doc-exports/docs/elb/umn/elb_pro_0019.html
zhoumeng 3275979377 ELB_UMN_IPV6_1218
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>
2024-02-09 10:31:35 +00:00

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<h1 class="topictitle1">Quotas and Constraints</h1>
<div id="body0000001597678400"><p id="elb_pro_0019__p188069186715">You can create dedicated and shared load balancers on ELB console. This section describes the quotas and restrictions that apply to ELB resources.</p>
<div class="section" id="elb_pro_0019__section9752507451"><a name="elb_pro_0019__section9752507451"></a><a name="section9752507451"></a><h4 class="sectiontitle">ELB Resource Quotas</h4><p id="elb_pro_0019__en-us_topic_0040259342_p1415804616467">Quotas put limits on the number or amount of resources, such as the maximum number of ECSs or EVS disks that you can create.</p>
<p id="elb_pro_0019__p19779201182812"><a href="#elb_pro_0019__table834515142196">Table 1</a> lists the default quotas of ELB resources. You can view your quotas by referring to <a href="elb_ug_pe_0000.html">Quotas</a>.</p>
<p id="elb_pro_0019__en-us_topic_0040259342_p547171214515">If the existing resource quota cannot meet your service requirements, you can request an increase to adjust quotas by referring to <a href="elb_ug_pe_0000.html">Quotas</a>.</p>
<div class="tablenoborder"><a name="elb_pro_0019__table834515142196"></a><a name="table834515142196"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_pro_0019__table834515142196" frame="border" border="1" rules="all"><caption><b>Table 1 </b>ELB resource quotas</caption><thead align="left"><tr id="elb_pro_0019__row3346191441915"><th align="left" class="cellrowborder" valign="top" width="31.04%" id="mcps1.3.2.5.2.4.1.1"><p id="elb_pro_0019__p63651217152812">Resource</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="44.04%" id="mcps1.3.2.5.2.4.1.2"><p id="elb_pro_0019__p271221633712">Description</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="24.92%" id="mcps1.3.2.5.2.4.1.3"><p id="elb_pro_0019__p16346111471913">Default Quota</p>
</th>
</tr>
</thead>
<tbody><tr id="elb_pro_0019__row1634617143192"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.2.5.2.4.1.1 "><p id="elb_pro_0019__p4346181431915">Load balancers</p>
</td>
<td class="cellrowborder" valign="top" width="44.04%" headers="mcps1.3.2.5.2.4.1.2 "><p id="elb_pro_0019__p15712181683717">Load balancers per account</p>
</td>
<td class="cellrowborder" valign="top" width="24.92%" headers="mcps1.3.2.5.2.4.1.3 "><p id="elb_pro_0019__p53462149194">50</p>
</td>
</tr>
<tr id="elb_pro_0019__row4346314161911"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.2.5.2.4.1.1 "><p id="elb_pro_0019__p3346714181918">Listeners</p>
</td>
<td class="cellrowborder" valign="top" width="44.04%" headers="mcps1.3.2.5.2.4.1.2 "><p id="elb_pro_0019__p20521443173814">Listeners per account</p>
</td>
<td class="cellrowborder" valign="top" width="24.92%" headers="mcps1.3.2.5.2.4.1.3 "><p id="elb_pro_0019__p1634611146197">100</p>
</td>
</tr>
<tr id="elb_pro_0019__row1334611142197"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.2.5.2.4.1.1 "><p id="elb_pro_0019__p73461514181913">Forwarding policies</p>
</td>
<td class="cellrowborder" valign="top" width="44.04%" headers="mcps1.3.2.5.2.4.1.2 "><p id="elb_pro_0019__p186261526163918">Forwarding policies per account</p>
</td>
<td class="cellrowborder" valign="top" width="24.92%" headers="mcps1.3.2.5.2.4.1.3 "><p id="elb_pro_0019__p13346131411912">500</p>
</td>
</tr>
<tr id="elb_pro_0019__row1976043217249"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.2.5.2.4.1.1 "><p id="elb_pro_0019__p7163136112517">Backend server groups</p>
</td>
<td class="cellrowborder" valign="top" width="44.04%" headers="mcps1.3.2.5.2.4.1.2 "><p id="elb_pro_0019__p548304318394">Backend server groups per account</p>
</td>
<td class="cellrowborder" valign="top" width="24.92%" headers="mcps1.3.2.5.2.4.1.3 "><p id="elb_pro_0019__p37611132102414">500</p>
</td>
</tr>
<tr id="elb_pro_0019__row18786927317"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.2.5.2.4.1.1 "><p id="elb_pro_0019__p17791516320">Certificates</p>
</td>
<td class="cellrowborder" valign="top" width="44.04%" headers="mcps1.3.2.5.2.4.1.2 "><p id="elb_pro_0019__p1777919511315">Certificates per account</p>
</td>
<td class="cellrowborder" valign="top" width="24.92%" headers="mcps1.3.2.5.2.4.1.3 "><p id="elb_pro_0019__p37792051138">120</p>
</td>
</tr>
<tr id="elb_pro_0019__row47071359246"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.2.5.2.4.1.1 "><p id="elb_pro_0019__p1988510318251">Backend servers</p>
</td>
<td class="cellrowborder" valign="top" width="44.04%" headers="mcps1.3.2.5.2.4.1.2 "><p id="elb_pro_0019__p061878204012">Backend servers per account</p>
</td>
<td class="cellrowborder" valign="top" width="24.92%" headers="mcps1.3.2.5.2.4.1.3 "><p id="elb_pro_0019__p10707163518249">500</p>
</td>
</tr>
<tr id="elb_pro_0019__row32861040182416"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.2.5.2.4.1.1 "><p id="elb_pro_0019__p14286040122410">Listeners per load balancer</p>
</td>
<td class="cellrowborder" valign="top" width="44.04%" headers="mcps1.3.2.5.2.4.1.2 "><p id="elb_pro_0019__p171211653713">Listeners that can be added to a load balancer</p>
</td>
<td class="cellrowborder" valign="top" width="24.92%" headers="mcps1.3.2.5.2.4.1.3 "><p id="elb_pro_0019__p15286124002419">50</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="note" id="elb_pro_0019__note8300128086"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_pro_0019__p860019211689">The quotas apply to a single account.</p>
</div></div>
</div>
<div class="section" id="elb_pro_0019__section974431513493"><h4 class="sectiontitle">Other Quotas</h4><p id="elb_pro_0019__p917016311751">In addition to quotas described in <a href="#elb_pro_0019__section9752507451">ELB Resource Quotas</a>, some other resources that you can use are also limited.</p>
<p id="elb_pro_0019__p6381192574410">You can call APIs to query quotas of the resources described in <a href="#elb_pro_0019__table1912621162511">Table 2</a> by referring to the "Querying Quotas" section in <em id="elb_pro_0019__i2913512289">Elastic Load Balance API Reference</em>.</p>
<div class="tablenoborder"><a name="elb_pro_0019__table1912621162511"></a><a name="table1912621162511"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_pro_0019__table1912621162511" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Other quotas</caption><thead align="left"><tr id="elb_pro_0019__row131263120257"><th align="left" class="cellrowborder" valign="top" width="31.04%" id="mcps1.3.3.4.2.4.1.1"><p id="elb_pro_0019__p1112615118252">Resource</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="44.01%" id="mcps1.3.3.4.2.4.1.2"><p id="elb_pro_0019__p61275112259">Description</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="24.95%" id="mcps1.3.3.4.2.4.1.3"><p id="elb_pro_0019__p171277112252">Default Quota</p>
</th>
</tr>
</thead>
<tbody><tr id="elb_pro_0019__row51278115259"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.3.4.2.4.1.1 "><p id="elb_pro_0019__p7127141182511">Forwarding rules per forwarding policy</p>
</td>
<td class="cellrowborder" valign="top" width="44.01%" headers="mcps1.3.3.4.2.4.1.2 "><p id="elb_pro_0019__p31272120252">Forwarding rules that can be added to a forwarding policy</p>
</td>
<td class="cellrowborder" valign="top" width="24.95%" headers="mcps1.3.3.4.2.4.1.3 "><p id="elb_pro_0019__p191275172512">10</p>
</td>
</tr>
<tr id="elb_pro_0019__row712711122515"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.3.4.2.4.1.1 "><p id="elb_pro_0019__p212771182511">Backend servers per backend server group </p>
</td>
<td class="cellrowborder" valign="top" width="44.01%" headers="mcps1.3.3.4.2.4.1.2 "><p id="elb_pro_0019__p912781132517">Backend servers that can be added to a backend server group</p>
</td>
<td class="cellrowborder" valign="top" width="24.95%" headers="mcps1.3.3.4.2.4.1.3 "><p id="elb_pro_0019__p201274114257">500</p>
</td>
</tr>
<tr id="elb_pro_0019__row757410213454"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.3.4.2.4.1.1 "><p id="elb_pro_0019__p119212547452">IP address groups per load balancer</p>
</td>
<td class="cellrowborder" valign="top" width="44.01%" headers="mcps1.3.3.4.2.4.1.2 "><p id="elb_pro_0019__p13928547452">IP address groups per account</p>
</td>
<td class="cellrowborder" valign="top" width="24.95%" headers="mcps1.3.3.4.2.4.1.3 "><p id="elb_pro_0019__p16921254174516">50</p>
</td>
</tr>
<tr id="elb_pro_0019__row1883222315453"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.3.4.2.4.1.1 "><p id="elb_pro_0019__p169235464512">Listeners per IP address group</p>
</td>
<td class="cellrowborder" valign="top" width="44.01%" headers="mcps1.3.3.4.2.4.1.2 "><p id="elb_pro_0019__p199225484516">Listeners that can be associated with an IP address group</p>
</td>
<td class="cellrowborder" valign="top" width="24.95%" headers="mcps1.3.3.4.2.4.1.3 "><p id="elb_pro_0019__p1392195434513">50</p>
</td>
</tr>
<tr id="elb_pro_0019__row1794084610451"><td class="cellrowborder" valign="top" width="31.04%" headers="mcps1.3.3.4.2.4.1.1 "><p id="elb_pro_0019__p17929549451">IP addresses per IP address group</p>
</td>
<td class="cellrowborder" valign="top" width="44.01%" headers="mcps1.3.3.4.2.4.1.2 "><p id="elb_pro_0019__p49212549458">IP addresses that can be added to an IP address group</p>
</td>
<td class="cellrowborder" valign="top" width="24.95%" headers="mcps1.3.3.4.2.4.1.3 "><p id="elb_pro_0019__p12922054134520">300</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="elb_pro_0019__section19169172561715"><h4 class="sectiontitle">Load Balancer</h4><ul id="elb_pro_0019__ul8736123818018"><li id="elb_pro_0019__li27365381409">Before creating a load balancer, you must plan its region, type, protocol, and backend servers. For details, see <a href="elb_ug_fz_0004.html">Preparations for Creating a Load Balancer</a>.</li><li id="elb_pro_0019__li8736538502">The size of files that a load balancer can forward:<ul id="elb_pro_0019__ul4784840604"><li id="elb_pro_0019__li77361338607">Layer 4 listeners: any</li><li id="elb_pro_0019__li18901959801">Layer 7 listeners: 10 GB or smaller</li></ul>
</li></ul>
</div>
<div class="section" id="elb_pro_0019__section12750172124616"><h4 class="sectiontitle">Listener</h4><ul id="elb_pro_0019__ul1581116208321"><li id="elb_pro_0019__li6811142093217">The listener of a dedicated load balancer can be associated with a maximum of 50 backend server groups.</li><li id="elb_pro_0019__li253518375510">An HTTPS listener can have up to 30 SNI certificates.</li><li id="elb_pro_0019__li934684134210">Once set, the frontend protocol and port of the listener cannot be modified.</li></ul>
</div>
<div class="section" id="elb_pro_0019__section181541414713"><h4 class="sectiontitle">Forwarding Policy</h4><ul id="elb_pro_0019__ul164116261716"><li id="elb_pro_0019__li126411226877">Forwarding policies can be configured only for HTTP and HTTPS listeners.</li><li id="elb_pro_0019__li1164192612716">Forwarding policies must be unique.</li><li id="elb_pro_0019__li1064113261179">A maximum of 100 forwarding policies can be configured for a listener. If the number of forwarding policies exceeds the quota, the excess forwarding policies will not be applied.</li><li id="elb_pro_0019__li56418263713">Forwarding conditions:<ul id="elb_pro_0019__ul157286284710"><li id="elb_pro_0019__li66415262073">If the advanced forwarding policy is not enabled, each forwarding rule has only one forwarding condition.</li><li id="elb_pro_0019__li17995851387">If the advanced forwarding policy is enabled, each forwarding rule has up to 10 forwarding conditions.</li></ul>
</li></ul>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_pro_0019__table14871141811564" frame="border" border="1" rules="all"><caption><b>Table 3 </b>Restrictions on forwarding policies</caption><thead align="left"><tr id="elb_pro_0019__row3872418195611"><th align="left" class="cellrowborder" valign="top" width="16.186556927297666%" id="mcps1.3.6.3.2.5.1.1"><p id="elb_pro_0019__p0872161814569">Load Balancer Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="15.213867065718917%" id="mcps1.3.6.3.2.5.1.2"><p id="elb_pro_0019__p1587281875611">Advanced Forwarding</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="33.108866442199776%" id="mcps1.3.6.3.2.5.1.3"><p id="elb_pro_0019__p887231816567">Forwarding Rule</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="35.49070956478364%" id="mcps1.3.6.3.2.5.1.4"><p id="elb_pro_0019__p158491992004">Action</p>
</th>
</tr>
</thead>
<tbody><tr id="elb_pro_0019__row1987251815564"><td class="cellrowborder" valign="top" width="16.186556927297666%" headers="mcps1.3.6.3.2.5.1.1 "><p id="elb_pro_0019__p15872918195610">Shared</p>
</td>
<td class="cellrowborder" valign="top" width="15.213867065718917%" headers="mcps1.3.6.3.2.5.1.2 "><p id="elb_pro_0019__p85785215102">Not supported</p>
</td>
<td class="cellrowborder" valign="top" width="33.108866442199776%" headers="mcps1.3.6.3.2.5.1.3 "><p id="elb_pro_0019__p379523131819">Domain name and URL</p>
</td>
<td class="cellrowborder" valign="top" width="35.49070956478364%" headers="mcps1.3.6.3.2.5.1.4 "><p id="elb_pro_0019__p6849591608"><strong id="elb_pro_0019__b537813575511">Forward to another backend server group</strong> and <strong id="elb_pro_0019__b237817585519">Redirect to another listener</strong></p>
</td>
</tr>
<tr id="elb_pro_0019__row20872218105612"><td class="cellrowborder" rowspan="2" valign="top" width="16.186556927297666%" headers="mcps1.3.6.3.2.5.1.1 "><p id="elb_pro_0019__p787211825616">Dedicated</p>
</td>
<td class="cellrowborder" valign="top" width="15.213867065718917%" headers="mcps1.3.6.3.2.5.1.2 "><p id="elb_pro_0019__p10872191819567">Disabled</p>
</td>
<td class="cellrowborder" valign="top" width="33.108866442199776%" headers="mcps1.3.6.3.2.5.1.3 "><p id="elb_pro_0019__p19247122502013">Domain name and URL</p>
</td>
<td class="cellrowborder" valign="top" width="35.49070956478364%" headers="mcps1.3.6.3.2.5.1.4 "><p id="elb_pro_0019__p11923628102014"><strong id="elb_pro_0019__b18351612145615">Forward to another backend server group</strong> and <strong id="elb_pro_0019__b1836171218560">Redirect to another listener</strong></p>
</td>
</tr>
<tr id="elb_pro_0019__row16872718175617"><td class="cellrowborder" valign="top" headers="mcps1.3.6.3.2.5.1.1 "><p id="elb_pro_0019__p138726184569">Enabled</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.6.3.2.5.1.2 "><p id="elb_pro_0019__p208722186569">Domain name, URL, HTTP request method, HTTP header, query string, and CIDR block</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.6.3.2.5.1.3 "><p id="elb_pro_0019__p3229101920497"><strong id="elb_pro_0019__b41028377210">Forward to a backend server group</strong>, <strong id="elb_pro_0019__b1145454014217">Redirect to another listener</strong>, <strong id="elb_pro_0019__b17850543420">Redirect to another URL</strong>, and <strong id="elb_pro_0019__b1418916501521">Return a specific response body</strong></p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="elb_pro_0019__section287433444616"><h4 class="sectiontitle">Backend Server Group</h4><p id="elb_pro_0019__p280194613537">The backend protocol of the backend server group must match the frontend protocol of the listener as described in <a href="#elb_pro_0019__table41881780511">Table 4</a>.</p>
<div class="tablenoborder"><a name="elb_pro_0019__table41881780511"></a><a name="table41881780511"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_pro_0019__table41881780511" frame="border" border="1" rules="all"><caption><b>Table 4 </b>The frontend and backend protocols</caption><thead align="left"><tr id="elb_pro_0019__en-us_topic_0000001464593065_row119265494510"><th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.7.3.2.3.1.1"><p id="elb_pro_0019__en-us_topic_0000001464593065_p13926184912517">Frontend Protocol</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.7.3.2.3.1.2"><p id="elb_pro_0019__en-us_topic_0000001464593065_p492664915519">Backend Protocol</p>
</th>
</tr>
</thead>
<tbody><tr id="elb_pro_0019__en-us_topic_0000001464593065_row1592612491059"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.7.3.2.3.1.1 "><p id="elb_pro_0019__en-us_topic_0000001464593065_p119263491651">TCP</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.7.3.2.3.1.2 "><p id="elb_pro_0019__en-us_topic_0000001464593065_p7171471262">TCP</p>
</td>
</tr>
<tr id="elb_pro_0019__en-us_topic_0000001464593065_row992644919511"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.7.3.2.3.1.1 "><p id="elb_pro_0019__en-us_topic_0000001464593065_p109261549951">UDP</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.7.3.2.3.1.2 "><ul id="elb_pro_0019__en-us_topic_0000001464593065_ul37386139711"><li id="elb_pro_0019__en-us_topic_0000001464593065_li77382130712">UDP</li><li id="elb_pro_0019__en-us_topic_0000001464593065_li19259735676">QUIC</li></ul>
</td>
</tr>
<tr id="elb_pro_0019__en-us_topic_0000001464593065_row1726016496713"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.7.3.2.3.1.1 "><p id="elb_pro_0019__en-us_topic_0000001464593065_p326012493720">HTTP</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.7.3.2.3.1.2 "><p id="elb_pro_0019__en-us_topic_0000001464593065_p112213291981">HTTP</p>
</td>
</tr>
<tr id="elb_pro_0019__en-us_topic_0000001464593065_row713413321185"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.7.3.2.3.1.1 "><p id="elb_pro_0019__en-us_topic_0000001464593065_p121342321388">HTTPS</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.7.3.2.3.1.2 "><ul id="elb_pro_0019__en-us_topic_0000001464593065_ul929715512815"><li id="elb_pro_0019__en-us_topic_0000001464593065_li1129718551781">HTTP</li><li id="elb_pro_0019__en-us_topic_0000001464593065_li321395719819">HTTPS</li></ul>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="elb_pro_0019__section88393541859"><h4 class="sectiontitle">Backend Server</h4><p id="elb_pro_0019__p172516313468">If <strong id="elb_pro_0019__b498136663">Transfer Client IP Address</strong> is enabled, a server cannot serve as both a backend server and a client.</p>
</div>
<div class="section" id="elb_pro_0019__section1665817373347"><h4 class="sectiontitle">TLS Security Policy</h4><p id="elb_pro_0019__p2608194363417">You can create a maximum of 50 TLS security policies.</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="elb_pro_0000.html">Service Overview</a></div>
</div>
</div>