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<li class="toctree-l1"><a class="reference internal" href="cdist-preos.html">21. PreOS</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">22. Scan</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#description">22.1. Description</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#usage-examples">22.2. Usage (Examples)</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#modes">22.3. Modes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#name-mapper-script">22.4. Name Mapper Script</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-best-practice.html">25. Best practice</a></li>
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<li><span class="section-number">22. </span>Scan</li>
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<div class="section" id="scan">
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<h1><span class="section-number">22. </span>Scan<a class="headerlink" href="#scan" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="description">
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<h2><span class="section-number">22.1. </span>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Runs cdist as a daemon that discover/watch on hosts and reconfigure them
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periodically. It is especially useful in netboot-based environment where hosts
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boot unconfigured, and to ensure your infrastructure stays in sync with your
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configuration.</p>
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<p>This feature is still consider to be in <strong>beta</strong> stage, and only operate on
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IPv6 (including link-local).</p>
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</div>
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<div class="section" id="usage-examples">
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<h2><span class="section-number">22.2. </span>Usage (Examples)<a class="headerlink" href="#usage-examples" title="Permalink to this headline">¶</a></h2>
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<p>Discover hosts on local network and configure those whose name is resolved by
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the name mapper script.</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ cdist scan --beta --interface eth0 <span class="se">\</span>
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--mode scan --name-mapper path/to/script <span class="se">\</span>
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--mode trigger --mode config
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</pre></div>
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</div>
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<p>List known hosts and exit.</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ cdist scan --beta --list --name-mapper path/to/script
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</pre></div>
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</div>
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<p>Please refer to <cite>cdist(1)</cite> for a detailed list of parameters.</p>
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</div>
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<div class="section" id="modes">
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<h2><span class="section-number">22.3. </span>Modes<a class="headerlink" href="#modes" title="Permalink to this headline">¶</a></h2>
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<p>The scanner has 3 modes that can be independently toggled. If the <cite>--mode</cite>
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parameter is not specified, only <cite>tigger</cite> and <cite>scan</cite> are enabled (= hosts are
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not configured).</p>
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<dl class="simple">
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<dt>trigger</dt><dd><p>Send ICMPv6 requests to specific hosts or broadcast over IPv6 link-local to
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trigger detection by the <cite>scan</cite> module.</p>
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</dd>
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<dt>scan</dt><dd><p>Watch for incoming ICMPv6 replies and optionally configure detected hosts.</p>
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</dd>
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<dt>config</dt><dd><p>Enable configuration of hosts detected by <cite>scan</cite>.</p>
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</dd>
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</dl>
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</div>
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<div class="section" id="name-mapper-script">
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<h2><span class="section-number">22.4. </span>Name Mapper Script<a class="headerlink" href="#name-mapper-script" title="Permalink to this headline">¶</a></h2>
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<p>The name mapper script takes an IPv6 address as first argument and writes the
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resolved name to stdout - if any. The script must be executable.</p>
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<p>Simplest script:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="ch">#!/bin/sh</span>
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<span class="k">case</span> <span class="s2">"</span><span class="nv">$1</span><span class="s2">"</span> in
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<span class="s2">"fe80::20d:b9ff:fe57:3524"</span><span class="o">)</span>
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<span class="nb">printf</span> <span class="s2">"my-host-01"</span>
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<span class="p">;;</span>
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<span class="s2">"fe80::7603:bdff:fe05:89bb"</span><span class="o">)</span>
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<span class="nb">printf</span> <span class="s2">"my-host-02"</span>
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<span class="p">;;</span>
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<span class="k">esac</span>
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</pre></div>
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</div>
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<p>Resolving name from <cite>PTR</cite> DNS record:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="ch">#!/bin/sh</span>
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<span class="k">for</span> cmd in dig sed<span class="p">;</span> <span class="k">do</span>
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<span class="k">if</span> ! <span class="nb">command</span> -v <span class="nv">$cmd</span> > /dev/null<span class="p">;</span> <span class="k">then</span>
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<span class="nb">exit</span> <span class="m">1</span>
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<span class="k">fi</span>
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<span class="k">done</span>
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dig +short -x <span class="s2">"</span><span class="nv">$1</span><span class="s2">"</span> <span class="p">|</span> sed -e <span class="s1">'s/.$//'</span>
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</pre></div>
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