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<div id="preamble"><h1>Apache Module mod_proxy_balancer</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_balancer.html" title="English"> en </a> |
+<a href="../fr/mod/mod_proxy_balancer.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
<a href="../ja/mod/mod_proxy_balancer.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> extension for load balancing </td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_balancer_module</td></tr>
-<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_balancer.c</td></tr>
-<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.1 and later</td></tr></table>
+<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_balancer.c</td></tr></table>
<h3>Summary</h3>
- <p>This module <em>requires</em> the service of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>. It provides load balancing support for
- <code>HTTP</code>, <code>FTP</code> and <code>AJP13</code> protocols
- </p>
-
- <p>Load balancing scheduler algorithm is provided by not this
- module but other modules such as:
- <code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code>,
- <code class="module"><a href="../mod/mod_lbmethod_bytraffic.html">mod_lbmethod_bytraffic</a></code> and
- <code class="module"><a href="../mod/mod_lbmethod_bybusyness.html">mod_lbmethod_bybusyness</a></code>.
- </p>
+ <p>This module <em>requires</em> the service of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and it provides load balancing for
+ all the supported protocols. The most important ones are:</p>
+ <ul>
+ <li>HTTP, using <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code></li>
+ <li>FTP, using <code class="module"><a href="../mod/mod_proxy_ftp.html">mod_proxy_ftp</a></code></li>
+ <li>AJP13, using <code class="module"><a href="../mod/mod_proxy_ajp.html">mod_proxy_ajp</a></code></li>
+ <li>WebSocket, using <code class="module"><a href="../mod/mod_proxy_wstunnel.html">mod_proxy_wstunnel</a></code></li>
+ </ul>
+
+ <p>The Load balancing scheduler algorithm is not provided by this
+ module but from other ones such as:</p>
+ <ul>
+ <li><code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code></li>
+ <li><code class="module"><a href="../mod/mod_lbmethod_bytraffic.html">mod_lbmethod_bytraffic</a></code></li>
+ <li><code class="module"><a href="../mod/mod_lbmethod_bybusyness.html">mod_lbmethod_bybusyness</a></code></li>
+ <li><code class="module"><a href="../mod/mod_lbmethod_heartbeat.html">mod_lbmethod_heartbeat</a></code></li>
+ </ul>
<p>Thus, in order to get the ability of load balancing,
<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>
large.</p>
</div>
</div>
-<div id="quickview"><h3 class="directives">Directives</h3>
-<p>This module provides no
- directives.</p>
-<h3>Topics</h3>
+<div id="quickview"><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#scheduler">Load balancer scheduler algorithm</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#stickyness">Load balancer stickyness</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#balancer_manager">Enabling Balancer Manager Support</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#stickyness_implementation">Details on load balancer stickyness</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#stickyness_troubleshooting">Troubleshooting load balancer stickyness</a></li>
-</ul><h3>See also</h3>
+</ul><h3 class="directives">Directives</h3>
+<p>This module provides no
+ directives.</p>
+<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_proxy_balancer">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_proxy_balancer">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
-</ul></div>
+<li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="scheduler" id="scheduler">Load balancer scheduler algorithm</a></h2>
load balancing between two back-end servers:
</p>
- <div class="example"><p><code>
- <Proxy balancer://mycluster><br />
- BalancerMember http://192.168.1.50:80<br />
- BalancerMember http://192.168.1.51:80<br />
- </Proxy><br />
- ProxyPass /test balancer://mycluster<br />
- ProxyPassReverse /test balancer://mycluster
- </code></p></div>
+ <pre class="prettyprint lang-config"><Proxy balancer://mycluster>
+ BalancerMember http://192.168.1.50:80
+ BalancerMember http://192.168.1.51:80
+</Proxy>
+ProxyPass "/test" "balancer://mycluster"
+ProxyPassReverse "/test" "balancer://mycluster"</pre>
+
<p>Another example of how to provide load balancing with stickyness
using <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>, even if the back-end server does
not set a suitable session cookie:
</p>
- <div class="example"><p><code>
- Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/"
- env=BALANCER_ROUTE_CHANGED<br />
- <Proxy balancer://mycluster><br />
- BalancerMember http://192.168.1.50:80 route=1<br />
- BalancerMember http://192.168.1.51:80 route=2<br />
- ProxySet stickysession=ROUTEID<br />
- </Proxy><br />
- ProxyPass /test balancer://mycluster<br />
- ProxyPassReverse /test balancer://mycluster
- </code></p></div>
+ <pre class="prettyprint lang-config">Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED
+<Proxy balancer://mycluster>
+ BalancerMember http://192.168.1.50:80 route=1
+ BalancerMember http://192.168.1.51:80 route=2
+ ProxySet stickysession=ROUTEID
+</Proxy>
+ProxyPass "/test" "balancer://mycluster"
+ProxyPassReverse "/test" "balancer://mycluster"</pre>
+
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<div class="section">
<h2><a name="environment" id="environment">Exported Environment Variables</a></h2>
<code class="module"><a href="../mod/mod_status.html">mod_status</a></code>.
Balancer manager enables dynamic update of balancer
members. You can use balancer manager to change the balance
- factor or a particular member, or put it in the off line
+ factor of a particular member, or put it in the off line
mode.
</p>
<p>To enable load balancer management for browsers from the example.com
domain add this code to your <code>httpd.conf</code>
configuration file</p>
-<div class="example"><p><code>
- <Location /balancer-manager><br />
- SetHandler balancer-manager<br />
-<br />
- Require host example.com<br />
- </Location>
-</code></p></div>
+<pre class="prettyprint lang-config"><Location "/balancer-manager">
+ SetHandler balancer-manager
+ Require host example.com
+</Location></pre>
+
<p>You can now access load balancer manager by using a Web browser
to access the page
- <code>http://your.server.name/balancer-manager</code></p>
+ <code>http://your.server.name/balancer-manager</code>. Please note
+ that only Balancers defined outside of <code><Location ...></code>
+ containers can be dynamically controlled by the Manager.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="stickyness_implementation" id="stickyness_implementation">Details on load balancer stickyness</a></h2>
<p>Finally you can support cookies and URL encoding at the same time, by
configuring the name of the cookie and the name of the URL parameter
separated by a vertical bar (<code>|</code>) as in the following example:</p>
- <div class="example"><p><code>
- ProxyPass /test balancer://mycluster stickysession=JSESSIONID|jsessionid scolonpathdelim=On<br />
- <Proxy balancer://mycluster><br />
- BalancerMember http://192.168.1.50:80 route=node1<br />
- BalancerMember http://192.168.1.51:80 route=node2<br />
- </Proxy><br />
- </code></p></div>
+ <pre class="prettyprint lang-config">ProxyPass "/test" "balancer://mycluster" stickysession=JSESSIONID|jsessionid scolonpathdelim=On
+<Proxy balancer://mycluster>
+ BalancerMember http://192.168.1.50:80 route=node1
+ BalancerMember http://192.168.1.51:80 route=node2
+</Proxy></pre>
+
<p>If the cookie and the request parameter both provide routing information
for the same request, the information from the request parameter is used.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="stickyness_troubleshooting" id="stickyness_troubleshooting">Troubleshooting load balancer stickyness</a></h2>
- <p>If you experience stickyness errors, e.g. users loose their
+ <p>If you experience stickyness errors, e.g. users lose their
application sessions and need to login again, you first want to
check whether this is because the back-ends are sometimes unavailable
or whether your configuration is wrong. To find out about possible
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