83 lines
2 KiB
ReStructuredText
83 lines
2 KiB
ReStructuredText
YAML Format
|
|
===========
|
|
|
|
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.
|
|
|
|
YAML Basics
|
|
-----------
|
|
|
|
For `ansible`, every YAML file must be a list at it's root-most
|
|
element. Each item in the list is a dictionary. These dictionaries
|
|
represent all the options you can use to write an `ansible` file. In
|
|
addition, all YAML files (regardless of their association with
|
|
`ansible` or not) should start with ``---``.
|
|
|
|
In YAML a list can be represented in two ways. In one way all members
|
|
of a list are lines beginning at the same indenta`tion level starting
|
|
with a ``-`` character::
|
|
|
|
---
|
|
# A list of tasty fruits
|
|
- Apple
|
|
- Orange
|
|
- Strawberry
|
|
- Mango
|
|
|
|
In the second way a list is represented as comma separated elements
|
|
surrounded by square brackets. Newlines are permitted between
|
|
elements::
|
|
|
|
---
|
|
# A list of tasty fruits
|
|
[apple, orange, banana, mango]
|
|
|
|
A dictionary is represented in a simple ``key:`` and ``value`` form::
|
|
|
|
---
|
|
# An employee record
|
|
name: John Eckersberg
|
|
job: Developer
|
|
skill: Elite
|
|
|
|
Like lists, dictionaries can be represented in an abbreviated form::
|
|
|
|
---
|
|
# An employee record
|
|
{name: John Eckersberg, job: Developer, skill: Elite}
|
|
|
|
.. _truthiness:
|
|
|
|
You can specify a boolean value (true/false) in several forms::
|
|
|
|
---
|
|
knows_oop: True
|
|
likes_emacs: TRUE
|
|
uses_cvs: false
|
|
|
|
Finally, you can combine these data structures::
|
|
|
|
---
|
|
# 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::
|
|
|
|
`YAMLLint <http://yamllint.com/>`_
|
|
YAML Lint gets the lint out of your YAML
|