Where can variables be specified in roles in the context of DevOps?

Where can variables be specified in roles within the DevOps context:

• Inside the role itself: In the defaults/main.yml file for default values that can be overridden, and in vars/main.yml for role-specific variables that are not meant to be overridden externally.
• At the Playbook level: In the vars section of the playbook or in separate variable files included via vars_files. This is convenient for variables common to multiple tasks or roles within a single playbook.
• At the Inventory level: In inventory files (hosts.yml, inventory.ini) or in files for specific groups (group_vars/) and hosts (host_vars/). Variables defined here apply to all hosts or groups specified in the inventory.
• Via the command line: Using the -e or --extra-vars parameter when running ansible-playbook. This allows for dynamic passing of variables.
• In Vault files: For storing confidential data such as passwords or API keys. Variables from Vault are decrypted by Ansible during execution.

Variable priority when applied:

1. Extra Vars (from the command line)
2. Vars in the Playbook
3. Vars_files in the Playbook
4. Role vars (vars/main.yml in the role)
5. Inventory vars (host_vars/, group_vars/)
6. Role defaults (defaults/main.yml in the role)