How do you initiate the execution of playbooks or roles in automation?

In Ansible, the execution of playbooks or roles is initiated by the ansible-playbook command with the specified playbook file. For example:

ansible-playbook site.yml

If you need to execute a specific role, it is usually included in a playbook, and then the playbook is run. Roles are not run directly.

You can also use tags to run specific tasks or roles:

ansible-playbook site.yml --tags "role_name"

For automation, you can set up a CI/CD pipeline that calls ansible-playbook with the required parameters.