Molecule and Docker

In order to have an almost complete and useable system to test your roles and playbook with Docker, add the following lines in your molecule/docker/molecule.yml:

platforms:
  - name: 'target'
    image: '${MOLECULE_LINUX_DISTRIBUTION:-geerlingguy/docker-debian10-ansible:latest}'
    command: ""
    volumes:
      - /sys/fs/cgroup:/sys/fs/cgroup:ro
    privileged: True
    pre_build_image: True

Explanations:

• image: the name of the Docker image to use, in this case, this one has been built for Ansible/Molecule testing
• volumes, privileged: needed to use systemd commands
• pre_build_image: it tells molecule to use directly this image instead of creating a custom one