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<div class="section" title="About Icinga">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="about"></a>About Icinga</h2></div></div></div>
<p><span class="bold"><strong><a name="whatsicinga"></a>What is Icinga?</strong></span></p>
<p>Icinga is a monitoring system checking hosts and services you specify and notifying you when things go wrong and when they
recover. It runs on multiple Linux distributions (including <a class="link" href="http://fedoraproject.org/" target="_top">Fedora</a>,
<a class="link" href="http://www.ubuntu.com/" target="_top">Ubuntu</a>, and <a class="link" href="http://www.opensuse.org/" target="_top">openSuSE</a>) as
well as several Unix platforms (including <a class="link" href="http://www.sun.com/software/solaris/" target="_top">Solaris</a> and <a class="link" href="http://www.hp.com" target="_top">HP</a>). The systems to be monitored can be nearly anything connected to a network.</p>
<p>Some of the many features of Icinga include:</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p>Monitoring of network services (<code class="systemitem">SMTP</code>, <code class="systemitem">POP3</code>, <code class="systemitem">HTTP</code>, <code class="systemitem">NNTP</code>, <code class="systemitem">PING</code>,
etc.)</p>
</li>
<li class="listitem">
<p>Monitoring of host resources (CPU load, disk usage, etc.)</p>
</li>
<li class="listitem">
<p>Simple plugin design that allows users to easily develop their own service checks</p>
</li>
<li class="listitem">
<p>Parallelized service checks</p>
</li>
<li class="listitem">
<p>Ability to define network host hierarchy using "parent" hosts, allowing detection of and distinction between hosts that are down
and those that are unreachable</p>
</li>
<li class="listitem">
<p>Contact notifications when service or host problems occur and get resolved (via email, pager, or user-defined method)</p>
</li>
<li class="listitem">
<p>Ability to define event handlers to be run during service or host events for proactive problem resolution</p>
</li>
<li class="listitem">
<p>Automatic log file rotation</p>
</li>
<li class="listitem">
<p>Support for implementing redundant monitoring hosts</p>
</li>
<li class="listitem">
<p>Optional classic web interface for viewing current network status, notification and problem history, log file, etc.</p>
</li>
<li class="listitem">
<p>Optional new Icinga web interface based on Icinga Core, IDOUtils, API using a modern and refreshed web 2.0 GUI showing current
states, historical information, using cronks and filters, creating reports with multilanguage support</p>
</li>
</ul></div>
<p><span class="bold"><strong><a name="system_requirements"></a>System requirements</strong></span></p>
<p>As mentioned above you'll need a machine running Linux or a Unix variant. If there is no precompiled version or if you want
to compile from source you need a C compiler like gcc. </p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top">
<p>Some compilers may not be suitable. That includes the C compiler on HP-UX which is used to compile a new kernel.</p>
</td></tr>
</table></div>
<p>You may also want to have TCP/IP configured as most checks will require access via the network.</p>
<p>You are not required to use one of the web interfaces included with Icinga. However, if you do decide to use them, you will
need additional software:</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<p>A Web-Server (preferrably <a class="link" href="http://www.apache.org" target="_top">Apache</a>)</p>
</li>
<li class="listitem">
<p>Thomas Boutells <a class="link" href="http://www.boutell.com/gd" target="_top">gd library</a> Version 1.6.3 or higher (required by the <a class="link" href="cgis.html#cgis-statusmap_cgi">statusmap</a>- and <a class="link" href="cgis.html#cgis-trends_cgi">trends</a>-CGIs)</p>
</li>
<li class="listitem">
<p>PHP</p>
</li>
</ol></div>
<p><span class="bold"><strong><a name="licensing"></a>Licensing</strong></span></p>
<p>Icinga is licensed under the terms of the GNU General Public License Version 2 as published by the Free Software Foundation.
This gives you legal permission to copy, distribute and/or modify Icinga under certain conditions. Read the 'LICENSE' file in the
Icinga distribution or read the online version of the license for more details. Icinga is provided AS IS with NO WARRANTY OF
ANY KIND, INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.</p>
<p><span class="bold"><strong><a name="acknowledgements"></a>Acknowledgements</strong></span></p>
<p>Several people have contributed to Icinga by either reporting bugs, suggesting improvements, writing plugins, etc. A list of
some of the many contributors to the development of Icinga can be found at <a class="link" href="http://www.icinga.org/team" target="_top">http://www.icinga.org/</a>.</p>
<p><span class="bold"><strong><a name="downloading"></a>Downloading The Latest Version</strong></span></p>
<p>You can check for new versions of Icinga at <a class="link" href="http://www.icinga.org/" target="_top">http://www.icinga.org/</a>.</p>
<p><span class="bold"><strong><a name="compatibility"></a>Compatibility</strong></span></p>
<p>Icinga is a fork of the well-known monitoring system <a class="link" href="http://www.nagios.org/" target="_top">Nagios</a>. Being
100% compatible with the internal structures of the latter Icinga enables you to use all plugins and add-ons which were/are
developed by several companies and the large community.</p>
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