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<li><a class="reference internal" href="#">YAML Format</a><ul>
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<li><a class="reference internal" href="#yaml-basics">YAML Basics</a></li>
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<div class="section" id="yaml-format">
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<h1>YAML Format<a class="headerlink" href="#yaml-format" title="Permalink to this headline">¶</a></h1>
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<p>This page provides a basic overview of correct YAML syntax, which is how Ansible
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playbooks (our configuration management language) are expressed.
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You may also wish to read playbook examples and will quickly pick this up from those.</p>
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<div class="section" id="yaml-basics">
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<h2>YAML Basics<a class="headerlink" href="#yaml-basics" title="Permalink to this headline">¶</a></h2>
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<p>For <cite>ansible</cite>, every YAML file must be a list at it’s root-most
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element. Each item in the list is a dictionary. These dictionaries
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represent all the options you can use to write an <cite>ansible</cite> file. In
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addition, all YAML files (regardless of their association with
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<cite>ansible</cite> or not) should start with <tt class="docutils literal"><span class="pre">---</span></tt>.</p>
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<p>In YAML a list can be represented in two ways. In one way all members
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of a list are lines beginning at the same indentation level starting
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with a <tt class="docutils literal"><span class="pre">-</span></tt> character:</p>
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<div class="highlight-python"><pre>---
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# A list of tasty fruits
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- Apple
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- Orange
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- Strawberry
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- Mango</pre>
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</div>
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<p>In the second way a list is represented as comma separated elements
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surrounded by square brackets. Newlines are permitted between
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elements:</p>
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<div class="highlight-python"><pre>---
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# A list of tasty fruits
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[apple, orange, banana, mango]</pre>
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</div>
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<p>A dictionary is represented in a simple <tt class="docutils literal"><span class="pre">key:</span></tt> and <tt class="docutils literal"><span class="pre">value</span></tt> form:</p>
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<div class="highlight-python"><pre>---
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# An employee record
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name: John Eckersberg
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job: Developer
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skill: Elite</pre>
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</div>
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<p>Like lists, dictionaries can be represented in an abbreviated form:</p>
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<div class="highlight-python"><pre>---
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# An employee record
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{name: John Eckersberg, job: Developer, skill: Elite}</pre>
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</div>
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<p id="truthiness">You can specify a boolean value (true/false) in several forms:</p>
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<div class="highlight-python"><pre>---
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knows_oop: True
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likes_emacs: TRUE
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uses_cvs: false</pre>
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</div>
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<p>Finally, you can combine these data structures:</p>
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<div class="highlight-python"><pre>---
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# An employee record
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name: John Eckersberg
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job: Developer
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skill: Elite
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employed: True
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foods:
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- Apple
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- Orange
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- Strawberry
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- Mango
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languages:
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ruby: Elite
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python: Elite
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dotnet: Lame</pre>
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</div>
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<p>That’s all you really need to know about YAML to get started writing
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<cite>Ansible</cite> playbooks.</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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<dl class="last docutils">
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<dt><a class="reference external" href="http://yamllint.com/">YAMLLint</a></dt>
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<dd>YAML Lint gets the lint out of your YAML</dd>
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</dl>
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</div>
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</div>
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 09, 2012.<br/>
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