Encryption Feature?</a></p>
<p id="EN-US_TOPIC_0031523135__en-us_topic_0144542112_p228631310615">Encryption parameters are as follows:</p>
@ -27,12 +27,12 @@
</li><li id="EN-US_TOPIC_0031523135__li17273849113530">(Optional) Select a <strong id="EN-US_TOPIC_0031523135__b84235270615319">License Type</strong> (<strong id="EN-US_TOPIC_0031523135__b842352706153129">Use license from the system</strong> or <strong id="EN-US_TOPIC_0031523135__b842352706153134">Bring your own license (BYOL)</strong>) if the changed OS running on your ECS is billed. For more details, see <a href="en-us_topic_0046566932.html">License Type</a>.<div class="p" id="EN-US_TOPIC_0031523135__p57004530113530">The following OSs are billed:<ul id="EN-US_TOPIC_0031523135__ul43278730113530"><li id="EN-US_TOPIC_0031523135__en-us_topic_0046566932_li2586589022251">SUSE Linux Enterprise Server</li><li id="EN-US_TOPIC_0031523135__en-us_topic_0046566932_li6521605722253">Oracle Enterprise Linux</li><li id="EN-US_TOPIC_0031523135__en-us_topic_0046566932_li37000181205155">Red Hat Enterprise Linux</li></ul>
</div>
</li><li id="EN-US_TOPIC_0031523135__li5336143212240">Configure the login mode.<p id="EN-US_TOPIC_0031523135__p1154194111115"><a name="EN-US_TOPIC_0031523135__li5336143212240"></a><a name="li5336143212240"></a>If the target <span id="EN-US_TOPIC_0031523135__text1916311471252">ECS</span> uses key pair authentication, you can replace the original key pair.</p>
</li><li id="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li4798821517833">Click <strong id="EN-US_TOPIC_0031523135__b153798544917">OK</strong>.</li><li id="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li45992498111556"><a name="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li45992498111556"></a><a name="en-us_topic_0031523135_en-us_topic_0024911405_li45992498111556"></a>On the <strong id="EN-US_TOPIC_0031523135__b154321536134511">Change ECS OS</strong> page, confirm the specifications, and click <strong id="EN-US_TOPIC_0031523135__b92606107463">Submit Application</strong>.<p id="EN-US_TOPIC_0031523135__p4013850816820">After the application is submitted, the <span id="EN-US_TOPIC_0031523135__text15818650162514">ECS</span> status changes to <strong id="EN-US_TOPIC_0031523135__b84235270616717">Changing OS</strong>. The OS changing has been completed when <strong id="EN-US_TOPIC_0031523135__b5174921112616">Changing OS</strong> disappears.</p>
</li><li id="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li4798821517833">Click <strong id="EN-US_TOPIC_0031523135__b153798544917">OK</strong>.</li><li id="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li45992498111556"><a name="EN-US_TOPIC_0031523135__en-us_topic_0031523135_en-us_topic_0024911405_li45992498111556"></a><a name="en-us_topic_0031523135_en-us_topic_0024911405_li45992498111556"></a>On the <strong id="EN-US_TOPIC_0031523135__b155074211453">Change ECS OS</strong> page, confirm the specifications, and click <strong id="EN-US_TOPIC_0031523135__b19507202134518">Submit Application</strong>.<p id="EN-US_TOPIC_0031523135__p4013850816820">After the application is submitted, the <span id="EN-US_TOPIC_0031523135__text15818650162514">ECS</span> status changes to <strong id="EN-US_TOPIC_0031523135__b84235270616717">Changing OS</strong>. The OS changing has been completed when <strong id="EN-US_TOPIC_0031523135__b5174921112616">Changing OS</strong> disappears.</p>
<div class="note" id="EN-US_TOPIC_0031523135__note1993244016842"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0031523135__p3492635716815">A temporary <span id="EN-US_TOPIC_0031523135__text26231188142">ECS</span> is created during the OS changing process. After the process is complete, this <span id="EN-US_TOPIC_0031523135__text1418210226147">ECS</span> will be automatically deleted.</p>
</div></div>
</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0031523135__section6296573110114"><h4 class="sectiontitle">Follow-up Procedure</h4><ul id="EN-US_TOPIC_0031523135__ul4795134972312"><li id="EN-US_TOPIC_0031523135__li195531036181619">If the OSs before and after the OS change are both Linux, and automatic partition mounting upon system startup has been enabled for the data disk, the data disk partition mounting information will be lost after the OS is changed. In such a case, you need to update the <strong id="EN-US_TOPIC_0031523135__b14132191695315">/etc/fstab</strong> configuration.<ol id="EN-US_TOPIC_0031523135__ol1872074232416"><li id="EN-US_TOPIC_0031523135__li3720104202410">Write the new partition information into <strong id="EN-US_TOPIC_0031523135__b192164695410">/etc/fstab</strong>.<p id="EN-US_TOPIC_0031523135__p39926243116">It is a good practice to back up the <strong id="EN-US_TOPIC_0031523135__b19396757185410">/etc/fstab</strong> file before writing data into it.</p>
<div class="section" id="EN-US_TOPIC_0031523135__section6296573110114"><h4 class="sectiontitle">Follow-up Procedure</h4><ul id="EN-US_TOPIC_0031523135__ul4795134972312"><li id="EN-US_TOPIC_0031523135__li195531036181619">If the OSs before and after the OS change are both Linux, and automatic mounting upon system startup has been enabled for data disks, the data disk partition mounting information will be lost after the OS is changed. In such a case, you need to update the <strong id="EN-US_TOPIC_0031523135__b14132191695315">/etc/fstab</strong> configuration.<ol id="EN-US_TOPIC_0031523135__ol1872074232416"><li id="EN-US_TOPIC_0031523135__li3720104202410">Write the new partition information into <strong id="EN-US_TOPIC_0031523135__b192164695410">/etc/fstab</strong>.<p id="EN-US_TOPIC_0031523135__p39926243116">It is a good practice to back up the <strong id="EN-US_TOPIC_0031523135__b19396757185410">/etc/fstab</strong> file before writing data into it.</p>
<p id="EN-US_TOPIC_0031523135__p20852173863413">To enable automatic partition mounting upon system startup, see <a href="en-us_topic_0085634797.html">Initializing a Linux Data Disk (fdisk)</a>.</p>
</li><li id="EN-US_TOPIC_0031523135__li54436398246">Mount the partition so that you can use the data disk.<p id="EN-US_TOPIC_0031523135__p59351323337"><a name="EN-US_TOPIC_0031523135__li54436398246"></a><a name="li54436398246"></a><strong id="EN-US_TOPIC_0031523135__b1785919239581">mount</strong> <em id="EN-US_TOPIC_0031523135__i7864172319584">Disk partition</em> <em id="EN-US_TOPIC_0031523135__i1386562311589">Device name</em></p>
</li><li id="EN-US_TOPIC_0031523135__li212413912617">Check the mount result.<p id="EN-US_TOPIC_0031523135__p11281039767"><a name="EN-US_TOPIC_0031523135__li212413912617"></a><a name="li212413912617"></a><strong id="EN-US_TOPIC_0031523135__b143744411567">df -TH</strong></p>

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</tr>
<tr id="EN-US_TOPIC_0032380449__row73991405372"><td class="cellrowborder" valign="top" width="17.648235176482352%" headers="mcps1.3.4.4.1.1.2.4.1.1 "><p id="EN-US_TOPIC_0032380449__p1399174073719">Format</p>
</td>
<td class="cellrowborder" valign="top" width="44.125587441255874%" headers="mcps1.3.4.4.1.1.2.4.1.2 "><p id="EN-US_TOPIC_0032380449__p7604786420">A script must be started with <span class="parmvalue" id="EN-US_TOPIC_0032380449__parmvalue25671095321313"><b>#!</b></span>, for example, <span class="parmvalue" id="EN-US_TOPIC_0032380449__parmvalue1569820674213056"><b>#!/bin/bash</b></span> and <span class="parmvalue" id="EN-US_TOPIC_0032380449__parmvalue982854425213127"><b>#!/usr/bin/env python</b></span>.</p>
<td class="cellrowborder" valign="top" width="44.125587441255874%" headers="mcps1.3.4.4.1.1.2.4.1.2 "><p id="EN-US_TOPIC_0032380449__p17890114419597">The first line must start with <span class="parmvalue" id="EN-US_TOPIC_0032380449__parmvalue089018443596"><b>#!</b></span> (for example, <strong id="EN-US_TOPIC_0032380449__b19369330313">#!/bin/bash</strong> or <strong id="EN-US_TOPIC_0032380449__b58220381832">#!/usr/bin/env python</strong>) and no spaces are allowed at the beginning.</p>
<p id="EN-US_TOPIC_0032380449__p173991540123716">When a script is started for the first time, it will be executed at the rc.local-like level, indicating a low priority in the boot sequence.</p>
</td>
<td class="cellrowborder" valign="top" width="38.226177382261774%" headers="mcps1.3.4.4.1.1.2.4.1.3 "><p id="EN-US_TOPIC_0032380449__p113991340193713">The first line must be <span class="parmvalue" id="EN-US_TOPIC_0032380449__parmvalue65262554154555"><b>#cloud-config</b></span>, and no space is allowed in front of it.</p>
@ -71,7 +71,7 @@ echo "Hello, the time is now $(date -R)" | tee /root/output.txt</pre>
<p id="EN-US_TOPIC_0032380449__p316665544119">After the <span id="EN-US_TOPIC_0032380449__text1654745284317">ECS</span> is created, start it and run the <strong id="EN-US_TOPIC_0032380449__b741518589424">cat </strong><em id="EN-US_TOPIC_0032380449__i39973094314">[file]</em> command to check the script execution result.</p>
<pre class="screen" id="EN-US_TOPIC_0032380449__screen353671394316">[root@XXXXXXXX ~]# cat /root/output.txt
Hello, the time is now Mon, 16 Jul 2016 16:03:18+0800</pre>
<p id="EN-US_TOPIC_0032380449__p1849372719381"><strong id="EN-US_TOPIC_0032380449__b159375716">Example 2: Inject a Cloud-Config data script.</strong></p>
<p id="EN-US_TOPIC_0032380449__p1849372719381"><strong id="EN-US_TOPIC_0032380449__b895363177">Example 2: Inject a Cloud-Config data script.</strong></p>
<p id="EN-US_TOPIC_0032380449__p104921296416">When creating an <span id="EN-US_TOPIC_0032380449__text231733611919">ECS</span>, set <strong id="EN-US_TOPIC_0032380449__b83221136111911">User Data</strong> to <strong id="EN-US_TOPIC_0032380449__b632319362193">As text</strong> and enter the customized user data script.</p>
<pre class="screen" id="EN-US_TOPIC_0032380449__screen188011505456">#cloud-config
bootcmd:

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</td>
<td class="cellrowborder" valign="top" width="31.259999999999998%" headers="mcps1.3.3.3.2.4.1.2 "><p id="EN-US_TOPIC_0032398121__p20491672174818">System error. Try again later or contact customer service.</p>
</td>
<td class="cellrowborder" valign="top" width="54.769999999999996%" headers="mcps1.3.3.3.2.4.1.3 "><p id="EN-US_TOPIC_0032398121__p49212711174818">Adjust the request structure as directed in <em id="EN-US_TOPIC_0032398121__i1816529299">Elastic Cloud Server API Reference</em>.</p>
<td class="cellrowborder" valign="top" width="54.769999999999996%" headers="mcps1.3.3.3.2.4.1.3 "><p id="EN-US_TOPIC_0032398121__p49212711174818">Adjust the request structure as directed in <em id="EN-US_TOPIC_0032398121__i1024668488">Elastic Cloud Server API Reference</em>.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0032398121__row51965547173837"><td class="cellrowborder" valign="top" width="13.969999999999999%" headers="mcps1.3.3.3.2.4.1.1 "><p id="EN-US_TOPIC_0032398121__p39933195174818">Ecs.0010</p>

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<h1 class="topictitle1">ECS Types</h1>
<div id="body1471085686525"><div class="p" id="EN-US_TOPIC_0035470096__p12646151217497">The cloud platform provides the following ECS types for different application scenarios:<ul id="EN-US_TOPIC_0035470096__ul881035115013"><li id="EN-US_TOPIC_0035470096__li681335115012">General-purpose</li><li id="EN-US_TOPIC_0035470096__li1338815123266">Dedicated general-purpose</li><li id="EN-US_TOPIC_0035470096__li1672610268563">Memory-optimized</li><li id="EN-US_TOPIC_0035470096__li164737493505">Large-memory</li><li id="EN-US_TOPIC_0035470096__li879873165110">Disk-intensive</li><li id="EN-US_TOPIC_0035470096__li1250715555110">High-performance computing</li><li id="EN-US_TOPIC_0035470096__li925562635117">GPU-accelerated</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0035470096__section741930611313"><h4 class="sectiontitle">ECS Flavor Naming Rules</h4><p id="EN-US_TOPIC_0035470096__p44031986103452">ECS flavors are named using the format of "AB.C.D".</p>
<div class="section" id="EN-US_TOPIC_0035470096__section741930611313"><h4 class="sectiontitle">ECS Flavor Naming Rules</h4><p id="EN-US_TOPIC_0035470096__p44031986103452">ECS flavors are named in the "AB.C.D" format.</p>
<p id="EN-US_TOPIC_0035470096__p1985920011446">The format is defined as follows:</p>
<ul id="EN-US_TOPIC_0035470096__ul5780315811459"><li id="EN-US_TOPIC_0035470096__li5046637411459"><strong id="EN-US_TOPIC_0035470096__b1468984664418">A</strong> specifies the ECS type. For example, <strong id="EN-US_TOPIC_0035470096__b106951046104414">s</strong> indicates a general-purpose ECS, <strong id="EN-US_TOPIC_0035470096__b5696204644416">c</strong> a computing ECS, and <strong id="EN-US_TOPIC_0035470096__b8696134612442">m</strong> a memory-optimized ECS.</li><li id="EN-US_TOPIC_0035470096__li5154418311459"><strong id="EN-US_TOPIC_0035470096__b191663359172">B</strong> specifies the type ID. For example, the <strong id="EN-US_TOPIC_0035470096__b6166173571711">3</strong> in <strong id="EN-US_TOPIC_0035470096__b1816693581710">s3</strong> indicates a general-purpose third-generation ECS.</li><li id="EN-US_TOPIC_0035470096__li6124446611459"><strong id="EN-US_TOPIC_0035470096__b1780433431194419">C</strong> specifies the flavor size, such as medium, large, xlarge, 2xlarge, 4xlarge, or 8xlarge.</li><li id="EN-US_TOPIC_0035470096__li3693402711546"><strong id="EN-US_TOPIC_0035470096__b84235270611859">D</strong> specifies the ratio of memory to vCPUs expressed in a digit. For example, value <strong id="EN-US_TOPIC_0035470096__b842352706111144">4</strong> indicates that the ratio of memory to vCPUs is 4.</li></ul>
<ul id="EN-US_TOPIC_0035470096__ul5780315811459"><li id="EN-US_TOPIC_0035470096__li5046637411459"><strong id="EN-US_TOPIC_0035470096__b1468984664418">A</strong> specifies the ECS type. For example, <strong id="EN-US_TOPIC_0035470096__b106951046104414">s</strong> indicates a general-purpose ECS, <strong id="EN-US_TOPIC_0035470096__b5696204644416">c</strong> a general computing-plus ECS, and <strong id="EN-US_TOPIC_0035470096__b8696134612442">m</strong> a memory-optimized ECS.</li><li id="EN-US_TOPIC_0035470096__li5154418311459"><strong id="EN-US_TOPIC_0035470096__b191663359172">B</strong> specifies the type ID. For example, <strong id="EN-US_TOPIC_0035470096__b6166173571711">3</strong> in <strong id="EN-US_TOPIC_0035470096__b1816693581710">s3</strong> indicates a general-purpose third-generation ECS.</li><li id="EN-US_TOPIC_0035470096__li6124446611459"><strong id="EN-US_TOPIC_0035470096__b1780433431194419">C</strong> specifies the flavor size, such as medium, large, xlarge, 2xlarge, 4xlarge, or 8xlarge.</li><li id="EN-US_TOPIC_0035470096__li3693402711546"><strong id="EN-US_TOPIC_0035470096__b84235270611859">D</strong> specifies the ratio of memory to vCPUs expressed in a digit. For example, value <strong id="EN-US_TOPIC_0035470096__b842352706111144">4</strong> indicates that the ratio of memory to vCPUs is 4.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0035470096__section3154475711225"><h4 class="sectiontitle">Obtaining Specifications When Creating an ECS</h4><p id="EN-US_TOPIC_0035470096__en-us_topic_0030888081_en-us_topic_0029599331_p43304173161639">Specifications for the ECS being created are located in the specifications list.</p>
<div class="fignone" id="EN-US_TOPIC_0035470096__fig64292023143619"><span class="figcap"><b>Figure 1 </b>ECS specifications</span><br><span><img id="EN-US_TOPIC_0035470096__image2131101111256" src="en-us_image_0172453607.png" title="Click to enlarge" class="imgResize"></span></div>
</div>
<div class="section" id="EN-US_TOPIC_0035470096__section9843135016217"><h4 class="sectiontitle">Network QoS</h4><p id="EN-US_TOPIC_0035470096__p2719863452">Network QoS uses basic technologies to improve the quality of network communication. A network with QoS enabled offers predictable network performance and effectively allocates network bandwidth to use network resources.</p>
<p id="EN-US_TOPIC_0035470096__p177731525134614">To obtain the QoS data of an ECS flavor, including the maximum bandwidth, assured bandwidth, maximum PPS, and NIC multi-queue, see <a href="en-us_topic_0177512565.html">ECS Specifications</a>.</p>
<div class="p" id="EN-US_TOPIC_0035470096__p835110576352">The intranet bandwidth and PPS of an ECS are determined based on ECS flavors.<ul id="EN-US_TOPIC_0035470096__ul123521357113516"><li id="EN-US_TOPIC_0035470096__li17352957153514">Assured intranet bandwidth: guaranteed bandwidth allocated to the ECS</li><li id="EN-US_TOPIC_0035470096__li20352457113514">Maximum intranet bandwidth: maximum bandwidth that can be allocated to the ECS</li><li id="EN-US_TOPIC_0035470096__li2352195783519">Maximum intranet PPS: maximum number of packets that the ECS can transmit and receive per second</li><li id="EN-US_TOPIC_0035470096__li192851238163616">NIC multi-queues: allocates NIC interrupt requests to multiple vCPUs for higher PPS performance and bandwidth</li><li id="EN-US_TOPIC_0035470096__li839012814476">Maximum NICs: maximum number of NICs that can be attached to an ECS.<div class="note" id="EN-US_TOPIC_0035470096__note439042864715"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0035470096__ul1439014285471"><li id="EN-US_TOPIC_0035470096__li239011287472">For instructions about how to test PPS, see <a href="en-us_topic_0115820205.html">How Can I Test Network Performance?</a></li><li id="EN-US_TOPIC_0035470096__li17390182813478">For instructions about how to enable NIC multi-queue, see <a href="en-us_topic_0058758453.html">Enabling NIC Multi-Queue</a>.</li></ul>
<p id="EN-US_TOPIC_0035470096__p177731525134614">To obtain the QoS data of an ECS flavor, including the maximum bandwidth, assured bandwidth, maximum PPS, and NIC multi-queue, see <a href="en-us_topic_0177512565.html">A Summary List of ECS Specifications</a>.</p>
<div class="p" id="EN-US_TOPIC_0035470096__p835110576352">The intranet bandwidth and PPS of an ECS are determined based on ECS flavors.<ul id="EN-US_TOPIC_0035470096__ul123521357113516"><li id="EN-US_TOPIC_0035470096__li37913491485">Assured intranet bandwidth: indicates the guaranteed bandwidth allocated to an ECS when network bandwidth contention occurs in the entire network.</li><li id="EN-US_TOPIC_0035470096__li379249134818">Maximum intranet bandwidth: indicates the maximum bandwidth that can be allocated to an ECS when the ECS does not compete for network bandwidth (other ECSs on the host do not have high requirements on network bandwidth).</li><li id="EN-US_TOPIC_0035470096__li2352195783519">Maximum intranet PPS: maximum number of packets that the ECS can transmit and receive per second</li><li id="EN-US_TOPIC_0035470096__li192851238163616">NIC multi-queues: allocates NIC interrupt requests to multiple vCPUs for higher PPS performance and bandwidth</li><li id="EN-US_TOPIC_0035470096__li839012814476">Maximum NICs: maximum number of NICs that can be attached to an ECS.<div class="note" id="EN-US_TOPIC_0035470096__note439042864715"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0035470096__ul1439014285471"><li id="EN-US_TOPIC_0035470096__li239011287472">For instructions about how to test PPS, see <a href="en-us_topic_0115820205.html">How Can I Test Network Performance?</a></li><li id="EN-US_TOPIC_0035470096__li17390182813478">For instructions about how to enable NIC multi-queue, see <a href="en-us_topic_0058758453.html">Enabling NIC Multi-Queue</a>.</li></ul>
</div></div>
</li></ul>
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</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li54923077223716">When the physical host where a D2 ECS is deployed becomes faulty, the ECS cannot be migrated.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li151915198480">To improve network performance, you can set the NIC MTU of a D2 ECS to <strong id="EN-US_TOPIC_0035470099__b84235270612277">8888</strong>.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li63198920223614">D2 ECSs do not support modifying specifications.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li14386295223843">D2 ECSs do not support local disk snapshots or backups.</li><li id="EN-US_TOPIC_0035470099__li177919151012">D2 ECSs do not support OS reinstallation or change.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li18838856223614">D2 ECSs can use both local disks and EVS disks to store data. In addition, they can have EVS disks attached to provide a larger storage size. Use restrictions on the two types of storage media are as follows:<ul id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_ul35331977223614"><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li49552340223614">Only an EVS disk, not a local disk, can be used as the system disk of a D2 ECS.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li43317883223614">Both EVS disks and local disks can be used as data disks of a D2 ECS.</li><li id="EN-US_TOPIC_0035470099__li3171339122615">A maximum of 60 disks (including VBD, SCSI, and local disks) can be attached to a D2 ECS. Among the 60 disks, the maximum number of SCSI disks is 30, and the VBD disks (including the system disk) is 24. For details, see <a href="en-us_topic_0018073215.html">Can I Attach Multiple Disks to an ECS?</a><div class="note" id="EN-US_TOPIC_0035470099__note1768622142210"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0035470099__p8681221228">The maximum number of disks attached to an existing D2 ECS remains unchanged. To attach 60 disks, enable advanced disk. For details, see <a href="en-us_topic_0122307169.html">Enabling Advanced Disk</a>.</p>
</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li54923077223716">When the physical host where a D2 ECS is deployed becomes faulty, the ECS cannot be migrated.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li151915198480">To improve network performance, you can set the NIC MTU of a D2 ECS to <strong id="EN-US_TOPIC_0035470099__b84235270612277">8888</strong>.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li63198920223614">D2 ECSs do not support specifications modification.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li14386295223843">D2 ECSs do not support local disk snapshots or backups.</li><li id="EN-US_TOPIC_0035470099__li177919151012">D2 ECSs do not support OS reinstallation or change.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li18838856223614">D2 ECSs can use both local disks and EVS disks to store data. In addition, they can have EVS disks attached to provide a larger storage size. Use restrictions on the two types of storage media are as follows:<ul id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_ul35331977223614"><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li49552340223614">Only an EVS disk, not a local disk, can be used as the system disk of a D2 ECS.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li43317883223614">Both EVS disks and local disks can be used as data disks of a D2 ECS.</li><li id="EN-US_TOPIC_0035470099__li3171339122615">A maximum of 60 disks (including VBD, SCSI, and local disks) can be attached to a D2 ECS. Among the 60 disks, the maximum number of SCSI disks is 30, and the VBD disks (including the system disk) is 24. For details, see <a href="en-us_topic_0018073215.html">Can I Attach Multiple Disks to an ECS?</a><div class="note" id="EN-US_TOPIC_0035470099__note1768622142210"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0035470099__p8681221228">The maximum number of disks attached to an existing D2 ECS remains unchanged. To attach 60 disks, enable advanced disk. For details, see <a href="en-us_topic_0122307169.html">Enabling Advanced Disk</a>.</p>
</div></div>
</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li178320164203">You are advised to use World Wide Names (WWNs), but not drive letters, in applications to perform operations on local disks to prevent drive letter drift (low probability) on Linux. Take local disk attachment as an example:<p id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_p125271917152017"><a name="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li178320164203"></a><a name="en-us_topic_0088142885_li178320164203"></a>If the local disk WWN is wwn-0x50014ee2b14249f6, run the <strong id="EN-US_TOPIC_0035470099__b103256708420139">mount /dev/disk/by-id/wwn-0x50014ee2b14249f6</strong> command.</p>
<div class="note" id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_note7400716205517"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_p9401316185516">How can I view the local disk WWN?</p>
@ -255,7 +255,7 @@
</li></ol>
</div></div>
</li></ul>
</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li1717385122398">The local disk data of a D2 ECS may be lost due to some reasons, such as physical server breakdown or local disk damage. If the data reliability of your application cannot be ensured, you are strongly advised to use EVS disks to build your ECS.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li2034693822398">When a D2 ECS is deleted, its local disk data is automatically deleted. Back up the data before deleting such an ECS. Deleting local disk data is time-consuming. Therefore, a D2 ECS requires a longer period of time than other ECSs for releasing resources.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li4890471922398">Do not store long-term service data in local disks. Instead, back up data in a timely manner and use a high availability data architecture. Store long-term service data in EVS disks.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li1242239722417">You are not allowed to buy additional local disks. The quantity and capacity of your local disks are determined according to your ECS flavor. For D2 ECSs, if additional local disks are required, buy them when creating the ECSs.</li></ul>
</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li1717385122398">The local disk data of a D2 ECS may be lost due to some reasons, such as physical server breakdown or local disk damage. If the data reliability of your application cannot be ensured, you are strongly advised to use EVS disks to build your ECS.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li2034693822398">When a D2 ECS is deleted, its local disk data is automatically deleted. Back up the data before deleting such an ECS. Deleting local disk data is time-consuming. Therefore, a D2 ECS requires a longer period of time than other ECSs for releasing resources.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li4890471922398">Do not store long-term service data in local disks. Instead, back up data in a timely manner and use a high availability data architecture. Store long-term service data in EVS disks.</li><li id="EN-US_TOPIC_0035470099__en-us_topic_0088142885_li1242239722417">Local disks can only be purchased during ECS creation. The quantity and capacity of your local disks are determined according to the specifications of your ECS.</li></ul>
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</li><li id="EN-US_TOPIC_0035470100__li4951377311549">For SUSE H2 ECSs, if IP over InfiniBand (IPoIB) is required, you must manually configure an IP address for the InfiniBand NIC after installing the InfiniBand driver. For details, see <a href="en-us_topic_0083225171.html">How Can I Manually Configure an IP Address for an InfiniBand NIC?</a></li><li id="EN-US_TOPIC_0035470100__li2356792611282">After you delete an H2 ECS, the data stored in SSDs is automatically cleared. Therefore, do not store persistence data into SSDs during ECS running.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0035470100__section10721258203459"><h4 class="sectiontitle">Notes on Using HL1 ECSs</h4><ul id="EN-US_TOPIC_0035470100__ul4302655220366"><li id="EN-US_TOPIC_0035470100__li16593109204138">HL1 ECSs only support the attachment of high I/O (performance-optimized I) and ultra-high I/O (latency-optimized) EVS disks.<p id="EN-US_TOPIC_0035470100__p6694708171846"><a name="EN-US_TOPIC_0035470100__li16593109204138"></a><a name="li16593109204138"></a>To support 56 Gbit/s shared high I/O storage, you only need to attach high I/O (performance-optimized I) or ultra-high I/O (latency-optimized) EVS disks to target HL1 ECSs.</p>
</li><li id="EN-US_TOPIC_0035470100__li25572732203713">HL1 ECSs do not support specifications modification.</li><li id="EN-US_TOPIC_0035470100__li44397844204037">HL1 ECSs use InfiniBand NICs that provide a bandwidth of 100 Gbit/s.</li><li id="EN-US_TOPIC_0035470100__li2353082593959">HL1 ECSs created using a private image must have the InfiniBand NIC driver installed. Download the required version (4.2-1.0.0.0) of InfiniBand NIC driver from the official Mellanox website and install the driver by following the instructions provided by Mellanox.<ul id="EN-US_TOPIC_0035470100__ul1045084093959"><li id="EN-US_TOPIC_0035470100__li2694870093959">InfiniBand NIC type: <span class="parmvalue" id="EN-US_TOPIC_0035470100__parmvalue1344925624"><b>Mellanox Technologies ConnectX-4 Infiniband HBA (MCX455A-ECAT)</b></span></li><li id="EN-US_TOPIC_0035470100__li3536107193959">Mellanox official website: <a href="http://www.mellanox.com/" target="_blank" rel="noopener noreferrer">http://www.mellanox.com/</a></li></ul>
</li><li id="EN-US_TOPIC_0035470100__li25572732203713">HL1 ECSs do not support specifications modification.</li><li id="EN-US_TOPIC_0035470100__li44397844204037">HL1 ECSs use InfiniBand NICs that provide a bandwidth of 100 Gbit/s.</li><li id="EN-US_TOPIC_0035470100__li2353082593959">HL1 ECSs created using a private image must have the InfiniBand NIC driver installed. Download the required version (4.2-1.0.0.0) of InfiniBand NIC driver from the official Mellanox website and install the driver by following the instructions provided by Mellanox.<ul id="EN-US_TOPIC_0035470100__ul1045084093959"><li id="EN-US_TOPIC_0035470100__li2694870093959">InfiniBand NIC type: <span class="parmvalue" id="EN-US_TOPIC_0035470100__parmvalue1125653360"><b>Mellanox Technologies ConnectX-4 Infiniband HBA (MCX455A-ECAT)</b></span></li><li id="EN-US_TOPIC_0035470100__li3536107193959">Mellanox official website: <a href="http://www.mellanox.com/" target="_blank" rel="noopener noreferrer">http://www.mellanox.com/</a></li></ul>
</li><li id="EN-US_TOPIC_0035470100__li35926083111552">For SUSE HL1 ECSs, if IPoIB is required, you must manually configure an IP address for the InfiniBand NIC after installing the InfiniBand driver. For details, see <a href="en-us_topic_0083225171.html">How Can I Manually Configure an IP Address for an InfiniBand NIC?</a></li><li id="EN-US_TOPIC_0035470100__li16497101912286"><a href="#EN-US_TOPIC_0035470100__table204972196287">Table 4</a> lists the OSs supported by HL1 ECSs.
<div class="tablenoborder"><a name="EN-US_TOPIC_0035470100__table204972196287"></a><a name="table204972196287"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0035470100__table204972196287" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Supported OS versions</caption><thead align="left"><tr id="EN-US_TOPIC_0035470100__en-us_topic_0035470100_row11278327192211"><th align="left" class="cellrowborder" valign="top" width="49.95%" id="mcps1.3.6.2.6.2.2.3.1.1"><p id="EN-US_TOPIC_0035470100__en-us_topic_0035470100_p19278162716225">OS</p>
</th>

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