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<div class="container">
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<div class="section" id="yaml-syntax">
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<h1>YAML Syntax<a class="headerlink" href="#yaml-syntax" 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.</p>
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<p>We use YAML because it is easier to read and write for humans than other common
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data formats like XML or JSON. Further, there are libraries available for reading
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and writing YAML in most programming languages.</p>
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<p>You may also wish to read playbook examples at the same time to see how this
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is used in practice.</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 internal" href="playbooks.html"><em>Playbooks</em></a></dt>
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<dd>See YAML examples in practice in playbooks</dd>
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</dl>
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</div>
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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>, nearly every YAML file starts with a list.
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Each item in the list is a list of key/value pairs, commonly
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called a “hash” or a “dictionary”. So, we need to know how
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to write lists and dictionaries in YAML.</p>
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<p>There’s another small quirk to YAML. 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>. This is just a YAML
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format thing that means “this is the start of a document”.</p>
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<p>All members 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> (dash) 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>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>Dictionaries can also be represented in an abbreviated form if you really want to:</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">Ansible doesn’t really use these too much, but you can also specify a
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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>Let’s combine what we learned so far in an arbitary YAML example. This really
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has nothing to do with Ansible, but will give you a feel for the format:</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 internal" href="playbooks.html"><em>Playbooks</em></a></dt>
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<dd>Learn what playbooks can do and how to write/run them.</dd>
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<dt><a class="reference external" href="http://yamllint.com/">YAMLLint</a></dt>
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<dd>YAML Lint (online) helps you debug YAML syntax if you are having problems</dd>
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</dl>
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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 13, 2012.<br/>
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