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  10 <title>mod_heartmonitor - Apache HTTP Server Version 2.5</title>
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  21 <p class="apache">Apache HTTP Server Version 2.5</p>
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  25 <a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.5</a> &gt; <a href="./">Modules</a></div>
  26 <div id="page-content">
  27 <div id="preamble"><h1>Apache Module mod_heartmonitor</h1>
  28 <div class="toplang">
  29 <p><span>Available Languages: </span><a href="../en/mod/mod_heartmonitor.html" title="English">&nbsp;en&nbsp;</a> |
  30 <a href="../fr/mod/mod_heartmonitor.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
  31 </div>
  32 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Centralized monitor for mod_heartbeat origin servers</td></tr>
  33 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  34 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>heartmonitor_module</td></tr>
  35 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_heartmonitor.c</td></tr>
  36 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
  37 <h3>Summary</h3>
  38
  39 <p>
  40 <code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code> listens for server status messages generated
  41 by <code class="module"><a href="../mod/mod_heartbeat.html">mod_heartbeat</a></code> enabled origin servers and makes their status
  42 available to <code class="module"><a href="../mod/mod_lbmethod_heartbeat.html">mod_lbmethod_heartbeat</a></code>. This allows
  43 <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> to use the "heartbeat"
  44 <em>lbmethod</em> inside of <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>.
  45 </p>
  46
  47 <p>This module uses the services of <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> when
  48 available instead of flat-file storage.  No configuration is required to
  49 use <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code>.</p>
  50
  51     <div class="warning">
  52         To use <code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code>,
  53         <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>
  54         must be either a static modules or, if a dynamic module, it must
  55         be loaded before <code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code>.
  56     </div>
  57
  58 </div>
  59 <div id="quickview"><h3 class="directives">Directives</h3>
  60 <ul id="toc">
  61 <li><img alt="" src="../images/down.gif" /> <a href="#heartbeatlisten">HeartbeatListen</a></li>
  62 <li><img alt="" src="../images/down.gif" /> <a href="#heartbeatmaxservers">HeartbeatMaxServers</a></li>
  63 <li><img alt="" src="../images/down.gif" /> <a href="#heartbeatstorage">HeartbeatStorage</a></li>
  64 </ul>
  65 <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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_heartmonitor">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_heartmonitor">Report a bug</a></li></ul><h3>See also</h3>
  66 <ul class="seealso">
  67 <li><a href="#comments_section">Comments</a></li></ul></div>
  68
  69 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  70 <div class="directive-section"><h2><a name="HeartbeatListen" id="HeartbeatListen">HeartbeatListen</a> <a name="heartbeatlisten" id="heartbeatlisten">Directive</a></h2>
  71 <table class="directive">
  72 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>multicast address to listen for incoming heartbeat requests </td></tr>
  73 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatListen<var>addr:port</var></code></td></tr>
  74 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>disabled</code></td></tr>
  75 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
  76 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  77 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
  78 </table>
  79     <p>The <code class="directive">HeartbeatListen</code> directive specifies the
  80     multicast address on which the server will listen for status information from
  81     <code class="module"><a href="../mod/mod_heartbeat.html">mod_heartbeat</a></code>-enabled servers.  This
  82     address will usually correspond to a configured  <code class="directive"><a href="../mod/mod_heartbeat.html#heartbeataddress">HeartbeatAddress</a></code> on an origin server.
  83     </p>
  84
  85     <pre class="prettyprint lang-config">HeartbeatListen 239.0.0.1:27999</pre>
  86
  87
  88     <p> This module is inactive until this directive is used.</p>
  89
  90 </div>
  91 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  92 <div class="directive-section"><h2><a name="HeartbeatMaxServers" id="HeartbeatMaxServers">HeartbeatMaxServers</a> <a name="heartbeatmaxservers" id="heartbeatmaxservers">Directive</a></h2>
  93 <table class="directive">
  94 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specifies the maximum number of servers that will be sending
  95 heartbeat requests to this server</td></tr>
  96 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatMaxServers <var>number-of-servers</var></code></td></tr>
  97 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>HeartbeatMaxServers 10</code></td></tr>
  98 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
  99 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 100 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
 101 </table>
 102     <p>The <code class="directive">HeartbeatMaxServers</code> directive specifies the
 103     maximum number of servers that will be sending requests to this monitor
 104     server.  It is used to control the size of the shared memory allocated
 105     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>
 106
 107 </div>
 108 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 109 <div class="directive-section"><h2><a name="HeartbeatStorage" id="HeartbeatStorage">HeartbeatStorage</a> <a name="heartbeatstorage" id="heartbeatstorage">Directive</a></h2>
 110 <table class="directive">
 111 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Path to store heartbeat data</td></tr>
 112 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatStorage <var>file-path</var></code></td></tr>
 113 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>HeartbeatStorage logs/hb.dat</code></td></tr>
 114 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
 115 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 116 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
 117 </table>
 118     <p>The <code class="directive">HeartbeatStorage</code> directive specifies the
 119     path to store heartbeat data.  This flat-file is used only when
 120     <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> is not loaded.</p>
 121
 122 </div>
 123 </div>
 124 <div class="bottomlang">
 125 <p><span>Available Languages: </span><a href="../en/mod/mod_heartmonitor.html" title="English">&nbsp;en&nbsp;</a> |
 126 <a href="../fr/mod/mod_heartmonitor.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
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