Ansible

参考: Official

変数の優先順位

参考: Understanding variable precedence

優先順位は下に行くほど高くなる（後から定義されたものが勝つ）。

1. command line values (例: -u my_user, これは変数ではない)
2. role defaults
3. inventory file or script group vars
4. inventory group_vars/all
5. playbook group_vars/all
6. inventory group_vars/*
7. playbook group_vars/*
8. inventory file or script host vars
9. inventory host_vars/*
10. playbook host_vars/*
11. host facts / cached set_facts
12. play vars
13. play vars_prompt
14. play vars_files
15. role vars
16. block vars (only for tasks in block)
17. task vars (only for the task)
18. include_vars
19. set_facts / registered vars
20. role (and include_role) params
21. include params
22. extra vars (例: -e "user=my_user") — 常に最優先