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<h1><a name="high_availability" id="high_availability">High availability</a></h1>
<div class="level1">
<p>
LemonLDAP::NG is highly scalable, so easy to insert behind a load-balancer:
</p>
<ul>
<li class="level1"><div class="li"> Portal does not store any data outside the session database, so you can have many portal servers using the same <acronym title="Hyper Text Transfer Protocol">HTTP</acronym> host name</div>
</li>
<li class="level1"><div class="li"> All handlers download the whole configuration, so many servers can serve the same virtual hosts</div>
</li>
</ul>
<p>
You can for example set up a fail-over cluster with <a href="http://www.linux-ha.org/wiki/Heartbeat" class="urlextern" title="http://www.linux-ha.org/wiki/Heartbeat" rel="nofollow">Heartbeat</a> and <a href="http://haproxy.1wt.eu/" class="urlextern" title="http://haproxy.1wt.eu/" rel="nofollow">HAproxy</a>, like this:
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<a href="/_detail/documentation/ha-apache.png?id=documentation%3A1.3%3Ahighavailability" class="media" title="documentation:ha-apache.png"><img src="../../../media/documentation/ha-apache.png" class="mediacenter" alt="" /></a>
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<p>
You just have to share configuration and sessions databases between those servers:
</p>
<p>
<a href="/_detail/documentation/ha-sessions-configuration.png?id=documentation%3A1.3%3Ahighavailability" class="media" title="documentation:ha-sessions-configuration.png"><img src="../../../media/documentation/ha-sessions-configuration.png" class="mediacenter" alt="" /></a>
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