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<div class="section" id="ohai">
<span id="server-plugins-probes-ohai"></span><h1>Ohai<a class="headerlink" href="#ohai" title="Permalink to this headline">¶</a></h1>
<p>The <a class="reference external" href="http://wiki.opscode.com/display/chef/Ohai">Ohai</a> plugin is used to detect information about the client
operating system. The data is reported back to the server using JSON.</p>
<div class="section" id="client-prerequisites">
<h2>Client prerequisites<a class="headerlink" href="#client-prerequisites" title="Permalink to this headline">¶</a></h2>
<p>On the client, you need to install <a class="reference external" href="http://wiki.opscode.com/display/chef/Ohai">Ohai</a>. See <a class="reference external" href="http://wiki.opscode.com/display/chef/Ohai+Installation+and+Use">Ohai-Install</a> for more
information.</p>
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<div class="section" id="server-prerequisites">
<h2>Server prerequisites<a class="headerlink" href="#server-prerequisites" title="Permalink to this headline">¶</a></h2>
<p>If you have python 2.6 or later installed, you can continue on to
<a class="reference internal" href="#ohai-setup"><em>Setup</em></a>. Otherwise, you will need to install the
python-simplejson module found packaged in most distributions.</p>
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<div class="section" id="setup">
<span id="ohai-setup"></span><h2>Setup<a class="headerlink" href="#setup" title="Permalink to this headline">¶</a></h2>
<p>To enable the Ohai plugin, you need to first create an <tt class="docutils literal"><span class="pre">Ohai</span></tt> directory
in your Bcfg2 repository (e.g. <tt class="docutils literal"><span class="pre">/var/lib/bcfg2/Ohai</span></tt>). You then need
to add <strong>Ohai</strong> to the plugins line in <tt class="docutils literal"><span class="pre">bcfg2.conf</span></tt>. Once this is done,
restart the server and start a client run. You will have the JSON output
from the client in the <tt class="docutils literal"><span class="pre">Ohai</span></tt> directory you created previously.</p>
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<li><a class="reference internal" href="#setup">Setup</a></li>
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