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ELB_UMN_0428

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Reviewed-by: Hajba, László Antal <laszlo-antal.hajba@t-systems.com>
Co-authored-by: zhoumeng <zhoumeng35@huawei.com>
Co-committed-by: zhoumeng <zhoumeng35@huawei.com>
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zhoumeng 2023-05-24 19:31:42 +00:00 committed by zuul
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</li>
<li class="ulchildlink"><strong><a href="elb_faq_0205.html">Certificates</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0207.html">Monitoring</a></strong><br>
</li>
</ul>
</div>

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<h1 class="topictitle1">When Does a Health Check Start?</h1>
<div id="body1572400442244"><p id="elb_faq_0002__p386253613413">After a backend server is added to a backend server group, the health check is performed at a random time during the first interval and then at the specified interval.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0204.html">Health Checks</a></div>
</div>
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<h1 class="topictitle1">Do Maximum Retries Include Health Checks That Consider Backend Servers Unhealthy?</h1>
<div id="body1572400442247"><p id="elb_faq_0003__p118621136124115">Yes. Maximum retries are the maximum number of health checks after which a backend server is detected healthy or the maximum number of health checks after which the same backend server is detected unhealthy.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0204.html">Health Checks</a></div>
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<pre class="screen" id="elb_faq_0024__screen4768112823913">sysctl -q net.ipv4.icmp_ratelimit</pre>
<p id="elb_faq_0024__p1811918431964">The default rate limit is <strong id="elb_faq_0024__b842352706193458">1000</strong>.</p>
<pre class="screen" id="elb_faq_0024__screen7265195210611">sysctl -q net.ipv4.icmp_ratemask</pre>
<p id="elb_faq_0024__p52451533713">The default rate mask is <strong id="elb_faq_0024__b398915293">6168</strong>.</p>
<p id="elb_faq_0024__p52451533713">The default rate mask is <strong id="elb_faq_0024__b325887324">6168</strong>.</p>
<p id="elb_faq_0024__p74763433302">If the returned value of the first command is the default value or <strong id="elb_faq_0024__b842352706103935">0</strong>, run the following command to remove the rate limit of Port Unreachable messages:</p>
<pre class="screen" id="elb_faq_0024__screen187541426251">sysctl -w net.ipv4.icmp_ratemask=6160</pre>
<p id="elb_faq_0024__p178268102918">For more information, see the <em id="elb_faq_0024__i842352697103837">Linux Programmer's Manual</em>. On the Linux CLI, run the following command to display the manual:</p>

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<h1 class="topictitle1">How Can I Check the Network Configuration of a Backend Server?</h1>
<div id="body8662426"><ol id="elb_faq_0040__en-us_topic_0100578555_ol51835414175346"><li id="elb_faq_0040__en-us_topic_0100578555_li26028006175346">Check whether the security group of the server is correctly configured.<ol type="a" id="elb_faq_0040__en-us_topic_0100578555_ol15120255104222"><li id="elb_faq_0040__en-us_topic_0100578555_li8965360104233">On the server details page, view the security group.</li><li id="elb_faq_0040__li1256125092715">Check whether the security group rules allow access from the corresponding IP address range.<ul id="elb_faq_0040__ul18999115652214"><li id="elb_faq_0040__li2330162013231">Dedicated load balancers: Check whether the security group of the backend server has inbound rules to allow traffic from the VPC where the load balancer works. If traffic is not allowed, add an inbound rule to allow traffic from the VPC to the backend server.</li><li id="elb_faq_0040__li613813371268"><span id="elb_faq_0040__ph988272093916">Shared</span> load balancers: Check whether the security group of the backend server has inbound rules to allow traffic from the 100.125.0.0/16. If traffic is not allowed, add an inbound rule to allow traffic from 100.125.0.0/16<span id="elb_faq_0040__ph1944315364202"></span> to the backend server.</li></ul>
<div class="caution" id="elb_faq_0040__note888257101120"><span class="cautiontitle"><img src="public_sys-resources/caution_3.0-en-us.png"> </span><div class="cautionbody"><ul id="elb_faq_0040__en-us_topic_0052569751_ul6236111617482"><li id="elb_faq_0040__en-us_topic_0052569751_li9236141624819"><span id="elb_faq_0040__en-us_topic_0052569751_ph5236916144812">Shared</span> load balancers: If <strong id="elb_faq_0040__en-us_topic_0052569751_b64011211441">Transfer Client IP Address</strong> is enabled for a TCP or UDP listener, there is no need to configure security group rules and <span id="elb_faq_0040__en-us_topic_0052569751_ph3592063517">firewall</span> rules to allow traffic from 100.125.0.0/16<span id="elb_faq_0040__en-us_topic_0052569751_ph2236716134818"></span> and client IP addresses to backend servers.</li><li id="elb_faq_0040__en-us_topic_0052569751_li523691644811"><span id="elb_faq_0040__en-us_topic_0052569751_ph687514266355">Dedicated load balancer</span>: If <strong id="elb_faq_0040__en-us_topic_0052569751_b16338185211569">IP as a Backend</strong> is not enabled for a load balancer that has a TCP or UDP listener, there is no need to configure security group rules and <span id="elb_faq_0040__en-us_topic_0052569751_ph19572195414362">firewall</span> rules to allow traffic from the VPC where the load balancer works to the backend servers associated with TCP or UDP listener.</li></ul>
<div class="caution" id="elb_faq_0040__note5214162212421"><span class="cautiontitle"><img src="public_sys-resources/caution_3.0-en-us.png"> </span><div class="cautionbody"><ul id="elb_faq_0040__ul6236111617482"><li id="elb_faq_0040__li9236141624819"><span id="elb_faq_0040__ph14393155975612">Shared</span> load balancers: If <strong id="elb_faq_0040__b9395195955618">Transfer Client IP Address</strong> is enabled for a TCP or UDP listener, there is no need to configure security group rules and <span id="elb_faq_0040__ph240305918568">Firewall</span> rules to allow traffic from 100.125.0.0/16, 100.126.0.0/16, and client IP addresses to backend servers.</li><li id="elb_faq_0040__li523691644811"><span id="elb_faq_0040__ph16422295714">Dedicated load balancers</span>: If <strong id="elb_faq_0040__b56447217577">IP as a Backend</strong> is not enabled for a load balancer that has a TCP or UDP listener, there is no need to configure security group rules and <span id="elb_faq_0040__ph176531526578">Firewall</span> rules to allow traffic from the backend subnet where the load balancer is deployed to the backend servers.</li></ul>
</div></div>
</li></ol>
</li><li id="elb_faq_0040__en-us_topic_0100578555_li2154564893111">Ensure that the firewalls of the subnet where the server resides does not intercept the traffic.<p id="elb_faq_0040__en-us_topic_0100578555_p2017488793128"><a name="elb_faq_0040__en-us_topic_0100578555_li2154564893111"></a><a name="en-us_topic_0100578555_li2154564893111"></a>In the navigation pane of the VPC console, choose <strong id="elb_faq_0040__b855515395272">Access Control</strong> &gt; <strong id="elb_faq_0040__b116901318153311">Firewalls</strong> and check whether the subnet allows traffic.</p>

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<h1 class="topictitle1">How Do I Check If There Is Excessive Access Delay?</h1>
<div id="body1537450788437"><ol id="elb_faq_0047__ol1689423216414"><li id="elb_faq_0047__li108941332134118">Bind an EIP to a backend server to make the applications accessible from the Internet and then check the access delay. In this way, you can determine whether the problem is caused by the client, load balancer, or applications.</li><li id="elb_faq_0047__li789443244111">Check the incoming traffic. If the incoming traffic exceeds the EIP bandwidth, there may be congestion and packet loss.<div class="note" id="elb_faq_0047__note87571310132318"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_faq_0047__p5757610192318">If the incoming traffic exceeds the available bandwidth, it does not mean that the bandwidth is fully used. In this case, you need perform further operations to locate the fault or increase the bandwidth.</p>
</div></div>
</li><li id="elb_faq_0047__li4894163254111">Check the load and security policies of backend servers. If backend servers are heavily loaded or they have security policies configured, they cannot quickly respond to requests from the associated load balancer.</li><li id="elb_faq_0047__li1894103284114">Check the health of backend servers based on the <strong id="elb_faq_0047__b1625320411729">Unhealthy Servers</strong> metric. If the applications are unstable and connections to the backend server time out, the retry mechanism will route the requests to another backend server. As a result, access to the applications will be successful but there will be more access delay.</li><li id="elb_faq_0047__li13894832114111">If the problem persists, contact customer service.</li></ol>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0127.html">Load Balancing Performance</a></div>
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</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0127.html">Service Performance and Load</a></div>
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0127.html">Load Balancing Performance</a></div>
</div>
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</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0127.html">Service Performance and Load</a></div>
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0127.html">Load Balancing Performance</a></div>
</div>
</div>

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</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0127.html">Service Performance and Load</a></div>
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0127.html">Load Balancing Performance</a></div>
</div>
</div>

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<h1 class="topictitle1">Does ELB Support FTP on Backend Servers?</h1>
<div id="body1546937781311"><p id="elb_faq_0057__p8060118">ELB does not support File Transfer Protocol (FTP), but supports Secure File Transfer Protocol (SFTP) on backend servers.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0211.html">ELB Functionality</a></div>
</div>
</div>

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<h1 class="topictitle1">Can I Configure Different Backend Ports for a Load Balancer?</h1>
<div id="body1546937780880"><p id="elb_faq_0059__p8060118">Yes. You can configure different backend ports for backend servers associated with a load balancer.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0211.html">ELB Functionality</a></div>
</div>
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<h1 class="topictitle1">What Is Quota?</h1>
<div id="body1549953425249"><div class="section" id="elb_faq_0065__section6321311611"><h4 class="sectiontitle">What Is Quota?</h4><p id="elb_faq_0065__en-us_topic_0040259342_p1415804616467">Quotas can limit the number or amount of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.</p>
<p id="elb_faq_0065__en-us_topic_0040259342_p547171214515">If the existing resource quota cannot meet your service requirements, you can apply for a higher quota.</p>
</div>
<div class="section" id="elb_faq_0065__section07760615438"><h4 class="sectiontitle">How Do I View My Quotas?</h4><ol id="elb_faq_0065__en-us_topic_0040259342_ol1222775692215"><li id="elb_faq_0065__en-us_topic_0040259342_li5648642910048">Log in to the management console.</li><li id="elb_faq_0065__en-us_topic_0040259342_li464234814566">Click <span><img id="elb_faq_0065__en-us_topic_0040259342_en-us_topic_0014250631_en-us_topic_0014250631_image1733511156361" src="en-us_image_0275513364.png"></span> in the upper left corner and select the desired region and project.</li><li id="elb_faq_0065__en-us_topic_0040259342_li3861581410048">In the upper right corner of the page, click <span><img id="elb_faq_0065__en-us_topic_0040259342_image99377514309" src="en-us_image_0152727234.png"></span>.<p id="elb_faq_0065__en-us_topic_0040259342_p1748884433119">The <strong id="elb_faq_0065__en-us_topic_0040259342_b695801964614">Service Quota</strong> page is displayed.</p>
</li><li id="elb_faq_0065__en-us_topic_0040259342_li1579070183211">View the used and total quota of each type of resources on the displayed page.<p id="elb_faq_0065__en-us_topic_0040259342_p97891720193417"><a name="elb_faq_0065__en-us_topic_0040259342_li1579070183211"></a><a name="en-us_topic_0040259342_li1579070183211"></a>If a quota cannot meet service requirements, apply for a higher quota.</p>
</li></ol>
</div>
<div class="section" id="elb_faq_0065__section457218466261"><h4 class="sectiontitle">How Do I Apply for a Higher Quota?</h4><p id="elb_faq_0065__en-us_topic_0040259342_p133802054172617">The system does not support online quota adjustment. If you need to adjust a quota, call the hotline or send an email to the customer service mailbox. Customer service personnel will timely process your request for quota adjustment and inform you of the real-time progress by making a call or sending an email.</p>
<p id="elb_faq_0065__en-us_topic_0040259342_p13745144852611">Before dialing the hotline number or sending an email, make sure that the following information has been obtained:</p>
<ul id="elb_faq_0065__en-us_topic_0040259342_ul37351029162712"><li id="elb_faq_0065__en-us_topic_0040259342_li12735132932714">Domain name, project name, and project ID, which can be obtained by performing the following operations:<p id="elb_faq_0065__en-us_topic_0040259342_p1973542918275"><a name="elb_faq_0065__en-us_topic_0040259342_li12735132932714"></a><a name="en-us_topic_0040259342_li12735132932714"></a>Log in to the management console using the cloud account, click the username in the upper right corner, select <strong id="elb_faq_0065__en-us_topic_0040259342_b171181053141511">My Credentials</strong> from the drop-down list, and obtain the domain name, project name, and project ID on the <strong id="elb_faq_0065__en-us_topic_0040259342_b1956165671712">My Credentials</strong> page.</p>
</li><li id="elb_faq_0065__en-us_topic_0040259342_li13735182917270">Quota information, which includes:<ul id="elb_faq_0065__en-us_topic_0040259342_ul6735102912273"><li id="elb_faq_0065__en-us_topic_0040259342_li1073516296277">Service name</li><li id="elb_faq_0065__en-us_topic_0040259342_li6735152972712">Quota type</li><li id="elb_faq_0065__en-us_topic_0040259342_li773592992718">Required quota</li></ul>
</li></ul>
<p id="elb_faq_0065__en-us_topic_0040259342_p126761744182712"><a href="https://open-telekom-cloud.com/en/contact" target="_blank" rel="noopener noreferrer">Learn how to obtain the service hotline and email address.</a></p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0201.html">Load Balancers</a></div>
</div>
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<h1 class="topictitle1">How Do I Test Sticky Sessions Using Linux Curl Commands?</h1>
<div id="body1568692772111"><ol id="elb_faq_0067__ol1225692695217"><li id="elb_faq_0067__li5256172655211">Prepare required resources.<ol type="a" id="elb_faq_0067__ol1119161413172"><li id="elb_faq_0067__li102014147176">Buy three ECSs, one as the client and the other two as backend servers.</li><li id="elb_faq_0067__li16704122631717">Create a load balancer and add an HTTP listener to the load balancer. Enable sticky sessions when you add the listener.</li></ol>
</li></ol><ol start="2" id="elb_faq_0067__ol1374244435219"><li id="elb_faq_0067__li126712675314">Start the HTTP service of the two backend servers.<p id="elb_faq_0067__p289912181537"><a name="elb_faq_0067__li126712675314"></a><a name="li126712675314"></a>Log in to a backend server and create a file named <strong id="elb_faq_0067__b753721151911">1.file</strong> in the current directory to mark this server.</p>
<p id="elb_faq_0067__p3192611205315">Run the following command in the current directory to start the HTTP service:</p>
<p id="elb_faq_0067__p12376122895310"><strong id="elb_faq_0067__b437619286536">nohup python –m SimpleHTTPServer 80 &amp;</strong></p>
<p id="elb_faq_0067__p178484287221">Run the following command to check whether the HTTP service is normal:</p>
<p id="elb_faq_0067__p1484832814221"><strong id="elb_faq_0067__b16848152812210">curl http://127.0.0.1:80</strong></p>
<p id="elb_faq_0067__p10848102892216"><span><img id="elb_faq_0067__image2084892832218" src="en-us_image_0193109154.jpg"></span></p>
<p id="elb_faq_0067__p594210402540">Log in to the other backend server and create a file named <strong id="elb_faq_0067__b73701131182114">2.file</strong> in the current directory.</p>
<p id="elb_faq_0067__p09821930195419">Run the following command in the current directory to start the HTTP service:</p>
<p id="elb_faq_0067__p1110713536548"><strong id="elb_faq_0067__b1107185325410">nohup python –m SimpleHTTPServer 80 &amp;</strong></p>
<p id="elb_faq_0067__p684820286228">Run the following command to check whether the HTTP service is normal:</p>
<p id="elb_faq_0067__p7848132882212"><strong id="elb_faq_0067__b284882842215">curl http://127.0.0.1:80</strong></p>
<p id="elb_faq_0067__p1584814283224"><span><img id="elb_faq_0067__image5848328102214" src="en-us_image_0193109171.jpg"></span></p>
</li></ol><ol start="3" id="elb_faq_0067__ol3257182718553"><li id="elb_faq_0067__li72573275551">Access the load balancer from the client and specify the cookie value.<p id="elb_faq_0067__p184832815222"><a name="elb_faq_0067__li72573275551"></a><a name="li72573275551"></a>The following is an example command. Change the parameters as needed. Ensure that the returned file names of each request are the same.</p>
<p id="elb_faq_0067__p16848728112219"><strong id="elb_faq_0067__b580515476294">curl --cookie "name=abcd" <em id="elb_faq_0067__i580516478294"> </em>http://</strong><strong id="elb_faq_0067__b1996181615457">ELB_IP:Port</strong></p>
<p id="elb_faq_0067__p158481028202214"><span><img id="elb_faq_0067__image1884819289220" src="en-us_image_0193109172.jpg"></span></p>
</li></ol>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0190.html">Sticky Sessions</a></div>
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<h1 class="topictitle1">What Do I Do If a Lot of Access Logs Are Generated During Health Checks?</h1>
<div id="body1568692772111"><ol id="elb_faq_0070__ol1537211945718"><li id="elb_faq_0070__li23801840131712">You can increase the health check interval by referring to <a href="en-us_topic_0162227063.html">Configuring a Health Check</a>.<p id="elb_faq_0070__p18514741479">Risk: After the health check interval is prolonged, the time for the load balancer to detect unhealthy servers will increase.</p>
</li><li id="elb_faq_0070__li452381210242">You can disable the health check by referring to <a href="elb_ug_hc_0003.html">Disabling a Health Check</a>.<p id="elb_faq_0070__p14371654152413">Risk: After health checks are disabled, the load balancer will not check the backend servers. If a backend server becomes faulty, the load balancer will still route requests to this server.</p>
</li></ol>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0204.html">Health Checks</a></div>
</div>
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<h1 class="topictitle1">Does ELB Support Wildcard Certificates?</h1>
<div id="body1568692772111"><p id="elb_faq_0073__p1362314415420">Yes. If the domain name of a wildcard certificate is *.test.com, domain names a.test.com, b.test.com, a.b.test.com, and c.d.test.com are supported.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0205.html">Certificates</a></div>
</div>
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<h1 class="topictitle1">Can Multiple Load Balancers Route Requests to One Backend Server?</h1>
<div id="body1568692772111"><p id="elb_faq_0075__p2039214685012">Yes. This is supported as long as the load balancers are in the same subnet as the backend server.</p>
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<h1 class="topictitle1">Does Each Backend Server Need an EIP to Receive Requests from a Public Network Load Balancer?</h1>
<div id="body1568692772111"><p id="elb_faq_0077__p8060118">No. There is no need to bind an EIP to each backend server because the load balancer routes requests through the private network.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0203.html">Backend Servers</a></div>
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<h1 class="topictitle1">Does ELB Support Persistent Connections?</h1>
<div id="body1568692772111"><p id="elb_faq_0079__p5925557112912">Yes.</p>
<p id="elb_faq_0079__p11959421132914">The connections between the client and load balancer are persistent connections. After a TCP persistent connection is established, the client continuously sends HTTP requests to the load balancer until the connection times out. The reuse of TCP connections reduces the costs for a large number of short connections.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0211.html">ELB Functionality</a></div>
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<h1 class="topictitle1">What Are the Differences Between Layer-7 Status Codes and Backend Status Codes in ELB Metrics?</h1>
<div id="body1568942365358"><p id="elb_faq_0081__p7725164781910">HTTP or HTTPS listeners terminate TCP connections. In other words, there are two TCP connections between the client and a backend server, one between the client and load balancer, and the other between the load balancer and backend server. The communication between the client and the backend server is divided into two parts. After receiving an HTTP request, the load balancer parses the request and routes the parsed request to the backend server for processing. The backend server returns a response to the load balancer after receiving the request. The load balancer then parses the response and returns the parsed response to the client. Therefore, there are two types of status codes: backend status codes returned by the backend server to the load balancer and Layer-7 status codes returned by the load balancer to the client.</p>
<p id="elb_faq_0081__p11726184717198">You may encounter the following situations:</p>
<ul id="elb_faq_0081__ul028655373415"><li id="elb_faq_0081__li12286155319342">The backend server returns a status code, and the load balancer directly transmits the status code to the client. In this case, the Layer-7 status code is the same as the backend status code.</li><li id="elb_faq_0081__li1282815453415">If the connection between the load balancer and backend server is abnormal or times out, the load balancer returns HTTP 502 or 504 to the client. </li><li id="elb_faq_0081__li582905623420">If the listener configuration or the request format or content is incorrect, the load balancer directly returns an HTTP 4xx status code or 502 to the client, and does not route the request to the backend server. In this case, there will be only a Layer-7 status code, but no backend status code.</li></ul>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0207.html">Monitoring</a></div>
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<h1 class="topictitle1">Will ELB Stop Distributing Traffic Immediately After a Listener Is Deleted?</h1>
<div id="body1571991423375"><ul id="elb_faq_0083__ul45561831144618"><li id="elb_faq_0083__li1155623113463">If a TCP or UDP listener is deleted, the load balancer immediately stops routing traffic because the client uses short connections to communicate with the load balancer.</li><li id="elb_faq_0083__li11270144012463">If an HTTP or HTTPS listener is deleted, persistent connections that have been established between the client and the load balancer will be kept alive until they time out, and therefore request routing is not affected. After the connections time out, the client stops sending requests over these connections. The default timeout duration is 300s.<div class="note" id="elb_faq_0083__note364292133919"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_faq_0083__p917213033913">The duration for which persistent connections are kept alive is called idle timeout, and this takes effect only for persistent connections established between the client and load balancer.</p>
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</li></ul>
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<div class="section" id="elb_faq_0090__section867518427319"><h4 class="sectiontitle">Layer 4 Load Balancing</h4><p id="elb_faq_0090__p10578835171913"></p>
<p id="elb_faq_0090__p157754342011">For load balancing at Layer 4 (TCP/UDP), you can enable <strong id="elb_faq_0090__b16174151214303">Transfer Client IP Address</strong> to obtain the source IP address.</p>
<ul id="elb_faq_0090__ul3140135223013"><li id="elb_faq_0090__li13140155233012"><strong id="elb_faq_0090__b6980112313279">Method 1 (for TCP or UDP listeners)</strong>: Enable <strong id="elb_faq_0090__b101155618413">Transfer Client IP Address</strong>.<ol id="elb_faq_0090__ol730222417346"><li id="elb_faq_0090__li330222433410">Perform the following steps to enable the function:<ol type="a" id="elb_faq_0090__ol16390953185514"><li id="elb_faq_0090__li677391520332">Log in to the management console.</li><li id="elb_faq_0090__li675519100420">In the upper left corner of the page, click <span><img id="elb_faq_0090__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001211126503.png"></span> and select the desired region and project.</li><li id="elb_faq_0090__li335918093210">Click <strong id="elb_faq_0090__b667829828">Service List</strong>. Under <strong id="elb_faq_0090__b1119839681"><span id="elb_faq_0090__ph395765684">Network</span></strong>, click <strong id="elb_faq_0090__b1994239027">Elastic Load Balance</strong>.</li><li id="elb_faq_0090__li1379615339436">In the load balancer list, click the name of the load balancer.</li><li id="elb_faq_0090__li475294174319">Click <strong id="elb_faq_0090__b417418053">Listeners</strong>.<ul id="elb_faq_0090__ul124372032185517"><li id="elb_faq_0090__li543763255519">To add a listener, click <strong id="elb_faq_0090__b1377149182415">Add Listener</strong>.</li><li id="elb_faq_0090__li12437132115511">To modify a listener, locate the listener, click <span><img id="elb_faq_0090__image18771457113315" src="en-us_image_0000001454530030.png"></span> on the right of its name, and click <strong id="elb_faq_0090__b388015743316">Modify Listener</strong>. In the <strong id="elb_faq_0090__b6881165715337">Modify Listener</strong> dialog box, modify the parameters as needed.</li></ul>
<ul id="elb_faq_0090__ul3140135223013"><li id="elb_faq_0090__li13140155233012"><strong id="elb_faq_0090__b6980112313279">Method 1 (for TCP or UDP listeners)</strong>: Enable <strong id="elb_faq_0090__b101155618413">Transfer Client IP Address</strong>.<div class="caution" id="elb_faq_0090__note163721259193419"><span class="cautiontitle"><img src="public_sys-resources/caution_3.0-en-us.png"> </span><div class="cautionbody"><ul id="elb_faq_0090__ul0161183124115"><li id="elb_faq_0090__li11982310114212">After this function is enabled, traffic, such as unidirectional download or push traffic, may be interrupted when backend servers are being migrated during the migration of the associated classic load balancer. After backend servers are migrated, retransmit the packets to restore the traffic.</li><li id="elb_faq_0090__li03069573459">After this function is enabled, the associated backend servers cannot be used as clients to access the listener.</li><li id="elb_faq_0090__li142889194478">If a backend server has been associated with the listener and health checks are enabled, enabling this function will check the health of the backend server, and traffic to this server will be interrupted for two health check intervals.</li></ul>
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<ol id="elb_faq_0090__ol730222417346"><li id="elb_faq_0090__li330222433410">Perform the following steps to enable the function:<ol type="a" id="elb_faq_0090__ol16390953185514"><li id="elb_faq_0090__li677391520332">Log in to the management console.</li><li id="elb_faq_0090__li675519100420">In the upper left corner of the page, click <span><img id="elb_faq_0090__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001211126503.png"></span> and select the desired region and project.</li><li id="elb_faq_0090__li194625132711">Hover on <span><img id="elb_faq_0090__en-us_topic_0052569751_image762510132322" src="en-us_image_0000001417088430.png"></span> in the upper left corner to display <strong id="elb_faq_0090__en-us_topic_0052569751_b9121102522212">Service List</strong> and choose <strong id="elb_faq_0090__en-us_topic_0052569751_b61222025142217">Network</strong> &gt; <strong id="elb_faq_0090__en-us_topic_0052569751_b4124425142210">Elastic Load Balancing</strong>. </li><li id="elb_faq_0090__li1379615339436">In the load balancer list, click the name of the load balancer.</li><li id="elb_faq_0090__li475294174319">Click <strong id="elb_faq_0090__b393269167">Listeners</strong>.<ul id="elb_faq_0090__ul124372032185517"><li id="elb_faq_0090__li543763255519">To add a listener, click <strong id="elb_faq_0090__b1377149182415">Add Listener</strong>.</li><li id="elb_faq_0090__li12437132115511">To modify a listener, locate the listener, click <span><img id="elb_faq_0090__image18771457113315" src="en-us_image_0000001454530030.png"></span> on the right of its name, and click <strong id="elb_faq_0090__b388015743316">Modify Listener</strong>. In the <strong id="elb_faq_0090__b6881165715337">Modify Listener</strong> dialog box, modify the parameters as needed.</li></ul>
</li><li id="elb_faq_0090__li3100135715344">Enable <strong id="elb_faq_0090__b745821111385">Transfer Client IP Address</strong>.</li></ol>
</li><li id="elb_faq_0090__li99008095116">Configure security groups, network ACLs, and OS and software security policies so that IP addresses of the clients can access these backend servers.<div class="caution" id="elb_faq_0090__note9310112602213"><span class="cautiontitle"><img src="public_sys-resources/caution_3.0-en-us.png"> </span><div class="cautionbody"><ul id="elb_faq_0090__en-us_topic_0052569751_ul6236111617482"><li id="elb_faq_0090__en-us_topic_0052569751_li9236141624819"><span id="elb_faq_0090__en-us_topic_0052569751_ph5236916144812">Shared</span> load balancers: If <strong id="elb_faq_0090__en-us_topic_0052569751_b64011211441">Transfer Client IP Address</strong> is enabled for a TCP or UDP listener, there is no need to configure security group rules and <span id="elb_faq_0090__en-us_topic_0052569751_ph3592063517">firewall</span> rules to allow traffic from 100.125.0.0/16<span id="elb_faq_0090__en-us_topic_0052569751_ph2236716134818"></span> and client IP addresses to backend servers.</li><li id="elb_faq_0090__en-us_topic_0052569751_li523691644811"><span id="elb_faq_0090__en-us_topic_0052569751_ph687514266355">Dedicated load balancer</span>: If <strong id="elb_faq_0090__en-us_topic_0052569751_b16338185211569">IP as a Backend</strong> is not enabled for a load balancer that has a TCP or UDP listener, there is no need to configure security group rules and <span id="elb_faq_0090__en-us_topic_0052569751_ph19572195414362">firewall</span> rules to allow traffic from the VPC where the load balancer works to the backend servers associated with TCP or UDP listener.</li></ul>
</li><li id="elb_faq_0090__li99008095116">Configure security groups, network ACLs, and OS and software security policies so that IP addresses of the clients can access these backend servers.<div class="note" id="elb_faq_0090__note9800635192119"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_faq_0090__p17774359172118">If you enable this function, a server cannot be used as both the client and the backend server. If the client and the backend server use the same server and the <strong id="elb_faq_0090__b1738818185">Transfer Client IP Address</strong> option is enabled, the backend server will think the packet from the client is sent by itself and will not return a response packet to the load balancer. As a result, the return traffic will be interrupted.</p>
</div></div>
<div class="p" id="elb_faq_0090__p3759133762118"><div class="note" id="elb_faq_0090__note9800635192119"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_faq_0090__p17774359172118">If you enable this function, a server cannot be used as both the client and the backend server. If the client and the backend server use the same server and the <strong id="elb_faq_0090__b735926965">Transfer Client IP Address</strong> option is enabled, the backend server will think the packet from the client is sent by itself and will not return a response packet to the load balancer. As a result, the return traffic will be interrupted.</p>
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<h1 class="topictitle1">Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from the Configured Interval?</h1>
<div id="body1574844301249"><p id="elb_faq_0092__p1294414571272">Each LVS node and Nginx node in the ELB system detect backend servers at the health check interval that you have specified for the backend server group.</p>
<p id="elb_faq_0092__p8060118">During this period, backend servers receive detection packets from multiple nodes. This makes it seem that backend servers receive these packets at intervals shorter than the specified health check interval.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0204.html">Health Checks</a></div>
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<h1 class="topictitle1">Which Protocol Should I Select for the Backend Server Group When Adding an HTTPS Listener?</h1>
<div id="body1574843372791"><p id="elb_faq_0110__p1136515819229">To use HTTPS at both the frontend and backend, you can create a dedicated load balancer, add an HTTPS listener to the load balancer, and set the backend protocol to HTTPS.</p>
<p id="elb_faq_0110__p01731216219">To use HTTPS at the frontend only, you can create a dedicated load balancer with HTTPS listener, and set the backend protocol to HTTP.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0180.html">HTTP/HTTPS Listeners</a></div>
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<h1 class="topictitle1">Why Is the Outgoing Rate on the ELB Console Inconsistent with the Bandwidth Usage Statistics on the Cloud Eye Console?</h1>
<div id="body1555913901702"><p id="elb_faq_0115__p1493514010472">In the following scenarios, outgoing rate monitored by ELB is inconsistent with EIP bandwidth usage statistics on Cloud Eye:</p>
<ul id="elb_faq_0115__ul486121935511"><li id="elb_faq_0115__li1886619185513">If the traffic does not exceed the bandwidth set for the EIP, the bandwidth is not limited and Cloud Eye collects statistics on the public network while ELB collects data on the private network.</li><li id="elb_faq_0115__li188791910559">If the traffic exceeds the bandwidth set for the EIP, the bandwidth is limited. Traffic to the ELB system passes through a path that is different from the path in which traffic passes to the EIP.</li></ul>
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<h1 class="topictitle1">Why Can I Access Backend Servers After a Whitelist Is Configured?</h1>
<div id="body1588062642982"><p id="elb_faq_0124__p14327152719345">The whitelist controls only access to a listener. Only IP addresses in the whitelist can access the listener. To control access to backend servers, you can configure <span id="elb_faq_0124__en-us_topic_0000001390784280_ph3292026172912">Firewall</span> or security group rules.</p>
<p id="elb_faq_0124__p8060118"></p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0203.html">Backend Servers</a></div>
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<h1 class="topictitle1">When Will Modified Weights Take Effect?</h1>
<div id="body1588062642982"><p id="elb_faq_0125__p966123218452">The new weights for backend servers take effect immediately after the weights are configured. Connections that have been established with backend servers will not be affected.</p>
<div class="note" id="elb_faq_0125__note195144217552"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_faq_0125__p695234265515">If the weight of a backend server is changed to 0, the new weight does not take effect immediately, and requests are still routed to this backend server. This is because a persistent connection is established between the load balancer and the backend server and requests are routed to this server until the connection times out.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0203.html">Backend Servers</a></div>
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<h1 class="topictitle1">What Are the Differences Between Persistent Connections and Sticky Sessions?</h1>
<div id="body1588062428635"><p id="elb_faq_0126__p166948440277">Persistent connections are not necessarily related to sticky sessions.</p>
<p id="elb_faq_0126__p7694194416271">A persistent connection allows multiple data packets to be sent continuously over a TCP connection. If no data packets are sent over the connection, the client and the server need to send link detection packets to each other. Sticky sessions enable all requests from the same client during one session to be sent to the same backend server.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0190.html">Sticky Sessions</a></div>
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<h1 class="topictitle1">Service Performance and Load</h1>
<div id="body1590575971687"><p id="elb_faq_0127__p8060118"></p>
</div>
<h1 class="topictitle1">Load Balancing Performance</h1>
<div id="body1590575971687"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0049.html">How Do I Check for Traffic Inconsistencies?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0050.html">How Do I Check If Traffic Is Being Evenly Distributed?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0047.html">How Do I Check If There Is Excessive Access Delay?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0052.html">What Do I Do If a Load Balancer Fails a Stress Test?</a></strong><br>
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<h1 class="topictitle1">Can ELB Be Used Across Accounts or VPCs?</h1>
<div id="body1590464381352"><ul id="elb_faq_0135__ul1875610623020"><li id="elb_faq_0135__li89051910123112">Your <span id="elb_faq_0135__ph660616083117">Shared</span> load balancers cannot be used by another account, and you cannot associate backend servers whose VPCs are not the same as the load balancers.</li><li id="elb_faq_0135__li17784848448">For <span id="elb_faq_0135__ph48931152183716">Dedicated load balancer</span>s, you can add servers in a VPC connected using a VPC peering connection, in a VPC in another region and connected through a cloud connection, or in an on-premises data center at the other end of a Direct Connect or VPN connection, by using their IP addresses. For details, see <a href="elb_ug_hd_0005.html">Configuring Hybrid Load Balancing</a>.</li></ul>
<div id="body1590464381352"><ul id="elb_faq_0135__ul1875610623020"><li id="elb_faq_0135__li89051910123112">Your <span id="elb_faq_0135__ph660616083117">Shared</span> load balancers cannot be used by another account, and you cannot associate backend servers whose VPCs are not the same as the load balancers.</li><li id="elb_faq_0135__li17784848448">For <span id="elb_faq_0135__ph48931152183716">Dedicated load balancer</span>s, you can add servers in a VPC connected using a VPC peering connection, in a VPC in another region and connected through a cloud connection, or in an on-premises data center at the other end of a Direct Connect or VPN connection, by using their IP addresses. For details, see section <a href="elb_ug_hd_0005.html">Configuring Hybrid Load Balancing</a> in <em id="elb_faq_0135__i22091139109">Elastic Load Balance User Guide</em>.</li></ul>
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<li class="ulchildlink"><strong><a href="elb_faq_0090.html">How Can I Transfer the IP Address of a Client?</a></strong><br>
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<li class="ulchildlink"><strong><a href="elb_faq_0171.html">How Can an EIP Bound to a Load Balancer Be Transmitted to Backend Servers?</a></strong><br>
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<a name="elb_faq_0171"></a><a name="elb_faq_0171"></a>
<h1 class="topictitle1">How Can an EIP Bound to a Load Balancer Be Transmitted to Backend Servers?</h1>
<div id="body1590575971687"><p id="elb_faq_0171__p1671194064214">When you add an HTTPS or HTTP listener, enable <strong id="elb_faq_0171__b853619484423">Transfer Load Balancer EIP</strong> to store the EIP bound to the load balancer in the HTTP header and transmit it to backend servers. For details, see <a href="en-us_topic_0118147668.html">Transferring the Load Balancer EIP to Backend Servers</a>.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0170.html">Obtaining Source IP Addresses</a></div>
</div>
</div>

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<h1 class="topictitle1">HTTP/HTTPS Listeners</h1>
<div id="body1590575971687"><p id="elb_faq_0180__p962411440229"></p>
</div>
<div id="body1590575971687"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0110.html">Which Protocol Should I Select for the Backend Server Group When Adding an HTTPS Listener?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0118.html">Why Is There a Security Warning After a Certificate Is Configured?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210804.html">Why Is a Forwarding Policy in the Faulty State?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210805.html">Why Can't I Add a Forwarding Policy to a Listener?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210806.html">Why Cannot I Select an Existing Backend Server Group When Adding a Forwarding Policy?</a></strong><br>
</li>
</ul>
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<h1 class="topictitle1">Sticky Sessions</h1>
<div id="body1590575971687"><p id="elb_faq_0190__p8060118"></p>
</div>
<div id="body1590575971687"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0126.html">What Are the Differences Between Persistent Connections and Sticky Sessions?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0046.html">How Do I Check If Sticky Sessions Failed to Take Effect?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0067.html">How Do I Test Sticky Sessions Using Linux Curl Commands?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0085.html">What Types of Sticky Sessions Does ELB Support?</a></strong><br>
</li>
</ul>

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<div id="body1575704958391"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0065.html">What Is Quota?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0038.html">How Does ELB Distribute Traffic?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0080.html">How Can I Access a Load Balancer Across VPCs?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210304.html">Why Can't I Delete My Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210305.html">Do I Need to Configure Bandwidth for My Load Balancers?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210306.html">Can I Bind Multiple EIPs to a Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210307.html">Why Multiple IP Addresses Are Required When I Create or Enable a Dedicated Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210308.html">Why Are Requests from the Same IP Address Routed to Different Backend Servers When the Load Balancing Algorithm Is Source IP Hash?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210309.html">Can Backend Servers Access the Internet Using the EIP of the Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210310.html">Do Shared Load Balancers Have Specifications?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210312.html">Will Traffic Routing Be Interrupted If the Load Balancing Algorithm Is Changed?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210313.html">What Is the Difference Between the Bandwidth Included in Each Specification of a Dedicated Load Balancer and the Bandwidth of an EIP?</a></strong><br>
</li>
</ul>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_05_0008.html">What Are the Relationships Between Load Balancing Algorithms and Sticky Session Types?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_05_0005.html">Can I Bind Multiple Certificates to a Listener?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0083.html">Will ELB Stop Distributing Traffic Immediately After a Listener Is Deleted?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0084.html">Does ELB Have Restrictions on the File Upload Speed and Size?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0075.html">Can Multiple Load Balancers Route Requests to One Backend Server?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0111.html">How Is WebSocket Used?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210409.html">Why Can't I Select the Target Backend Server Group When Adding or Modifying a Listener?</a></strong><br>

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</li>
<li class="ulchildlink"><strong><a href="elb_faq_0074.html">Can ELB Route Traffic Across Regions?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0077.html">Does Each Backend Server Need an EIP to Receive Requests from a Public Network Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0039.html">How Do I Check the Network Conditions of a Backend Server?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0040.html">How Can I Check the Network Configuration of a Backend Server?</a></strong><br>
@ -18,6 +20,10 @@
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0001.html">When Is a Backend Server Considered Healthy?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0124.html">Why Can I Access Backend Servers After a Whitelist Is Configured?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0125.html">When Will Modified Weights Take Effect?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0131.html">Why Must the Subnet Where the Load Balancer Resides Have at Least 16 Available IP Addresses for Enabling IP as a Backend?</a></strong><br>
</li>
</ul>

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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="en-us_topic_0018127975.html">How Do I Troubleshoot an Unhealthy Backend Server?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0092.html">Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from the Configured Interval?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0024.html">How Does ELB Perform UDP Health Checks? What Are the Precautions for UDP Health Checks?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0114.html">Why Does ELB Frequently Send Requests to Backend Servers During Health Checks?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0002.html">When Does a Health Check Start?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0003.html">Do Maximum Retries Include Health Checks That Consider Backend Servers Unhealthy?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0070.html">What Do I Do If a Lot of Access Logs Are Generated During Health Checks?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210608.html">What Status Codes Will Be Returned If Backend Servers Are Identified as Healthy?</a></strong><br>
</li>
</ul>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0072.html">How Can I Create Server Certificates and CA Certificates?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0073.html">Does ELB Support Wildcard Certificates?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_211003.html">Why Is Access to Backend Servers Still Abnormal Even If I Have Created a Certificate?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_211004.html">Will the Network or Load Balancing Be Interrupted When a Certificate Is Being Replaced?</a></strong><br>
</li>
</ul>
<div class="familylinks">

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<a name="elb_faq_0207"></a><a name="elb_faq_0207"></a>
<h1 class="topictitle1">Monitoring</h1>
<div id="body1575704958408"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0115.html">Why Is the Outgoing Rate on the ELB Console Inconsistent with the Bandwidth Usage Statistics on the Cloud Eye Console?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0081.html">What Are the Differences Between Layer-7 Status Codes and Backend Status Codes in ELB Metrics?</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0000.html">FAQ</a></div>
</div>
</div>

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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0060.html">Can ELB Be Used Separately?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0079.html">Does ELB Support Persistent Connections?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0057.html">Does ELB Support FTP on Backend Servers?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="en-us_elb_05_0011.html">Is an EIP Assigned Exclusively to a Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_05_0004.html">How Many Load Balancers and Listeners Can I Have?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0088.html">What Types of APIs Does ELB Provide? What Are Permissions of ELB?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0062.html">Can I Adjust the Number of Backend Servers When a Load Balancer is Running?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0064.html">Can Backend Servers Run Different OSs?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0059.html">Can I Configure Different Backend Ports for a Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0135.html">Can ELB Be Used Across Accounts or VPCs?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_21020218.html">Can Backend Servers Access the Ports of a Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_21020220.html">Can Both the Listener and Backend Server Group Use HTTPS?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_210202201.html">Can I Change the VPC and Subnet for My Load Balancer?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_21020221.html">Can I Upgrade a Shared Load Balancer to a Dedicated Load Balancer Without Interrupting Traffic Routing?</a></strong><br>
</li>
</ul>

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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0211.html">ELB Functionality</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="elb_faq_0127.html">Service Performance and Load</a></strong><br>
<li class="ulchildlink"><strong><a href="elb_faq_0127.html">Load Balancing Performance</a></strong><br>
</li>
</ul>

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<h1 class="topictitle1">How Many Load Balancers and Listeners Can I Have?</h1>
<div id="body1437669816816"><p id="elb_faq_05_0004__p634223815288">By default, an account can create up to 50 load balancers, including both <span id="elb_faq_05_0004__ph18691335092">shared</span> and dedicated load balancers and 100 listeners. If you need more load balancers or listeners, apply for higher quotas.</p>
<div id="body1437669816816"><p id="elb_faq_05_0004__p0642202212338">By default, each account can have up to 50 load balancers and 100 listeners. If you need more load balancers or listeners, apply to increase your quotas.</p>
<p id="elb_faq_05_0004__p156794518262">All load balancers in your account share the same quota for listeners.</p>
</div>
<div>

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<h1 class="topictitle1">Can I Bind Multiple Certificates to a Listener?</h1>
<div id="body1505960260438"><p id="elb_faq_05_0005__p1369949101014">You can configure multiple certificates for an HTTPS listener by enabling SNI so that different certificates can be used for authentication based on the domain names of the requests.</p>
<p id="elb_faq_05_0005__p1064415274216">For details, see <a href="elb_ug_jt_0021.html">SNI Certificate (for HTTPS Listeners)</a>.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0202.html">Listeners</a></div>
</div>
</div>

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</table>
</div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_faq_05_0008__table44808652142126" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Sticky sessions supported by <span id="elb_faq_05_0008__ph669718389418">shared</span> load balancers</caption><thead align="left"><tr id="elb_faq_05_0008__row57750719142126"><th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.3.2.5.1.1"><p id="elb_faq_05_0008__p56688074142142"><strong id="elb_faq_05_0008__b926173293">Load Balancing Algorithm</strong></p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_faq_05_0008__table44808652142126" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Sticky sessions supported by <span id="elb_faq_05_0008__ph669718389418">shared</span> load balancers</caption><thead align="left"><tr id="elb_faq_05_0008__row57750719142126"><th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.3.2.5.1.1"><p id="elb_faq_05_0008__p56688074142142"><strong id="elb_faq_05_0008__b1848222006">Load Balancing Algorithm</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="31.95%" id="mcps1.3.3.2.5.1.2"><p id="elb_faq_05_0008__p52415961142126">Sticky Session Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="20.68%" id="mcps1.3.3.2.5.1.3"><p id="elb_faq_05_0008__p4883497514222"><strong id="elb_faq_05_0008__b736028698">Layer 4 (TCP/UDP)</strong></p>
<th align="left" class="cellrowborder" valign="top" width="20.68%" id="mcps1.3.3.2.5.1.3"><p id="elb_faq_05_0008__p4883497514222"><strong id="elb_faq_05_0008__b1597668681">Layer 4 (TCP/UDP)</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="22.37%" id="mcps1.3.3.2.5.1.4"><p id="elb_faq_05_0008__p35305098142126"><strong id="elb_faq_05_0008__b1492038019">Layer 7 (HTTP/HTTPS)</strong></p>
<th align="left" class="cellrowborder" valign="top" width="22.37%" id="mcps1.3.3.2.5.1.4"><p id="elb_faq_05_0008__p35305098142126"><strong id="elb_faq_05_0008__b460242441">Layer 7 (HTTP/HTTPS)</strong></p>
</th>
</tr>
</thead>

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<h1 class="topictitle1">Can Backend Servers Access the Ports of a Load Balancer?</h1>
<div id="body0000001129298174"><p id="elb_faq_21020218__p8060118">No. Backend servers cannot access the ports of the load balancer they are associated with.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0211.html">ELB Functionality</a></div>
</div>
</div>

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<h1 class="topictitle1">Can Both the Listener and Backend Server Group Use HTTPS?</h1>
<div id="body0000001215185691"><p id="elb_faq_21020220__p8060118">Dedicated load balancers support this function.</p>
<p id="elb_faq_21020220__p128793500117">You can select HTTPS as the listener's and the backend server group's protocol. For details about how to add a listener, see section "Adding an HTTPS Listener" in the <em id="elb_faq_21020220__i926194717212">Elastic Load Balance User Guide</em>.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0211.html">ELB Functionality</a></div>
</div>
</div>

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<h1 class="topictitle1">Can I Change the VPC and Subnet for My Load Balancer?</h1>
<div id="body0000001239766097"><p id="elb_faq_210202201__p12192155443316">You cannot change the VPC and subnet for your <span id="elb_faq_210202201__ph84821558185815">Shared</span> load balancers.</p>
<p id="elb_faq_210202201__p194699943016">You can change the subnet but not the VPC for your dedicated load balancers.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_faq_0211.html">ELB Functionality</a></div>
</div>
</div>

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