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Better explain precedence.

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Michael DeHaan 2013-02-02 12:29:49 -05:00
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docsite/rst/playbooks2.rst
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@ -822,22 +822,27 @@ Understanding Variable Precedence
You have already learned about inventory host and group variables, 'vars', and 'vars_files'.
If a variable name is defined in more than one place with the same name, priority is as follows
to determine which place sets the value of the variable.
to determine which place sets the value of the variable. Lower numbered items have the highest
priority.
1. Variables loaded from YAML files mentioned in 'vars_files' in a playbook.
1. Any variables specified with --extra-vars (-e) on the ansible-playbook command line.
2. facts, whether built in or custom, or variables assigned from the 'register' keyword.
2. Variables loaded from YAML files mentioned in 'vars_files' in a playbook.
3. variables passed to parameterized task include statements.
3. facts, whether built in or custom, or variables assigned from the 'register' keyword.
4. 'vars' as defined in the playbook.
4. variables passed to parameterized task include statements.
5. Host variables from inventory.
5. 'vars' as defined in the playbook.
6. Group variables from inventory, in order of least specific group to most specific.
6. Host variables from inventory.
7. Group variables from inventory in inheritance order. This means if a group includes a sub-group, the variables
in the subgroup have higher precedence.
Therefore, if you want to set a default value for something you wish to override somewhere else, the best
place to set such a default is in a group variable.
place to set such a default is in a group variable. The 'group_vars/all' file makes an excellent place to put global
variables that are true across your entire site, since everything has higher priority than these values.
Style Points
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