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<div class="section" id="patterns">
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<h1>Patterns<a class="headerlink" href="#patterns" 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="admonition-see-also admonition seealso">
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<p class="first admonition-title">See also</p>
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<dt><a class="reference internal" href="examples.html"><em>Examples</em></a></dt>
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<dd>Examples of basic commands</dd>
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<dt><a class="reference internal" href="playbooks.html"><em>Playbooks</em></a></dt>
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<p>Ansible works against multiple systems in your infrastructure at the
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same time. It does this by selecting portions of systems listed in Ansible’s inventory file,
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which defaults to /etc/ansible/hosts, and looks like this:</p>
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<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>
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<span class="p">[</span><span class="n">webservers</span><span class="p">]</span>
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<span class="n">foo</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
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<span class="n">bar</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
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<span class="p">[</span><span class="n">dbservers</span><span class="p">]</span>
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<span class="n">one</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
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<span class="n">two</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span>
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<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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</pre></div>
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</div>
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<div class="section" id="targetting-all-systems">
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<h2>Targetting All Systems<a class="headerlink" href="#targetting-all-systems" title="Permalink to this headline">¶</a></h2>
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<p>The pattern ‘all’ or ‘*’ targets all systems in the inventory file.</p>
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</div>
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<div class="section" id="specific-hosts">
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<h2>Specific Hosts<a class="headerlink" href="#specific-hosts" title="Permalink to this headline">¶</a></h2>
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<p>It is possible to address specific hosts:</p>
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<blockquote>
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<div>one.example.com
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one.example.com:two.example.com</div></blockquote>
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</div>
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<div class="section" id="groups">
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<h2>Groups<a class="headerlink" href="#groups" title="Permalink to this headline">¶</a></h2>
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<p>The following patterns address one or more groups:</p>
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<blockquote>
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<div>webservers
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webservers:dbservers</div></blockquote>
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<p>There is also a magic group ‘ungrouped’ which selects systems not in a group.</p>
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</div>
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<div class="section" id="wildcards">
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<h2>Wildcards<a class="headerlink" href="#wildcards" title="Permalink to this headline">¶</a></h2>
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<p>Individual hosts, but not groups, can also be referenced using wildcards:</p>
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<blockquote>
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<div><a href="#id1"><span class="problematic" id="id2">*</span></a>.example.com
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<a href="#id3"><span class="problematic" id="id4">*</span></a>.com</div></blockquote>
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</div>
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<div class="section" id="mixing-things-up">
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<h2>Mixing Things Up<a class="headerlink" href="#mixing-things-up" title="Permalink to this headline">¶</a></h2>
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<p>Specific hosts, wildcards, and groups can all be mixed in the same pattern</p>
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<blockquote>
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<div>one*.com:dbservers</div></blockquote>
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<p>It is not possible to target a host not in the inventory file.</p>
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<h3><a href="index.html">Table Of Contents</a></h3>
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<li><a class="reference internal" href="#">Patterns</a><ul>
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<li><a class="reference internal" href="#targetting-all-systems">Targetting All Systems</a></li>
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<li><a class="reference internal" href="#specific-hosts">Specific Hosts</a></li>
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<li><a class="reference internal" href="#groups">Groups</a></li>
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<li><a class="reference internal" href="#wildcards">Wildcards</a></li>
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<li><a class="reference internal" href="#mixing-things-up">Mixing Things Up</a></li>
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© Copyright 2012 Michael DeHaan.
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Last updated on Mar 08, 2012.
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