ansible/html/patterns.html
2012-03-09 11:50:07 -05:00

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<div class="section" id="the-inventory-file-patterns-and-groups">
<span id="patterns"></span><h1>The Inventory File, Patterns, and Groups<a class="headerlink" href="#the-inventory-file-patterns-and-groups" title="Permalink to this headline"></a></h1>
<p>How to select hosts you wish to manage</p>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
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<dt><a class="reference internal" href="examples.html"><em>Command Line Examples</em></a></dt>
<dd>Examples of basic commands</dd>
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<dd>Learning ansible&#8217;s configuration management language</dd>
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<div class="section" id="inventory-file-format">
<h2>Inventory File Format<a class="headerlink" href="#inventory-file-format" title="Permalink to this headline"></a></h2>
<p>Ansible works against multiple systems in your infrastructure at the
same time. It does this by selecting portions of systems listed in Ansible&#8217;s inventory file,
which defaults to /etc/ansible/hosts, and looks like this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">mail</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="p">[</span><span class="n">webservers</span><span class="p">]</span>
<span class="n">foo</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="n">bar</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="p">[</span><span class="n">dbservers</span><span class="p">]</span>
<span class="n">one</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="n">two</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
<span class="n">three</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
</pre></div>
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<div class="section" id="selecting-targets">
<h2>Selecting Targets<a class="headerlink" href="#selecting-targets" title="Permalink to this headline"></a></h2>
<p>These patterns target all hosts in the inventory file:</p>
<div class="highlight-python"><pre>all
*</pre>
</div>
<p>It is also possible to address specific hosts:</p>
<div class="highlight-python"><pre>one.example.com
one.example.com:two.example.com</pre>
</div>
<p>The following patterns address one or more groups, which are denoted
with the bracket headers in the inventory file:</p>
<div class="highlight-python"><pre>webservers
webservers:dbservers</pre>
</div>
<p>Individual hosts, but not groups, can also be referenced using
wildcards:</p>
<div class="highlight-python"><pre>*.example.com
*.com</pre>
</div>
<p>It&#8217;s also ok to mix wildcard patterns and groups at the same time:</p>
<div class="highlight-python"><pre>one*.com:dbservers</pre>
</div>
<p>NOTE: It is not possible to target a host not in the inventory file.</p>
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