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<div class="section" title="Monitoring Linux/Unix Machines">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="monitoring-linux"></a><a name="monitoring_linux"></a>Monitoring Linux/Unix Machines</h2></div></div></div>
<p><span class="bold"><strong>Introduction</strong></span></p>
<p>This document describes how you can monitor "private" services and attributes of Linux/UNIX servers, such as:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p>CPU load</p>
</li>
<li class="listitem">
<p>Memory usage</p>
</li>
<li class="listitem">
<p>Disk usage</p>
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<li class="listitem">
<p>Logged in users</p>
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<li class="listitem">
<p>Running processes</p>
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<li class="listitem">
<p>etc.</p>
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<p>Publicly available services that are provided by Linux servers (HTTP, FTP, SSH, SMTP, etc.) can be monitored easily by
following the documentation on <a class="link" href="monitoring-publicservices.html" title="Monitoring Publicly Available Services">monitoring publicly available services</a>.</p>
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<p>These instructions assume that you've installed Icinga according to the <a class="link" href="quickstart.html" title="Quickstart Installation Guides">quickstart
guide</a>. The sample configuration entries below reference objects that are defined in the sample config files
(<span class="emphasis"><em>commands.cfg</em></span>, <span class="emphasis"><em>templates.cfg</em></span>, etc.) that are installed if you follow the
quickstart.</p>
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<p><span class="bold"><strong>Overview</strong></span></p>
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<p>This document has not been completed. We would recommend you read the documentation on the <a class="link" href="addons.html#addons-nrpe">NRPE addon</a> for instructions on how to monitor a remote Linux/Unix server.</p>
</td></tr>
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<p>There are several different ways to monitor attributes or remote Linux/Unix servers. One is by using shared SSH keys and
the <span class="emphasis"><em>check_by_ssh</em></span> plugin to execute plugins on remote servers. This method will not be covered here, but can
result in high load on your monitoring server if you are monitoring hundreds or thousands of services. The overhead of setting
up/destroying SSH connections is the cause of this.</p>
<div class="informalfigure">
<div class="mediaobject"><img src="../images/nrpe.png"></div>
</div>
<p>Another common method of monitoring remote Linux/Unix hosts is to use the <a class="link" href="addons.html#addons-nrpe">NRPE addon</a>.
NRPE allows you to execute plugins on remote Linux/Unix hosts. This is useful if you need to monitor local resources/attributes
like disk usage, CPU load, memory usage, etc. on a remote host.</p>
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