Ansible Cheatsheet

Variable precendence order

Order, order please!

1. command line values (eg “-u user”)
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 (defined in role/vars/main.yml)
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 (always win precedence)

Load distro specific variables

- name: Load operating system specific variables
  include_vars: "{{ item }}"
  failed_when: false
  loop:
      - "family-{{ ansible_os_family | lower }}.yml"
      - "family-{{ ansible_os_family | lower }}-{{ ansible_distribution_major_version | lower }}.yml"
      - "{{ ansible_distribution | lower | replace(' ', '-') }}.yml"
      - "{{ ansible_distribution | lower | replace(' ', '-') }}-{{ ansible_distribution_major_version | lower }}.yml"
      - "{{ ansible_distribution | lower | replace(' ', '-') }}-{{ ansible_distribution_version.split('.')[0:2] | join('-') | lower }}.yml"
      - "{{ ansible_distribution | lower | replace(' ', '-') }}-{{ ansible_distribution_version.split('.')[0:3] | join('-') | lower }}.yml"