ansible/rst/YAMLSyntax.rst

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YAML Syntax
===========
This page provides a basic overview of correct YAML syntax, which is how Ansible
playbooks (our configuration management language) are expressed.
We use YAML because it is easier to read and write for humans than other common
data formats like XML or JSON. Further, there are libraries available for reading
and writing YAML in most programming languages.
You may also wish to read playbook examples at the same time to see how this
is used in practice.
.. seealso::
:doc:`playbooks`
See YAML examples in practice in playbooks
YAML Basics
-----------
For `ansible`, nearly every YAML file starts with a list.
Each item in the list is a list of key/value pairs, commonly
called a "hash" or a "dictionary". So, we need to know how
to write lists and dictionaries in YAML.
There's another small quirk to YAML. All YAML files (regardless of their association with
`ansible` or not) should start with ``---``. This is just a YAML
format thing that means "this is the start of a document".
All members of a list are lines beginning at the same indentation level starting
with a ``-`` (dash) character::
---
# A list of tasty fruits
- Apple
- Orange
- Strawberry
- Mango
A dictionary is represented in a simple ``key:`` and ``value`` form::
---
# An employee record
name: John Eckersberg
job: Developer
skill: Elite
Dictionaries can also be represented in an abbreviated form if you really want to::
---
# An employee record
{name: John Eckersberg, job: Developer, skill: Elite}
.. _truthiness:
Ansible doesn't really use these too much, but you can also specify a
boolean value (true/false) in several forms::
---
knows_oop: True
likes_emacs: TRUE
uses_cvs: false
Let's combine what we learned so far in an arbitary YAML example. This really
has nothing to do with Ansible, but will give you a feel for the format::
---
# An employee record
name: John Eckersberg
job: Developer
skill: Elite
employed: True
foods:
- Apple
- Orange
- Strawberry
- Mango
languages:
ruby: Elite
python: Elite
dotnet: Lame
That's all you really need to know about YAML to get started writing
`Ansible` playbooks.
.. seealso::
:doc:`playbooks`
Learn what playbooks can do and how to write/run them.
`YAMLLint <http://yamllint.com/>`_
YAML Lint (online) helps you debug YAML syntax if you are having problems