CODEWITHSUNDEEP
ansible
user555303
user555303

Reputation: 1374

Ansible: What is the variable order/precedence in case of multiple 'extra_vars' files?

In this older question about "Can extra_vars receive multiple files?", the original poster answered the question, saying that multiple vars files could be accomplished by just using multiple --extra-vars parameters.

The followup question that I have is that, in such a case, where the ansible-playbook command line has two --extra-vars parameters, each pointing to a different file, what is the order or precedence of those files?

Also, what happens if both files have the same var name (e.g., my_host) in them?

For example, say I have 2 files, extraVars1.yml and extraVars2.yml and in the ansible-playbook command line I have:

ansible-playbook... --extra-vars "@extraVars1.yml" --extra-vars "@extraVars2.yml"

and the extraVars1.yml file has:

my_host: 1.2.3.4

and the extraVars2.yml file has:

my_host: 5.6.7.8

What will the value of the my_host var be when the playbook is run?

Thanks! Jim

Upvotes: 4

Views: 2176

Answers (1)

U880D
U880D

Reputation: 12124

According the Ansible documentation about Using Variables and Understanding variable precedence

extra vars (for example, -e "user=my_user") (always win precedence)

In general, Ansible gives precedence to variables that were defined more recently ...

This means the last defined wins.

Lets have a short test here with a vars.yml playbook.

---
- hosts: localhost
  become: false
  gather_facts: false

  vars:

    my_host: 9.0.0.0

  tasks:

  - name: Show value
    debug:
      msg: "{{ my_host }}"

The execution of ansible-playbook vars.yml will result into an output of

TASK [Show value] ***
ok: [localhost] =>
  msg: 9.0.0.0

The execution of ansible-playbook -e "@extraVars1.yml" vars.yml will result into an output of

TASK [Show value] ***
ok: [localhost] =>
  msg: 1.2.3.4

The execution of ansible-playbook -e "@extraVars1.yml" -e "@extraVars2.yml" vars.yml will result into an output of

TASK [Show value] ***
ok: [localhost] =>
  msg: 5.6.7.8

The execution of ansible-playbook -e "@extraVars2.yml" -e "@extraVars1.yml" vars.yml will result into an output of

TASK [Show value] ***
ok: [localhost] =>
  msg: 1.2.3.4

Upvotes: 4

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