Ansible Vars
Ansible does apply variable precedence, and you might have a use for it. Here is the order of precedence from least to greatest (the last listed variables override all other variables):
- command line values (for example, -u my_user, these are not variables)
- role defaults (as defined in Role directory structure) 1
- inventory file or script group vars 2
- inventory group_vars/all 3
- playbook group_vars/all 3
- inventory group_vars/* 3
- playbook group_vars/* 3
- inventory file or script host vars 2
- inventory host_vars/* 3
- playbook host_vars/* 3
- host facts / cached set_facts 4
- play vars
- play vars_prompt
- play vars_files
- role vars (as defined in Role directory structure)
- block vars (only for tasks in block)
- task vars (only for the task)
- include_vars
- set_facts / registered vars
- role (and include_role) params
- include params
- extra vars (for example, -e "user=my_user")(always win precedence)