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Reviewed-by: Pristromskaia, Margarita <margarita.pristromskaia@t-systems.com>
Co-authored-by: guoyanyan <guoyanyan3@huawei.com>
Co-committed-by: guoyanyan <guoyanyan3@huawei.com>
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guoyanyan 2023-04-13 12:10:58 +00:00 committed by zuul
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<div id="body27997"><p id="as_01_0102__p60047194313">Elastic Load Balancing (ELB) automatically distributes incoming traffic across multiple backend servers based on configured forwarding policies. ELB expands the service capabilities of applications and improves their availability by eliminating single points of failure (SPOFs).</p> <div id="body27997"><p id="as_01_0102__p60047194313">Elastic Load Balancing (ELB) automatically distributes incoming traffic across multiple backend servers based on configured forwarding policies. ELB expands the service capabilities of applications and improves their availability by eliminating single points of failure (SPOFs).</p>
<p id="as_01_0102__p24961767172013">If ELB functions are required, perform the operations provided in this section to add a load balancer to your AS group. The load balancer added to an AS group distributes application traffic to all instances in the AS group when an instance is added to or deleted from the AS group.</p> <p id="as_01_0102__p24961767172013">If ELB functions are required, perform the operations provided in this section to add a load balancer to your AS group. The load balancer added to an AS group distributes application traffic to all instances in the AS group when an instance is added to or deleted from the AS group.</p>
<p id="as_01_0102__p61668855162725">Only a created load balancer can be bound to an AS group, and the AS group and load balancer must be in the same VPC. For details about how to create a load balancer, see <em id="as_01_0102__i426810252439"></em><em id="as_01_0102__i172684256431"></em><em id="as_01_0102__i4268182512431"></em><em id="as_01_0102__i132681525184318">Elastic Load Balancing User Guide</em><em id="as_01_0102__i122698253433"></em><em id="as_01_0102__i477985218389"></em><em id="as_01_0102__i9269325134320"></em>. To add a load balancer for an AS group, perform the following operations:</p> <p id="as_01_0102__p61668855162725">Only a created load balancer can be bound to an AS group, and the AS group and load balancer must be in the same VPC. For details about how to create a load balancer, see <em id="as_01_0102__i426810252439"></em><em id="as_01_0102__i172684256431"></em><em id="as_01_0102__i4268182512431"></em><em id="as_01_0102__i132681525184318">Elastic Load Balancing User Guide</em><em id="as_01_0102__i122698253433"></em><em id="as_01_0102__i477985218389"></em><em id="as_01_0102__i9269325134320"></em>. To add a load balancer for an AS group, perform the following operations:</p>
<ul id="as_01_0102__ul18103114716363"><li id="as_01_0102__li11103114743610">When creating an AS group, configure parameter <strong id="as_01_0102__b1499520558382">Load Balancing</strong> to add a load balancer. For details, see <a href="en-us_topic_0042018368.html">Creating an AS Group</a>.</li><li id="as_01_0102__li870934165617">If the AS group is not enabled, contains no instance, and has no scaling action ongoing, you can modify <strong id="as_01_0102__b287996202">Load Balancing</strong> to add a load balancer for the AS group. For details, see <a href="as_01_0106.html">Modifying an AS Group</a>.</li></ul> <ul id="as_01_0102__ul18103114716363"><li id="as_01_0102__li11103114743610">When creating an AS group, configure parameter <strong id="as_01_0102__b1499520558382">Load Balancing</strong> to add a load balancer. For details, see <a href="en-us_topic_0042018368.html">Creating an AS Group</a>.</li><li id="as_01_0102__li870934165617">If the AS group is not enabled, contains no instance, and has no scaling action ongoing, you can modify <strong id="as_01_0102__b1597315286">Load Balancing</strong> to add a load balancer for the AS group. For details, see <a href="as_01_0106.html">Modifying an AS Group</a>.</li></ul>
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<h1 class="topictitle1">Enabling an AS Group</h1> <h1 class="topictitle1">Enabling an AS Group</h1>
<div id="body3148005"><div class="section" id="as_01_0104__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_01_0104__p5261101691115">You can enable an AS group to automatically scale in or out capacity.</p> <div id="body3148005"><div class="section" id="as_01_0104__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_01_0104__p5261101691115">You can enable an AS group to automatically scale capacity in or out.</p>
<p id="as_01_0104__p22340483145237">After an AS group is enabled, its status changes to <strong id="as_01_0104__b81000019229">Enabled</strong>. AS monitors the AS policy and triggers a scaling action for AS groups only in <strong id="as_01_0104__b729000719229">Enabled</strong> state. After an AS group is enabled, AS triggers a scaling action to automatically add or remove instances if the number of instances in the AS group is different from the expected number of instances.</p> <p id="as_01_0104__p22340483145237">After an AS group is enabled, its status changes to <strong id="as_01_0104__b81000019229">Enabled</strong>. AS monitors the AS policy and triggers a scaling action for AS groups only in <strong id="as_01_0104__b729000719229">Enabled</strong> state. After an AS group is enabled, AS triggers a scaling action to automatically add or remove instances if the number of instances in the AS group is different from the expected number of instances.</p>
<ul id="as_01_0104__ul144791150104313"><li id="as_01_0104__li5480650174319">Only AS groups in the <strong id="as_01_0104__b15243164218319">Disabled</strong> state can be enabled.</li><li id="as_01_0104__li16735205440">Only AS groups in the <strong id="as_01_0104__b52524182413">Abnormal</strong> state can be forcibly enabled. You can choose <strong id="as_01_0104__b121207121729">More</strong> &gt; <strong id="as_01_0104__b74181162025">Forcibly Enable</strong> to enable an abnormal AS group. Forcibly enabling an AS group does not have adverse consequences.</li><li id="as_01_0104__li207693191444">After you create an AS group and add an AS configuration to an AS group, the AS group is automatically enabled.</li></ul> <ul id="as_01_0104__ul144791150104313"><li id="as_01_0104__li5480650174319">Only AS groups in the <strong id="as_01_0104__b15243164218319">Disabled</strong> state can be enabled.</li><li id="as_01_0104__li16735205440">Only AS groups in the <strong id="as_01_0104__b52524182413">Abnormal</strong> state can be forcibly enabled. You can choose <strong id="as_01_0104__b121207121729">More</strong> &gt; <strong id="as_01_0104__b74181162025">Forcibly Enable</strong> to enable an abnormal AS group. Forcibly enabling an AS group does not have adverse consequences.</li><li id="as_01_0104__li207693191444">After you create an AS group and add an AS configuration to an AS group, the AS group is automatically enabled.</li></ul>
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<div class="section" id="as_01_0104__section47602278104932"><h4 class="sectiontitle">Enabling an AS Group</h4><ol id="as_01_0104__ol52511872104959"><li id="as_01_0104__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_01_0104__li5914166211049">Click <span><img id="as_01_0104__image444954844511" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_01_0104__li6308165821918">Under <strong id="as_01_0104__b16985128154512">Computing</strong>, click <strong id="as_01_0104__b799792824519">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_01_0104__b7999102894517">Instance Scaling</strong>. Then click the <strong id="as_01_0104__b1801229144513">AS Groups</strong> tab.</li><li id="as_01_0104__li6647531">In the AS group list, locate the row containing the target AS group and click <strong id="as_01_0104__b1072322648162420">Enable</strong> in the <strong id="as_01_0104__b2936649719229">Operation</strong> column. You can also click the AS group name and then <strong id="as_01_0104__b1491982662916">Enable</strong> to the right of <strong id="as_01_0104__b1920122618294">Status</strong> on the <strong id="as_01_0104__b192117263298">Basic Information</strong> page to enable the AS group.</li><li id="as_01_0104__li44278307121256">In the <strong id="as_01_0104__b84235270645758">Enable AS Group</strong> dialog box, click <strong id="as_01_0104__b84235270645812">Yes</strong>.</li></ol> <div class="section" id="as_01_0104__section47602278104932"><h4 class="sectiontitle">Enabling an AS Group</h4><ol id="as_01_0104__ol52511872104959"><li id="as_01_0104__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_01_0104__li5914166211049">Click <span><img id="as_01_0104__image444954844511" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_01_0104__li6308165821918">Under <strong id="as_01_0104__b16985128154512">Computing</strong>, click <strong id="as_01_0104__b799792824519">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_01_0104__b7999102894517">Instance Scaling</strong>. Then click the <strong id="as_01_0104__b1801229144513">AS Groups</strong> tab.</li><li id="as_01_0104__li6647531">In the AS group list, locate the row containing the target AS group and click <strong id="as_01_0104__b1072322648162420">Enable</strong> in the <strong id="as_01_0104__b2936649719229">Operation</strong> column. You can also click the AS group name and then <strong id="as_01_0104__b1491982662916">Enable</strong> to the right of <strong id="as_01_0104__b1920122618294">Status</strong> on the <strong id="as_01_0104__b192117263298">Basic Information</strong> page to enable the AS group.</li><li id="as_01_0104__li44278307121256">In the <strong id="as_01_0104__b84235270645758">Enable AS Group</strong> dialog box, click <strong id="as_01_0104__b84235270645812">Yes</strong>.</li></ol>
</div> </div>
<div class="section" id="as_01_0104__section10127616112737"><h4 class="sectiontitle">Forcibly Enabling an AS Group</h4><ol id="as_01_0104__ol15030544112737"><li id="as_01_0104__li184971591347">Log in to the management console.</li><li id="as_01_0104__li9514561112737">Click <span><img id="as_01_0104__image282683719470" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_01_0104__li142011242142015">Under <strong id="as_01_0104__b14761193312452">Computing</strong>, click <strong id="as_01_0104__b12763733144510">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_01_0104__b117647339454">Instance Scaling</strong>. Then click the <strong id="as_01_0104__b177641833124513">AS Groups</strong> tab.</li><li id="as_01_0104__li23902354112737">In the AS group list, locate the row containing the target AS group and select <strong id="as_01_0104__b8423527065144">Forcibly Enable</strong> from the <strong id="as_01_0104__b1281549719229">More</strong> drop-down list in the <strong id="as_01_0104__b4823061519229">Operation</strong> column. You can also click the AS group name and then <strong id="as_01_0104__b1041663982417">Forcibly Enable</strong> to the right of <strong id="as_01_0104__b24217397242">Status</strong> on the <strong id="as_01_0104__b6421103922417">Basic Information</strong> page to enable the AS group.</li><li id="as_01_0104__li56088805141315">In the <strong id="as_01_0104__b904159832">Forcibly Enable AS Group</strong> dialog box, click <strong id="as_01_0104__b1953968378">Yes</strong>.</li></ol> <div class="section" id="as_01_0104__section10127616112737"><h4 class="sectiontitle">Forcibly Enabling an AS Group</h4><ol id="as_01_0104__ol15030544112737"><li id="as_01_0104__li184971591347">Log in to the management console.</li><li id="as_01_0104__li9514561112737">Click <span><img id="as_01_0104__image282683719470" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_01_0104__li142011242142015">Under <strong id="as_01_0104__b14761193312452">Computing</strong>, click <strong id="as_01_0104__b12763733144510">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_01_0104__b117647339454">Instance Scaling</strong>. Then click the <strong id="as_01_0104__b177641833124513">AS Groups</strong> tab.</li><li id="as_01_0104__li23902354112737">In the AS group list, locate the row containing the target AS group and select <strong id="as_01_0104__b8423527065144">Forcibly Enable</strong> from the <strong id="as_01_0104__b1281549719229">More</strong> drop-down list in the <strong id="as_01_0104__b4823061519229">Operation</strong> column. You can also click the AS group name and then <strong id="as_01_0104__b1041663982417">Forcibly Enable</strong> to the right of <strong id="as_01_0104__b24217397242">Status</strong> on the <strong id="as_01_0104__b6421103922417">Basic Information</strong> page to enable the AS group.</li><li id="as_01_0104__li56088805141315">In the <strong id="as_01_0104__b24424416">Forcibly Enable AS Group</strong> dialog box, click <strong id="as_01_0104__b444606405">Yes</strong>.</li></ol>
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<h1 class="topictitle1">Deleting an AS Group</h1> <h1 class="topictitle1">Deleting an AS Group</h1>
<div id="body1424418"><div class="section" id="as_01_0107__section08931748103217"><h4 class="sectiontitle">Scenarios</h4><p id="as_01_0107__p4172194518545">You can delete an AS group when it is no longer required.</p> <div id="body1424418"><div class="section" id="as_01_0107__section08931748103217"><h4 class="sectiontitle">Scenarios</h4><p id="as_01_0107__p4172194518545">You can delete an AS group when it is no longer required.</p>
<ul id="as_01_0107__ul2057894611142"><li id="as_01_0107__li5099279111142">If an AS group is not required during a specified period of time, you are advised to disable it but not delete it.</li><li id="as_01_0107__li1787626794625">An AS group can be deleted only when it has no instances and no scaling action is being performed.</li><li id="as_01_0107__li5628194211142">When an AS group is deleted, its AS policies and the alarm rules generated based those AS policies will be automatically deleted.</li></ul> <ul id="as_01_0107__ul2057894611142"><li id="as_01_0107__li5099279111142">If an AS group is not required during a specified period, you are advised to disable it but not delete it.</li><li id="as_01_0107__li1787626794625">An AS group can be deleted only when it has no instances and no scaling action is being performed.</li><li id="as_01_0107__li5628194211142">When an AS group is deleted, its AS policies and the alarm rules generated based on those AS policies will be automatically deleted.</li></ul>
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<div class="section" id="as_01_0107__section1959939911151"><h4 class="sectiontitle">Procedure</h4><ol id="as_01_0107__ol52511872104959"><li id="as_01_0107__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_01_0107__li5914166211049">Click <span><img id="as_01_0107__image17990104385317" src="en-us_image_0210485079.png"></span> in the upper left corner and select the desired region and project.</li><li id="as_01_0107__li129253152418">Under <strong id="as_01_0107__b16545193194617">Computing</strong>, click <strong id="as_01_0107__b755717315464">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_01_0107__b1155815313467">Instance Scaling</strong>. Then click the <strong id="as_01_0107__b1255911311466">AS Groups</strong> tab.</li><li id="as_01_0107__li6647531">In the AS group list, locate the row containing the target AS group and choose <strong id="as_01_0107__b326294419229">More</strong> &gt; <strong id="as_01_0107__b1072322648162420">Delete</strong> in the <strong id="as_01_0107__b2936649719229">Operation</strong> column.</li><li id="as_01_0107__li791511545113">In the displayed <strong id="as_01_0107__b84235270615160">Delete AS Group</strong> dialog box, click <strong id="as_01_0107__b842352706191722">Yes</strong>.</li></ol> <div class="section" id="as_01_0107__section1959939911151"><h4 class="sectiontitle">Procedure</h4><ol id="as_01_0107__ol52511872104959"><li id="as_01_0107__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_01_0107__li5914166211049">Click <span><img id="as_01_0107__image17990104385317" src="en-us_image_0210485079.png"></span> in the upper left corner and select the desired region and project.</li><li id="as_01_0107__li129253152418">Under <strong id="as_01_0107__b16545193194617">Computing</strong>, click <strong id="as_01_0107__b755717315464">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_01_0107__b1155815313467">Instance Scaling</strong>. Then click the <strong id="as_01_0107__b1255911311466">AS Groups</strong> tab.</li><li id="as_01_0107__li6647531">In the AS group list, locate the row containing the target AS group and choose <strong id="as_01_0107__b326294419229">More</strong> &gt; <strong id="as_01_0107__b1072322648162420">Delete</strong> in the <strong id="as_01_0107__b2936649719229">Operation</strong> column.</li><li id="as_01_0107__li791511545113">In the displayed <strong id="as_01_0107__b84235270615160">Delete AS Group</strong> dialog box, click <strong id="as_01_0107__b842352706191722">Yes</strong>.</li></ol>
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<a name="as_02_0101"></a><a name="as_02_0101"></a> <a name="as_02_0101"></a><a name="as_02_0101"></a>
<h1 class="topictitle1">Setting Up an Automatically Scalable Discuz! Forum</h1> <h1 class="topictitle1">Setting Up an Automatically Scalable Discuz! Forum</h1>
<div id="body1505096664598"><div class="section" id="as_02_0101__section57465090145856"><h4 class="sectiontitle">Overview</h4><p id="as_02_0101__p1599862915589">AS automatically adds instances to an AS group for applications and removes unneeded ones on demand. You do not need to prepare a large number of extra ECS instances for an expected marketing activity or unexpected peak hours. By eliminating the need to deploy those extra instances, AS ensures system reliability and reduces your operating costs.</p> <div id="body1505096664598"><div class="section" id="as_02_0101__section57465090145856"><h4 class="sectiontitle">Overview</h4><p id="as_02_0101__p1599862915589">AS automatically adds instances to an AS group for applications and removes unneeded ones on demand. You do not need to prepare a large number of extra ECS instances for expected marketing activities or unexpected peak hours. By eliminating the need to deploy those extra instances, AS ensures system reliability and reduces your operating costs.</p>
<p id="as_02_0101__p5100199015391">This section describes how to use services, such as AS, ECS, ELB, and VPC to deploy a web service that can be automatically scaled in and out, for example, a Discuz! forum.</p> <p id="as_02_0101__p5100199015391">This section describes how to use services, such as AS, ECS, ELB, and VPC to deploy a web service that can be automatically scaled in and out, for example, a Discuz! forum.</p>
<p id="as_02_0101__p3409979693316"><span><img class="vsd" id="as_02_0101__image376663429337" src="en-us_image_0077278626.png"></span></p> <p id="as_02_0101__p3409979693316"><span><img class="vsd" id="as_02_0101__image376663429337" src="en-us_image_0077278626.png"></span></p>
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<div class="section" id="as_02_0101__section72789851688"><h4 class="sectiontitle">Procedure</h4><p id="as_02_0101__p20526999113438"><strong id="as_02_0101__b842352706185641">Create an ECS and install a MySQL database.</strong></p> <div class="section" id="as_02_0101__section72789851688"><h4 class="sectiontitle">Procedure</h4><p id="as_02_0101__p20526999113438"><strong id="as_02_0101__b842352706185641">Create an ECS and install a MySQL database.</strong></p>
<p id="as_02_0101__p46047843144546">You can create a relational database using the Relational Database Service (RDS) service provided by the cloud platform, or create an ECS and install the database there. In this section, we will install a MySQL database on a newly created ECS.</p> <p id="as_02_0101__p46047843144546">You can create a relational database using the Relational Database Service (RDS) service provided by the cloud platform, or create an ECS and install the database there. In this section, we will install a MySQL database on a newly created ECS.</p>
<ol id="as_02_0101__ol14773980113641"><li id="as_02_0101__li4839386511380">Use the created VPC, security group, and EIP for the ECS you create. For instructions about how to create an ECS, see <em id="as_02_0101__i0411204598">Elastic Cloud Server User Guide</em><em id="as_02_0101__i866844125911"></em><em id="as_02_0101__i1665581214593"></em><em id="as_02_0101__i1924915270148"></em><em id="as_02_0101__i1884932018595"></em><em id="as_02_0101__i45342717187"></em>.</li><li id="as_02_0101__li65856956113641">When the status of the ECS changes to <strong id="as_02_0101__b84235270616471">Running</strong>, use Xftp or Xshell to log in to the ECS through its EIP, and install and configure a MySQL database.</li></ol> <ol id="as_02_0101__ol14773980113641"><li id="as_02_0101__li4839386511380">Use the created VPC, security group, and EIP for the ECS you create. For instructions about how to create an ECS, see <em id="as_02_0101__i0411204598">Elastic Cloud Server User Guide</em><em id="as_02_0101__i866844125911"></em><em id="as_02_0101__i1665581214593"></em><em id="as_02_0101__i1924915270148"></em><em id="as_02_0101__i1884932018595"></em><em id="as_02_0101__i121788205573"></em><em id="as_02_0101__i45342717187"></em><em id="as_02_0101__i178102211755"></em>.</li><li id="as_02_0101__li65856956113641">When the status of the ECS changes to <strong id="as_02_0101__b84235270616471">Running</strong>, use Xftp or Xshell to log in to the ECS through its EIP, and install and configure a MySQL database.</li></ol>
<div class="p" id="as_02_0101__p4774226171323"><strong id="as_02_0101__b756045747">Create an ECS and deploy a Discuz! forum on it.</strong><ol id="as_02_0101__ol5372058171451"><li id="as_02_0101__li13000299113922">Create an ECS but do not bind an EIP to it. For instructions about how to create an ECS, see <em id="as_02_0101__i1163118471716">Elastic Cloud Server User Guide</em><em id="as_02_0101__i1952683014592"></em><em id="as_02_0101__i75262030175917"></em><em id="as_02_0101__i73851156191514"></em><em id="as_02_0101__i18526163025918"></em><em id="as_02_0101__i028413226200"></em>.</li><li id="as_02_0101__li32799591113935">Unbind the EIP from the ECS where the MySQL database is installed and bind the EIP to the ECS where the Discuz! forum is to be deployed.<p id="as_02_0101__p54251053113937"><a name="as_02_0101__li32799591113935"></a><a name="li32799591113935"></a>You can access the MySQL database through a private network, so the EIP bound to the ECS where the MySQL database is installed can be unbound and then bound to the ECS where the Discuz! forum is to be deployed. This improves resource utilization. For detailed operations, see <em id="as_02_0101__i99764190363">Virtual Private Cloud User Guide</em><em id="as_02_0101__i2976141910368"></em><em id="as_02_0101__i159761919203619"></em><em id="as_02_0101__i13245157131819"></em><em id="as_02_0101__i20976181914365"></em>. After binding the EIP, you can access the ECS from the Internet and install various environments, such as PHP and Apache.</p> <div class="p" id="as_02_0101__p4774226171323"><strong id="as_02_0101__b1830268781">Create an ECS and deploy a Discuz! forum on it.</strong><ol id="as_02_0101__ol5372058171451"><li id="as_02_0101__li13000299113922">Create an ECS but do not bind an EIP to it. For instructions about how to create an ECS, see <em id="as_02_0101__i1438597314">Elastic Cloud Server User Guide</em><em id="as_02_0101__i18385573116"></em><em id="as_02_0101__i8385197917"></em><em id="as_02_0101__i138512720111"></em><em id="as_02_0101__i33851873111"></em><em id="as_02_0101__i18385271212"></em><em id="as_02_0101__i438597111"></em><em id="as_02_0101__i14385376111"></em><em id="as_02_0101__i93851579119"></em>.</li><li id="as_02_0101__li32799591113935">Unbind the EIP from the ECS where the MySQL database is installed and bind the EIP to the ECS where the Discuz! forum is to be deployed.<p id="as_02_0101__p54251053113937"><a name="as_02_0101__li32799591113935"></a><a name="li32799591113935"></a>You can access the MySQL database through a private network, so the EIP bound to the ECS where the MySQL database is installed can be unbound and then bound to the ECS where the Discuz! forum is to be deployed. This improves resource utilization. For detailed operations, see <em id="as_02_0101__i5204174518213">Virtual Private Cloud User Guide</em><em id="as_02_0101__i62052459219"></em><em id="as_02_0101__i1420512451225"></em><em id="as_02_0101__i102051745222"></em><em id="as_02_0101__i182051452216"></em><em id="as_02_0101__i12205545226"></em><em id="as_02_0101__i4205204511217"></em><em id="as_02_0101__i1720518451721"></em>. After binding the EIP, you can access the ECS from the Internet and install various environments, such as PHP and Apache.</p>
</li><li id="as_02_0101__li60971215173234">Deploy the forum.<p id="as_02_0101__p27293202173522"><a name="as_02_0101__li60971215173234"></a><a name="li60971215173234"></a>For instructions about how to deploy the Discuz! forum, see officially released Discuz! documentation. When configuring parameters, configure the private IP address of the ECS where the MySQL database is installed for the database server, and use the username and password authorized for remotely accessing the ECS where the MySQL database is installed to access the MySQL database. After the configuration is complete, you can unbind the EIP from the ECS where the forum is deployed to reduce resource usage.</p> </li><li id="as_02_0101__li60971215173234">Deploy the forum.<p id="as_02_0101__p27293202173522"><a name="as_02_0101__li60971215173234"></a><a name="li60971215173234"></a>To learn how to deploy the Discuz! forum, see the officially released Discuz! documentation. When configuring parameters, configure the private IP address of the ECS where the MySQL database is installed for the database server, and use the username and password authorized for remotely accessing the ECS where the MySQL database is installed to access the MySQL database. After the configuration is complete, you can unbind the EIP from the ECS where the forum is deployed to reduce resource usage.</p>
</li></ol> </li></ol>
</div> </div>
<p id="as_02_0101__p66585209174144"><strong id="as_02_0101__b842352706185656">Create a private image.</strong></p> <p id="as_02_0101__p66585209174144"><strong id="as_02_0101__b842352706185656">Create a private image.</strong></p>
<div class="p" id="as_02_0101__p5483719017446">Use the ECS where the Discuz! forum is deployed to create a private image. This private image is used to create the ECSs that will be used for capacity expansion.<ol id="as_02_0101__ol9459319174157"><li id="as_02_0101__li3164379174157">Only a stopped ECS can be used to create a private image, so stop the ECS where the Discuz! forum is deployed before creating a private image. For detailed operations, see <em id="as_02_0101__i786162413218">Elastic Cloud Server User Guide</em><em id="as_02_0101__i68611724627"></em><em id="as_02_0101__i8861162414214"></em><em id="as_02_0101__i2958102961914"></em><em id="as_02_0101__i1586112249220"></em><em id="as_02_0101__i11324191210561"></em>.</li><li id="as_02_0101__li55478818174845">Use the ECS to create a private image. For details, see <em id="as_02_0101__i1495412119916">Image Management Service User Guide</em><em id="as_02_0101__i5718142011917"></em><em id="as_02_0101__i024882816911"></em><em id="as_02_0101__i95051628122014"></em><em id="as_02_0101__i118181532891"></em><em id="as_02_0101__i2075578135714"></em>.</li></ol> <div class="p" id="as_02_0101__p5483719017446">Use the ECS where the Discuz! forum is deployed to create a private image. This private image is used to create the ECSs that will be used for capacity expansion.<ol id="as_02_0101__ol9459319174157"><li id="as_02_0101__li3164379174157">Only a stopped ECS can be used to create a private image. Stop the ECS where the Discuz! forum is deployed before creating a private image. For detailed operations, see <em id="as_02_0101__i1822471117516">Elastic Cloud Server User Guide</em><em id="as_02_0101__i62241811353"></em><em id="as_02_0101__i922413111353"></em><em id="as_02_0101__i172245111519"></em><em id="as_02_0101__i72252112516"></em><em id="as_02_0101__i1722514118518"></em><em id="as_02_0101__i1022510112054"></em><em id="as_02_0101__i922517111955"></em>.</li><li id="as_02_0101__li55478818174845">Use the ECS to create a private image. For details, see <em id="as_02_0101__i123269241077">Image Management Service User Guide</em><em id="as_02_0101__i15326724373"></em><em id="as_02_0101__i17326324472"></em><em id="as_02_0101__i10326172417713"></em><em id="as_02_0101__i183268248715"></em><em id="as_02_0101__i632615245715"></em><em id="as_02_0101__i3326102419718"></em><em id="as_02_0101__i932672417711"></em>.</li></ol>
</div> </div>
<p id="as_02_0101__p3087634317548"><strong id="as_02_0101__b84235270618577">Create an AS group.</strong></p> <p id="as_02_0101__p3087634317548"><strong id="as_02_0101__b84235270618577">Create an AS group.</strong></p>
<p id="as_02_0101__p12431791114137">An AS group consists of a collection of ECS instances, AS configurations, and AS policies that have similar attributes and apply to the same application scenario. An AS group is the basis for enabling or disabling AS policies and performing scaling actions. You must create an AS group to automatically add or remove ECS instances to match changes in traffic to the Discuz! forum.</p> <p id="as_02_0101__p12431791114137">An AS group consists of a collection of ECS instances, AS configurations, and AS policies that have similar attributes and apply to the same application scenario. An AS group is the basis for enabling or disabling AS policies and performing scaling actions. You must create an AS group to automatically add or remove ECS instances to match changes in traffic to the Discuz! forum.</p>
@ -25,7 +25,7 @@
<p id="as_02_0101__p5686965117549">The AS configuration lists the basic specifications of the ECSs to be automatically added to the AS group in a scaling action.</p> <p id="as_02_0101__p5686965117549">The AS configuration lists the basic specifications of the ECSs to be automatically added to the AS group in a scaling action.</p>
<p id="as_02_0101__p516457351806">For instructions about how to create an AS configuration, see <a href="as_02_0103.html">Creating an AS Configuration from a New Specifications Template</a>. During the configuration, select the private image you created in the preceding step. Configure other parameters based on service requirements.</p> <p id="as_02_0101__p516457351806">For instructions about how to create an AS configuration, see <a href="as_02_0103.html">Creating an AS Configuration from a New Specifications Template</a>. During the configuration, select the private image you created in the preceding step. Configure other parameters based on service requirements.</p>
<p id="as_02_0101__p15002706141638"><strong id="as_02_0101__b842352706185743">Manually add the ECS to the AS group.</strong></p> <p id="as_02_0101__p15002706141638"><strong id="as_02_0101__b842352706185743">Manually add the ECS to the AS group.</strong></p>
<p id="as_02_0101__p7693526141832">On the page providing details about the AS group, click the <strong id="as_02_0101__b18169122111716">Instances</strong> tab and then <strong id="as_02_0101__b11170522171720">Add</strong> to add the ECS where the Discuz! forum is deployed to the AS group. For details, see <a href="as_04_0103.html">Manual Scaling</a>. You can enable instance protection on this ECS so that it will not be automatically removed from the AS group.</p> <p id="as_02_0101__p7693526141832">On the page providing details about the AS group, click the <strong id="as_02_0101__b18169122111716">Instances</strong> tab and then <strong id="as_02_0101__b11170522171720">Add</strong> to add the ECS where the Discuz! forum is deployed to the AS group. For details, see <a href="as_04_0103.html">Manual Scaling</a>. You can enable instance protection for this ECS so that it will not be automatically removed from the AS group.</p>
<p id="as_02_0101__p82627518240"><strong id="as_02_0101__b842352706185755">Create an AS policy.</strong></p> <p id="as_02_0101__p82627518240"><strong id="as_02_0101__b842352706185755">Create an AS policy.</strong></p>
<p id="as_02_0101__p48573106143225">An AS policy specifies the conditions for triggering a scaling action. After you create an AS policy for the AS group, AS automatically increases or decreases the number of instances based on the policy.</p> <p id="as_02_0101__p48573106143225">An AS policy specifies the conditions for triggering a scaling action. After you create an AS policy for the AS group, AS automatically increases or decreases the number of instances based on the policy.</p>
<p id="as_02_0101__p66475082143347">You can configure an alarm-based AS policy. When Cloud Eye generates an alarm for a monitoring metric, such as vCPU usage, AS automatically increases or decreases the number of instances in the AS group. If traffic fluctuations are predictable, you can also configure a scheduled or periodic AS policy.</p> <p id="as_02_0101__p66475082143347">You can configure an alarm-based AS policy. When Cloud Eye generates an alarm for a monitoring metric, such as vCPU usage, AS automatically increases or decreases the number of instances in the AS group. If traffic fluctuations are predictable, you can also configure a scheduled or periodic AS policy.</p>

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<a name="as_02_0102"></a><a name="as_02_0102"></a> <a name="as_02_0102"></a><a name="as_02_0102"></a>
<h1 class="topictitle1">Creating an AS Configuration from an Existing ECS Instance</h1> <h1 class="topictitle1">Creating an AS Configuration from an Existing ECS Instance</h1>
<div id="body9426010"><div class="section" id="as_02_0102__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_02_0102__p10702103311281">You can use an existing ECS instance to rapidly create an AS configuration. In such a case, the parameter settings, such as the vCPUs, memory, image, disk, and ECS type in the AS configuration are the same as those of the selected instance by default.</p> <div id="body9426010"><div class="section" id="as_02_0102__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_02_0102__p10702103311281">You can use an existing ECS instance to rapidly create an AS configuration. In such a case, the parameter settings, such as the ECS type, vCPUs, memory, image, and disk settings (including size, type, encryption, and key) in the AS configuration are the same as those of the selected instance by default.</p>
</div> </div>
<div class="section" id="as_02_0102__section1657416306249"><h4 class="sectiontitle">Procedure</h4><ol id="as_02_0102__ol61231749172811"><li id="as_02_0102__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_02_0102__li5914166211049">Click <span><img id="as_02_0102__image1494812412565" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_02_0102__li207990092618">Under <strong id="as_02_0102__b1840444933714">Computing</strong>, click <strong id="as_02_0102__b14069498375">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_02_0102__b7407184918379">Instance Scaling</strong>.</li><li id="as_02_0102__li26457778">Click <strong id="as_02_0102__b20409745161312">Create AS Configuration</strong>.</li><li id="as_02_0102__li36793414">Set the parameters for the AS configuration. <a href="#as_02_0102__table27476571">Table 1</a> lists the AS configuration parameters. <div class="section" id="as_02_0102__section1657416306249"><h4 class="sectiontitle">Procedure</h4><ol id="as_02_0102__ol61231749172811"><li id="as_02_0102__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_02_0102__li5914166211049">Click <span><img id="as_02_0102__image1494812412565" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_02_0102__li207990092618">Under <strong id="as_02_0102__b1840444933714">Computing</strong>, click <strong id="as_02_0102__b14069498375">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_02_0102__b7407184918379">Instance Scaling</strong>.</li><li id="as_02_0102__li26457778">Click <strong id="as_02_0102__b20409745161312">Create AS Configuration</strong>.</li><li id="as_02_0102__li36793414">Set the parameters for the AS configuration. <a href="#as_02_0102__table27476571">Table 1</a> lists the AS configuration parameters.
<div class="tablenoborder"><a name="as_02_0102__table27476571"></a><a name="table27476571"></a><table cellpadding="4" cellspacing="0" summary="" id="as_02_0102__table27476571" frame="border" border="1" rules="all"><caption><b>Table 1 </b>AS configuration parameters</caption><thead align="left"><tr id="as_02_0102__row32016662"><th align="left" class="cellrowborder" valign="top" width="19.189999999999998%" id="mcps1.3.2.2.5.2.2.4.1.1"><p id="as_02_0102__p43212834">Parameter</p> <div class="tablenoborder"><a name="as_02_0102__table27476571"></a><a name="table27476571"></a><table cellpadding="4" cellspacing="0" summary="" id="as_02_0102__table27476571" frame="border" border="1" rules="all"><caption><b>Table 1 </b>AS configuration parameters</caption><thead align="left"><tr id="as_02_0102__row32016662"><th align="left" class="cellrowborder" valign="top" width="19.189999999999998%" id="mcps1.3.2.2.5.2.2.4.1.1"><p id="as_02_0102__p43212834">Parameter</p>
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</tr> </tr>
<tr id="as_02_0102__row16041657"><td class="cellrowborder" valign="top" width="19.189999999999998%" headers="mcps1.3.2.2.5.2.2.4.1.1 "><p id="as_02_0102__p24305815">Configuration Template</p> <tr id="as_02_0102__row16041657"><td class="cellrowborder" valign="top" width="19.189999999999998%" headers="mcps1.3.2.2.5.2.2.4.1.1 "><p id="as_02_0102__p24305815">Configuration Template</p>
</td> </td>
<td class="cellrowborder" valign="top" width="61.5%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><p id="as_02_0102__p59011025101558">Select <strong id="as_02_0102__b106759141360">Use specifications of an existing ECS</strong> &gt; <strong id="as_02_0102__b1358210298362">Select ECS</strong>. </p> <td class="cellrowborder" valign="top" width="61.5%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><p id="as_02_0102__p59011025101558">Choose <strong id="as_02_0102__b106759141360">Use specifications of an existing ECS</strong> &gt; <strong id="as_02_0102__b1358210298362">Select ECS</strong>.</p>
<p id="as_02_0102__p32378487175332">The ECS type, vCPUs, memory, image, and disk information in the AS configuration are the same as those of the selected ECS by default. </p> <p id="as_02_0102__p32378487175332">In such a case, the parameter settings, such as the ECS type, vCPUs, memory, image, and disk settings (including size, type, encryption, and key) in the AS configuration are the same as those of the selected instance by default. </p>
</td> </td>
<td class="cellrowborder" valign="top" width="19.31%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0102__p59638115">Use specifications of an existing ECS</p> <td class="cellrowborder" valign="top" width="19.31%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0102__p59638115">Use specifications of an existing ECS</p>
</td> </td>
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</div></div> </div></div>
</li></ul> </li></ul>
</td> </td>
<td class="cellrowborder" valign="top" width="19.31%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0102__p95377487227">-</p> <td class="cellrowborder" valign="top" width="19.31%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0102__p95377487227">N/A</p>
</td> </td>
</tr> </tr>
</tbody> </tbody>

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<tr id="as_02_0103__row32564048145822"><td class="cellrowborder" valign="top" width="19.400000000000002%" headers="mcps1.3.2.2.5.2.2.4.1.1 "><p id="as_02_0103__p1738024812366">Specifications</p> <tr id="as_02_0103__row32564048145822"><td class="cellrowborder" valign="top" width="19.400000000000002%" headers="mcps1.3.2.2.5.2.2.4.1.1 "><p id="as_02_0103__p1738024812366">Specifications</p>
</td> </td>
<td class="cellrowborder" valign="top" width="55.480000000000004%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><p id="as_02_0103__p1284784410497">The public cloud provides various ECS types for different application scenarios.</p> <td class="cellrowborder" valign="top" width="55.480000000000004%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><p id="as_02_0103__p1284784410497">The public cloud provides various ECS types for different application scenarios.</p>
<p id="as_02_0103__p61271243145822">For more information, see <em id="as_02_0103__i1188914381914"></em><em id="as_02_0103__i58891634190"></em><em id="as_02_0103__i388933101913">Elastic Cloud Server User Guide</em><em id="as_02_0103__i1188916315199"></em><em id="as_02_0103__i161582321614"></em><em id="as_02_0103__i16889173171910"></em>.</p> <p id="as_02_0103__p61271243145822">For more information, see <em id="as_02_0103__i1188914381914"></em><em id="as_02_0103__i58891634190"></em><em id="as_02_0103__i388933101913">Elastic Cloud Server User Guide</em><em id="as_02_0103__i1188916315199"></em><em id="as_02_0103__i161582321614"></em><em id="as_02_0103__i16889173171910"></em><em id="as_02_0103__i139291302323"></em>.</p>
<p id="as_02_0103__p14570276145822">Configure the ECS specifications, including vCPUs, memory, image type, and disk, according to the ECS type.</p> <p id="as_02_0103__p14570276145822">Configure the ECS specifications, including vCPUs, memory, image type, and disk, according to the ECS type.</p>
</td> </td>
<td class="cellrowborder" valign="top" width="25.120000000000005%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0103__p39341736145822">Memory-optimized ECS</p> <td class="cellrowborder" valign="top" width="25.120000000000005%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0103__p39341736145822">Memory-optimized ECS</p>
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</tr> </tr>
<tr id="as_02_0103__row5315896145822"><td class="cellrowborder" valign="top" width="19.400000000000002%" headers="mcps1.3.2.2.5.2.2.4.1.1 "><p id="as_02_0103__p25442194145822">Disk</p> <tr id="as_02_0103__row5315896145822"><td class="cellrowborder" valign="top" width="19.400000000000002%" headers="mcps1.3.2.2.5.2.2.4.1.1 "><p id="as_02_0103__p25442194145822">Disk</p>
</td> </td>
<td class="cellrowborder" valign="top" width="55.480000000000004%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><div class="p" id="as_02_0103__p32166422145822">Includes system disks and data disks. <ul id="as_02_0103__ul21763225564"><li id="as_02_0103__li131764228565"><strong id="as_02_0103__b117116611815">System Disk</strong><p id="as_02_0103__p15176152285615"><strong id="as_02_0103__b842352706172120">Common I/O</strong>: uses Serial Advanced Technology Attachment (SATA) drives to store data.</p> <td class="cellrowborder" valign="top" width="55.480000000000004%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><div class="p" id="as_02_0103__p32166422145822">Includes system and data disks. <ul id="as_02_0103__ul21763225564"><li id="as_02_0103__li131764228565"><strong id="as_02_0103__b117116611815">System Disk</strong><p id="as_02_0103__p15176152285615"><strong id="as_02_0103__b842352706172120">Common I/O</strong>: uses Serial Advanced Technology Attachment (SATA) drives to store data.</p>
<p id="as_02_0103__p18176722105616"><strong id="as_02_0103__b842352706172150">High I/O</strong>: uses serial attached SCSI (SAS) drives to store data.</p> <p id="as_02_0103__p18176722105616"><strong id="as_02_0103__b842352706172150">High I/O</strong>: uses serial attached SCSI (SAS) drives to store data.</p>
<p id="as_02_0103__p1917642219563"><strong id="as_02_0103__b1379415321714">Ultra-high I/O</strong>: uses solid state disk (SSD) drives to store data.</p> <p id="as_02_0103__p1917642219563"><strong id="as_02_0103__b1379415321714">Ultra-high I/O</strong>: uses solid state disk (SSD) drives to store data.</p>
<p id="as_02_0103__p817618229565">If the image based on which an ECS is created is encrypted, the system disk of the ECS is automatically encrypted. In addition, the name of the encrypted key is displayed on the page.</p> <p id="as_02_0103__p817618229565">If the image based on which an ECS is created is encrypted, the system disk of the ECS is automatically encrypted. In addition, the name of the encrypted key is displayed on the page.</p>
</li></ul> </li></ul>
</div> </div>
<ul id="as_02_0103__ul11528273145822"><li id="as_02_0103__li16194000145822"><strong id="as_02_0103__b1914510113816">Data Disk</strong><p id="as_02_0103__p2766165812449">You can create multiple data disks for an ECS instance. In addition, you can specify a data disk image for exporting data.</p> <ul id="as_02_0103__ul11528273145822"><li id="as_02_0103__li16194000145822"><strong id="as_02_0103__b1914510113816">Data Disk</strong><p id="as_02_0103__p2766165812449">You can create multiple data disks for an ECS instance and encrypt them. In addition, you can specify a data disk image for exporting data.</p>
<p id="as_02_0103__p55343398145822">When encrypting a data disk, select <strong id="as_02_0103__b842352706154539">Encryption</strong> for it. KMS access rights must be granted to EVS for using the encryption feature. If you have rights granting permission, grant the KMS access rights to EVS. If you do not have the permission, contact the user having the security administrator rights to grant the KMS access rights. For details, see <em id="as_02_0103__i699196202">Identity and Access Management User Guide</em>.</p> <p id="as_02_0103__p55343398145822">When encrypting a data disk, select <strong id="as_02_0103__b842352706154539">Encryption</strong> for it. KMS access rights must be granted to EVS for using the encryption feature. If you have rights granting permission, grant the KMS access rights to EVS. If you do not have the permission, contact the user having the security administrator rights to grant the KMS access rights. For details, see <em id="as_02_0103__i894359783">Identity and Access Management User Guide</em>.</p>
<ul id="as_02_0103__ul49081691145822"><li id="as_02_0103__li28328536145822"><strong id="as_02_0103__b1991840965">Xrole Name: EVSAccessKMS</strong>: indicates that EVS has obtained the KMS access rights.</li><li id="as_02_0103__li53630234145822"><strong id="as_02_0103__b1269724404">KMS Key Name</strong>: specifies the name of the key used by the encrypted data disk. By default, the name is <strong id="as_02_0103__b2117689980">evs/default</strong>.</li><li id="as_02_0103__li12910061145822"><strong id="as_02_0103__b842352706155046">KMS Key ID</strong>: specifies the ID of the key used by the encrypted data disk.</li></ul> <ul id="as_02_0103__ul49081691145822"><li id="as_02_0103__li28328536145822"><strong id="as_02_0103__b1121191229">Xrole Name: EVSAccessKMS</strong>: indicates that EVS has obtained the KMS access rights.</li><li id="as_02_0103__li53630234145822"><strong id="as_02_0103__b2027478093">KMS Key Name</strong>: specifies the name of the key used by the encrypted data disk. By default, the name is <strong id="as_02_0103__b877168901">evs/default</strong>.</li><li id="as_02_0103__li12910061145822"><strong id="as_02_0103__b842352706155046">KMS Key ID</strong>: specifies the ID of the key used by the encrypted data disk.</li></ul>
<p id="as_02_0103__p39082035145822">For more information about EVS disk encryption, see <em id="as_02_0103__i842352697115514">Elastic Volume Service User Guide</em>.</p> <p id="as_02_0103__p39082035145822">For more information about EVS disk encryption, see <em id="as_02_0103__i842352697115514">Elastic Volume Service User Guide</em>.</p>
</li></ul> </li></ul>
</td> </td>
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</td> </td>
<td class="cellrowborder" valign="top" width="55.480000000000004%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><p id="as_02_0103__p50083153145822">An EIP is a static public IP address bound to an ECS in a VPC. Using the EIP, the ECS provides services externally.</p> <td class="cellrowborder" valign="top" width="55.480000000000004%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><p id="as_02_0103__p50083153145822">An EIP is a static public IP address bound to an ECS in a VPC. Using the EIP, the ECS provides services externally.</p>
<p id="as_02_0103__p48095200145822">The following options are provided:</p> <p id="as_02_0103__p48095200145822">The following options are provided:</p>
<ul id="as_02_0103__ul30574237145822"><li id="as_02_0103__li30203621145822"><strong id="as_02_0103__b109070192042">Do not use</strong><p id="as_02_0103__p18849270192044">An ECS without an EIP cannot access the Internet. However, it can still be used as a service ECS or deployed in a cluster on a private network.</p> <ul id="as_02_0103__ul30574237145822"><li id="as_02_0103__li30203621145822"><strong id="as_02_0103__b109070192042">Do not use</strong>: An ECS without an EIP cannot access the Internet. However, it can still be used as a service ECS or deployed in a cluster on a private network.</li><li id="as_02_0103__li1792184214559"><strong id="as_02_0103__b65370391183">Automatically assign</strong>: An EIP with a dedicated bandwidth is automatically assigned to each ECS. You can set the bandwidth size. If you select <strong id="as_02_0103__b3484144012210">Automatically assign</strong>, you need to specify <strong id="as_02_0103__b448704012224">EIP Type</strong>, <strong id="as_02_0103__b15490174072215">Billed By</strong>, and <strong id="as_02_0103__b1449254017222">Bandwidth</strong>.</li></ul>
</li><li id="as_02_0103__li1792184214559"><strong id="as_02_0103__b65370391183">Automatically assign</strong><p id="as_02_0103__p1472011411189">An EIP with a dedicated bandwidth is automatically assigned to each ECS. You can set the bandwidth size.</p>
</li></ul>
</td> </td>
<td class="cellrowborder" valign="top" width="25.120000000000005%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0103__p60594146145822">Automatically assign</p> <td class="cellrowborder" valign="top" width="25.120000000000005%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0103__p60594146145822">Automatically assign</p>
</td> </td>
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</tr> </tr>
<tr id="as_02_0103__row169972316201"><td class="cellrowborder" valign="top" width="19.400000000000002%" headers="mcps1.3.2.2.5.2.2.4.1.1 "><p id="as_02_0103__p199981314203">Advanced Settings</p> <tr id="as_02_0103__row169972316201"><td class="cellrowborder" valign="top" width="19.400000000000002%" headers="mcps1.3.2.2.5.2.2.4.1.1 "><p id="as_02_0103__p199981314203">Advanced Settings</p>
</td> </td>
<td class="cellrowborder" valign="top" width="55.480000000000004%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><p id="as_02_0103__p12120173110500">This parameter allows you to configure and <strong id="as_02_0103__b97191811955">User Data</strong>.</p> <td class="cellrowborder" valign="top" width="55.480000000000004%" headers="mcps1.3.2.2.5.2.2.4.1.2 "><p id="as_02_0103__p12120173110500">This parameter allows you to configure <strong id="as_02_0103__b97191811955">User Data</strong>.</p>
<p id="as_02_0103__p152801338145112">You can select <strong id="as_02_0103__b3974104514363">Do not configure</strong> or <strong id="as_02_0103__b797514458361">Configure now</strong>.</p> <p id="as_02_0103__p152801338145112">You can select <strong id="as_02_0103__b3974104514363">Do not configure</strong> or <strong id="as_02_0103__b797514458361">Configure now</strong>.</p>
</td> </td>
<td class="cellrowborder" valign="top" width="25.120000000000005%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0103__p11998123172016">N/A</p> <td class="cellrowborder" valign="top" width="25.120000000000005%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0103__p11998123172016">N/A</p>
@ -129,7 +127,7 @@
</div></div> </div></div>
</li></ul> </li></ul>
</td> </td>
<td class="cellrowborder" valign="top" width="25.120000000000005%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0103__p95377487227">-</p> <td class="cellrowborder" valign="top" width="25.120000000000005%" headers="mcps1.3.2.2.5.2.2.4.1.3 "><p id="as_02_0103__p95377487227">N/A</p>
</td> </td>
</tr> </tr>
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<a name="as_02_0105"></a><a name="as_02_0105"></a> <a name="as_02_0105"></a><a name="as_02_0105"></a>
<h1 class="topictitle1">Deleting an AS Configuration</h1> <h1 class="topictitle1">Deleting an AS Configuration</h1>
<div id="body2026335"><div class="section" id="as_02_0105__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_02_0105__p37373550113048">When you no longer need an AS configuration, you can delete it as long as the AS configuration is not used by an AS group. You can delete a single AS configuration or delete them batches.</p> <div id="body2026335"><div class="section" id="as_02_0105__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_02_0105__p37373550113048">When you no longer need an AS configuration, you can delete it as long as the AS configuration is not used by an AS group. You can delete a single AS configuration or delete them in batches.</p>
</div> </div>
<div class="section" id="as_02_0105__section1657416306249"><h4 class="sectiontitle">Procedure</h4><ol id="as_02_0105__ol1107452"><li id="as_02_0105__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_02_0105__li5914166211049">Click <span><img id="as_02_0105__image179401228344" src="en-us_image_0210485079.png"></span> in the upper left corner and select the desired region and project.</li><li id="as_02_0105__li23412051162913">Under <strong id="as_02_0105__b611824532518">Computing</strong>, click <strong id="as_02_0105__b4121445152514">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_02_0105__b131226454252">Instance Scaling</strong>.</li><li id="as_02_0105__li803253">Click the <strong id="as_02_0105__b842352706173452">AS Configurations</strong> tab page, locate the row containing the target AS configuration, and click <strong id="as_02_0105__b842352706173526">Delete</strong> in the <strong id="as_02_0105__b842352706173529">Operation</strong> column to delete this AS configuration. You can also select multiple AS configurations to be deleted and click <strong id="as_02_0105__b84235270617444">Delete</strong> in the upper part of the AS configuration list to delete them all at once.</li></ol> <div class="section" id="as_02_0105__section1657416306249"><h4 class="sectiontitle">Procedure</h4><ol id="as_02_0105__ol1107452"><li id="as_02_0105__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_02_0105__li5914166211049">Click <span><img id="as_02_0105__image179401228344" src="en-us_image_0210485079.png"></span> in the upper left corner and select the desired region and project.</li><li id="as_02_0105__li23412051162913">Under <strong id="as_02_0105__b611824532518">Computing</strong>, click <strong id="as_02_0105__b4121445152514">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_02_0105__b131226454252">Instance Scaling</strong>.</li><li id="as_02_0105__li803253">Click the <strong id="as_02_0105__b842352706173452">AS Configurations</strong> tab page, locate the row containing the target AS configuration, and click <strong id="as_02_0105__b842352706173526">Delete</strong> in the <strong id="as_02_0105__b842352706173529">Operation</strong> column to delete this AS configuration. You can also select multiple AS configurations to be deleted and click <strong id="as_02_0105__b84235270617444">Delete</strong> in the upper part of the AS configuration list to delete them all at once.</li></ol>
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<div class="section" id="as_03_0103__section6367887185112"><h4 class="sectiontitle">Disabling an AS Policy</h4><p id="as_03_0103__p5771493385112">If you do not want a particular AS policy to trigger any scaling actions within a specified period of time, you can disable it.</p> <div class="section" id="as_03_0103__section6367887185112"><h4 class="sectiontitle">Disabling an AS Policy</h4><p id="as_03_0103__p5771493385112">If you do not want a particular AS policy to trigger any scaling actions within a specified period of time, you can disable it.</p>
<ul id="as_03_0103__ul4967235785112"><li id="as_03_0103__li4439803685112">If all of the AS policies configured for an AS group are disabled, no scaling action will be triggered for this AS group. However, if you manually change the value of <strong id="as_03_0103__b51351353192252">Expected Instances</strong>, a scaling action will still be triggered.</li><li id="as_03_0103__li6403801285112">You can disable an AS policy only when its status is <strong id="as_03_0103__b65818957192252">Enabled</strong>.</li></ul> <ul id="as_03_0103__ul4967235785112"><li id="as_03_0103__li4439803685112">If all of the AS policies configured for an AS group are disabled, no scaling action will be triggered for this AS group. However, if you manually change the value of <strong id="as_03_0103__b51351353192252">Expected Instances</strong>, a scaling action will still be triggered.</li><li id="as_03_0103__li6403801285112">You can disable an AS policy only when its status is <strong id="as_03_0103__b65818957192252">Enabled</strong>.</li></ul>
<p id="as_03_0103__p3947119685112">Locate the row containing the target AS group and click <strong id="as_03_0103__b667748863">View AS Policy</strong> in the <strong id="as_03_0103__b1806672745">Operation</strong> column. On the displayed page, locate the row containing the target AS policy and click <strong id="as_03_0103__b571893315">Disable</strong> in the <strong id="as_03_0103__b1513842090">Operation</strong> column. To concurrently disable multiple AS policies, select these AS policies and click <strong id="as_03_0103__b994580921">Disable</strong> in the upper part of the AS policy list.</p> <p id="as_03_0103__p3947119685112">Locate the row containing the target AS group and click <strong id="as_03_0103__b109812987">View AS Policy</strong> in the <strong id="as_03_0103__b399660504">Operation</strong> column. On the displayed page, locate the row containing the target AS policy and click <strong id="as_03_0103__b43208007">Disable</strong> in the <strong id="as_03_0103__b1347491051">Operation</strong> column. To concurrently disable multiple AS policies, select these AS policies and click <strong id="as_03_0103__b308520640">Disable</strong> in the upper part of the AS policy list.</p>
</div> </div>
<div class="section" id="as_03_0103__section1969644685112"><h4 class="sectiontitle">Manually Executing an AS Policy</h4><p id="as_03_0103__p4133284512421">You can make the number of instances in an AS group reach the expected number of instances immediately by manually executing an AS policy.</p> <div class="section" id="as_03_0103__section1969644685112"><h4 class="sectiontitle">Manually Executing an AS Policy</h4><p id="as_03_0103__p4133284512421">You can make the number of instances in an AS group reach the expected number of instances immediately by manually executing an AS policy.</p>
<ul id="as_03_0103__ul64891355112319"><li id="as_03_0103__li1348985516231">You can manually execute an AS policy if the scaling conditions configured in the AS policy are not met.</li><li id="as_03_0103__li1748955514234">You can manually execute an AS policy only when the AS group and AS policy are both in <strong id="as_03_0103__b24113993192252">Enabled</strong> state.<p id="as_03_0103__p94891055192311">Locate the row containing the target AS group and click <strong id="as_03_0103__b7076413192252">View AS Policy</strong> in the <strong id="as_03_0103__b63687724192252">Operation</strong> column. On the displayed page, locate the row containing the target AS policy and click <strong id="as_03_0103__b1155421199204445">Execute Now</strong> in the <strong id="as_03_0103__b42198048815417">Operation</strong> column.</p> <ul id="as_03_0103__ul64891355112319"><li id="as_03_0103__li1348985516231">You can manually execute an AS policy if the scaling conditions configured in the AS policy are not met.</li><li id="as_03_0103__li1748955514234">You can manually execute an AS policy only when the AS group and AS policy are both in <strong id="as_03_0103__b24113993192252">Enabled</strong> state.<p id="as_03_0103__p94891055192311">Locate the row containing the target AS group and click <strong id="as_03_0103__b7076413192252">View AS Policy</strong> in the <strong id="as_03_0103__b63687724192252">Operation</strong> column. On the displayed page, locate the row containing the target AS policy and click <strong id="as_03_0103__b1155421199204445">Execute Now</strong> in the <strong id="as_03_0103__b42198048815417">Operation</strong> column.</p>
@ -21,8 +21,8 @@
</div> </div>
<div class="section" id="as_03_0103__section353374285112"><h4 class="sectiontitle">Deleting an AS Policy</h4><p id="as_03_0103__p1779772085112">You can delete an AS policy that will not be used for triggering scaling actions.</p> <div class="section" id="as_03_0103__section353374285112"><h4 class="sectiontitle">Deleting an AS Policy</h4><p id="as_03_0103__p1779772085112">You can delete an AS policy that will not be used for triggering scaling actions.</p>
<p id="as_03_0103__p20245643145412">An AS policy can be deleted even when the scaling action triggered by the policy is in progress. Deleting the AS policy does not affect a scaling action that has already started.</p> <p id="as_03_0103__p20245643145412">An AS policy can be deleted even when the scaling action triggered by the policy is in progress. Deleting the AS policy does not affect a scaling action that has already started.</p>
<p id="as_03_0103__p142300685112">Locate the row containing the target AS group and click <strong id="as_03_0103__b1961245039">View AS Policy</strong> in the <strong id="as_03_0103__b1231255958">Operation</strong> column. On the displayed page, locate the row containing the target AS policy and choose <strong id="as_03_0103__b1853782234">More</strong> &gt; <strong id="as_03_0103__b466786811">Delete</strong> in the <strong id="as_03_0103__b13245524">Operation</strong> column.</p> <p id="as_03_0103__p142300685112">Locate the row containing the target AS group and click <strong id="as_03_0103__b380303454">View AS Policy</strong> in the <strong id="as_03_0103__b377774115">Operation</strong> column. On the displayed page, locate the row containing the target AS policy and choose <strong id="as_03_0103__b2122414179">More</strong> &gt; <strong id="as_03_0103__b696555358">Delete</strong> in the <strong id="as_03_0103__b554578394">Operation</strong> column.</p>
<p id="as_03_0103__p467171014193">To concurrently delete multiple AS policies, select these AS policies and click <strong id="as_03_0103__b460313961">Delete</strong> in the upper part of the AS policy list.</p> <p id="as_03_0103__p467171014193">To concurrently delete multiple AS policies, select these AS policies and click <strong id="as_03_0103__b261572427">Delete</strong> in the upper part of the AS policy list.</p>
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<a name="as_04_0103"></a><a name="as_04_0103"></a> <a name="as_04_0103"></a><a name="as_04_0103"></a>
<h1 class="topictitle1">Manual Scaling</h1> <h1 class="topictitle1">Manual Scaling</h1>
<div id="body43320496"><div class="section" id="as_04_0103__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_04_0103__p63592346">You can manually add or remove instances to or from an AS group, or changing the expected number of instances.</p> <div id="body43320496"><div class="section" id="as_04_0103__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_04_0103__p63592346">You can manually add or remove instances to or from an AS group, or change the expected number of instances.</p>
</div> </div>
<div class="section" id="as_04_0103__section53233117153934"><h4 class="sectiontitle">Procedure</h4><p id="as_04_0103__p1952357615401"><strong id="as_04_0103__b842352706183930">Adding instances to an AS group</strong></p> <div class="section" id="as_04_0103__section53233117153934"><h4 class="sectiontitle">Procedure</h4><p id="as_04_0103__p1952357615401"><strong id="as_04_0103__b842352706183930">Adding instances to an AS group</strong></p>
</div> </div>
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<p id="as_04_0103__p49035653154124">There are some restrictions on instance removal:</p> <p id="as_04_0103__p49035653154124">There are some restrictions on instance removal:</p>
<ul id="as_04_0103__ul38667698154124"><li id="as_04_0103__li2692496616239">The AS group cannot have a scaling action in progress, the instances must be enabled, and the total number of instances after removal cannot be less than the minimum number of instances specified.</li><li id="as_04_0103__li197481649115012">Instances can be removed from an AS group and deleted only if the AS group has no scaling action ongoing, and the instances are automatically created and enabled, and are not used by Storage Disaster Recovery Service (SDRS).</li><li id="as_04_0103__li5758880191635">Instances manually added to an AS group can only be removed. They cannot be removed and deleted.</li><li id="as_04_0103__li185881562417">A maximum of 10 instances can be removed at a time.</li></ul> <ul id="as_04_0103__ul38667698154124"><li id="as_04_0103__li2692496616239">The AS group cannot have a scaling action in progress, the instances must be enabled, and the total number of instances after removal cannot be less than the minimum number of instances specified.</li><li id="as_04_0103__li197481649115012">Instances can be removed from an AS group and deleted only if the AS group has no scaling action ongoing, and the instances are automatically created and enabled, and are not used by Storage Disaster Recovery Service (SDRS).</li><li id="as_04_0103__li5758880191635">Instances manually added to an AS group can only be removed. They cannot be removed and deleted.</li><li id="as_04_0103__li185881562417">A maximum of 10 instances can be removed at a time.</li></ul>
<p id="as_04_0103__p11869369154124">To remove an instance from an AS group, perform the following steps:</p> <p id="as_04_0103__p11869369154124">To remove an instance from an AS group, perform the following steps:</p>
<ol id="as_04_0103__ol39715459154124"><li id="as_04_0103__li3880610183611">Under <strong id="as_04_0103__b263195442812">Computing</strong>, click <strong id="as_04_0103__b863413542288">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_04_0103__b163518545280">Instance Scaling</strong>.</li><li id="as_04_0103__li62835592154124">Click the <strong id="as_04_0103__b1647743492">AS Groups</strong> tab and then the name of the target AS group.</li><li id="as_04_0103__li28649422154124">Click the <strong id="as_04_0103__b25108545115548">Instances</strong> tab, locate the row containing the target instance, and click <strong id="as_04_0103__b24650320115548">Remove</strong> or <strong id="as_04_0103__b20526296115548">Remove and Delete</strong> in the <strong id="as_04_0103__b50518936115548">Operation</strong> column.</li><li id="as_04_0103__li56518206154124">To delete multiple instances from an AS group, select the check boxes in front of them and click <strong id="as_04_0103__b322913510443">Remove</strong> or <strong id="as_04_0103__b132301564416">Remove and Delete</strong>.</li></ol> <ol id="as_04_0103__ol39715459154124"><li id="as_04_0103__li3880610183611">Under <strong id="as_04_0103__b263195442812">Computing</strong>, click <strong id="as_04_0103__b863413542288">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_04_0103__b163518545280">Instance Scaling</strong>.</li><li id="as_04_0103__li62835592154124">Click the <strong id="as_04_0103__b1053046595">AS Groups</strong> tab and then the name of the target AS group.</li><li id="as_04_0103__li28649422154124">Click the <strong id="as_04_0103__b25108545115548">Instances</strong> tab, locate the row containing the target instance, and click <strong id="as_04_0103__b24650320115548">Remove</strong> or <strong id="as_04_0103__b20526296115548">Remove and Delete</strong> in the <strong id="as_04_0103__b50518936115548">Operation</strong> column.</li><li id="as_04_0103__li56518206154124">To delete multiple instances from an AS group, select the check boxes in front of them and click <strong id="as_04_0103__b322913510443">Remove</strong> or <strong id="as_04_0103__b132301564416">Remove and Delete</strong>.</li></ol>
<p id="as_04_0103__p38901811154124">To delete all instances from an AS group, select the check box on the left of <strong id="as_04_0103__b842352706115522">Name</strong> and click <strong id="as_04_0103__b4317258416">Remove</strong> or <strong id="as_04_0103__b11742510414">Remove and Delete</strong>.</p> <p id="as_04_0103__p38901811154124">To delete all instances from an AS group, select the check box on the left of <strong id="as_04_0103__b842352706115522">Name</strong> and click <strong id="as_04_0103__b4317258416">Remove</strong> or <strong id="as_04_0103__b11742510414">Remove and Delete</strong>.</p>
<p id="as_04_0103__p39393290154127"><strong id="as_04_0103__b842352706184035">Changing the expected number of instances</strong></p> <p id="as_04_0103__p39393290154127"><strong id="as_04_0103__b842352706184035">Changing the expected number of instances</strong></p>
<p id="as_04_0103__p2367843414232">Manually change the expected number of instances to add or reduce the number of instances in an AS group for expanding resources.</p> <p id="as_04_0103__p2367843414232">Manually change the expected number of instances to add or reduce the number of instances in an AS group for expanding resources.</p>

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<h1 class="topictitle1">Viewing a Scaling Action</h1> <h1 class="topictitle1">Viewing a Scaling Action</h1>
<div id="body25229732"><div class="section" id="as_04_0105__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_04_0105__p63605762320">This section describes how to check whether a scaling action has been performed and how to view scaling action details.</p> <div id="body25229732"><div class="section" id="as_04_0105__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_04_0105__p63605762320">This section describes how to check whether a scaling action has been performed and how to view scaling action details.</p>
</div> </div>
<div class="section" id="as_04_0105__section63885215174832"><h4 class="sectiontitle">Viewing Scaling Actions</h4><p id="as_04_0105__p37108621161544">The following steps illustrate how to view scaling actions of an AS group.</p> <div class="section" id="as_04_0105__section63885215174832"><h4 class="sectiontitle">Viewing Monitoring Data</h4><p id="as_04_0105__p37108621161544">The following steps illustrate how to view scaling actions of an AS group.</p>
</div> </div>
<ol id="as_04_0105__ol5351474516163"><li id="as_04_0105__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_04_0105__li1864023912336">Under <strong id="as_04_0105__b162493138291">Computing</strong>, click <strong id="as_04_0105__b026118139298">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_04_0105__b16261513112912">Instance Scaling</strong>.</li><li id="as_04_0105__li3972709916163">Click the <strong id="as_04_0105__b167815479449">AS Groups</strong> tab and then the name of the target AS group.</li><li id="as_04_0105__li2199957816163">Click the <strong id="as_04_0105__b9427632082009">Monitoring</strong> tab and view scaling actions. On the <strong id="as_04_0105__b577451310207">Monitoring</strong> page, you can view changes in the number of instances and metrics such as CPU Usage.</li></ol> <ol id="as_04_0105__ol5351474516163"><li id="as_04_0105__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_04_0105__li1864023912336">Under <strong id="as_04_0105__b162493138291">Computing</strong>, click <strong id="as_04_0105__b026118139298">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_04_0105__b16261513112912">Instance Scaling</strong>.</li><li id="as_04_0105__li3972709916163">Click the <strong id="as_04_0105__b167815479449">AS Groups</strong> tab and then the name of the target AS group.</li><li id="as_04_0105__li2199957816163">Click the <strong id="as_04_0105__b9427632082009">Monitoring</strong> tab and view scaling actions. On the <strong id="as_04_0105__b577451310207">Monitoring</strong> page, you can view changes in the number of instances and metrics such as CPU Usage.</li></ol>
<div class="section" id="as_04_0105__section16767161311122"><h4 class="sectiontitle">Viewing Historical Scaling Actions</h4><p id="as_04_0105__p66949174124">The following steps illustrate how to view the historical records of scaling actions of an AS group.</p> <div class="section" id="as_04_0105__section16767161311122"><h4 class="sectiontitle">Viewing Historical Scaling Actions</h4><p id="as_04_0105__p66949174124">The following steps illustrate how to view the historical records of scaling actions of an AS group.</p>
<ol id="as_04_0105__ol119451151101411"><li id="as_04_0105__li1194535151419">Under <strong id="as_04_0105__b41509165290">Computing</strong>, click <strong id="as_04_0105__b1515251611298">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_04_0105__b13153191692917">Instance Scaling</strong>.</li><li id="as_04_0105__li20457599157">Click the <strong id="as_04_0105__b18583344450">AS Groups</strong> tab and then the name of the target AS group.</li><li id="as_04_0105__li19548152091510">Click the <strong id="as_04_0105__b13885127152414">Scaling Actions</strong> tab. This page displays historical scaling actions of an AS group, including instance scaling and load balancer migration.<p id="as_04_0105__p1893595451820"><strong id="as_04_0105__b1776036314">Scaling Action ID</strong>, <strong id="as_04_0105__b1263466798">Status</strong>, <strong id="as_04_0105__b1553569047">Scaling Action Type</strong>, <strong id="as_04_0105__b574547044">Description</strong>, <strong id="as_04_0105__b345451704">Start Time</strong>, and <strong id="as_04_0105__b137276329">End Time</strong> of scaling actions are displayed. Click <span><img id="as_04_0105__image280454525" src="en-us_image_0164543452.jpg"></span> before the scaling action ID to view the resource name, status, and failure cause. You can also use the filtering function in the upper right corner to view scaling actions in a specified period.</p> <ol id="as_04_0105__ol119451151101411"><li id="as_04_0105__li1194535151419">Under <strong id="as_04_0105__b41509165290">Computing</strong>, click <strong id="as_04_0105__b1515251611298">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_04_0105__b13153191692917">Instance Scaling</strong>.</li><li id="as_04_0105__li20457599157">Click the <strong id="as_04_0105__b18583344450">AS Groups</strong> tab and then the name of the target AS group.</li><li id="as_04_0105__li19548152091510">Click the <strong id="as_04_0105__b13885127152414">Scaling Actions</strong> tab. This page displays historical scaling actions of an AS group, including instance scaling and load balancer migration.<p id="as_04_0105__p1893595451820"><strong id="as_04_0105__b2038149730">Scaling Action ID</strong>, <strong id="as_04_0105__b2106414372">Status</strong>, <strong id="as_04_0105__b1691102077">Scaling Action Type</strong>, <strong id="as_04_0105__b2098139679">Description</strong>, <strong id="as_04_0105__b979473263">Start Time</strong>, and <strong id="as_04_0105__b670703933">End Time</strong> of scaling actions are displayed. Click <span><img id="as_04_0105__image280454525" src="en-us_image_0164543452.jpg"></span> before the scaling action ID to view the resource name, status, and failure cause. You can also use the filtering function in the upper right corner to view scaling actions in a specified period.</p>
</li></ol> </li></ol>
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<h1 class="topictitle1">Configuring Instance Protection</h1> <h1 class="topictitle1">Configuring Instance Protection</h1>
<div id="body1505441299081"><div class="section" id="as_04_0107__section68401743312"><h4 class="sectiontitle">Scenarios</h4><p id="as_04_0107__p5597657210920">To control whether a particular instance can be removed automatically from an AS group, use instance protection. Once configured, when AS automatically scales in the AS group, the instance that is protected will not be removed.</p> <div id="body1505441299081"><div class="section" id="as_04_0107__section68401743312"><h4 class="sectiontitle">Scenarios</h4><p id="as_04_0107__p5597657210920">To control whether a instance can be removed automatically from an AS group, use instance protection. Once configured, when AS automatically scales in the AS group, the instance that is protected will not be removed.</p>
</div> </div>
<div class="section" id="as_04_0107__section33767911104059"><h4 class="sectiontitle">Prerequisites</h4><div class="p" id="as_04_0107__p24334635111917">Instance protection does not protect instances from the following:<ul id="as_04_0107__ul64867070111958"><li id="as_04_0107__li53144154111958">Health check replacement if the instance fails health checks</li><li id="as_04_0107__li7530062112010">Manual removal<div class="note" id="as_04_0107__note22815101111315"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="as_04_0107__ul1398872841611"><li id="as_04_0107__li94051919172615">Instance protection does not protect unhealthy instances because such instances cannot provide services.</li><li id="as_04_0107__li8988192810161">By default, instance protection does not take effect on the ECSs that are newly created in or added to an AS group.</li><li id="as_04_0107__li1198892816169">If an instance is removed from an AS group, its instance protection setting is lost.</li></ul> <div class="section" id="as_04_0107__section33767911104059"><h4 class="sectiontitle">Prerequisites</h4><div class="p" id="as_04_0107__p24334635111917">Instance protection does not protect instances from the following:<ul id="as_04_0107__ul64867070111958"><li id="as_04_0107__li53144154111958">Health check replacement if the instance fails health checks</li><li id="as_04_0107__li7530062112010">Manual removal<div class="note" id="as_04_0107__note22815101111315"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="as_04_0107__ul1398872841611"><li id="as_04_0107__li94051919172615">Instance protection does not protect unhealthy instances because such instances cannot provide services.</li><li id="as_04_0107__li8988192810161">By default, instance protection does not take effect on the ECSs that are newly created in or added to an AS group.</li><li id="as_04_0107__li1198892816169">If an instance is removed from an AS group, its instance protection setting is lost.</li></ul>
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<h1 class="topictitle1">Viewing Details About a Bandwidth Scaling Policy</h1> <h1 class="topictitle1">Viewing Details About a Bandwidth Scaling Policy</h1>
<div id="body1526441264746"><div class="section" id="as_05_0102__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_05_0102__p5166173584311">You can view details about a bandwidth scaling policy, including its basic information and execution logs. Policy execution logs record details about policy execution. This section describes how to create a bandwidth scaling policy.</p> <div id="body1526441264746"><div class="section" id="as_05_0102__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_05_0102__p5166173584311">You can view details about a bandwidth scaling policy, including its basic information and execution logs. Policy execution logs record details about policy execution.</p>
</div> </div>
<div class="section" id="as_05_0102__as_01_0103_section63621909102627"><h4 class="sectiontitle">Procedure</h4><ol id="as_05_0102__as_01_0103_ol62220677"><li id="as_05_0102__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_05_0102__lb6d7ef518d99439ab531f944d85bd857">Click <span><img id="as_05_0102__image14241195115244" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_05_0102__as_01_0103_li47357582">Under <strong id="as_05_0102__en-us_topic_0112331243_b13906349155020">Computing</strong>, click <strong id="as_05_0102__en-us_topic_0112331243_b292616493502">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_05_0102__en-us_topic_0112331243_b59261949175010">Bandwidth Scaling</strong>.</li><li id="as_05_0102__lbfbe2c96502a409caaeb352e1f0ee05a">On the <strong id="as_05_0102__b84003439480">Bandwidth Scaling</strong> page, click the name of a bandwidth scaling policy to go to the page showing its basic information and view its details. You can view basic information about the scaling policy, including <strong id="as_05_0102__b1411319178197">Policy Type</strong>, <strong id="as_05_0102__b294652616197">Trigger Condition</strong>, and <strong id="as_05_0102__b199151051201916">Scaling Action</strong>.</li></ol> <div class="section" id="as_05_0102__as_01_0103_section63621909102627"><h4 class="sectiontitle">Procedure</h4><ol id="as_05_0102__as_01_0103_ol62220677"><li id="as_05_0102__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_05_0102__lb6d7ef518d99439ab531f944d85bd857">Click <span><img id="as_05_0102__image14241195115244" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_05_0102__as_01_0103_li47357582">Under <strong id="as_05_0102__en-us_topic_0112331243_b13906349155020">Computing</strong>, click <strong id="as_05_0102__en-us_topic_0112331243_b292616493502">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_05_0102__en-us_topic_0112331243_b59261949175010">Bandwidth Scaling</strong>.</li><li id="as_05_0102__lbfbe2c96502a409caaeb352e1f0ee05a">On the <strong id="as_05_0102__b84003439480">Bandwidth Scaling</strong> page, click the name of a bandwidth scaling policy to go to the page showing its basic information and view its details. You can view basic information about the scaling policy, including <strong id="as_05_0102__b1411319178197">Policy Type</strong>, <strong id="as_05_0102__b294652616197">Trigger Condition</strong>, and <strong id="as_05_0102__b199151051201916">Scaling Action</strong>.</li></ol>
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<h1 class="topictitle1">Managing a Bandwidth Scaling Policy</h1> <h1 class="topictitle1">Managing a Bandwidth Scaling Policy</h1>
<div id="body1526441264746"><div class="section" id="as_05_0103__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_05_0103__p12289145174811">You can adjust the bandwidth through a bandwidth scaling policy.</p> <div id="body1526441264746"><div class="section" id="as_05_0103__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_05_0103__p12289145174811">You can adjust the bandwidth through a bandwidth scaling policy.</p>
<p id="as_05_0103__p5166173584311">This section describes how to manage bandwidth scaling policies, including enabling, disabling, modifying, deleting, and immediately executing a bandwidth scaling policy.</p> <p id="as_05_0103__p5166173584311">This section describes how to manage bandwidth scaling policies, including enabling, disabling, modifying, deleting, and immediately executing a bandwidth scaling policy.</p>
<div class="note" id="as_05_0103__note14938192715590"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="as_05_0103__p5136176526">The bandwidth scaling policy corresponding to a released EIP still occupies the policy quota. Only the account and its IAM users with the global permission can manage the AS bandwidth policy.</p> <div class="note" id="as_05_0103__note14938192715590"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="as_05_0103__p5136176526">The bandwidth scaling policy configured for a released EIP still occupies the policy quota. Only the account and its IAM users with the global permission can manage the bandwidth scaling policy.</p>
</div></div> </div></div>
</div> </div>
<div class="section" id="as_05_0103__as_01_0104_section47602278104932"><h4 class="sectiontitle">Enabling a Bandwidth Scaling Policy</h4><p id="as_05_0103__as_01_0104_p46963207145323">A bandwidth scaling policy can be enabled only when its status is <strong id="as_05_0103__b2163733192252">Disabled</strong>.</p> <div class="section" id="as_05_0103__as_01_0104_section47602278104932"><h4 class="sectiontitle">Enabling a Bandwidth Scaling Policy</h4><p id="as_05_0103__as_01_0104_p46963207145323">A bandwidth scaling policy can be enabled only when its status is <strong id="as_05_0103__b2163733192252">Disabled</strong>.</p>

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<h1 class="topictitle1">Health Check</h1> <h1 class="topictitle1">Health Check</h1>
<div id="body33449458"><p id="as_06_0101__p179471135164418">A health check removes abnormal instances from an AS group. Then, AS adds new instances to the AS group so that the number of instances is the same as the expected number. There are two types of AS group health check.</p> <div id="body33449458"><p id="as_06_0101__p179471135164418">A health check removes abnormal instances from an AS group. Then, AS adds new instances to the AS group so that the number of instances is the same as the expected number. There are two types of AS group health checks.</p>
<ul id="as_06_0101__ul50695543"><li id="as_06_0101__li6596890793234"><strong id="as_06_0101__b1260870592">ECS health check</strong>: checks ECS instance running status. If an instance is stopped or deleted, it is considered as abnormal. <strong id="as_06_0101__b190064118920556">ECS health check</strong> is the default health check mode for an AS group. The AS group periodically uses the check result to determine the running status of every instance in the AS group. If the health check results show that an instance is unhealthy, AS removes the instance from the AS group.</li><li id="as_06_0101__li1570960394927"><strong id="as_06_0101__b14131351251">ELB health check</strong>: determines ECS instance running status using a load balancing listener. If the AS group uses load balancers, the health check method can also be <strong id="as_06_0101__b71181815162220">ELB health check</strong>. If you add multiple load balancers to an AS group, an ECS instance is considered to be healthy only when all load balancers detect that the instance status is healthy. If any load balancer detects that an instance is unhealthy, the instance will be removed from the AS group.</li></ul> <ul id="as_06_0101__ul50695543"><li id="as_06_0101__li6596890793234"><strong id="as_06_0101__b210819083">ECS health check</strong>: checks ECS instance running status. If an instance is stopped or deleted, it is considered abnormal. <strong id="as_06_0101__b190064118920556">ECS health check</strong> is the default health check mode for an AS group. The AS group periodically uses the check result to determine the running status of every instance in the AS group. If the health check results show that an instance is unhealthy, AS removes the instance from the AS group.</li><li id="as_06_0101__li1570960394927"><strong id="as_06_0101__b14131351251">ELB health check</strong>: determines ECS instance running status using a load balancing listener. If the AS group uses load balancers, the health check method can also be <strong id="as_06_0101__b71181815162220">ELB health check</strong>. If you add multiple load balancers to an AS group, an ECS instance is considered to be healthy only when all load balancers detect that the instance status is healthy. If any load balancer detects that an instance is unhealthy, the instance will be removed from the AS group.</li></ul>
<p id="as_06_0101__p7609153313153">In both <strong id="as_06_0101__b2114632368205822">ECS health check</strong> and <strong id="as_06_0101__b354675325205836">ELB health check</strong> methods, AS removes unhealthy instances from AS groups. However, the removed instances are processed differently in the following two scenarios:</p> <p id="as_06_0101__p7609153313153">In both <strong id="as_06_0101__b2114632368205822">ECS health check</strong> and <strong id="as_06_0101__b354675325205836">ELB health check</strong> methods, AS removes unhealthy instances from AS groups. However, the removed instances are processed differently in the following two scenarios:</p>
<p id="as_06_0101__p7538102671518">For instances automatically added to an AS group during scaling actions, AS removes and deletes them. For instances manually added to an AS group, AS only removes them from the AS group.</p> <p id="as_06_0101__p7538102671518">For instances automatically added to an AS group during scaling actions, AS removes and deletes them. For instances manually added to an AS group, AS only removes them from the AS group.</p>
<p id="as_06_0101__p32694917155459">When an AS group is disabled, checking instance health status continues. However, AS will not remove instances.</p> <p id="as_06_0101__p32694917155459">When an AS group is disabled, checking instance health status continues. However, AS will not remove instances.</p>

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<p id="as_06_0103__p17638144035811">If you have enabled CTS, when a call is made to the AS API, the operation will be reported to CTS which will then deliver the operation record to a specified OBS bucket for storage. With CTS, you can record operations associated with AS for later query, audit, and backtrack operations.</p> <p id="as_06_0103__p17638144035811">If you have enabled CTS, when a call is made to the AS API, the operation will be reported to CTS which will then deliver the operation record to a specified OBS bucket for storage. With CTS, you can record operations associated with AS for later query, audit, and backtrack operations.</p>
</div> </div>
<div class="section" id="as_06_0103__section43859717155214"><h4 class="sectiontitle">Obtaining AS Information in CTS</h4><p id="as_06_0103__p60324991154939">After you enable CTS in the application system, the system logs the API calling operations performed on AS resources. On the <strong id="as_06_0103__b84235270615130">Cloud Trace Service</strong> console, you can view operation records for the last 7 days. To obtain more operation records, you can enable the Object Storage Service (OBS) and synchronize operation records to the OBS in real time.</p> <div class="section" id="as_06_0103__section43859717155214"><h4 class="sectiontitle">Obtaining AS Information in CTS</h4><p id="as_06_0103__p60324991154939">After you enable CTS in the application system, the system logs the API calling operations performed on AS resources. On the <strong id="as_06_0103__b84235270615130">Cloud Trace Service</strong> console, you can view operation records for the last 7 days. To obtain more operation records, you can enable the Object Storage Service (OBS) and synchronize operation records to the OBS in real time.</p>
<div class="p" id="as_06_0103__p6736852174116"><a href="#as_06_0103__table11766471458">Table 1</a> list the AS operations that can be recorded by CTS. <div class="p" id="as_06_0103__p6736852174116"><a href="#as_06_0103__table11766471458">Table 1</a> lists the AS operations that can be recorded by CTS.
<div class="tablenoborder"><a name="as_06_0103__table11766471458"></a><a name="table11766471458"></a><table cellpadding="4" cellspacing="0" summary="" id="as_06_0103__table11766471458" frame="border" border="1" rules="all"><caption><b>Table 1 </b>AS operations that can be recorded by CTS</caption><thead align="left"><tr id="as_06_0103__row17179104774518"><th align="left" class="cellrowborder" valign="top" width="20%" id="mcps1.3.2.3.2.2.4.1.1"><p id="as_06_0103__en-us_topic_0100240378_p56684903152351">Operation</p> <div class="tablenoborder"><a name="as_06_0103__table11766471458"></a><a name="table11766471458"></a><table cellpadding="4" cellspacing="0" summary="" id="as_06_0103__table11766471458" frame="border" border="1" rules="all"><caption><b>Table 1 </b>AS operations that can be recorded by CTS</caption><thead align="left"><tr id="as_06_0103__row17179104774518"><th align="left" class="cellrowborder" valign="top" width="20%" id="mcps1.3.2.3.2.2.4.1.1"><p id="as_06_0103__en-us_topic_0100240378_p56684903152351">Operation</p>
</th> </th>
<th align="left" class="cellrowborder" valign="top" width="32%" id="mcps1.3.2.3.2.2.4.1.2"><p id="as_06_0103__en-us_topic_0100240378_p28074446152351">Resource Type</p> <th align="left" class="cellrowborder" valign="top" width="32%" id="mcps1.3.2.3.2.2.4.1.2"><p id="as_06_0103__en-us_topic_0100240378_p28074446152351">Resource Type</p>
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</div> </div>
</div> </div>
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<div class="section" id="as_06_0103__section1953623116339"><h4 class="sectiontitle">Viewing Audit Logs</h4><ol id="as_06_0103__en-us_topic_0030598499_ol3001478295238"><li id="as_06_0103__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_06_0103__en-us_topic_0030598499_li34647912162648">Click <span><img id="as_06_0103__image14718102764410" src="en-us_image_0142360107.png"></span> in the upper left corner to select a region and a project.</li><li id="as_06_0103__en-us_topic_0030598499_li3694304795238">Click <strong id="as_06_0103__b842352706104116">Service List</strong>. Choose <strong id="as_06_0103__b2921183022715">Management &amp; Deployment</strong> &gt; <strong id="as_06_0103__b842352706183814">Cloud Trace Service</strong>.</li><li id="as_06_0103__en-us_topic_0030598499_li4560416895238">Click <strong id="as_06_0103__b42162954165740">Trace List</strong> in the navigation pane on the left.</li><li id="as_06_0103__en-us_topic_0030598499_li877858395238">You can use filters to query traces. The following filters are available:<ul class="subitemlist" id="as_06_0103__en-us_topic_0030598499_ul4173195016221"><li id="as_06_0103__en-us_topic_0030598499_li25120207165721"><strong id="as_06_0103__b84235270615318">Trace Source</strong>, <strong id="as_06_0103__b842352706153112">Resource Type</strong>, and <strong id="as_06_0103__b842352706153114">Search By</strong><p id="as_06_0103__en-us_topic_0030598499_p11447218171018">Select a filter criterion from the drop-down list.</p> <div class="section" id="as_06_0103__section1953623116339"><h4 class="sectiontitle">Viewing Audit Logs</h4><ol id="as_06_0103__en-us_topic_0030598499_ol3001478295238"><li id="as_06_0103__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="as_06_0103__en-us_topic_0030598499_li34647912162648">Click <span><img id="as_06_0103__image14718102764410" src="en-us_image_0142360107.png"></span> in the upper left corner to select a region and a project.</li><li id="as_06_0103__en-us_topic_0030598499_li3694304795238">Click <strong id="as_06_0103__b842352706104116">Service List</strong>. Choose <strong id="as_06_0103__b2921183022715">Management &amp; Deployment</strong> &gt; <strong id="as_06_0103__b842352706183814">Cloud Trace Service</strong>.</li><li id="as_06_0103__en-us_topic_0030598499_li4560416895238">Click <strong id="as_06_0103__b42162954165740">Trace List</strong> in the navigation pane on the left.</li><li id="as_06_0103__en-us_topic_0030598499_li877858395238">You can use filters to query traces. The following filters are available:<ul class="subitemlist" id="as_06_0103__en-us_topic_0030598499_ul4173195016221"><li id="as_06_0103__en-us_topic_0030598499_li25120207165721"><strong id="as_06_0103__b88681429142">Trace Type</strong>, <strong id="as_06_0103__b138693297414">Trace Source</strong>, <strong id="as_06_0103__b587072917413">Resource Type</strong>, and <strong id="as_06_0103__b1687062912417">Search By</strong>: Select a filter from the drop-down list.<p class="subitemlist" id="as_06_0103__p97391173920">If you select <strong id="as_06_0103__b14168171802617">Resource ID</strong> for <strong id="as_06_0103__b016961852615">Search By</strong>, specify a resource ID.</p>
<p id="as_06_0103__en-us_topic_0030598499_p1249980617649">When you select <strong id="as_06_0103__b842352706153249">Trace name</strong> for <strong id="as_06_0103__b1803301537153246">Search By</strong>, you need to select a specific trace name.</p> <p id="as_06_0103__p1026210519920">If you select <strong id="as_06_0103__b20260162552616">Data</strong> for <strong id="as_06_0103__b202602025112618">Trace Type</strong>, you can only filter traces by tracker.</p>
<p id="as_06_0103__en-us_topic_0030598499_p29348997171024">When you select <strong id="as_06_0103__b1369790384153349">Resource ID</strong> for <strong id="as_06_0103__b1590770393153349">Search By</strong>, you need to select or enter a specific resource ID.</p> </li><li id="as_06_0103__en-us_topic_0030598499_li16990144143538"><strong id="as_06_0103__b14623728173313">Operator</strong>: Select one or more specific operators from the drop-down list.</li><li id="as_06_0103__en-us_topic_0030598499_li2227630716221"><strong id="as_06_0103__b162414723316">Trace Status</strong>: Select <strong id="as_06_0103__b116258793315">All trace statuses</strong>, <strong id="as_06_0103__b10625167123311">Normal</strong>, <strong id="as_06_0103__b1762517163314">Warning</strong>, or <strong id="as_06_0103__b1662597113317">Incident</strong>.</li><li id="as_06_0103__en-us_topic_0030598499_li2484476616221">Time range: In the upper right corner, choose <strong id="as_06_0103__b10156172719411">Last 1 hour</strong>, <strong id="as_06_0103__b1773402994119">Last 1 day</strong>, or <strong id="as_06_0103__b1883233310415">Last 1 week</strong>, or specify a custom time range.</li></ul>
<p id="as_06_0103__en-us_topic_0030598499_p58234780171332">When you select <strong id="as_06_0103__b565110228153447">Resource name</strong> for <strong id="as_06_0103__b1329536783153447">Search By</strong>, you need to select or enter a specific resource name.</p> </li><li id="as_06_0103__en-us_topic_0030598499_li944262995238">Click <span><img id="as_06_0103__image182428913289" src="en-us_image_0108911462.jpg"></span> to the left of the required trace to expand its details.</li><li id="as_06_0103__en-us_topic_0030598499_li344192371514">Locate the required trace and click <strong id="as_06_0103__b842352706154059">View Trace</strong> in the <strong id="as_06_0103__b842352706142520">Operation</strong> column. The trace details are displayed.</li></ol>
</li><li id="as_06_0103__en-us_topic_0030598499_li16990144143538"><strong id="as_06_0103__b842352706153633">Operator</strong>: Select a specific operator (at user level rather than tenant level).</li><li id="as_06_0103__en-us_topic_0030598499_li2227630716221"><strong id="as_06_0103__b842352706153531">Trace Status</strong>: Available options include <strong id="as_06_0103__b1447794024144642">All trace statuses</strong>, <strong id="as_06_0103__b842352706153558">normal</strong>, <strong id="as_06_0103__b84235270615364">warning</strong>, and <strong id="as_06_0103__b842352706153613">incident</strong>. You can only select one of them.</li><li id="as_06_0103__en-us_topic_0030598499_li2484476616221">Time range: In the upper right corner of the page, you can query traces in the last one hour, last one day, last one week, or within a customized period of time.</li></ul>
</li><li id="as_06_0103__en-us_topic_0030598499_li944262995238">Click <span><img id="as_06_0103__image182428913289" src="en-us_image_0108911462.jpg"></span> to the left of the required trace to expand its details.</li><li id="as_06_0103__en-us_topic_0030598499_li344192371514">Locate the required trace and click <strong id="as_06_0103__b842352706154059">View Trace</strong> in the <strong id="as_06_0103__b842352706142520">Operation</strong> column. A dialog box is displayed, showing the trace content.</li></ol>
</div> </div>
<div class="section" id="as_06_0103__section54032088155336"><h4 class="sectiontitle">CTS Log Entries</h4><p id="as_06_0103__p952755010112">Each log entry consists of a trace in JSON format. A log entry indicates an AS API request, including the requested operation, the operation date and time, operation parameters, and information about the user who sends the request. The user information is obtained from the Identity and Access Management (IAM) service.</p> <div class="section" id="as_06_0103__section54032088155336"><h4 class="sectiontitle">CTS Log Entries</h4><p id="as_06_0103__p952755010112">Each log entry consists of a trace in JSON format. A log entry indicates an AS API request, including the requested operation, the operation date and time, operation parameters, and information about the user who sends the request. The user information is obtained from the Identity and Access Management (IAM) service.</p>
<div class="p" id="as_06_0103__p12973340154939">The following example shows CTS log entries for the <strong id="as_06_0103__b842352706172418">CreateScalingPolicy</strong> action:<pre class="screen" id="as_06_0103__screen66016507175144">{ <div class="p" id="as_06_0103__p12973340154939">The following example shows CTS log entries for the <strong id="as_06_0103__b842352706172418">CreateScalingPolicy</strong> action:<pre class="screen" id="as_06_0103__screen66016507175144">{

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<div id="body1500376665684"><div class="section" id="as_06_0104__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_06_0104__p1622395820217">If you have many resources of the same type, you can use a tag to manage resources flexibly. You can identify specified resources quickly using the tags allocated to them.</p> <div id="body1500376665684"><div class="section" id="as_06_0104__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_06_0104__p1622395820217">If you have many resources of the same type, you can use a tag to manage resources flexibly. You can identify specified resources quickly using the tags allocated to them.</p>
<p id="as_06_0104__p152183534">Using a tag, you can assign custom data to each AS group. You can organize and manage AS groups, for example, classify AS group resources by usage, owner, or environment.</p> <p id="as_06_0104__p152183534">Using a tag, you can assign custom data to each AS group. You can organize and manage AS groups, for example, classify AS group resources by usage, owner, or environment.</p>
<p id="as_06_0104__p16708589317">Each tag contains a key and a value. You can specify the key and value for each tag. A key can be a category associated with certain values, such as usage, owner, and environment.</p> <p id="as_06_0104__p16708589317">Each tag contains a key and a value. You can specify the key and value for each tag. A key can be a category associated with certain values, such as usage, owner, and environment.</p>
<p id="as_06_0104__p57613131331">For example, if you want to distinguish the test environment and production environment, you can allocate a tag with the key <strong id="as_06_0104__b84235270616226">environment</strong> to each AS group. For the test environment, the key value is <strong id="as_06_0104__b842352706162244">test</strong> and for the production environment, the key value is <strong id="as_06_0104__b84235270616239">production</strong>. You are advised to use one or more groups of consistent tags to manage your AS group resources.</p> <p id="as_06_0104__p57613131331">For example, if you want to distinguish between the test environment and production environment, you can allocate a tag with the key <strong id="as_06_0104__b84235270616226">environment</strong> to each AS group. For the test environment, the key value is <strong id="as_06_0104__b842352706162244">test</strong> and for the production environment, the key value is <strong id="as_06_0104__b84235270616239">production</strong>. You are advised to use one or more groups of consistent tags to manage your AS group resources.</p>
<p id="as_06_0104__p12289145174811">After you allocate a tag to an AS group, the system will automatically add the tag to the instances automatically created in the AS group. If you add a tag to an AS group or modify the tag, the new tag will be added to the ECSs automatically created in the AS group. Creating, deleting, or modifying the tag of an AS group will have no impact on the ECSs in the AS group.</p> <p id="as_06_0104__p12289145174811">After you allocate a tag to an AS group, the system will automatically add the tag to the instances automatically created in the AS group. If you add a tag to an AS group or modify the tag, the new tag will be added to the ECSs automatically created in the AS group. Creating, deleting, or modifying the tag of an AS group will have no impact on the ECSs in the AS group.</p>
</div> </div>
<div class="section" id="as_06_0104__section7355112104225"><h4 class="sectiontitle">Restrictions of Using Tags</h4><div class="p" id="as_06_0104__p11616132104242">You must observe the following rules when using tags:<ul id="as_06_0104__ul37436328104242"><li id="as_06_0104__li1382640104242">Each AS group can have a maximum of 10 tags added to it.</li><li id="as_06_0104__li29817215105124">Each tag contains a key and a value.</li><li id="as_06_0104__li11807385104242">You can set the tag value to an empty character string.</li><li id="as_06_0104__li16874151104242">If you delete an AS group, all tags of it will also be deleted.</li></ul> <div class="section" id="as_06_0104__section7355112104225"><h4 class="sectiontitle">Restrictions of Using Tags</h4><div class="p" id="as_06_0104__p11616132104242">You must observe the following rules when using tags:<ul id="as_06_0104__ul37436328104242"><li id="as_06_0104__li1382640104242">Each AS group can have a maximum of 10 tags added to it.</li><li id="as_06_0104__li29817215105124">Each tag contains a key and a value.</li><li id="as_06_0104__li11807385104242">You can set the tag value to an empty character string.</li><li id="as_06_0104__li16874151104242">If you delete an AS group, all tags of it will also be deleted.</li></ul>
@ -21,14 +21,14 @@
</thead> </thead>
<tbody><tr id="as_06_0104__row5695691323119"><td class="cellrowborder" valign="top" width="18.54%" headers="mcps1.3.3.2.5.2.2.4.1.1 "><p id="as_06_0104__p5010724023119">Tag Key</p> <tbody><tr id="as_06_0104__row5695691323119"><td class="cellrowborder" valign="top" width="18.54%" headers="mcps1.3.3.2.5.2.2.4.1.1 "><p id="as_06_0104__p5010724023119">Tag Key</p>
</td> </td>
<td class="cellrowborder" valign="top" width="53.39%" headers="mcps1.3.3.2.5.2.2.4.1.2 "><ul id="as_06_0104__ul2321196023222"><li id="as_06_0104__li400332623222">The value cannot be empty.</li><li id="as_06_0104__li56235771151321">An AS group has a unique key.</li></ul> <td class="cellrowborder" valign="top" width="53.39%" headers="mcps1.3.3.2.5.2.2.4.1.2 "><ul id="as_06_0104__ul2321196023222"><li id="as_06_0104__li400332623222">The value cannot be empty.</li><li id="as_06_0104__li56235771151321">An AS group has a unique key.</li><li id="as_06_0104__li173982819418">A key can contain a maximum of 36 characters, including only digits, letters, hyphens (-), and underscores (_).</li></ul>
</td> </td>
<td class="cellrowborder" valign="top" width="28.07%" headers="mcps1.3.3.2.5.2.2.4.1.3 "><p id="as_06_0104__p5438834323119">Organization</p> <td class="cellrowborder" valign="top" width="28.07%" headers="mcps1.3.3.2.5.2.2.4.1.3 "><p id="as_06_0104__p5438834323119">Organization</p>
</td> </td>
</tr> </tr>
<tr id="as_06_0104__row1973304523119"><td class="cellrowborder" valign="top" width="18.54%" headers="mcps1.3.3.2.5.2.2.4.1.1 "><p id="as_06_0104__p5487280123119">Tag Value</p> <tr id="as_06_0104__row1973304523119"><td class="cellrowborder" valign="top" width="18.54%" headers="mcps1.3.3.2.5.2.2.4.1.1 "><p id="as_06_0104__p5487280123119">Tag Value</p>
</td> </td>
<td class="cellrowborder" valign="top" width="53.39%" headers="mcps1.3.3.2.5.2.2.4.1.2 "><ul id="as_06_0104__ul6706750105539"><li id="as_06_0104__li64806765101310">The value can be an empty character string.</li><li id="as_06_0104__li26634116105411">A key can have only one value.</li></ul> <td class="cellrowborder" valign="top" width="53.39%" headers="mcps1.3.3.2.5.2.2.4.1.2 "><ul id="as_06_0104__ul6706750105539"><li id="as_06_0104__li64806765101310">The value can be an empty character string.</li><li id="as_06_0104__li26634116105411">A key can have only one value.</li><li id="as_06_0104__li1177715241344">A tag value can contain a maximum of 43 characters, including only digits, letters, hyphens (-), and underscores (_).</li></ul>
</td> </td>
<td class="cellrowborder" valign="top" width="28.07%" headers="mcps1.3.3.2.5.2.2.4.1.3 "><p id="as_06_0104__p4850087723119">Apache</p> <td class="cellrowborder" valign="top" width="28.07%" headers="mcps1.3.3.2.5.2.2.4.1.3 "><p id="as_06_0104__p4850087723119">Apache</p>
</td> </td>
@ -39,7 +39,7 @@
</li><li id="as_06_0104__li39846552175450">Click <strong id="as_06_0104__b1570856957172655">OK</strong>.</li></ol> </li><li id="as_06_0104__li39846552175450">Click <strong id="as_06_0104__b1570856957172655">OK</strong>.</li></ol>
</div> </div>
<div class="section" id="as_06_0104__section8057725103917"><h4 class="sectiontitle">Modifying or Deleting Tags of an AS Group</h4><ol id="as_06_0104__ol62220677"><li id="as_06_0104__li9869732999">Log in to the management console.</li></ol> <div class="section" id="as_06_0104__section8057725103917"><h4 class="sectiontitle">Modifying or Deleting Tags of an AS Group</h4><ol id="as_06_0104__ol62220677"><li id="as_06_0104__li9869732999">Log in to the management console.</li></ol>
<ol id="as_06_0104__ol2830085105211"><li id="as_06_0104__li53599395154535">Click <span><img id="as_06_0104__image18815121619297" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_06_0104__li10136163984010">Under <strong id="as_06_0104__b11908359202214">Computing</strong>, click <strong id="as_06_0104__b9910259142216">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_06_0104__b16910155919224">Instance Scaling</strong>. Then click the <strong id="as_06_0104__b5911155932218">AS Groups</strong> tab.</li><li id="as_06_0104__li49866103105211">Click the AS group name. On the <strong id="as_06_0104__b84235270623139">Overview</strong> page, click the <strong id="as_06_0104__b680475908">Tags</strong> tab.</li><li id="as_06_0104__li2425833410547">Locate the row that contains the tag and click <strong id="as_06_0104__b84235270617366">Edit</strong> or <strong id="as_06_0104__b84235270617369">Delete</strong> in the <strong id="as_06_0104__b842352706173621">Operation</strong> column.<p id="as_06_0104__p1677314711125">After clicking <strong id="as_06_0104__b324261571173649">Edit</strong>, configure required parameters. For details, see <a href="#as_06_0104__table1794599823119">Table 1</a>.</p> <ol id="as_06_0104__ol2830085105211"><li id="as_06_0104__li53599395154535">Click <span><img id="as_06_0104__image18815121619297" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="as_06_0104__li10136163984010">Under <strong id="as_06_0104__b11908359202214">Computing</strong>, click <strong id="as_06_0104__b9910259142216">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="as_06_0104__b16910155919224">Instance Scaling</strong>. Then click the <strong id="as_06_0104__b5911155932218">AS Groups</strong> tab.</li><li id="as_06_0104__li49866103105211">Click the AS group name. On the <strong id="as_06_0104__b84235270623139">Overview</strong> page, click the <strong id="as_06_0104__b858851897">Tags</strong> tab.</li><li id="as_06_0104__li2425833410547">Locate the row that contains the tag and click <strong id="as_06_0104__b84235270617366">Edit</strong> or <strong id="as_06_0104__b84235270617369">Delete</strong> in the <strong id="as_06_0104__b842352706173621">Operation</strong> column.<p id="as_06_0104__p1677314711125">After clicking <strong id="as_06_0104__b324261571173649">Edit</strong>, configure required parameters. For details, see <a href="#as_06_0104__table1794599823119">Table 1</a>.</p>
<p id="as_06_0104__p5990166611137">After you click <strong id="as_06_0104__b260932618173735">Delete</strong>, the added tag will be deleted.</p> <p id="as_06_0104__p5990166611137">After you click <strong id="as_06_0104__b260932618173735">Delete</strong>, the added tag will be deleted.</p>
</li></ol> </li></ol>
</div> </div>

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<a name="as_07_0100"></a><a name="as_07_0100"></a>
<h1 class="topictitle1">Permissions Management</h1>
<div id="body1558577462557"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="as_07_0102.html">Creating a User and Granting AS Permissions</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="as_07_0103.html">AS Custom Policies</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0042283271.html">AS Management</a></div>
</div>
</div>

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<a name="as_07_0102"></a><a name="as_07_0102"></a>
<h1 class="topictitle1">Creating a User and Granting AS Permissions</h1>
<div id="body1558577463365"><div class="section" id="as_07_0102__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_07_0102__p19341341165"><a href="https://docs.otc.t-systems.com/identity-access-management/umn/service_overview/what_is_iam.html" target="_blank" rel="noopener noreferrer">IAM</a> can help you implement fine-grained permissions control over your AS resources. With IAM, you can</p>
<ul id="as_07_0102__ul17995143562"><li id="as_07_0102__li46646558613">Create IAM users for employees based on your enterprise's organizational structure. Each IAM user will have their own security credentials for accessing AS resources.</li><li id="as_07_0102__li174131154713">Grant only the permissions required for users to perform a specific task.</li><li id="as_07_0102__li115110918717">Use <a href="https://docs.otc.t-systems.com/identity-access-management/umn/service_overview/what_is_iam.html" target="_blank" rel="noopener noreferrer">IAM</a> to entrust an account or cloud service to perform efficient O&amp;M on your AS resources.</li></ul>
<p id="as_07_0102__p87391417299">If your account does not require individual IAM users, skip this section.</p>
<p id="as_07_0102__p78941506910">This section describes the procedure for granting permissions (see <a href="#as_07_0102__fig1515164216142">Figure 1</a>).</p>
</div>
<div class="section" id="as_07_0102__section6126111243014"><h4 class="sectiontitle">Prerequisites</h4><p id="as_07_0102__p1626720301296">Learn about the permissions (see <a href="as_pro_0007.html">Permissions Management</a>) supported by AS and choose policies or roles according to your requirements. For the permissions of other services, see <a href="https://docs.otc.t-systems.com/additional/permissions.html" target="_blank" rel="noopener noreferrer">Permission Description</a>.</p>
</div>
<div class="section" id="as_07_0102__section203711514125317"><h4 class="sectiontitle">Process Flow</h4><div class="fignone" id="as_07_0102__fig1515164216142"><a name="as_07_0102__fig1515164216142"></a><a name="fig1515164216142"></a><span class="figcap"><b>Figure 1 </b>Process for granting AS permissions</span><br><span><img id="as_07_0102__image3885631155319" src="en-us_image_0171188722.jpg"></span></div>
<ol id="as_07_0102__ol102751734125416"><li id="as_07_0102__li10176121316284"><a name="as_07_0102__li10176121316284"></a><a name="li10176121316284"></a><a href="https://docs.otc.t-systems.com/identity-access-management/umn/getting_started/creating_a_user_group_and_assigning_permissions.html#iam-01-0030" target="_blank" rel="noopener noreferrer">Create a user group and assign permissions to it</a>.<p id="as_07_0102__p532014413567">Create a user group on the IAM console, and attach the <strong id="as_07_0102__b176945495157">AutoScaling ReadOnlyAccess</strong> policy to the group.</p>
</li><li id="as_07_0102__li122751534175417"><a href="https://docs.otc.t-systems.com/identity-access-management/umn/user_guide/user_and_user_group_management/creating_a_user.html#en-us-topic-0046611303" target="_blank" rel="noopener noreferrer">Create an IAM user and add it to the user group</a>.<p id="as_07_0102__p12757347540">Create a user on the IAM console and add the user to the group created in <a href="#as_07_0102__li10176121316284">1</a>.</p>
</li><li id="as_07_0102__li227543410541"><a href="https://docs.otc.t-systems.com/identity-access-management/umn/getting_started/logging_in_as_a_user.html#iam-01-0032" target="_blank" rel="noopener noreferrer">Log in</a> and verify permissions.<p id="as_07_0102__p14448838131712">Log in to the AS console as the created user, and verify the user's permissions for AS.</p>
<ul id="as_07_0102__ul0221541101419"><li id="as_07_0102__li1522741121412">Choose <strong id="as_07_0102__b4914941151811">Service List</strong> &gt; <strong id="as_07_0102__b844344514181">Auto Scaling</strong>. Then, click <strong id="as_07_0102__b259414492014">Create AS Group</strong> on the AS console. If a message appears indicating that you have insufficient permissions to perform the operation, the <strong id="as_07_0102__b122612222115">AutoScaling ReadOnlyAccess</strong> policy has already taken effect.</li><li id="as_07_0102__li12221641131415">Choose any other service in the <strong id="as_07_0102__b973264172114">Service List</strong>. If a message appears indicating that you have insufficient permissions to access the service, the <strong id="as_07_0102__b196051555182117">AutoScaling ReadOnlyAccess</strong> policy has already taken effect.</li></ul>
</li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="as_07_0100.html">Permissions Management</a></div>
</div>
</div>

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<a name="as_07_0103"></a><a name="as_07_0103"></a>
<h1 class="topictitle1">AS Custom Policies</h1>
<div id="body1558577464133"><div class="section" id="as_07_0103__section2495449014355"><h4 class="sectiontitle">Scenarios</h4><p id="as_07_0103__p1233132491116">Custom policies can be created to supplement the system-defined policies of AS. For the actions that can be added to custom policies, see "Permissions Policies and Supported Actions" in <em id="as_07_0103__i12365859714">Auto Scaling API Reference</em>.</p>
<p id="as_07_0103__p1664233111110">You can create custom policies in either of the following ways:</p>
<ul id="as_07_0103__ul14528173414116"><li id="as_07_0103__li18384478119">Visual editor: Select cloud services, actions, resources, and request conditions. This does not require knowledge of policy syntax.</li><li id="as_07_0103__li1752810342115">JSON: Edit JSON policies from scratch or based on an existing policy.</li></ul>
<p id="as_07_0103__p13798613134019">For operation details, see <a href="https://docs.otc.t-systems.com/identity-access-management/umn/user_guide/fine-grained_policy_management/creating_a_custom_policy.html#iam-01-0016" target="_blank" rel="noopener noreferrer">Creating a Custom Policy</a>. The following section contains examples of common AS custom policies.</p>
</div>
<div class="section" id="as_07_0103__section938914481384"><h4 class="sectiontitle">Example Custom Policies</h4><ul id="as_07_0103__ul3541174820819"><li id="as_07_0103__li954174811818">Example 1: Allowing users to remove instances from an AS group and create AS configurations<pre class="screen" id="as_07_0103__screen1984581351618">{
"Version": "1.1",
"Statement": [
{
"Effect": "Allow",
"Action": [
"as:instances:delete",
"as:configs:create"
]
}
]
}</pre>
</li><li id="as_07_0103__li054154812819">Example 2: Denying AS group deletion<p id="as_07_0103__p9541164816811"><a name="as_07_0103__li054154812819"></a><a name="li054154812819"></a>A policy with only "Deny" permissions must be used in conjunction with other policies to take effect. If the permissions assigned to a user contain both "Allow" and "Deny", the "Deny" permissions take precedence over the "Allow" permissions.</p>
<p id="as_07_0103__p54631559214">The following method can be used if you need to assign permissions of the <strong id="as_07_0103__b8118103811">AutoScaling FullAccess</strong> policy to a user but you want to prevent the user from deleting AS groups. Create a custom policy for denying AS group deletion, and attach both policies to the group to which the user belongs. Then, the user can perform all operations on AS except deleting AS groups. The following is an example of a deny policy:</p>
<pre class="screen" id="as_07_0103__screen15930122720235">{
"Version": "1.1",
"Statement": [
{
"Action": [
"as:groups:delete"
],
"Effect": "Deny"
}
]
}</pre>
</li></ul>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="as_07_0100.html">Permissions Management</a></div>
</div>
</div>

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@ -31,7 +31,7 @@ fi
result=`fdisk -l $disk | grep $disk` result=`fdisk -l $disk | grep $disk`
if [ $result = 1 ] if [ $result = 1 ]
then then
echo "disk path is not exist in linux,exit" echo "disk path does not exist in linux,exit"
exit exit
fi fi

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<a name="as_faq_0011"></a><a name="as_faq_0011"></a> <a name="as_faq_0011"></a><a name="as_faq_0011"></a>
<h1 class="topictitle1">How Can I Automatically Deploy My Application on an Instance?</h1> <h1 class="topictitle1">How Can I Automatically Deploy My Application on an Instance?</h1>
<div id="body10296046"><p id="as_faq_0011__p12994144817479">To enable automatic application deployment on instances automatically added to an AS group, create a private image with the application preinstalled and automatic startup settings preconfigured. Create an AS configuration with the private image, and the change the AS configuration used by the AS group to the one you created. Your application will be automatically deployed on instances that are automatically added to the AS group. The procedure is as follows:</p> <div id="body10296046"><p id="as_faq_0011__p12994144817479">To enable automatic application deployment on instances automatically added to an AS group, create a private image with the application preinstalled and automatic startup settings preconfigured. Create an AS configuration with the private image, and then change the AS configuration used by the AS group to the one you created. Your application will be automatically deployed on instances that are automatically added to the AS group. The procedure is as follows:</p>
<ol id="as_faq_0011__ol34166919"><li id="as_faq_0011__li34306193155039">Install the application on the instance you will use to create a private image, and configure the application to automatically start at boot.</li><li id="as_faq_0011__li735592116215"><a name="as_faq_0011__li735592116215"></a><a name="li735592116215"></a>Create a private image using the instance. For details, see <em id="as_faq_0011__i785261183116"></em><em id="as_faq_0011__i138529119312">Image Management Service User Guide</em><em id="as_faq_0011__i4852311123112"></em><em id="as_faq_0011__i78521211143110"></em><em id="as_faq_0011__i16852101143114"></em>.</li><li id="as_faq_0011__li6411253193514"><a name="as_faq_0011__li6411253193514"></a><a name="li6411253193514"></a>Create an AS configuration using the private image. For details, see <em id="as_faq_0011__i26111443125613"></em><a href="as_02_0103.html">Creating an AS Configuration from a New Specifications Template</a>. Ensure that the image in the AS configuration is the private image created in <a href="#as_faq_0011__li735592116215">2</a>.</li><li id="as_faq_0011__li28673382">Go to the page that shows the details about your AS group.</li><li id="as_faq_0011__li8316190164412">Click <strong id="as_faq_0011__b1284015561444">Change Configuration</strong> to the right of <strong id="as_faq_0011__b13484157054">Configuration Name</strong>. In the displayed dialog box, select the AS configuration created in <a href="#as_faq_0011__li6411253193514">3</a> and click <strong id="as_faq_0011__b6908192911514">OK</strong>.<p id="as_faq_0011__p7961105511473">After new instances are added to the AS group in the next scaling action, you can check whether your application has been installed on the instances. If you encounter any problems, contact technical support.</p> <ol id="as_faq_0011__ol34166919"><li id="as_faq_0011__li34306193155039">Install the application on the instance you will use to create a private image, and configure the application to automatically start at boot.</li><li id="as_faq_0011__li735592116215"><a name="as_faq_0011__li735592116215"></a><a name="li735592116215"></a>Create a private image using the instance. For details, see <em id="as_faq_0011__i785261183116"></em><em id="as_faq_0011__i138529119312">Image Management Service User Guide</em><em id="as_faq_0011__i4852311123112"></em><em id="as_faq_0011__i78521211143110"></em><em id="as_faq_0011__i16852101143114"></em>.</li><li id="as_faq_0011__li6411253193514"><a name="as_faq_0011__li6411253193514"></a><a name="li6411253193514"></a>Create an AS configuration. For details, <a href="as_02_0103.html">Creating an AS Configuration from a New Specifications Template</a>. During the creation, select the private image created in <a href="#as_faq_0011__li735592116215">2</a>.</li><li id="as_faq_0011__li28673382">Go to the page that shows the details about your AS group.</li><li id="as_faq_0011__li8316190164412">Click <strong id="as_faq_0011__b1284015561444">Change Configuration</strong> to the right of <strong id="as_faq_0011__b13484157054">Configuration Name</strong>. In the displayed dialog box, select the AS configuration created in <a href="#as_faq_0011__li6411253193514">3</a> and click <strong id="as_faq_0011__b6908192911514">OK</strong>.<p id="as_faq_0011__p7961105511473">After new instances are added to the AS group in the next scaling action, you can check whether your application has been installed on the instances. If you encounter any problems, contact technical support.</p>
</li></ol> </li></ol>
</div> </div>
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</div> </div>
<div class="section" id="as_faq_0012__section59804173"><h4 class="sectiontitle">Handling Method</h4><ol id="as_faq_0012__ol46683439"><li id="as_faq_0012__li17497770">Check whether the ECS needs to be logged in to.<ul class="subitemlist" id="as_faq_0012__ul23262209"><li id="as_faq_0012__li8033291">If yes, use the original image password or key pair to log in to this ECS.<p id="as_faq_0012__p5190763"><a name="as_faq_0012__li8033291"></a><a name="li8033291"></a>The original image password or key pair is the OS password or key pair configured when the private image was created.</p> <div class="section" id="as_faq_0012__section59804173"><h4 class="sectiontitle">Handling Method</h4><ol id="as_faq_0012__ol46683439"><li id="as_faq_0012__li17497770">Check whether the ECS needs to be logged in to.<ul class="subitemlist" id="as_faq_0012__ul23262209"><li id="as_faq_0012__li8033291">If yes, use the original image password or key pair to log in to this ECS.<p id="as_faq_0012__p5190763"><a name="as_faq_0012__li8033291"></a><a name="li8033291"></a>The original image password or key pair is the OS password or key pair configured when the private image was created.</p>
</li><li id="as_faq_0012__li46716873">If no, go to step <a href="#as_faq_0012__li4126846117151">2</a>.</li></ul> </li><li id="as_faq_0012__li46716873">If no, go to step <a href="#as_faq_0012__li4126846117151">2</a>.</li></ul>
</li><li id="as_faq_0012__li4126846117151"><a name="as_faq_0012__li4126846117151"></a><a name="li4126846117151"></a>Change the AS configuration for the AS group. For details, see <a href="as_01_0103.html">Changing the AS Configuration for an AS Group</a>.</li></ol> </li><li id="as_faq_0012__li4126846117151"><a name="as_faq_0012__li4126846117151"></a><a name="li4126846117151"></a>Change the AS configuration of the AS group. For details, see <a href="as_01_0103.html">Changing the AS Configuration for an AS Group</a>.</li></ol>
<div class="note" id="as_faq_0012__note3276954817212"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="as_faq_0012__p2649047717212">Make sure that Cloud-Init or Cloudbase-Init has been installed on the image specified in the new AS configuration. For how to install Cloud-Init or Cloudbase-Init, see <em id="as_faq_0012__i141627494">Image Management Service User Guide</em>.</p> <div class="note" id="as_faq_0012__note3276954817212"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="as_faq_0012__p2649047717212">Make sure that Cloud-Init or Cloudbase-Init has been installed on the image specified in the new AS configuration. For how to install Cloud-Init or Cloudbase-Init, see <em id="as_faq_0012__i141627494">Image Management Service User Guide</em>.</p>
</div></div> </div></div>
<p class="litext" id="as_faq_0012__p20304554">After the AS configuration is changed, you can use the key file to log in to the new ECSs that are added to the AS group during scaling actions. You do not need to use the original image password or key pair to log in to these new ECSs anymore.</p> <p class="litext" id="as_faq_0012__p20304554">After the AS configuration is changed, you can use the key file to log in to the new ECSs that are added to the AS group during scaling actions. You do not need to use the original image password or key pair to log in to these new ECSs anymore.</p>

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<a name="as_faq_0033"></a><a name="as_faq_0033"></a> <a name="as_faq_0033"></a><a name="as_faq_0033"></a>
<h1 class="topictitle1">How Do I Fix the Error "The key pair does not exist" When I Connect to an Instance?</h1> <h1 class="topictitle1">How Do I Fix the Error "The key pair does not exist" When I Connect to an Instance?</h1>
<div id="body1574752233983"><p id="as_faq_0033__p2013453211118">A key pair is specific to each user. If the key pair of a user who is under the same account as you is configured for an AS configuration, you cannot connect the instances scaled out using that AS configuration.</p> <div id="body1574752233983"><p id="as_faq_0033__p2013453211118">A key pair is specific to each user. If the key pair of a user who belongs to the same account as you is configured for an AS configuration, you cannot connect the instances scaled out using that AS configuration.</p>
<p id="as_faq_0033__p913493261116">If you want to connect to these instances without being restricted by the key pair permission, password authentication needs to be configured as the login mode.</p> <p id="as_faq_0033__p913493261116">If you want to connect to these instances without being restricted by the key pair permission, password authentication needs to be configured as the login mode.</p>
</div> </div>
<div> <div>

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<p id="as_faq_1904__p1529891163419">Based on the scaling rules, the manually added instances are not created based on the AS configuration used by the AS group. The instances automatically added using the AS configuration are removed at first. The manually added instances would not be removed until all of the automatically added instances have been removed first. Finally, since you have set the minimum number of instances to N or a larger value, those instances cannot be removed.</p> <p id="as_faq_1904__p1529891163419">Based on the scaling rules, the manually added instances are not created based on the AS configuration used by the AS group. The instances automatically added using the AS configuration are removed at first. The manually added instances would not be removed until all of the automatically added instances have been removed first. Finally, since you have set the minimum number of instances to N or a larger value, those instances cannot be removed.</p>
<p id="as_faq_1904__p19298151173417">Note: If the instances manually added are stopped or if they malfunction, they are marked as unhealthy and removed from the AS group. This is because health checks ensure that all instances in the AS group are healthy.</p> <p id="as_faq_1904__p19298151173417">Note: If the instances manually added are stopped or if they malfunction, they are marked as unhealthy and removed from the AS group. This is because health checks ensure that all instances in the AS group are healthy.</p>
</div> </div>
<div class="section" id="as_faq_1904__section11231148173413"><h4 class="sectiontitle">Method 2</h4><p id="as_faq_1904__p1164235453416">Enable instance protection for the N instances. For more information, see <a href="as_04_0107.html">Configuring Instance Protection</a>.</p> <div class="section" id="as_faq_1904__section11231148173413"><h4 class="sectiontitle">Method 2</h4><p id="as_faq_1904__p1164235453416">Enable instance protection for these instances. For details, see <a href="as_04_0107.html">Configuring Instance Protection</a>.</p>
<p id="as_faq_1904__p135918454377">You can enable instance protection for these instances at the same time. When the AS group scales in, protected instances will not be removed from the AS group as long as they do not fail health checks. Instances that fail health check will be removed even if they are protected.</p> <p id="as_faq_1904__p135918454377">You can enable instance protection for these instances at the same time. When the AS group scales in, protected instances will not be removed from the AS group as long as they do not fail health checks. Instances that fail health check will be removed even if they are protected.</p>
</div> </div>
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<a name="as_pro_0001"></a><a name="as_pro_0001"></a> <a name="as_pro_0001"></a><a name="as_pro_0001"></a>
<h1 class="topictitle1">AS Advantages</h1> <h1 class="topictitle1">AS Advantages</h1>
<div id="body8662426"><p id="as_pro_0001__en-us_topic_0190953966_p12825123512517">AS automatically scales resources to keep up with service demands based on pre-configured AS policies. With automatic resource scaling, you can enjoy reduced costs, improved availability, and high fault tolerance. AS is used for following scenarios:</p> <div id="body8662426"><p id="as_pro_0001__en-us_topic_0190953966_p12825123512517">AS automatically scales resources to keep up with service demands based on pre-configured AS policies. With automatic resource scaling, you can enjoy reduced costs, improved availability, and high fault tolerance. AS is used for the following scenarios:</p>
<ul id="as_pro_0001__en-us_topic_0190953966_ul164355911327"><li id="as_pro_0001__en-us_topic_0190953966_li106456311312">Heavy-traffic forums: The traffic on a popular forum is difficult to predict. AS dynamically adjusts the number of ECS instances based on monitored ECS metrics, such as vCPU and memory usage.</li><li id="as_pro_0001__en-us_topic_0190953966_li96673313313">E-commerce: During big promotions, E-commerce websites need more resources. AS automatically increases ECS instances and bandwidths within minutes to ensure that promotions go smoothly.</li><li id="as_pro_0001__en-us_topic_0190953966_li76431859173216">Live streaming: A live streaming website may broadcast popular programs from 14:00 to 16:00 every day. AS automatically scales out ECS and bandwidth resources during this period to ensure a smooth viewer experience.</li></ul> <ul id="as_pro_0001__en-us_topic_0190953966_ul164355911327"><li id="as_pro_0001__en-us_topic_0190953966_li106456311312">Heavy-traffic forums: The traffic on a popular forum is difficult to predict. AS dynamically adjusts the number of ECS instances based on monitored ECS metrics, such as vCPU and memory usage.</li><li id="as_pro_0001__en-us_topic_0190953966_li96673313313">E-commerce: During big promotions, e-commerce websites need more resources. AS automatically increases ECS instances and bandwidths within minutes to ensure that promotions go smoothly.</li><li id="as_pro_0001__en-us_topic_0190953966_li76431859173216">Live streaming: A livestreaming website may broadcast popular programs from 14:00 to 16:00 every day. AS automatically scales out ECS and bandwidth resources during this period to ensure a smooth viewer experience.</li></ul>
<div class="section" id="as_pro_0001__en-us_topic_0190953966_section7577425172014"><h4 class="sectiontitle">Automatic Resource Scaling</h4><p id="as_pro_0001__en-us_topic_0190953966_p7128170174117">AS adds ECS instances and increases bandwidths for your applications when the access volume increases and removes unneeded resources when the access volume drops, ensuring system stability and availability.</p> <div class="section" id="as_pro_0001__en-us_topic_0190953966_section7577425172014"><h4 class="sectiontitle">Automatic Resource Scaling</h4><p id="as_pro_0001__en-us_topic_0190953966_p7128170174117">AS adds ECS instances and increases bandwidths for your applications when the access volume increases and removes unneeded resources when the access volume drops, ensuring system stability and availability.</p>
<ul id="as_pro_0001__en-us_topic_0190953966_ul133272265332"><li id="as_pro_0001__en-us_topic_0190953966_li13327152610336">Scaling ECS Instances on Demand<p id="as_pro_0001__en-us_topic_0190953966_p14833340164746"><a name="as_pro_0001__en-us_topic_0190953966_li13327152610336"></a><a name="en-us_topic_0190953966_li13327152610336"></a>AS scales ECS instances for applications based on demand, improving cost management. ECS instances can be scaled dynamically, on a schedule, or manually:</p> <ul id="as_pro_0001__en-us_topic_0190953966_ul133272265332"><li id="as_pro_0001__en-us_topic_0190953966_li13327152610336">Scaling ECS Instances on Demand<p id="as_pro_0001__en-us_topic_0190953966_p14833340164746"><a name="as_pro_0001__en-us_topic_0190953966_li13327152610336"></a><a name="en-us_topic_0190953966_li13327152610336"></a>AS scales ECS instances for applications based on demand, improving cost management. ECS instances can be scaled dynamically, on a schedule, or manually:</p>
<ul id="as_pro_0001__en-us_topic_0190953966_ul2010375617942"><li id="as_pro_0001__en-us_topic_0190953966_li3508631117957">Dynamic scaling<p id="as_pro_0001__en-us_topic_0190953966_p41031078171844"><a name="as_pro_0001__en-us_topic_0190953966_li3508631117957"></a><a name="en-us_topic_0190953966_li3508631117957"></a>Dynamic scaling allows scale resources in response to changing demand using alarm-based policies. For details, see <a href="as_04_0101.html">Dynamic Scaling</a>.</p> <ul id="as_pro_0001__en-us_topic_0190953966_ul2010375617942"><li id="as_pro_0001__en-us_topic_0190953966_li3508631117957">Dynamic scaling<p id="as_pro_0001__en-us_topic_0190953966_p41031078171844"><a name="as_pro_0001__en-us_topic_0190953966_li3508631117957"></a><a name="en-us_topic_0190953966_li3508631117957"></a>Dynamic scaling allows scale resources in response to changing demand using alarm-based policies. For details, see <a href="as_04_0101.html">Dynamic Scaling</a>.</p>
</li><li id="as_pro_0001__en-us_topic_0190953966_li59464646171846">Scheduled scaling<p id="as_pro_0001__en-us_topic_0190953966_p55358857171948"><a name="as_pro_0001__en-us_topic_0190953966_li59464646171846"></a><a name="en-us_topic_0190953966_li59464646171846"></a>Scheduled scaling helps you to set up your own scaling schedule according to predictable load changes by creating periodic or scheduled policies. For details, see <a href="as_04_0102.html">Scheduled Scaling</a>.</p> </li><li id="as_pro_0001__en-us_topic_0190953966_li59464646171846">Scheduled scaling<p id="as_pro_0001__en-us_topic_0190953966_p55358857171948"><a name="as_pro_0001__en-us_topic_0190953966_li59464646171846"></a><a name="en-us_topic_0190953966_li59464646171846"></a>Scheduled scaling helps you set up your scaling schedule according to predictable load changes by creating periodic or scheduled policies. For details, see <a href="as_04_0102.html">Scheduled Scaling</a>.</p>
</li><li id="as_pro_0001__en-us_topic_0190953966_li42843217951">Manual scaling<p id="as_pro_0001__en-us_topic_0190953966_p13931358173255"><a name="as_pro_0001__en-us_topic_0190953966_li42843217951"></a><a name="en-us_topic_0190953966_li42843217951"></a>You can either manually change the expected number of instances of your AS group, or add or remove instances to or from the AS group. For details, see <a href="as_04_0103.html">Manual Scaling</a>.</p> </li><li id="as_pro_0001__en-us_topic_0190953966_li42843217951">Manual scaling<p id="as_pro_0001__en-us_topic_0190953966_p13931358173255"><a name="as_pro_0001__en-us_topic_0190953966_li42843217951"></a><a name="en-us_topic_0190953966_li42843217951"></a>You can either manually change the expected number of instances of your AS group, or add or remove instances to or from the AS group. For details, see <a href="as_04_0103.html">Manual Scaling</a>.</p>
</li></ul> </li></ul>
<p id="as_pro_0001__en-us_topic_0190953966_p2878643133617">Consider a train ticket booking application running on the public cloud. The load of the application may be relatively low during Q2 and Q3 because there are not many travelers, but relatively high during Q1 and Q4. Traditionally, there are two ways to plan for these changes in load. The first option is to provision enough servers so that the application always has enough capacity to meet demand, as shown in <a href="#as_pro_0001__en-us_topic_0190953966_fig5650831994251">Figure 1</a>. The second option is to provision servers according to the average load of the application, as shown in <a href="#as_pro_0001__en-us_topic_0190953966_fig2116647195317">Figure 2</a>. However, these two options may waste resources or be unable to meet demand during peak seasons. By enabling AS for this application, you have a third option available. AS helps you scale servers to keep up with changes in demand. This allows the application to maintain steady, predictable performance without wasting money on any unnecessary resources, as shown in <a href="#as_pro_0001__en-us_topic_0190953966_fig2219215695354">Figure 3</a>.</p> <p id="as_pro_0001__en-us_topic_0190953966_p2878643133617">Consider a train ticket booking application running on the public cloud. The load of the application may be relatively low during Q2 and Q3 because there are not many travelers, but relatively high during Q1 and Q4. Traditionally, there are two ways to plan for these changes in load. The first option is to provide enough servers so that the application always has enough capacity to meet demand, as shown in <a href="#as_pro_0001__en-us_topic_0190953966_fig5650831994251">Figure 1</a>. The second option is to provision servers according to the average load of the application, as shown in <a href="#as_pro_0001__en-us_topic_0190953966_fig2116647195317">Figure 2</a>. However, these two options may waste resources or be unable to meet demand during peak seasons. By enabling AS for this application, you have a third option available. AS helps you scale servers to keep up with changes in demand. This allows the application to maintain steady, predictable performance without wasting money on any unnecessary resources, as shown in <a href="#as_pro_0001__en-us_topic_0190953966_fig2219215695354">Figure 3</a>.</p>
<div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig5650831994251"><a name="as_pro_0001__en-us_topic_0190953966_fig5650831994251"></a><a name="en-us_topic_0190953966_fig5650831994251"></a><span class="figcap"><b>Figure 1 </b>Over-provisioned capacity</span><br><span><img id="as_pro_0001__en-us_topic_0190953966_image1822761491124" src="en-us_image_0192950213.png"></span></div> <div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig5650831994251"><a name="as_pro_0001__en-us_topic_0190953966_fig5650831994251"></a><a name="en-us_topic_0190953966_fig5650831994251"></a><span class="figcap"><b>Figure 1 </b>Over-provisioned capacity</span><br><span><img id="as_pro_0001__en-us_topic_0190953966_image1822761491124" src="en-us_image_0192950213.png"></span></div>
<div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig2116647195317"><a name="as_pro_0001__en-us_topic_0190953966_fig2116647195317"></a><a name="en-us_topic_0190953966_fig2116647195317"></a><span class="figcap"><b>Figure 2 </b>Insufficient capacity</span><br><span><img id="as_pro_0001__en-us_topic_0190953966_image1551413091147" src="en-us_image_0192950214.png"></span></div> <div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig2116647195317"><a name="as_pro_0001__en-us_topic_0190953966_fig2116647195317"></a><a name="en-us_topic_0190953966_fig2116647195317"></a><span class="figcap"><b>Figure 2 </b>Insufficient capacity</span><br><span><img id="as_pro_0001__en-us_topic_0190953966_image1551413091147" src="en-us_image_0192950214.png"></span></div>
<div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig2219215695354"><a name="as_pro_0001__en-us_topic_0190953966_fig2219215695354"></a><a name="en-us_topic_0190953966_fig2219215695354"></a><span class="figcap"><b>Figure 3 </b>Auto-scaled capacity</span><br><span><img id="as_pro_0001__en-us_topic_0190953966_image1513529610659" src="en-us_image_0192950215.png"></span></div> <div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig2219215695354"><a name="as_pro_0001__en-us_topic_0190953966_fig2219215695354"></a><a name="en-us_topic_0190953966_fig2219215695354"></a><span class="figcap"><b>Figure 3 </b>Auto-scaled capacity</span><br><span><img id="as_pro_0001__en-us_topic_0190953966_image1513529610659" src="en-us_image_0192950215.png"></span></div>
@ -19,18 +19,18 @@
</li><li id="as_pro_0001__en-us_topic_0190953966_li64347505258">Scheduled policies<p id="as_pro_0001__en-us_topic_0190953966_p13213813360"><a name="as_pro_0001__en-us_topic_0190953966_li64347505258"></a><a name="en-us_topic_0190953966_li64347505258"></a>The system automatically increases, decreases, or adjusts the bandwidth to a fixed value on a fixed schedule.</p> </li><li id="as_pro_0001__en-us_topic_0190953966_li64347505258">Scheduled policies<p id="as_pro_0001__en-us_topic_0190953966_p13213813360"><a name="as_pro_0001__en-us_topic_0190953966_li64347505258"></a><a name="en-us_topic_0190953966_li64347505258"></a>The system automatically increases, decreases, or adjusts the bandwidth to a fixed value on a fixed schedule.</p>
</li><li id="as_pro_0001__en-us_topic_0190953966_li204341450102514">Periodic policies<p id="as_pro_0001__en-us_topic_0190953966_p91731059133515"><a name="as_pro_0001__en-us_topic_0190953966_li204341450102514"></a><a name="en-us_topic_0190953966_li204341450102514"></a>The system periodically adjusts the bandwidth based on a configured periodic cycle.</p> </li><li id="as_pro_0001__en-us_topic_0190953966_li204341450102514">Periodic policies<p id="as_pro_0001__en-us_topic_0190953966_p91731059133515"><a name="as_pro_0001__en-us_topic_0190953966_li204341450102514"></a><a name="en-us_topic_0190953966_li204341450102514"></a>The system periodically adjusts the bandwidth based on a configured periodic cycle.</p>
</li></ul> </li></ul>
<p id="as_pro_0001__en-us_topic_0190953966_p3792125913536">For example, you can use an alarm-based policy to regulate the bandwidth for a live streaming website.</p> <p id="as_pro_0001__en-us_topic_0190953966_p3792125913536">For example, you can use an alarm-based policy to regulate the bandwidth for a livestreaming website.</p>
<p id="as_pro_0001__en-us_topic_0190953966_p478010234192">For a live streaming website, service load is difficult to predict. In this example, the bandwidth needs to be dynamically adjusted between 10 Mbit/s and 30 Mbit/s based on metrics such as outbound traffic and inbound traffic. AS can automatically adjust the bandwidth to meet requirements. You just need to select the relevant EIP and create two alarm policies. One policy is to increase the bandwidth by 2 Mbit/s when the outbound traffic is greater than <em id="as_pro_0001__i1464217221127">X</em> bytes, with the limit set to 30 Mbit/s. The other policy is to decrease the bandwidth by 2 Mbit/s when the outbound traffic is less than <em id="as_pro_0001__i129661372214">X</em> bytes, with the limit set to 10 Mbit/s.</p> <p id="as_pro_0001__en-us_topic_0190953966_p478010234192">For a livestreaming website, service load is difficult to predict. In this example, the bandwidth needs to be dynamically adjusted between 10 Mbit/s and 30 Mbit/s based on metrics such as outbound traffic and inbound traffic. AS can automatically adjust the bandwidth to meet requirements. You just need to select the relevant EIP and create two alarm policies. One policy is to increase the bandwidth by 2 Mbit/s when the outbound traffic is greater than <em id="as_pro_0001__i1464217221127">X</em> bytes, with the limit set to 30 Mbit/s. The other policy is to decrease the bandwidth by 2 Mbit/s when the outbound traffic is less than <em id="as_pro_0001__i129661372214">X</em> bytes, with the limit set to 10 Mbit/s.</p>
</li><li id="as_pro_0001__en-us_topic_0190953966_li164372819459">Evenly Distributing Instances by AZ<p id="as_pro_0001__en-us_topic_0190953966_p17181217135911"><a name="as_pro_0001__en-us_topic_0190953966_li164372819459"></a><a name="en-us_topic_0190953966_li164372819459"></a>To reduce the impact of power or network outage on system stability, AS attempts to distribute ECS instances evenly across the AZs that are used by an AS group.</p> </li><li id="as_pro_0001__en-us_topic_0190953966_li164372819459">Evenly Distributing Instances by AZ<p id="as_pro_0001__en-us_topic_0190953966_p17181217135911"><a name="as_pro_0001__en-us_topic_0190953966_li164372819459"></a><a name="en-us_topic_0190953966_li164372819459"></a>To reduce the impact of power or network outage on system stability, AS attempts to distribute ECS instances evenly across the AZs that are used by an AS group.</p>
<p id="as_pro_0001__en-us_topic_0190953966_p381733720321">A region is a geographic area where resources used by ECS instances are located. Each region contains multiple Availability Zones (AZs) where resources use independent power supplies and networks. AZs are physically isolated from one another but interconnected through an intranet. AZs are engineered to be isolated from failures in other AZs. They provide cost-effective, low-latency network connections to other AZs in the same region.</p> <p id="as_pro_0001__en-us_topic_0190953966_p381733720321">A region is a geographic area where resources used by ECS instances are located. Each region contains multiple AZs where resources use independent power supplies and networks. AZs are physically isolated from one another but interconnected through an intranet. AZs are engineered to be isolated from failures in other AZs. They provide cost-effective, low-latency network connections to other AZs in the same region.</p>
<p id="as_pro_0001__en-us_topic_0190953966_p7284614">An AS group can contain ECS instances in one or more AZs within a region. During scale the capacity of an AS group, AS attempts to evenly distribute ECS instances across AZs used by the AS group based on the following rules:</p> <p id="as_pro_0001__en-us_topic_0190953966_p7284614">An AS group can contain ECS instances in one or more AZs within a region. When scaling the capacity of an AS group, AS attempts to evenly distribute ECS instances across AZs used by the AS group based on the following rules:</p>
<p id="as_pro_0001__en-us_topic_0190953966_p65561530"><strong id="as_pro_0001__b842352706154220">Evenly distributing new instances to balanced AZs</strong></p> <p id="as_pro_0001__en-us_topic_0190953966_p65561530"><strong id="as_pro_0001__b842352706154220">Evenly distributing new instances to balanced AZs</strong></p>
<p id="as_pro_0001__en-us_topic_0190953966_p53182860">AS attempts to evenly distribute ECS instances across the AZs used by an AS group. To do it, AS adds new instances to the AZ with the fewest instances.</p> <p id="as_pro_0001__en-us_topic_0190953966_p53182860">AS attempts to evenly distribute ECS instances across the AZs used by an AS group. To do it, AS adds new instances to the AZ with the fewest instances.</p>
<p id="as_pro_0001__en-us_topic_0190953966_p1659714116575">Consider an AS group containing four instances that are evenly distributed in the two AZs used by the AS group. If a scaling action is triggered to add four more instances to the AS group, AS adds two to each AZ.</p> <p id="as_pro_0001__en-us_topic_0190953966_p1659714116575">Consider an AS group containing four instances that are evenly distributed in the two AZs used by the AS group. If a scaling action is triggered to add four more instances to the AS group, AS adds two to each AZ.</p>
<div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig2228386112644"><span class="figcap"><b>Figure 4 </b>Evenly distributing instances</span><br><span><img id="as_pro_0001__image202271587155" src="en-us_image_0200324625.png"></span></div> <div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig2228386112644"><span class="figcap"><b>Figure 4 </b>Evenly distributing instances</span><br><span><img id="as_pro_0001__image202271587155" src="en-us_image_0200324625.png"></span></div>
<p id="as_pro_0001__en-us_topic_0190953966_p128137104520"></p> <p id="as_pro_0001__en-us_topic_0190953966_p128137104520"></p>
<p id="as_pro_0001__en-us_topic_0190953966_p8883693"><strong id="as_pro_0001__b84235270615429">Re-balancing instances across AZs</strong></p> <p id="as_pro_0001__en-us_topic_0190953966_p8883693"><strong id="as_pro_0001__b84235270615429">Re-balancing instances across AZs</strong></p>
<p id="as_pro_0001__en-us_topic_0190953966_p12844374">After you have manually added or removed instances to or from an AS group, the AS group can become unbalanced between AZs. AS compensates by re-balancing the AZs during the next scaling action.</p> <p id="as_pro_0001__p1479613351407">After you have manually added or removed instances to or from an AS group, the AS group can become unbalanced between AZs. AS compensates by re-balancing the AZs during the next scaling action.</p>
<p id="as_pro_0001__en-us_topic_0190953966_p21729217456">Consider an AS group containing three instances that are distributed in AZ 1 and AZ 2, with two in AZ 1 and one in AZ 2. If a scaling action is triggered to add five more instances to the AS group, AS adds two to AZ 1 and three to AZ 2.</p> <p id="as_pro_0001__en-us_topic_0190953966_p21729217456">Consider an AS group containing three instances that are distributed in AZ 1 and AZ 2, with two in AZ 1 and one in AZ 2. If a scaling action is triggered to add five more instances to the AS group, AS adds two to AZ 1 and three to AZ 2.</p>
<div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig21279150112736"><span class="figcap"><b>Figure 5 </b>Re-balancing instances</span><br><span><img id="as_pro_0001__image12535135519134" src="en-us_image_0200324482.png"></span></div> <div class="fignone" id="as_pro_0001__en-us_topic_0190953966_fig21279150112736"><span class="figcap"><b>Figure 5 </b>Re-balancing instances</span><br><span><img id="as_pro_0001__image12535135519134" src="en-us_image_0200324482.png"></span></div>
</li></ul> </li></ul>

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<div id="body8662426"><p id="as_pro_0003__en-us_topic_0190954113_p23783925164659">AS has the following constraints:</p> <div id="body8662426"><p id="as_pro_0003__en-us_topic_0190954113_p23783925164659">AS has the following constraints:</p>
<ul id="as_pro_0003__en-us_topic_0190954113_ul4951999591632"><li id="as_pro_0003__en-us_topic_0190954113_li1269314914368">Only applications that are stateless and can be horizontally scaled can run on instances in an AS group.<div class="note" id="as_pro_0003__note3800730426"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="as_pro_0003__ul1985811519611"><li id="as_pro_0003__li695213151613">A stateless process or application can be understood in isolation. There is no stored knowledge of or reference to past transactions. Each transaction is made as if from scratch for the first time.<p id="as_pro_0003__p1816717381365"><a name="as_pro_0003__li695213151613"></a><a name="li695213151613"></a>ECS instances where stateless applications are running do not store data that needs to be persisted locally.</p> <ul id="as_pro_0003__en-us_topic_0190954113_ul4951999591632"><li id="as_pro_0003__en-us_topic_0190954113_li1269314914368">Only applications that are stateless and can be horizontally scaled can run on instances in an AS group.<div class="note" id="as_pro_0003__note3800730426"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="as_pro_0003__ul1985811519611"><li id="as_pro_0003__li695213151613">A stateless process or application can be understood in isolation. There is no stored knowledge of or reference to past transactions. Each transaction is made as if from scratch for the first time.<p id="as_pro_0003__p1816717381365"><a name="as_pro_0003__li695213151613"></a><a name="li695213151613"></a>ECS instances where stateless applications are running do not store data that needs to be persisted locally.</p>
<p id="as_pro_0003__p166494248610">Think of stateless transactions as a vending machine: a single request and a response.</p> <p id="as_pro_0003__p166494248610">Think of stateless transactions as a vending machine: a single request and a response.</p>
</li><li id="as_pro_0003__li15975415575">Stateful applications and processes, however, are those that can be returned to again and again. They are performed with the context of previous transactions and the current transaction may be affected by what happened during previous transactions.<p id="as_pro_0003__p113969301176"><a name="as_pro_0003__li15975415575"></a><a name="li15975415575"></a>ECS instances where stateful applications are running store data that needs to be persisted locally.</p> </li><li id="as_pro_0003__li15975415575">Stateful applications and processes, however, are those that can be returned to again and again. They are performed in the context of previous transactions and the current transaction may be affected by what happened during previous transactions.<p id="as_pro_0003__p113969301176"><a name="as_pro_0003__li15975415575"></a><a name="li15975415575"></a>ECS instances where stateful applications are running store data that needs to be persisted locally.</p>
<p id="as_pro_0003__p195718174710">Stateful transactions are performed repeatedly, such as online banking or e-mail, which are performed with the context of previous transactions.</p> <p id="as_pro_0003__p195718174710">Stateful transactions are performed repeatedly, such as online banking or e-mail, which are performed in the context of previous transactions.</p>
</li></ul> </li></ul>
</div></div> </div></div>
</li><li id="as_pro_0003__en-us_topic_0190954113_li1104533191632">AS can release ECS instances in an AS group automatically, so the instances cannot be used to save application status information (such as session statuses) or related data (such as database data and logs). If the application status or related data must be saved, you can store the information on separate servers.</li><li id="as_pro_0003__en-us_topic_0190954113_li1748401112366">AS does not support capacity expansion or deduction of instance vCPUs and memory.</li><li id="as_pro_0003__en-us_topic_0190954113_li44454137194329">AS requires authentication provided by Identity and Access Management (IAM).<p id="as_pro_0003__en-us_topic_0190954113_p34297633194334"><a name="as_pro_0003__en-us_topic_0190954113_li44454137194329"></a><a name="en-us_topic_0190954113_li44454137194329"></a>AutoScaling Administrator requires permissions of Tenant Guest, Server Administrator, CES Administrator, and ELB Administrator.</p> </li><li id="as_pro_0003__en-us_topic_0190954113_li1104533191632">AS can release ECS instances in an AS group automatically, so the instances cannot be used to save application status information (such as session statuses) or related data (such as database data and logs). If the application status or related data must be saved, you can store the information on separate servers.</li><li id="as_pro_0003__en-us_topic_0190954113_li1748401112366">AS does not support capacity expansion or deduction of instance vCPUs and memory.</li><li id="as_pro_0003__en-us_topic_0190954113_li44454137194329">AS requires authentication provided by Identity and Access Management (IAM).<p id="as_pro_0003__en-us_topic_0190954113_p34297633194334"><a name="as_pro_0003__en-us_topic_0190954113_li44454137194329"></a><a name="en-us_topic_0190954113_li44454137194329"></a>AutoScaling Administrator requires permissions of Tenant Guest, Server Administrator, CES Administrator, and ELB Administrator.</p>

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<tr id="as_qs_0005__row19614145145315"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p1261415516531">AZ</p> <tr id="as_qs_0005__row19614145145315"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p1261415516531">AZ</p>
</td> </td>
<td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p10805969403">An AZ is a physical location where resources use independent power supply and networks. AZs are physically isolated but interconnected through an internal network.</p> <td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p10805969403">An AZ is a physical location where resources use independent power supply and networks. AZs are physically isolated but interconnected through an internal network.</p>
<ul id="as_qs_0005__ul1861141261019"><li id="as_qs_0005__li7611712141012">If you require high availability, buy servers in difference AZs.</li><li id="as_qs_0005__li106171214105">If you require low network latency, buy servers in the same AZ.</li></ul> <ul id="as_qs_0005__ul1861141261019"><li id="as_qs_0005__li7611712141012">If you require high availability, buy servers in different AZs.</li><li id="as_qs_0005__li106171214105">If you require low network latency, buy servers in the same AZ.</li></ul>
<p id="as_qs_0005__p116651349185417">To enhance application availability, the system evenly distributes your instances between AZs if multiple AZs have been selected.</p> <p id="as_qs_0005__p116651349185417">To enhance application availability, the system evenly distributes your instances between AZs if multiple AZs have been selected.</p>
</td> </td>
<td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="as_qs_0005__p961495112536">N/A</p> <td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="as_qs_0005__p961495112536">N/A</p>
@ -42,7 +42,7 @@
</td> </td>
<td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p50664859">Specifies the maximum number of ECS instances in an AS group.</p> <td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p50664859">Specifies the maximum number of ECS instances in an AS group.</p>
</td> </td>
<td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="as_qs_0005__p10212927">0</p> <td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="as_qs_0005__p10212927">1</p>
</td> </td>
</tr> </tr>
<tr id="as_qs_0005__row24807479"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p63248778">Expected Instances</p> <tr id="as_qs_0005__row24807479"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p63248778">Expected Instances</p>
@ -57,7 +57,7 @@
</td> </td>
<td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p498555851216">Specifies the minimum number of ECS instances in an AS group.</p> <td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p498555851216">Specifies the minimum number of ECS instances in an AS group.</p>
</td> </td>
<td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="as_qs_0005__p14986758151210">1</p> <td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="as_qs_0005__p14986758151210">0</p>
</td> </td>
</tr> </tr>
<tr id="as_qs_0005__row16313497"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p46324881">VPC</p> <tr id="as_qs_0005__row16313497"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p46324881">VPC</p>
@ -77,13 +77,13 @@
</tr> </tr>
<tr id="as_qs_0005__row6128980"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p102720515599">Load Balancing</p> <tr id="as_qs_0005__row6128980"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p102720515599">Load Balancing</p>
</td> </td>
<td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p1609475215599">This parameter is optional. A load balancer automatically distributes traffic across all instances in an AS group to balance their service load. It improves fault tolerance of your applications and expands application service capabilities.</p> <td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p1609475215599">This parameter is optional. A load balancer automatically distributes traffic across all instances in an AS group to balance their service load. It improves the fault tolerance of your applications and expands application service capabilities.</p>
<div class="note" id="as_qs_0005__note1063504415599"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="as_qs_0005__ul1817818563313"><li class="textintable" id="as_qs_0005__li01781856339">Up to three load balancers can be added to an AS group.</li><li class="textintable" id="as_qs_0005__li81782568312">After multiple load balancers are added to an AS group, multiple services can be concurrently listened to, thereby improving scalability. If <strong id="as_qs_0005__b1781123361216">ELB health check</strong> is selected for <strong id="as_qs_0005__b2781233161216">Health Check Method</strong>, when any one of the listeners detects that an instance becomes unhealthy, AS will replace the faulty instance with a functional one.</li></ul> <div class="note" id="as_qs_0005__note1063504415599"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="as_qs_0005__ul1817818563313"><li class="textintable" id="as_qs_0005__li01781856339">Up to three load balancers can be added to an AS group.</li><li class="textintable" id="as_qs_0005__li81782568312">After multiple load balancers are added to an AS group, multiple services can be concurrently listened to, thereby improving scalability. If <strong id="as_qs_0005__b1781123361216">ELB health check</strong> is selected for <strong id="as_qs_0005__b2781233161216">Health Check Method</strong>, when any one of the listeners detects that an instance becomes unhealthy, AS will replace the faulty instance with a functional one.</li></ul>
</div></div> </div></div>
<p id="as_qs_0005__p3542840015599">If you select <strong id="as_qs_0005__b1069545173117">Classic </strong><strong id="as_qs_0005__b157574523117">load balancer</strong>, configure the following parameters:</p> <p id="as_qs_0005__p3542840015599">If you select <strong id="as_qs_0005__b1069545173117">Classic </strong><strong id="as_qs_0005__b157574523117">load balancer</strong>, configure the following parameters:</p>
<ul id="as_qs_0005__ul4982997994510"><li id="as_qs_0005__li4581663094510"><strong id="as_qs_0005__b8423527061090">Load Balancer</strong></li><li id="as_qs_0005__li969649394510"><strong id="as_qs_0005__b8423527061093">Listener</strong></li></ul> <ul id="as_qs_0005__ul4982997994510"><li id="as_qs_0005__li4581663094510"><strong id="as_qs_0005__b8423527061090">Load Balancer</strong></li><li id="as_qs_0005__li969649394510"><strong id="as_qs_0005__b8423527061093">Listener</strong></li></ul>
<div class="p" id="as_qs_0005__p23417149454">If you select <strong id="as_qs_0005__b10687551124510">Enhanced load balancer</strong>, configure the following parameters:<ul id="as_qs_0005__ul1865661654415"><li id="as_qs_0005__li11656161654414"><strong id="as_qs_0005__b264575475">Load Balancer</strong></li><li id="as_qs_0005__li1365616163449"><strong id="as_qs_0005__b842352706194411">Backend ECS Group</strong></li></ul> <div class="p" id="as_qs_0005__p23417149454">If you select <strong id="as_qs_0005__b10687551124510">Enhanced load balancer</strong>, configure the following parameters:<ul id="as_qs_0005__ul1865661654415"><li id="as_qs_0005__li11656161654414"><strong id="as_qs_0005__b1825083780">Load Balancer</strong></li><li id="as_qs_0005__li1365616163449"><strong id="as_qs_0005__b842352706194411">Backend ECS Group</strong></li></ul>
<ul id="as_qs_0005__ul16565169449"><li id="as_qs_0005__li196566161441"><strong id="as_qs_0005__b84235270610935">Backend Port</strong>: specifies the port on which a backend ECS listens for traffic.</li><li id="as_qs_0005__li665691610444"><strong id="as_qs_0005__b842352706101430">Weight</strong>: determines the portion of requests a backend ECS processes compared to other backend ECSs added to the same listener.<p id="as_qs_0005__p5656316104419">For more information about load balancing, see <em id="as_qs_0005__i84235269719113">Elastic Load Balancing User Guide</em><em id="as_qs_0005__i189657412275"></em><em id="as_qs_0005__i8599108122716"></em><em id="as_qs_0005__i1168175911011"></em>.</p> <ul id="as_qs_0005__ul16565169449"><li id="as_qs_0005__li196566161441"><strong id="as_qs_0005__b84235270610935">Backend Port</strong>: specifies the port on which a backend ECS listens for traffic.</li><li id="as_qs_0005__li665691610444"><strong id="as_qs_0005__b842352706101430">Weight</strong>: determines the portion of requests a backend ECS processes compared to other backend ECSs added to the same listener.<p id="as_qs_0005__p5656316104419">For more information about load balancing, see <em id="as_qs_0005__i84235269719113">Elastic Load Balancing User Guide</em><em id="as_qs_0005__i189657412275"></em><em id="as_qs_0005__i8599108122716"></em><em id="as_qs_0005__i1168175911011"></em><em id="as_qs_0005__i49105412617"></em><em id="as_qs_0005__i157051417152815"></em>.</p>
</li></ul> </li></ul>
</div> </div>
</td> </td>
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<tr id="as_qs_0005__row32922880"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p49507636">Health Check Method</p> <tr id="as_qs_0005__row32922880"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="as_qs_0005__p49507636">Health Check Method</p>
</td> </td>
<td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p2129537693230">When a health check detects a faulty ECS, AS removes the faulty ECS from the AS group and adds a new one. The health check is implemented using any of the following methods:</p> <td class="cellrowborder" valign="top" width="60%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="as_qs_0005__p2129537693230">When a health check detects a faulty ECS, AS removes the faulty ECS from the AS group and adds a new one. The health check is implemented using any of the following methods:</p>
<ul id="as_qs_0005__ul50695543"><li id="as_qs_0005__li6596890793234"><strong id="as_qs_0005__b8423527069724">ECS health check</strong>: checks ECS instance running status. If an instance is stopped or deleted, it is considered as unhealthy. This method is selected by default. Using this method, the AS group periodically determines the running status of each ECS instance based on the health check result. If the health check results show that an instance is unhealthy, AS removes the instance from the AS group.</li><li id="as_qs_0005__li574159859439"><strong id="as_qs_0005__b162239179229">ELB health check</strong>: determines ECS running status using a load balancing listener. This health check method is available only when the AS group uses a load balancing listener. When a load balancing listener detects that an ECS is faulty, AS removes the ECS from the AS group.</li></ul> <ul id="as_qs_0005__ul50695543"><li id="as_qs_0005__li6596890793234"><strong id="as_qs_0005__b8423527069724">ECS health check</strong>: checks ECS instance running status. If an instance is stopped or deleted, it is considered unhealthy. This method is selected by default. Using this method, the AS group periodically determines the running status of each ECS instance based on the health check result. If the health check results show that an instance is unhealthy, AS removes the instance from the AS group.</li><li id="as_qs_0005__li574159859439"><strong id="as_qs_0005__b162239179229">ELB health check</strong>: determines ECS running status using a load balancing listener. This health check method is available only when the AS group uses a load balancing listener. When a load balancing listener detects that an ECS is faulty, AS removes the ECS from the AS group.</li></ul>
</td> </td>
<td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="as_qs_0005__p31815862">N/A</p> <td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="as_qs_0005__p31815862">N/A</p>
</td> </td>
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</table> </table>
</div> </div>
<p id="as_qs_0005__p17246610243"></p> <p id="as_qs_0005__p17246610243"></p>
</li><li id="as_qs_0005__li61747774">Click <strong id="as_qs_0005__b1107671610279">Next</strong>.</li><li id="as_qs_0005__li18859061">On the displayed page, you can use an existing AS configuration or create an AS configuration. For details, see <a href="as_02_0102.html">Creating an AS Configuration from an Existing ECS Instance</a> and <a href="as_02_0103.html">Creating an AS Configuration from a New Specifications Template</a>.</li><li id="as_qs_0005__li51188993">Click <strong id="as_qs_0005__b538740602">Next</strong>.</li><li id="as_qs_0005__li42095554154139">(Optional) Add an AS policy to an AS group.<p id="as_qs_0005__p55040657154141"><a name="as_qs_0005__li42095554154139"></a><a name="li42095554154139"></a>On the displayed page, click <strong id="as_qs_0005__b57890580192252">Add AS Policy</strong>.</p> </li><li id="as_qs_0005__li61747774">Click <strong id="as_qs_0005__b1107671610279">Next</strong>.</li><li id="as_qs_0005__li18859061">On the displayed page, you can use an existing AS configuration or create an AS configuration. For details, see <a href="as_02_0102.html">Creating an AS Configuration from an Existing ECS Instance</a> and <a href="as_02_0103.html">Creating an AS Configuration from a New Specifications Template</a>.</li><li id="as_qs_0005__li51188993">Click <strong id="as_qs_0005__b1312727495">Next</strong>.</li><li id="as_qs_0005__li42095554154139">(Optional) Add an AS policy to an AS group.<p id="as_qs_0005__p55040657154141"><a name="as_qs_0005__li42095554154139"></a><a name="li42095554154139"></a>On the displayed page, click <strong id="as_qs_0005__b57890580192252">Add AS Policy</strong>.</p>
<div class="p" id="as_qs_0005__p50807348204020">Configure the required parameters, such as the <strong id="as_qs_0005__b7406051151815">Policy Type</strong>, <strong id="as_qs_0005__b14061151181817">Scaling Action</strong>, and <strong id="as_qs_0005__b1140775111813">Cooldown Period</strong>. For details, see <a href="as_04_0101.html">Dynamic Scaling</a> and <a href="as_04_0102.html">Scheduled Scaling</a>.<div class="note" id="as_qs_0005__note64665535"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="as_qs_0005__ul45118907"><li id="as_qs_0005__li3416986">If a scaling action is triggered by an AS policy, the cooldown period is whatever configured for that AS policy.</li><li id="as_qs_0005__li30752875">If a scaling action is triggered by manually changing the expected number of instances or by other actions, the cooldown period is whatever configured for the AS group.</li></ul> <div class="p" id="as_qs_0005__p50807348204020">Configure the required parameters, such as the <strong id="as_qs_0005__b7406051151815">Policy Type</strong>, <strong id="as_qs_0005__b14061151181817">Scaling Action</strong>, and <strong id="as_qs_0005__b1140775111813">Cooldown Period</strong>. For details, see <a href="as_04_0101.html">Dynamic Scaling</a> and <a href="as_04_0102.html">Scheduled Scaling</a>.<div class="note" id="as_qs_0005__note64665535"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="as_qs_0005__ul45118907"><li id="as_qs_0005__li3416986">If a scaling action is triggered by an AS policy, the cooldown period is whatever configured for that AS policy.</li><li id="as_qs_0005__li30752875">If a scaling action is triggered by manually changing the expected number of instances or by other actions, the cooldown period is whatever configured for the AS group.</li></ul>
</div></div> </div></div>
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</li> </li>
<li class="ulchildlink"><strong><a href="as_pro_0006.html">AS and Other Services</a></strong><br> <li class="ulchildlink"><strong><a href="as_pro_0006.html">AS and Other Services</a></strong><br>
</li> </li>
<li class="ulchildlink"><strong><a href="as_pro_0007.html">Permissions Management</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="as_pro_0008.html">User Permissions</a></strong><br> <li class="ulchildlink"><strong><a href="as_pro_0008.html">User Permissions</a></strong><br>
</li> </li>
<li class="ulchildlink"><strong><a href="en-us_topic_0042018372.html">Basic Concepts</a></strong><br> <li class="ulchildlink"><strong><a href="en-us_topic_0042018372.html">Basic Concepts</a></strong><br>

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<ul id="en-us_topic_0042018368__as_qs_0005_ul48303235"><li id="en-us_topic_0042018368__as_qs_0005_li32075938">If the ECS type specified in the AS configuration is not available in any of the AZs used by the AS group, the following situations will occur:<ul id="en-us_topic_0042018368__as_qs_0005_ul47472656114845"><li id="en-us_topic_0042018368__as_qs_0005_li46982333114845">If the AS group is disabled, it cannot be enabled again later.</li><li id="en-us_topic_0042018368__as_qs_0005_li20187820114845">If the AS group is enabled, its status will become abnormal when instances are added to it.</li></ul> <ul id="en-us_topic_0042018368__as_qs_0005_ul48303235"><li id="en-us_topic_0042018368__as_qs_0005_li32075938">If the ECS type specified in the AS configuration is not available in any of the AZs used by the AS group, the following situations will occur:<ul id="en-us_topic_0042018368__as_qs_0005_ul47472656114845"><li id="en-us_topic_0042018368__as_qs_0005_li46982333114845">If the AS group is disabled, it cannot be enabled again later.</li><li id="en-us_topic_0042018368__as_qs_0005_li20187820114845">If the AS group is enabled, its status will become abnormal when instances are added to it.</li></ul>
</li><li id="en-us_topic_0042018368__as_qs_0005_li63943666">If the ECS type specified in the AS configuration is only available in certain AZs used by the AS group, the ECS instances added by a scaling action are only deployed in the AZs where that ECS type is available. As a result, the instances in the AS group may not be evenly distributed.</li></ul> </li><li id="en-us_topic_0042018368__as_qs_0005_li63943666">If the ECS type specified in the AS configuration is only available in certain AZs used by the AS group, the ECS instances added by a scaling action are only deployed in the AZs where that ECS type is available. As a result, the instances in the AS group may not be evenly distributed.</li></ul>
</div> </div>
<div class="section" id="en-us_topic_0042018368__section3293739142316"><h4 class="sectiontitle">Procedure</h4><ol id="en-us_topic_0042018368__ol31192822"><li id="en-us_topic_0042018368__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="en-us_topic_0042018368__li5914166211049">Click <span><img id="en-us_topic_0042018368__image1095897611136" src="en-us_image_0223979402.png"></span> in the upper left corner to select a region and a project.</li><li id="en-us_topic_0042018368__li4101362146">Under <strong id="en-us_topic_0042018368__b134231730254">Computing</strong>, click <strong id="en-us_topic_0042018368__b154313309511">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="en-us_topic_0042018368__b1843118301658">Instance Scaling</strong>.</li><li id="en-us_topic_0042018368__li23565055">Click <strong id="en-us_topic_0042018368__b1683477286">Create AS Group</strong>.</li><li id="en-us_topic_0042018368__li10758903">Set parameters, such as <strong id="en-us_topic_0042018368__b856136513">Name</strong>, <strong id="en-us_topic_0042018368__b1249296979">Max. Instances</strong>, <strong id="en-us_topic_0042018368__b485511824">Min. Instances</strong>, and <strong id="en-us_topic_0042018368__b689431470">Expected Instances</strong>. <a href="#en-us_topic_0042018368__table63081199191521">Table 1</a> describes the key parameters to be configured. <div class="section" id="en-us_topic_0042018368__section3293739142316"><h4 class="sectiontitle">Procedure</h4><ol id="en-us_topic_0042018368__ol31192822"><li id="en-us_topic_0042018368__en-us_topic_0118498861_l67f1c4bb070b4f3d9b83021e83da345b">Log in to the management console.</li><li id="en-us_topic_0042018368__li5914166211049">Click <span><img id="en-us_topic_0042018368__image1095897611136" src="en-us_image_0223979402.png"></span> in the upper left corner to select a region and a project.</li><li id="en-us_topic_0042018368__li4101362146">Under <strong id="en-us_topic_0042018368__b134231730254">Computing</strong>, click <strong id="en-us_topic_0042018368__b154313309511">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="en-us_topic_0042018368__b1843118301658">Instance Scaling</strong>.</li><li id="en-us_topic_0042018368__li23565055">Click <strong id="en-us_topic_0042018368__b49971186">Create AS Group</strong>.</li><li id="en-us_topic_0042018368__li10758903">Set parameters, such as <strong id="en-us_topic_0042018368__b821858629">Name</strong>, <strong id="en-us_topic_0042018368__b135644513">Max. Instances</strong>, <strong id="en-us_topic_0042018368__b2564816">Min. Instances</strong>, and <strong id="en-us_topic_0042018368__b537279324">Expected Instances</strong>. <a href="#en-us_topic_0042018368__table63081199191521">Table 1</a> describes the key parameters to be configured.
<div class="tablenoborder"><a name="en-us_topic_0042018368__table63081199191521"></a><a name="table63081199191521"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0042018368__table63081199191521" frame="border" border="1" rules="all"><caption><b>Table 1 </b>AS group parameters</caption><thead align="left"><tr id="en-us_topic_0042018368__en-us_topic_0042018368_row6789204401212"><th align="left" class="cellrowborder" valign="top" width="14.27%" id="mcps1.3.3.2.5.6.2.4.1.1"><p id="en-us_topic_0042018368__en-us_topic_0042018368_p187892448121">Parameter</p> <div class="tablenoborder"><a name="en-us_topic_0042018368__table63081199191521"></a><a name="table63081199191521"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0042018368__table63081199191521" frame="border" border="1" rules="all"><caption><b>Table 1 </b>AS group parameters</caption><thead align="left"><tr id="en-us_topic_0042018368__en-us_topic_0042018368_row6789204401212"><th align="left" class="cellrowborder" valign="top" width="14.27%" id="mcps1.3.3.2.5.6.2.4.1.1"><p id="en-us_topic_0042018368__en-us_topic_0042018368_p187892448121">Parameter</p>
</th> </th>
<th align="left" class="cellrowborder" valign="top" width="67.52%" id="mcps1.3.3.2.5.6.2.4.1.2"><p id="en-us_topic_0042018368__en-us_topic_0042018368_p8789644181214">Description</p> <th align="left" class="cellrowborder" valign="top" width="67.52%" id="mcps1.3.3.2.5.6.2.4.1.2"><p id="en-us_topic_0042018368__en-us_topic_0042018368_p8789644181214">Description</p>
@ -29,7 +29,7 @@
<tr id="en-us_topic_0042018368__en-us_topic_0042018368_row1784813441121"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p128471244101211">AZ</p> <tr id="en-us_topic_0042018368__en-us_topic_0042018368_row1784813441121"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p128471244101211">AZ</p>
</td> </td>
<td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p2847194471217">An AZ is a physical location where resources use independent power supply and networks. AZs are physically isolated but interconnected through an internal network.</p> <td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p2847194471217">An AZ is a physical location where resources use independent power supply and networks. AZs are physically isolated but interconnected through an internal network.</p>
<ul id="en-us_topic_0042018368__ul9790131365117"><li id="en-us_topic_0042018368__li107901813115119">If you require high availability, buy servers in difference AZs.</li><li id="en-us_topic_0042018368__li4790141395115">If you require low network latency, buy servers in the same AZ.</li></ul> <ul id="en-us_topic_0042018368__ul9790131365117"><li id="en-us_topic_0042018368__li107901813115119">If you require high availability, buy servers in different AZs.</li><li id="en-us_topic_0042018368__li4790141395115">If you require low network latency, buy servers in the same AZ.</li></ul>
<p id="en-us_topic_0042018368__en-us_topic_0042018368_p118474444124">To enhance application availability, the system evenly distributes your instances between AZs if multiple AZs have been selected.</p> <p id="en-us_topic_0042018368__en-us_topic_0042018368_p118474444124">To enhance application availability, the system evenly distributes your instances between AZs if multiple AZs have been selected.</p>
</td> </td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p1684864416126">N/A</p> <td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p1684864416126">N/A</p>
@ -82,13 +82,13 @@
</tr> </tr>
<tr id="en-us_topic_0042018368__en-us_topic_0042018368_row8857124410124"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p385514448127">Load Balancing</p> <tr id="en-us_topic_0042018368__en-us_topic_0042018368_row8857124410124"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p385514448127">Load Balancing</p>
</td> </td>
<td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p2855194416123">This parameter is optional. A load balancer automatically distributes traffic across all instances in an AS group to balance their service load. It improves fault tolerance of your applications and expands application service capabilities.</p> <td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p2855194416123">This parameter is optional. A load balancer automatically distributes traffic across all instances in an AS group to balance their service load. It improves the fault tolerance of your applications and expands application service capabilities.</p>
<div class="note" id="en-us_topic_0042018368__en-us_topic_0042018368_note185654410125"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul13856174491212"><li class="textintable" id="en-us_topic_0042018368__en-us_topic_0042018368_li1130614514120">Up to three load balancers can be added to an AS group.</li><li class="textintable" id="en-us_topic_0042018368__en-us_topic_0042018368_li13855164417124">After multiple load balancers are added to an AS group, multiple services can be concurrently listened to, thereby improving service scalability. If <strong id="en-us_topic_0042018368__b15335164444118">ELB health check</strong> is selected for <strong id="en-us_topic_0042018368__b634444494114">Health Check Method</strong>, when any one of the listeners detects that an instance becomes unhealthy, AS will replace it with a new one.</li></ul> <div class="note" id="en-us_topic_0042018368__en-us_topic_0042018368_note185654410125"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul13856174491212"><li class="textintable" id="en-us_topic_0042018368__en-us_topic_0042018368_li1130614514120">Up to three load balancers can be added to an AS group.</li><li class="textintable" id="en-us_topic_0042018368__en-us_topic_0042018368_li13855164417124">After multiple load balancers are added to an AS group, multiple services can be concurrently listened to, thereby improving service scalability. If <strong id="en-us_topic_0042018368__b15335164444118">ELB health check</strong> is selected for <strong id="en-us_topic_0042018368__b634444494114">Health Check Method</strong>, when any one of the listeners detects that an instance becomes unhealthy, AS will replace it with a new one.</li></ul>
</div></div> </div></div>
<p id="en-us_topic_0042018368__en-us_topic_0042018368_p14856154413127">If you select <strong id="en-us_topic_0042018368__b2111746507">Classic </strong><strong id="en-us_topic_0042018368__b1896228361">load balancer</strong>, configure the following parameters:</p> <p id="en-us_topic_0042018368__en-us_topic_0042018368_p14856154413127">If you select <strong id="en-us_topic_0042018368__b402670834">Classic </strong><strong id="en-us_topic_0042018368__b1694413994">load balancer</strong>, configure the following parameters:</p>
<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul178564444124"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li48565441125"><strong id="en-us_topic_0042018368__b1240071870">Load Balancer</strong></li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li8856844121211"><strong id="en-us_topic_0042018368__b673027161">Listener</strong></li></ul> <ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul178564444124"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li48565441125"><strong id="en-us_topic_0042018368__b1301437624">Load Balancer</strong></li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li8856844121211"><strong id="en-us_topic_0042018368__b480096984">Listener</strong></li></ul>
<div class="p" id="en-us_topic_0042018368__en-us_topic_0042018368_p0857144491215">If you select <strong id="en-us_topic_0042018368__b933678887">Enhanced load balancer</strong>, configure the following parameters:<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul2085664410128"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li4856644181210"><strong id="en-us_topic_0042018368__b1739082678">Load Balancer</strong></li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li18856844121217"><strong id="en-us_topic_0042018368__b1794725207">Backend ECS Group</strong></li></ul> <div class="p" id="en-us_topic_0042018368__en-us_topic_0042018368_p0857144491215">If you select <strong id="en-us_topic_0042018368__b190067252">Enhanced load balancer</strong>, configure the following parameters:<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul2085664410128"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li4856644181210"><strong id="en-us_topic_0042018368__b737310602">Load Balancer</strong></li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li18856844121217"><strong id="en-us_topic_0042018368__b1732379360">Backend ECS Group</strong></li></ul>
<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul1857174401219"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li158561544161217"><strong id="en-us_topic_0042018368__b2146719301">Backend Port</strong>: specifies the port on which a backend ECS listens for traffic.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li13857244191216"><strong id="en-us_topic_0042018368__b1928063246">Weight</strong>: determines the portion of requests a backend ECS processes compared to other backend ECSs added to the same listener.<p id="en-us_topic_0042018368__en-us_topic_0042018368_p10857844101212">For more information about load balancing, see <em id="en-us_topic_0042018368__i285314817583">Elastic Load Balancing User Guide</em><em id="en-us_topic_0042018368__i158608814586"></em><em id="en-us_topic_0042018368__i1586119818586"></em>.</p> <ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul1857174401219"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li158561544161217"><strong id="en-us_topic_0042018368__b238830569">Backend Port</strong>: specifies the port on which a backend ECS listens for traffic.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li13857244191216"><strong id="en-us_topic_0042018368__b1618703628">Weight</strong>: determines the portion of requests a backend ECS processes compared to other backend ECSs added to the same listener.<p id="en-us_topic_0042018368__en-us_topic_0042018368_p10857844101212">For more information about load balancing, see <em id="en-us_topic_0042018368__i285314817583">Elastic Load Balancing User Guide</em><em id="en-us_topic_0042018368__i13832792388"></em><em id="en-us_topic_0042018368__i158608814586"></em><em id="en-us_topic_0042018368__i1586119818586"></em><em id="en-us_topic_0042018368__i15280911155215"></em>.</p>
</li></ul> </li></ul>
</div> </div>
</td> </td>
@ -98,7 +98,7 @@
<tr id="en-us_topic_0042018368__en-us_topic_0042018368_row72391565451"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p118615444126">Instance Removal Policy</p> <tr id="en-us_topic_0042018368__en-us_topic_0042018368_row72391565451"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p118615444126">Instance Removal Policy</p>
</td> </td>
<td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p1186184441218">Controls which instances are first to be removed during scale in. If specified conditions are met, scaling actions are triggered to remove instances. You can choose from any of the following instance removal policies:</p> <td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p1186184441218">Controls which instances are first to be removed during scale in. If specified conditions are met, scaling actions are triggered to remove instances. You can choose from any of the following instance removal policies:</p>
<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul286114444128"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li18619448128"><strong id="en-us_topic_0042018368__b133217409443">Oldest instance created from oldest AS configuration</strong>: The oldest instance created from the oldest configuration is removed from the AS group first.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li2861174491215"><strong id="en-us_topic_0042018368__b1856704313446">Newest instance created from oldest AS configuration</strong>: The newest instance created from the oldest configuration is removed from the AS group first.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1086111448122"><strong id="en-us_topic_0042018368__b2092547223">Oldest instance</strong>: The oldest instance is removed from the AS group first.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li8861134461213"><strong id="en-us_topic_0042018368__b889748462">Newest instance</strong>: The latest instance is removed from the AS group first.</li></ul> <ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul286114444128"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li18619448128"><strong id="en-us_topic_0042018368__b133217409443">Oldest instance created from oldest AS configuration</strong>: The oldest instance created from the oldest configuration is removed from the AS group first.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li2861174491215"><strong id="en-us_topic_0042018368__b1856704313446">Newest instance created from oldest AS configuration</strong>: The newest instance created from the oldest configuration is removed from the AS group first.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1086111448122"><strong id="en-us_topic_0042018368__b173662381">Oldest instance</strong>: The oldest instance is removed from the AS group first.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li8861134461213"><strong id="en-us_topic_0042018368__b623892833">Newest instance</strong>: The latest instance is removed from the AS group first.</li></ul>
<div class="note" id="en-us_topic_0042018368__en-us_topic_0042018368_note11862164411127"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul28621044141218"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1386216443126">AS always balances instances across AZs first, regardless of which removal policy is used.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li2862944171212">Manually added ECS instances are the last to be removed. If AS does remove a manually added instance, it only removes the instance from the AS group. It does not delete instance. If multiple manually added instances must be removed, AS preferentially removes the earliest-added instance first.</li></ul> <div class="note" id="en-us_topic_0042018368__en-us_topic_0042018368_note11862164411127"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul28621044141218"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1386216443126">AS always balances instances across AZs first, regardless of which removal policy is used.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li2862944171212">Manually added ECS instances are the last to be removed. If AS does remove a manually added instance, it only removes the instance from the AS group. It does not delete instance. If multiple manually added instances must be removed, AS preferentially removes the earliest-added instance first.</li></ul>
</div></div> </div></div>
</td> </td>
@ -107,7 +107,7 @@
</tr> </tr>
<tr id="en-us_topic_0042018368__en-us_topic_0042018368_row10845205713440"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p1386364491216">EIP</p> <tr id="en-us_topic_0042018368__en-us_topic_0042018368_row10845205713440"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p1386364491216">EIP</p>
</td> </td>
<td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p20863204491220">If <strong id="en-us_topic_0042018368__b1144361525">EIP</strong> has been selected in an AS configuration for an AS group, an EIP is automatically bound to the ECS instance added by a scaling action to the AS group. If you select <strong id="en-us_topic_0042018368__b760133712442">Release</strong>, the EIP bound to an instance is released when the instance is removed from the AS group. Otherwise, the system unbinds the EIP from the instance, but does not release it when the instance is removed from the AS group.</p> <td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p20863204491220">If <strong id="en-us_topic_0042018368__b1248454467">EIP</strong> has been selected in an AS configuration for an AS group, an EIP is automatically bound to the ECS instance added by a scaling action to the AS group. If you select <strong id="en-us_topic_0042018368__b760133712442">Release</strong>, the EIP bound to an instance is released when the instance is removed from the AS group. Otherwise, the system unbinds the EIP from the instance, but does not release it when the instance is removed from the AS group.</p>
</td> </td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p15863184411215">N/A</p> <td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p15863184411215">N/A</p>
</td> </td>
@ -115,7 +115,7 @@
<tr id="en-us_topic_0042018368__en-us_topic_0042018368_row5516536460"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p5863124412126">Health Check Method</p> <tr id="en-us_topic_0042018368__en-us_topic_0042018368_row5516536460"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p5863124412126">Health Check Method</p>
</td> </td>
<td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p19864944131215">When a health check detects an unhealthy ECS instance, AS replaces it with a new one. You can choose from either of the following health check methods:</p> <td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p19864944131215">When a health check detects an unhealthy ECS instance, AS replaces it with a new one. You can choose from either of the following health check methods:</p>
<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul88654443129"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li15864164491210"><strong id="en-us_topic_0042018368__b1249703417466">ECS health check</strong>: checks ECS instance health status. If an instance is stopped or deleted, it is considered to be unhealthy. This method is selected by default. Using this method, the AS group periodically evaluates the running status of each instance based on the health check results. If the health check results show that an instance is unhealthy, AS removes the instance from the AS group.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li178651744121210"><strong id="en-us_topic_0042018368__b340430466">ELB health check</strong>: determines ECS running status using a load balancing listener. When a load balancing listener detects that an instance is unhealthy, AS removes the instance from the AS group.</li></ul> <ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul88654443129"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li15864164491210"><strong id="en-us_topic_0042018368__b1249703417466">ECS health check</strong>: checks ECS instance health status. If an instance is stopped or deleted, it is considered to be unhealthy. This method is selected by default. Using this method, the AS group periodically evaluates the running status of each instance based on the health check results. If the health check results show that an instance is unhealthy, AS removes the instance from the AS group.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li178651744121210"><strong id="en-us_topic_0042018368__b684447943">ELB health check</strong>: determines ECS running status using a load balancing listener. When a load balancing listener detects that an instance is unhealthy, AS removes the instance from the AS group.</li></ul>
</td> </td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p3865104461216">N/A</p> <td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p3865104461216">N/A</p>
</td> </td>
@ -129,8 +129,8 @@
</tr> </tr>
<tr id="en-us_topic_0042018368__en-us_topic_0042018368_row13867104411211"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p138669448120">Enterprise Project</p> <tr id="en-us_topic_0042018368__en-us_topic_0042018368_row13867104411211"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p138669448120">Enterprise Project</p>
</td> </td>
<td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p13866154411211">Specifies the enterprise project to which the AS group belongs. If an enterprise project is configured for an AS group, ECSs created in this AS group also belong to this enterprise project. If you do not specify an enterprise project, the <strong id="en-us_topic_0042018368__b346308085">default</strong> enterprise project will be used.</p> <td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p13866154411211">Specifies the enterprise project to which the AS group belongs. If an enterprise project is configured for an AS group, ECSs created in this AS group also belong to this enterprise project. If you do not specify an enterprise project, the <strong id="en-us_topic_0042018368__b2022430351">default</strong> enterprise project will be used.</p>
<div class="note" id="en-us_topic_0042018368__en-us_topic_0042018368_note786711444129"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul786711446121"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1786718445127">Value <strong id="en-us_topic_0042018368__b985395002">default</strong> indicates the default enterprise project. Resources that are not allocated to any enterprise projects under your account are displayed in the default enterprise project.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1186774420123">Enterprise project is an upgraded version of IAM. It allocates and manages resources of different projects.</li></ul> <div class="note" id="en-us_topic_0042018368__en-us_topic_0042018368_note786711444129"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul786711446121"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1786718445127">Value <strong id="en-us_topic_0042018368__b1086669395">default</strong> indicates the default enterprise project. Resources that are not allocated to any enterprise projects under your account are displayed in the default enterprise project.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1186774420123">Enterprise project is an upgraded version of IAM. It allocates and manages resources of different projects.</li></ul>
</div></div> </div></div>
</td> </td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p1886716448125">N/A</p> <td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.3.2.5.6.2.4.1.3 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p1886716448125">N/A</p>
@ -154,7 +154,7 @@
</tr> </tr>
<tr id="en-us_topic_0042018368__en-us_topic_0042018368_row13870164416127"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p4869164431213">Tag</p> <tr id="en-us_topic_0042018368__en-us_topic_0042018368_row13870164416127"><td class="cellrowborder" valign="top" width="14.27%" headers="mcps1.3.3.2.5.6.2.4.1.1 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p4869164431213">Tag</p>
</td> </td>
<td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p108698448126">If you have many resources of the same type, you can use tags to more easily manage your resources. You can identify specified resources quickly using the tags allocated to them.</p> <td class="cellrowborder" valign="top" width="67.52%" headers="mcps1.3.3.2.5.6.2.4.1.2 "><p id="en-us_topic_0042018368__en-us_topic_0042018368_p108698448126">If you have many resources of the same type, you can use tags to manage your resources. You can identify specified resources quickly using the tags allocated to them.</p>
<p id="en-us_topic_0042018368__en-us_topic_0042018368_p1386913443127">Each tag contains a key and a value. You can specify the key and value for each tag.</p> <p id="en-us_topic_0042018368__en-us_topic_0042018368_p1386913443127">Each tag contains a key and a value. You can specify the key and value for each tag.</p>
<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul087094451213"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li08691644161218">Key<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul286917444125"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li15869194413127">The key must be specified.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1086974413121">The key must be unique to the AS group.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li148691844121220">The key can include up to 36 characters. It can include digits, letters, underscores (_), and hyphens (-).</li></ul> <ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul087094451213"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li08691644161218">Key<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul286917444125"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li15869194413127">The key must be specified.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1086974413121">The key must be unique to the AS group.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li148691844121220">The key can include up to 36 characters. It can include digits, letters, underscores (_), and hyphens (-).</li></ul>
</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1987064431218">Value<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul1187054411210"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li17870154415121">The value is optional.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li188701444121218">A key can have only one value.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li198701044111218">The value can include up to 43 characters. It can include digits, letters, underscores (_), and hyphens (-).</li></ul> </li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li1987064431218">Value<ul id="en-us_topic_0042018368__en-us_topic_0042018368_ul1187054411210"><li id="en-us_topic_0042018368__en-us_topic_0042018368_li17870154415121">The value is optional.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li188701444121218">A key can have only one value.</li><li id="en-us_topic_0042018368__en-us_topic_0042018368_li198701044111218">The value can include up to 43 characters. It can include digits, letters, underscores (_), and hyphens (-).</li></ul>

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<p id="en-us_topic_0042018372__p18764141012532">For example, if you set the cooldown period to 300 seconds (5 minutes), and there is a scaling action scheduled for 10:32, but a previous scaling action was complete at 10:30, any alarm-triggered scaling actions will be denied during the cooldown period from 10:30 to 10:35, but the scheduled scaling action will still be triggered at 10:32. If the scheduled scaling action ends at 10:36, a new cooldown period starts at 10:36 and ends at 10:41.</p> <p id="en-us_topic_0042018372__p18764141012532">For example, if you set the cooldown period to 300 seconds (5 minutes), and there is a scaling action scheduled for 10:32, but a previous scaling action was complete at 10:30, any alarm-triggered scaling actions will be denied during the cooldown period from 10:30 to 10:35, but the scheduled scaling action will still be triggered at 10:32. If the scheduled scaling action ends at 10:36, a new cooldown period starts at 10:36 and ends at 10:41.</p>
</div> </div>
<div class="section" id="en-us_topic_0042018372__en-us_topic_0190954061_section1849311910328"><h4 class="sectiontitle">Bandwidth Scaling</h4><p id="en-us_topic_0042018372__en-us_topic_0190954061_p837923816281">AS automatically adjusts a bandwidth based on the scaling policies you configured.</p> <div class="section" id="en-us_topic_0042018372__en-us_topic_0190954061_section1849311910328"><h4 class="sectiontitle">Bandwidth Scaling</h4><p id="en-us_topic_0042018372__en-us_topic_0190954061_p837923816281">AS automatically adjusts a bandwidth based on the scaling policies you configured.</p>
<p id="en-us_topic_0042018372__en-us_topic_0190954061_p224816336219">After you configure a scaling policy as needed, when the trigger condition is met, AS automatically increases, decreases, or set the bandwidth to a specified value based on the policy you configured. Three types of bandwidth scaling policies are available, including the alarm, scheduled, and periodic policy.</p> <p id="en-us_topic_0042018372__en-us_topic_0190954061_p224816336219">After you configure a scaling policy as needed, when the trigger condition is met, AS automatically increases, decreases, or sets the bandwidth to a specified value based on the policy you configured. Three types of bandwidth scaling policies are available, including the alarm, scheduled, and periodic policy.</p>
</div> </div>
<div class="section" id="en-us_topic_0042018372__en-us_topic_0190954061_section209534610470"><h4 class="sectiontitle">Region</h4><p id="en-us_topic_0042018372__en-us_topic_0190954061_p21870981152814">A region is a geographic area where the resources used by AS are located.</p> <div class="section" id="en-us_topic_0042018372__en-us_topic_0190954061_section209534610470"><h4 class="sectiontitle">Region</h4><p id="en-us_topic_0042018372__en-us_topic_0190954061_p21870981152814">A region is a geographic area where the resources used by AS are located.</p>
<p id="en-us_topic_0042018372__en-us_topic_0190954061_p62621109152814">AZs in the same region can communicate with each other over an intranet, but AZs in different regions cannot.</p> <p id="en-us_topic_0042018372__en-us_topic_0190954061_p62621109152814">AZs in the same region can communicate with each other over an intranet, but AZs in different regions cannot.</p>
<p id="en-us_topic_0042018372__en-us_topic_0190954061_p26719071152814">Cloud data centers are deployed in locations around the world, including Europe and Asia, and AS applies to different regions. Deploying AS in different regions allows you to tailor policies to better suit your requirements. For example, applications can be designed to meet user requirements in specific regions or comply with local laws or regulations.</p> <p id="en-us_topic_0042018372__en-us_topic_0190954061_p26719071152814">Cloud data centers are deployed worldwide and AS applies to different regions. Deploying AS in different regions allows you to tailor policies to better suit your requirements. For example, applications can be designed to meet user requirements in specific regions or comply with local laws or regulations.</p>
</div> </div>
<div class="section" id="en-us_topic_0042018372__en-us_topic_0190954061_section1896064654713"><h4 class="sectiontitle">Project</h4><p id="en-us_topic_0042018372__en-us_topic_0190954061_p119601466475">A project is used to group and isolate OpenStack resources, including compute, storage, and network resources. A project can be a department or a project team. Multiple projects can be created under one account.</p> <div class="section" id="en-us_topic_0042018372__en-us_topic_0190954061_section1896064654713"><h4 class="sectiontitle">Project</h4><p id="en-us_topic_0042018372__en-us_topic_0190954061_p119601466475">A project is used to group and isolate OpenStack resources, including compute, storage, and network resources. A project can be a department or a project team. Multiple projects can be created under one account.</p>
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<a name="en-us_topic_0042018383"></a><a name="en-us_topic_0042018383"></a> <a name="en-us_topic_0042018383"></a><a name="en-us_topic_0042018383"></a>
<h1 class="topictitle1">What Is Auto Scaling?</h1> <h1 class="topictitle1">What Is Auto Scaling?</h1>
<div id="body8662426"><div class="section" id="en-us_topic_0042018383__section84763753511"><h4 class="sectiontitle">AS Introduction</h4><p id="en-us_topic_0042018383__p6288145215520">Auto Scaling (AS) helps you automatically scale Elastic Cloud Server (ECS) and bandwidth resources to keep up with changes in demand based on pre-configured AS policies. It allows you to add ECS instances or increase bandwidths to handle increases in load and also save money by removing resources that are sitting idle.</p> <div id="body8662426"><div class="section" id="en-us_topic_0042018383__section84763753511"><h4 class="sectiontitle">AS Introduction</h4><p id="en-us_topic_0042018383__p6288145215520">Auto Scaling (AS) helps you automatically scale Elastic Cloud Server (ECS) and bandwidth resources to keep up with changes in demand based on pre-configured AS policies. It allows you to add ECS instances or increase bandwidths to handle load increases and also save money by removing resources that are sitting idle.</p>
</div> </div>
<div class="section" id="en-us_topic_0042018383__section1648134755512"><h4 class="sectiontitle">Architecture</h4><p id="en-us_topic_0042018383__p8060118">AS allows you to scale ECS instances and bandwidths.</p> <div class="section" id="en-us_topic_0042018383__section1648134755512"><h4 class="sectiontitle">Architecture</h4><p id="en-us_topic_0042018383__p8060118">AS allows you to scale ECS instances and bandwidths.</p>
<ul id="en-us_topic_0042018383__ul1678357173113"><li id="en-us_topic_0042018383__li12783074311">Scaling control: You can configure AS policies, configure metric thresholds, and schedule when different scaling actions are taken. AS will trigger scaling actions on a repeating schedule, at a specific time, or when the configured thresholds are reached.</li><li id="en-us_topic_0042018383__li13522113415373">Policy configuration: You can configure alarm-based, scheduled, and periodic policies as needed.</li><li id="en-us_topic_0042018383__li158742451391">Alarm-based policies: You can configure scaling actions to be taken when alarm metrics such as vCPU, memory, disk, and inbound traffic reaches the thresholds.</li><li id="en-us_topic_0042018383__li1681414814617">Scheduled policies: You can schedule scaling actions to be taken at a specific time.</li><li id="en-us_topic_0042018383__li196121833124918">Periodic policies: You can configure scaling actions to be taken at scheduled intervals, a specific time, or within a particular time range.</li><li id="en-us_topic_0042018383__li95761439517">When Cloud Eye generates an alarm for a monitoring metric, for example, CPU usage, AS automatically increases or decreases the number of instances in the AS group or the bandwidths.</li><li id="en-us_topic_0042018383__li735815075415">When the configured triggering time arrives, a scaling action is triggered to increase or decrease the number of ECS instances or the bandwidths.</li></ul> <ul id="en-us_topic_0042018383__ul1678357173113"><li id="en-us_topic_0042018383__li12783074311">Scaling control: You can configure AS policies, configure metric thresholds, and schedule when different scaling actions are taken. AS will trigger scaling actions on a repeating schedule, at a specific time, or when the configured thresholds are reached.</li><li id="en-us_topic_0042018383__li13522113415373">Policy configuration: You can configure alarm-based, scheduled, and periodic policies as needed.</li><li id="en-us_topic_0042018383__li158742451391">Alarm-based policies: You can configure scaling actions to be taken when alarm metrics such as vCPU, memory, disk, and inbound traffic reach the thresholds.</li><li id="en-us_topic_0042018383__li1681414814617">Scheduled policies: You can schedule scaling actions to be taken at a specific time.</li><li id="en-us_topic_0042018383__li196121833124918">Periodic policies: You can configure scaling actions to be taken at scheduled intervals, at specific time, or within a particular time range.</li><li id="en-us_topic_0042018383__li95761439517">When Cloud Eye generates an alarm for a monitoring metric, for example, CPU usage, AS automatically increases or decreases the number of instances in the AS group or the bandwidths.</li><li id="en-us_topic_0042018383__li735815075415">When the configured triggering time arrives, a scaling action is triggered to increase or decrease the number of ECS instances or the bandwidths.</li></ul>
<div class="fignone" id="en-us_topic_0042018383__fig09227462567"><span class="figcap"><b>Figure 1 </b>AS architecture</span><br><span><img id="en-us_topic_0042018383__image792334620566" src="en-us_image_0284722761.png"></span></div> <div class="fignone" id="en-us_topic_0042018383__fig09227462567"><span class="figcap"><b>Figure 1 </b>AS architecture</span><br><span><img id="en-us_topic_0042018383__image792334620566" src="en-us_image_0284722761.png"></span></div>
</div> </div>
<div class="section" id="en-us_topic_0042018383__section72729910118"><h4 class="sectiontitle">Accessing AS</h4><p id="en-us_topic_0042018383__p1389155616912">The public cloud provides a web-based service management platform. You can access AS using HTTPS-compliant application programming interfaces (APIs) or the management console.</p> <div class="section" id="en-us_topic_0042018383__section72729910118"><h4 class="sectiontitle">Accessing AS</h4><p id="en-us_topic_0042018383__p1389155616912">The public cloud provides a web-based service management platform. You can access AS using HTTPS-compliant application programming interfaces (APIs) or the management console.</p>
<ul id="en-us_topic_0042018383__ul7194201113916"><li id="en-us_topic_0042018383__li1263625417110">Calling APIs<p id="en-us_topic_0042018383__p863655410115"><a name="en-us_topic_0042018383__li1263625417110"></a><a name="li1263625417110"></a>Use this method if you are required to integrate AS on the public cloud into a third-party system for secondary development. For details, see <em id="en-us_topic_0042018383__i12331164831013"></em><em id="en-us_topic_0042018383__i7332134812107"></em><em id="en-us_topic_0042018383__i11334148171012"></em><em id="en-us_topic_0042018383__i433612485109"></em><em id="en-us_topic_0042018383__i53382485101"></em><em id="en-us_topic_0042018383__i43391948181011"></em><em id="en-us_topic_0042018383__i2954192715275"></em><em id="en-us_topic_0042018383__i9340124818107">Auto Scaling API Reference</em>.</p> <ul id="en-us_topic_0042018383__ul7194201113916"><li id="en-us_topic_0042018383__li1263625417110">Calling APIs<p id="en-us_topic_0042018383__p356025614253"><a name="en-us_topic_0042018383__li1263625417110"></a><a name="li1263625417110"></a>Use this method if you are required to integrate AS on the public cloud into a third-party system for secondary development. For more information, see <em id="en-us_topic_0042018383__i13246134615432"></em><em id="en-us_topic_0042018383__i0246184694312"></em><em id="en-us_topic_0042018383__i32461146154313"></em><em id="en-us_topic_0042018383__i192461246134310"></em><em id="en-us_topic_0042018383__i6246144624317"></em><em id="en-us_topic_0042018383__i15246104694313"></em><em id="en-us_topic_0042018383__i424664618437">Auto Scaling API Reference</em><em id="en-us_topic_0042018383__i14246194694310"></em>.</p>
</li><li id="en-us_topic_0042018383__li61956111792">Management console<p id="en-us_topic_0042018383__p17604214141113"><a name="en-us_topic_0042018383__li61956111792"></a><a name="li61956111792"></a>Use this method if you do not need to integrate AS with a third-party system.</p> </li><li id="en-us_topic_0042018383__li61956111792">Management console<p id="en-us_topic_0042018383__p17604214141113"><a name="en-us_topic_0042018383__li61956111792"></a><a name="li61956111792"></a>Use this method if you do not need to integrate AS with a third-party system.</p>
<p id="en-us_topic_0042018383__p6605714131115">After registering on the public cloud, log in to the management console and select <strong id="en-us_topic_0042018383__b15215112817373">Auto Scaling</strong> from the service list on the homepage.</p> <p id="en-us_topic_0042018383__p6605714131115">After registering on the public cloud, log in to the management console and select <strong id="en-us_topic_0042018383__b15215112817373">Auto Scaling</strong> from the service list on the homepage.</p>
</li></ul> </li></ul>

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</li> </li>
<li class="ulchildlink"><strong><a href="as_06_0100.html">AS Group and Instance Monitoring</a></strong><br> <li class="ulchildlink"><strong><a href="as_06_0100.html">AS Group and Instance Monitoring</a></strong><br>
</li> </li>
<li class="ulchildlink"><strong><a href="as_07_0100.html">Permissions Management</a></strong><br>
</li>
</ul> </ul>
</div> </div>

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</th> </th>
</tr> </tr>
</thead> </thead>
<tbody><tr id="en-us_topic_0044453521__row7769163210014"><td class="cellrowborder" valign="top" width="22%" headers="mcps1.3.1.1.3.1.1 "><p id="en-us_topic_0044453521__p157691737409">2022-09-06</p> <tbody><tr id="en-us_topic_0044453521__row9370629123211"><td class="cellrowborder" valign="top" width="22%" headers="mcps1.3.1.1.3.1.1 "><p id="en-us_topic_0044453521__p17370329163219">2023-03-31</p>
</td>
<td class="cellrowborder" valign="top" width="78%" headers="mcps1.3.1.1.3.1.2 "><p id="en-us_topic_0044453521__p1288094573219">Added the following content:</p>
<ul id="en-us_topic_0044453521__ul18991939203310"><li id="en-us_topic_0044453521__li1989914393337">Section <a href="as_pro_0007.html">Permission Management</a> in <em id="en-us_topic_0044453521__i1689713217516">Service Overview</em>.</li><li id="en-us_topic_0044453521__li49641452347">Section <a href="as_07_0100.html">Permission Management</a> in <em id="en-us_topic_0044453521__i112246571419">User Guide</em>.</li></ul>
</td>
</tr>
<tr id="en-us_topic_0044453521__row13930104018132"><td class="cellrowborder" valign="top" width="22%" headers="mcps1.3.1.1.3.1.1 "><p id="en-us_topic_0044453521__p15931164031317">2023-02-08</p>
</td>
<td class="cellrowborder" valign="top" width="78%" headers="mcps1.3.1.1.3.1.2 "><p id="en-us_topic_0044453521__p693184081318">This release incorporates the following change:</p>
<p id="en-us_topic_0044453521__p17900205511315">Redesigned the table structure in <a href="as_pro_0002.html">Instance Lifecycle</a>.</p>
</td>
</tr>
<tr id="en-us_topic_0044453521__row7769163210014"><td class="cellrowborder" valign="top" width="22%" headers="mcps1.3.1.1.3.1.1 "><p id="en-us_topic_0044453521__p157691737409">2022-09-06</p>
</td> </td>
<td class="cellrowborder" valign="top" width="78%" headers="mcps1.3.1.1.3.1.2 "><p id="en-us_topic_0044453521__p64451731012">The release incorporates the following changes:</p> <td class="cellrowborder" valign="top" width="78%" headers="mcps1.3.1.1.3.1.2 "><p id="en-us_topic_0044453521__p64451731012">The release incorporates the following changes:</p>
<p id="en-us_topic_0044453521__p552165554717">Optimized keywords.</p> <p id="en-us_topic_0044453521__p552165554717">Optimized keywords.</p>

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@ -49,7 +49,7 @@
<div class="p" id="en-us_topic_0112331243__p2787840394913">To create an alarm rule, configure the following parameters:<ul id="en-us_topic_0112331243__ul340997094947"><li id="en-us_topic_0112331243__li2774219594947">Rule Name<p id="en-us_topic_0112331243__p2649132795040"><a name="en-us_topic_0112331243__li2774219594947"></a><a name="li2774219594947"></a>Specifies the name of the new alarm rule, for example, <strong id="en-us_topic_0112331243__b842352706172220">as-alarm-7o1u</strong>.</p> <div class="p" id="en-us_topic_0112331243__p2787840394913">To create an alarm rule, configure the following parameters:<ul id="en-us_topic_0112331243__ul340997094947"><li id="en-us_topic_0112331243__li2774219594947">Rule Name<p id="en-us_topic_0112331243__p2649132795040"><a name="en-us_topic_0112331243__li2774219594947"></a><a name="li2774219594947"></a>Specifies the name of the new alarm rule, for example, <strong id="en-us_topic_0112331243__b842352706172220">as-alarm-7o1u</strong>.</p>
</li><li id="en-us_topic_0112331243__li22625889502">Trigger Condition<p id="en-us_topic_0112331243__p182080359512"><a name="en-us_topic_0112331243__li22625889502"></a><a name="li22625889502"></a>Select a monitoring metric and trigger condition based on the metric. <a href="#en-us_topic_0112331243__table46471722185419">Table 2</a> lists the supported monitoring metrics. An example value is <strong id="en-us_topic_0112331243__b79130453388">Outbound Bandwidth</strong><strong id="en-us_topic_0112331243__b883518145391"> Avg. &gt; 100 bit/s</strong>.</p> </li><li id="en-us_topic_0112331243__li22625889502">Trigger Condition<p id="en-us_topic_0112331243__p182080359512"><a name="en-us_topic_0112331243__li22625889502"></a><a name="li22625889502"></a>Select a monitoring metric and trigger condition based on the metric. <a href="#en-us_topic_0112331243__table46471722185419">Table 2</a> lists the supported monitoring metrics. An example value is <strong id="en-us_topic_0112331243__b79130453388">Outbound Bandwidth</strong><strong id="en-us_topic_0112331243__b883518145391"> Avg. &gt; 100 bit/s</strong>.</p>
</li><li id="en-us_topic_0112331243__li2578691895017">Monitoring Interval<p id="en-us_topic_0112331243__p3466834095116"><a name="en-us_topic_0112331243__li2578691895017"></a><a name="li2578691895017"></a>Specifies the period for the metric, for example, 5 minutes.</p> </li><li id="en-us_topic_0112331243__li2578691895017">Monitoring Interval<p id="en-us_topic_0112331243__p3466834095116"><a name="en-us_topic_0112331243__li2578691895017"></a><a name="li2578691895017"></a>Specifies the period for the metric, for example, 5 minutes.</p>
</li><li id="en-us_topic_0112331243__li4453899495026">Consecutive Occurrences<p id="en-us_topic_0112331243__p4052459495128"><a name="en-us_topic_0112331243__li4453899495026"></a><a name="li4453899495026"></a>Specifies the number of consecutive times, for example, one time, for triggering a scaling action during a monitoring period.</p> </li><li id="en-us_topic_0112331243__li4453899495026">Consecutive Occurrences<p id="en-us_topic_0112331243__p1431103103010"><a name="en-us_topic_0112331243__li4453899495026"></a><a name="li4453899495026"></a>Specifies the number of consecutive periods in which the triggering condition is met for triggering a scaling action.</p>
</li></ul> </li></ul>
</div> </div>
</td> </td>
@ -114,7 +114,7 @@
</li><li id="en-us_topic_0112331243__en-us_topic_0042018368_li43568140181428">After setting the parameters, click <strong id="en-us_topic_0112331243__b842352706143946">Create Now</strong>.<p id="en-us_topic_0112331243__p2412469711411">The newly created bandwidth scaling policy is displayed on the <strong id="en-us_topic_0112331243__b842352706181654">Bandwidth Scaling</strong> page and is in <strong id="en-us_topic_0112331243__b842352706181723">Enabled</strong> state by default.</p> </li><li id="en-us_topic_0112331243__en-us_topic_0042018368_li43568140181428">After setting the parameters, click <strong id="en-us_topic_0112331243__b842352706143946">Create Now</strong>.<p id="en-us_topic_0112331243__p2412469711411">The newly created bandwidth scaling policy is displayed on the <strong id="en-us_topic_0112331243__b842352706181654">Bandwidth Scaling</strong> page and is in <strong id="en-us_topic_0112331243__b842352706181723">Enabled</strong> state by default.</p>
</li></ol> </li></ol>
</div> </div>
<div class="section" id="en-us_topic_0112331243__section14132201851120"><h4 class="sectiontitle">Creating a Scheduled or Periodic Bandwidth Scaling Policy</h4><ol id="en-us_topic_0112331243__ol1477940132615"><li id="en-us_topic_0112331243__li152781131584">Log in to the management console.</li><li id="en-us_topic_0112331243__li5991134622618">Click <span><img id="en-us_topic_0112331243__image14283173102317" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="en-us_topic_0112331243__li799124614262">Under <strong id="en-us_topic_0112331243__b13906349155020">Computing</strong>, click <strong id="en-us_topic_0112331243__b292616493502">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="en-us_topic_0112331243__b59261949175010">Bandwidth Scaling</strong>.</li><li id="en-us_topic_0112331243__li99911146122611">Click <strong id="en-us_topic_0112331243__b602473779">Create Bandwidth Scaling Policy</strong>.</li><li id="en-us_topic_0112331243__li13991164610264">Set parameters, such as the policy name, policy type, and trigger condition. For details, see <a href="#en-us_topic_0112331243__table085923816615">Table 3</a>. <div class="section" id="en-us_topic_0112331243__section14132201851120"><h4 class="sectiontitle">Creating a Scheduled or Periodic Bandwidth Scaling Policy</h4><ol id="en-us_topic_0112331243__ol1477940132615"><li id="en-us_topic_0112331243__li152781131584">Log in to the management console.</li><li id="en-us_topic_0112331243__li5991134622618">Click <span><img id="en-us_topic_0112331243__image14283173102317" src="en-us_image_0210485079.png"></span> in the upper left corner to select a region and a project.</li><li id="en-us_topic_0112331243__li799124614262">Under <strong id="en-us_topic_0112331243__b13906349155020">Computing</strong>, click <strong id="en-us_topic_0112331243__b292616493502">Auto Scaling</strong>. In the navigation pane on the left, choose <strong id="en-us_topic_0112331243__b59261949175010">Bandwidth Scaling</strong>.</li><li id="en-us_topic_0112331243__li99911146122611">Click <strong id="en-us_topic_0112331243__b1547674992">Create Bandwidth Scaling Policy</strong>.</li><li id="en-us_topic_0112331243__li13991164610264">Set parameters, such as the policy name, policy type, and trigger condition. For details, see <a href="#en-us_topic_0112331243__table085923816615">Table 3</a>.
<div class="tablenoborder"><a name="en-us_topic_0112331243__table085923816615"></a><a name="table085923816615"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0112331243__table085923816615" frame="border" border="1" rules="all"><caption><b>Table 3 </b>Scheduled or periodic policy parameters</caption><thead align="left"><tr id="en-us_topic_0112331243__row11860143815611"><th align="left" class="cellrowborder" valign="top" width="15%" id="mcps1.3.4.2.5.2.2.4.1.1"><p id="en-us_topic_0112331243__p75748481205">Parameter</p> <div class="tablenoborder"><a name="en-us_topic_0112331243__table085923816615"></a><a name="table085923816615"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0112331243__table085923816615" frame="border" border="1" rules="all"><caption><b>Table 3 </b>Scheduled or periodic policy parameters</caption><thead align="left"><tr id="en-us_topic_0112331243__row11860143815611"><th align="left" class="cellrowborder" valign="top" width="15%" id="mcps1.3.4.2.5.2.2.4.1.1"><p id="en-us_topic_0112331243__p75748481205">Parameter</p>
</th> </th>
<th align="left" class="cellrowborder" valign="top" width="67%" id="mcps1.3.4.2.5.2.2.4.1.2"><p id="en-us_topic_0112331243__p95829881205">Description</p> <th align="left" class="cellrowborder" valign="top" width="67%" id="mcps1.3.4.2.5.2.2.4.1.2"><p id="en-us_topic_0112331243__p95829881205">Description</p>
@ -153,7 +153,8 @@
</li><li id="en-us_topic_0112331243__li36075185115124">Interval<ul id="en-us_topic_0112331243__ul5794335214657"><li id="en-us_topic_0112331243__li5864078114649">One day</li><li id="en-us_topic_0112331243__li5800498914649">One week</li><li id="en-us_topic_0112331243__li5228286014649">One month</li></ul> </li><li id="en-us_topic_0112331243__li36075185115124">Interval<ul id="en-us_topic_0112331243__ul5794335214657"><li id="en-us_topic_0112331243__li5864078114649">One day</li><li id="en-us_topic_0112331243__li5800498914649">One week</li><li id="en-us_topic_0112331243__li5228286014649">One month</li></ul>
</li></ul> </li></ul>
</td> </td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.4.2.5.2.2.4.1.3 "><p id="en-us_topic_0112331243__p531365191205">N/A</p> <td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.4.2.5.2.2.4.1.3 "><p id="en-us_topic_0112331243__p29434348536">N/A</p>
<p id="en-us_topic_0112331243__p2423327613"></p>
</td> </td>
</tr> </tr>
<tr id="en-us_topic_0112331243__row17860438161"><td class="cellrowborder" valign="top" width="15%" headers="mcps1.3.4.2.5.2.2.4.1.1 "><p id="en-us_topic_0112331243__p889816412711">Triggered At</p> <tr id="en-us_topic_0112331243__row17860438161"><td class="cellrowborder" valign="top" width="15%" headers="mcps1.3.4.2.5.2.2.4.1.1 "><p id="en-us_topic_0112331243__p889816412711">Triggered At</p>
@ -188,7 +189,7 @@
</tbody> </tbody>
</table> </table>
</div> </div>
</li><li id="en-us_topic_0112331243__li5766173553011">After setting the parameters, click <strong id="en-us_topic_0112331243__b159840327">Create Now</strong>.</li></ol> </li><li id="en-us_topic_0112331243__li5766173553011">After setting the parameters, click <strong id="en-us_topic_0112331243__b1779807790">Create Now</strong>.</li></ol>
</div> </div>
</div> </div>
<div> <div>

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