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<div class="section" title="Adaptive Monitoring">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="adaptive"></a><a name="adaptive_monitoring"></a>Adaptive Monitoring</h2></div></div></div>
<p><span class="bold"><strong>Introduction</strong></span></p>
<p>Icinga allows you to change certain commands and host and service check attributes during runtime. I'll refer to
this feature as "adaptive monitoring". Please note that the adaptive monitoring features found in Icinga will probably
not be of much use to 99% of users, but they do allow you to do some neat things.</p>
<p><span class="bold"><strong>What Can Be Changed?</strong></span></p>
<p>The following service check attributes can be changed during runtime:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p>Check command (and command arguments)</p>
</li>
<li class="listitem">
<p>Check interval</p>
</li>
<li class="listitem">
<p>Max check attempts</p>
</li>
<li class="listitem">
<p>Check timeperiod</p>
</li>
<li class="listitem">
<p>Event handler command (and command arguments)</p>
</li>
</ul></div>
<p>The following host check attributes can be changed during runtime:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p>Check command (and command arguments)</p>
</li>
<li class="listitem">
<p>Check interval</p>
</li>
<li class="listitem">
<p>Max check attempts</p>
</li>
<li class="listitem">
<p>Check timeperiod</p>
</li>
<li class="listitem">
<p>Event handler command (and command arguments)</p>
</li>
</ul></div>
<p>The following global attributes can be changed during runtime:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p>Global host event handler command (and command arguments)</p>
</li>
<li class="listitem">
<p>Global service event handler command (and command arguments)</p>
</li>
</ul></div>
<p><span class="bold"><strong>External Commands For Adaptive Monitoring</strong></span></p>
<p>In order to change global or host- or service-specific attributes during runtime, you must submit the appropriate <a class="link" href="extcommands.html" title="External Commands">external command</a> to Icinga via the <a class="link" href="configmain.html#configmain-command_file">external command
file</a>. The table below lists the different attributes that may be changed during runtime, along with the external command
to accomplish the job.</p>
<p>A full listing of external commands that can be used for adaptive monitoring (along with examples of how to use them) can
be found online at the following URL: <a class="link" href="http://www.nagios.org/developerinfo/externalcommands/" target="_top">http://www.nagios.org/developerinfo/externalcommands/</a></p>
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<th align="left">Note</th>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p>When changing check commands, check timeperiods, or event handler commands, it is important to note that the new
values for these options must have been defined before Icinga was started. Any request to change a command or
timeperiod to one which had not been defined when Icinga was started is ignored.</p>
</li>
<li class="listitem">
<p>You can specify command arguments along with the actual command name - just separate individual arguments from the
command name (and from each other) using bang (!) characters. More information on how arguments in command definitions are
processed during runtime can be found in the documentation on <a class="link" href="macros.html" title="Understanding Macros and How They Work">macros</a>.</p>
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