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   8 <title>mod_heartmonitor - Apache HTTP Server</title>
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  23 <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>
  24 <div id="page-content">
  25 <div id="preamble"><h1>Apache Module mod_heartmonitor</h1>
  26 <div class="toplang">
  27 <p><span>Available Languages: </span><a href="../en/mod/mod_heartmonitor.html" title="English">&nbsp;en&nbsp;</a></p>
  28 </div>
  29 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>centralized monitor for mod_heartbeat origin servers</td></tr>
  30 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  31 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>heartmonitor_module</td></tr>
  32 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_heartmonitor.c</td></tr>
  33 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
  34 <h3>Summary</h3>
  35
  36 <p>
  37 <code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code> listens for server status messages generated
  38 by <code class="module"><a href="../mod/mod_heartbeat.html">mod_heartbeat</a></code> enabled origin servers and makes their status
  39 available to <code class="module"><a href="../mod/mod_lbmethod_heartbeat.html">mod_lbmethod_heartbeat</a></code>. This allows
  40 <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> to use the "heartbeat"
  41 <em>lbmethod</em> inside of <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>.
  42 </p>
  43
  44 <p>This module uses the services of <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> when
  45 available instead of flat-file storage.  No configuration is required to
  46 use <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code>.</p>
  47
  48     <div class="warning">
  49         To use <code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code>,
  50         <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>
  51         must be either a static modules or, if a dynamic module, it must
  52         be loaded before <code class="module"><a href="../mod/mod_heartmonitor.html">mod_heartmonitor</a></code>.
  53     </div>
  54
  55 </div>
  56 <div id="quickview"><h3 class="directives">Directives</h3>
  57 <ul id="toc">
  58 <li><img alt="" src="../images/down.gif" /> <a href="#heartbeatlisten">HeartbeatListen</a></li>
  59 <li><img alt="" src="../images/down.gif" /> <a href="#heartbeatmaxservers">HeartbeatMaxServers</a></li>
  60 <li><img alt="" src="../images/down.gif" /> <a href="#heartbeatstorage">HeartbeatStorage</a></li>
  61 </ul>
  62 <ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
  63
  64 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  65 <div class="directive-section"><h2><a name="HeartbeatListen" id="HeartbeatListen">HeartbeatListen</a> <a name="heartbeatlisten" id="heartbeatlisten">Directive</a></h2>
  66 <table class="directive">
  67 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>multicast address to listen for incoming heartbeat requests </td></tr>
  68 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatListen<var>addr:port</var></code></td></tr>
  69 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>disabled</code></td></tr>
  70 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
  71 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  72 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
  73 </table>
  74     <p>The <code class="directive">HeartbeatListen</code> directive specifies the
  75     multicast address on which the server will listen for status information from
  76     <code class="module"><a href="../mod/mod_heartbeat.html">mod_heartbeat</a></code>-enabled servers.  This
  77     address will usually correspond to a configured  <code class="directive"><a href="../mod/mod_heartbeat.html#heartbeataddress">HeartbeatAddress</a></code> on an origin server.
  78     </p>
  79
  80     <pre class="prettyprint lang-config">
  81     HeartbeatListen 239.0.0.1:27999
  82     </pre>
  83
  84
  85     <p> This module is inactive until this directive is used.</p>
  86
  87 </div>
  88 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  89 <div class="directive-section"><h2><a name="HeartbeatMaxServers" id="HeartbeatMaxServers">HeartbeatMaxServers</a> <a name="heartbeatmaxservers" id="heartbeatmaxservers">Directive</a></h2>
  90 <table class="directive">
  91 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specifies the maximum number of servers that will be sending
  92 heartbeat requests to this server</td></tr>
  93 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatMaxServers <var>number-of-servers</var></code></td></tr>
  94 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>HeartbeatMaxServers 10</code></td></tr>
  95 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
  96 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  97 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
  98 </table>
  99     <p>The <code class="directive">HeartbeatMaxServers</code> directive specifies the
 100     maximum number of servers that will be sending requests to this monitor
 101     server.  It is used to control the size of the shared memory allocated
 102     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>
 103
 104 </div>
 105 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 106 <div class="directive-section"><h2><a name="HeartbeatStorage" id="HeartbeatStorage">HeartbeatStorage</a> <a name="heartbeatstorage" id="heartbeatstorage">Directive</a></h2>
 107 <table class="directive">
 108 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Path to store heartbeat data</td></tr>
 109 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>HeartbeatStorage <var>file-path</var></code></td></tr>
 110 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>HeartbeatStorage logs/hb.dat</code></td></tr>
 111 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
 112 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 113 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_heartmonitor</td></tr>
 114 </table>
 115     <p>The <code class="directive">HeartbeatStorage</code> directive specifies the
 116     path to store heartbeat data.  This flat-file is used only when
 117     <code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> is not loaded.</p>
 118
 119 </div>
 120 </div>
 121 <div class="bottomlang">
 122 <p><span>Available Languages: </span><a href="../en/mod/mod_heartmonitor.html" title="English">&nbsp;en&nbsp;</a></p>
 123 </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>This section is experimental!</strong><br />Comments placed here should not be expected
 124 to last beyond the testing phase of this system, nor do we in any way guarantee that we'll read them.</div>
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