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<div class="section" id="the-inventory-file-patterns-and-groups">
<h1>The Inventory File, Patterns, and Groups<a class="headerlink" href="#the-inventory-file-patterns-and-groups" title="Permalink to this headline"></a></h1>
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<p>How to select hosts you wish to manage</p>
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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>
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<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>
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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>
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</div>
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<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>
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</div>
<p>Individual hosts, but not groups, can also be referenced using wildcards:</p>
<blockquote>
<div><a href="#id1"><span class="problematic" id="id2">*</span></a>.example.com
<a href="#id3"><span class="problematic" id="id4">*</span></a>.com</div></blockquote>
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<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>
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</div>
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<p>NOTE: It is not possible to target a host not in the inventory file.</p>
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<li><a class="reference internal" href="#">The Inventory File, Patterns, and Groups</a><ul>
<li><a class="reference internal" href="#inventory-file-format">Inventory File Format</a></li>
<li><a class="reference internal" href="#selecting-targets">Selecting Targets</a></li>
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