--- env_lab: hosts: rocky-1: ansible_host: 10.128.0.138 rocky-2: ansible_host: 10.128.0.156 rocky-3: ansible_host: 10.128.0.189 vars: ansible_user: cloud-user environment_name: lab # Inject roles roles: children: role_web: hosts: rocky-1: rocky-3: role_db: hosts: rocky-2: