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-<p class="apache">Apache HTTP Server Version 2.3</p>
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+<p class="apache">Apache HTTP Server Version 2.5</p>
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3</a> > <a href="./">Modules</a></div>
+<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.
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<div id="preamble"><h1>Apache Module mod_heartmonitor</h1>
<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_heartmonitor.html" title="English"> en </a></p>
+<p><span>Available Languages: </span><a href="../en/mod/mod_heartmonitor.html" title="English"> en </a> |
+<a href="../fr/mod/mod_heartmonitor.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
</div>
-<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td /></tr>
-<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Centralized monitor for mod_heartbeat origin servers</td></tr>
+<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>heartmonitor_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_heartmonitor.c</td></tr>
-<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in 2.3 and later</td></tr></table>
+<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
<h3>Summary</h3>
- <div class="note">This document is still under development.</div>
+<p>
+<code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code> listens for server status messages generated
+by <code class="module"><a href="../mod/mod_heartbeat.html">mod_heartbeat</a></code> enabled origin servers and makes their status
+available to <code class="module"><a href="../mod/mod_lbmethod_heartbeat.html">mod_lbmethod_heartbeat</a></code>. This allows
+<code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> to use the "heartbeat"
+<em>lbmethod</em> inside of <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>.
+</p>
+
+<p>This module uses the services of <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> when
+available instead of flat-file storage. No configuration is required to
+use <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code>.</p>
+
+ <div class="warning">
+ To use <code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code>,
+ <code class="module"><a href="../mod/mod_status.html">mod_status</a></code> and <code class="module"><a href="../mod/mod_watchdog.html">mod_watchdog</a></code>
+ must be either a static modules or, if a dynamic module, it must
+ be loaded before <code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code>.
+ </div>
+
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#heartbeatlisten">HeartbeatListen</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#heartbeatmaxservers">HeartbeatMaxServers</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#heartbeatstorage">HeartbeatStorage</a></li>
</ul>
-</div>
+<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_heartmonitor">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_heartmonitor">Report a bug</a></li></ul><h3>See also</h3>
+<ul class="seealso">
+<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="directive-section"><h2><a name="HeartbeatListen" id="HeartbeatListen">HeartbeatListen</a> <a name="heartbeatlisten" id="heartbeatlisten">Directive</a></h2>
<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Address to listen for heartbeat requests</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code /></td></tr>
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>multicast address to listen for incoming heartbeat requests </td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatListen<var>addr:port</var></code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>disabled</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
+</table>
+ <p>The <code class="directive">HeartbeatListen</code> directive specifies the
+ multicast address on which the server will listen for status information from
+ <code class="module"><a href="../mod/mod_heartbeat.html">mod_heartbeat</a></code>-enabled servers. This
+ address will usually correspond to a configured <code class="directive"><a href="../mod/mod_heartbeat.html#heartbeataddress">HeartbeatAddress</a></code> on an origin server.
+ </p>
+
+ <pre class="prettyprint lang-config">HeartbeatListen 239.0.0.1:27999</pre>
+
+
+ <p> This module is inactive until this directive is used.</p>
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="HeartbeatMaxServers" id="HeartbeatMaxServers">HeartbeatMaxServers</a> <a name="heartbeatmaxservers" id="heartbeatmaxservers">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specifies the maximum number of servers that will be sending
+heartbeat requests to this server</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatMaxServers <var>number-of-servers</var></code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>HeartbeatMaxServers 10</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
</table>
- <div class="note">This document is still under development.</div>
+ <p>The <code class="directive">HeartbeatMaxServers</code> directive specifies the
+ maximum number of servers that will be sending requests to this monitor
+ server. It is used to control the size of the shared memory allocated
+ to store the heartbeat info when <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> is in use.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatStorage <var>file-path</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>HeartbeatStorage logs/hb.dat</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
</table>
- <div class="note">This document is still under development.</div>
+ <p>The <code class="directive">HeartbeatStorage</code> directive specifies the
+ path to store heartbeat data. This flat-file is used only when
+ <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> is not loaded.</p>
</div>
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-<p><span>Available Languages: </span><a href="../en/mod/mod_heartmonitor.html" title="English"> en </a></p>
-</div><div id="footer">
-<p class="apache">Copyright 2008 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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+<p><span>Available Languages: </span><a href="../en/mod/mod_heartmonitor.html" title="English"> en </a> |
+<a href="../fr/mod/mod_heartmonitor.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
+</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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