Docker systemd unit remains masked on Debian & Ubuntu

[Mark Goddard]

In the docker role, when running on Debian family hosts, we mask the docker.service systemd unit before installing docker, to prevent it from starting unconfigured. We later try to unmask the service using the Ansible systemd module, however this does not seem to work, and the service remains masked.

This would be likely to prevent docker from starting after a reboot, and also breaks cephadm bootstrap.

Seen on Ubuntu Focal, Kolla Ansible Wallaby.

[Mark Goddard (mgoddard)]

ansible 2.10.17
  config file = None
  configured module search path = ['/home/mark/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/mark/deployment/venvs/kolla-ansible/lib/python3.8/site-packages/ansible
  executable location = ../../venvs/kolla-ansible/bin/ansible
  python version = 3.8.10 (default, Jun 22 2022, 20:18:18) [GCC 9.4.0]

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/ansible-collection-kolla/+/857867