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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
playbooks (our configuration management language) are expressed.
You may also wish to read playbook examples and will quickly pick this up from those.< / p >
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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
< cite > ansible< / cite > or not) should start with < tt class = "docutils literal" > < span class = "pre" > ---< / span > < / tt > .< / p >
< 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 >
< div class = "highlight-python" > < pre > ---
# A list of tasty fruits
- Apple
- Orange
- Strawberry
- Mango< / pre >
< / div >
< p > In the second way a list is represented as comma separated elements
surrounded by square brackets. Newlines are permitted between
elements:< / p >
< div class = "highlight-python" > < pre > ---
# A list of tasty fruits
[apple, orange, banana, mango]< / pre >
< / div >
< 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 >
< div class = "highlight-python" > < pre > ---
# An employee record
name: John Eckersberg
job: Developer
skill: Elite< / pre >
< / div >
< p > Like lists, dictionaries can be represented in an abbreviated form:< / p >
< div class = "highlight-python" > < pre > ---
# An employee record
{name: John Eckersberg, job: Developer, skill: Elite}< / pre >
< / div >
< p id = "truthiness" > You can specify a boolean value (true/false) in several forms:< / p >
< div class = "highlight-python" > < pre > ---
knows_oop: True
likes_emacs: TRUE
uses_cvs: false< / pre >
< / div >
< p > Finally, you can combine these data structures:< / p >
< div class = "highlight-python" > < pre > ---
# An employee record
name: John Eckersberg
job: Developer
skill: Elite
employed: True
foods:
- Apple
- Orange
- Strawberry
- Mango
languages:
ruby: Elite
python: Elite
dotnet: Lame< / pre >
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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" >
< p class = "first admonition-title" > See also< / p >
< dl class = "last docutils" >
< dt > < a class = "reference external" href = "http://yamllint.com/" > YAMLLint< / a > < / dt >
< dd > YAML Lint gets the lint out of your YAML< / dd >
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© Copyright 2012 Michael DeHaan.< br / >
Last updated on Mar 09, 2012.< br / >
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