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A minimal systemd enabled debian12 Docker image for testing Ansible roles with Molecule.

NOTE: This image does NOT contain Ansible tooling, e.g.ansible-core oryamllint. Thus, the use case is as targethost for Ansible controllers or within the Moleculecreate/converge/test cycle.

docker pull trfore/docker-debian12-systemd

This image is built on Docker Hub automatically any time the upstream OS image is rebuilt, and any time a commit is madeor merged to themain branch. But if you need to build the image on your own locally, do the following:

1. Installdocker
2. Clone the repo,git clone https://github.com/trfore/docker-debian12-systemd.git
3. cd into the directory
4. Rundocker build --tag trfore/docker-debian12-systemd .

• Add the following code to your molecule scenario file, e.g.molecule/default/molecule.yml.

  platforms:  -name:${MOLECULE_NAME:-instance}image:${MOLECULE_IMAGE:-trfore/docker-debian12-systemd}command:${MOLECULE_COMMAND:-""}tmpfs:      -/run      -/tmpvolumes:      -/sys/fs/cgroup:/sys/fs/cgroup:rwcgroupns_mode:hostprivileged:truepre_build_image:true

• Installdocker

• Build an image locally (see above) or pull from Docker Hub:docker pull trfore/docker-debian12-systemd:latest

• On Docker with Cgroup V1 (e.g. Ubuntu 20.04), run a container from the image:

  docker run -d -it --name debian12-systemd --privileged --cgroupns=host --tmpfs=/run --tmpfs=/tmp --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro trfore/docker-debian12-systemd:latest

• On Docker with Cgroup V2 (e.g. Ubuntu 22.04), run a container from the image:

  docker run -d -it --name debian12-systemd --privileged --cgroupns=host --tmpfs=/run --tmpfs=/tmp --volume=/sys/fs/cgroup:/sys/fs/cgroup:rw trfore/docker-debian12-systemd:latest

• Use it, example:

  dockerexec -it debian12-systemd /bin/bash

• Podman defaults to running containers in systemd mode,--systemd=true, and will mount the required tmpfs and cgroupfilesystem. SeePodman Docs: Commandsrun --systemd for details.

  podman run -d -it --name debian12-systemd docker.io/trfore/docker-debian12-systemd:latest

Taylor Fore (https://github.com/trfore)

Inspired by Jeff Geerling's (@geerlingguy), CentOS 8, Debian 10/11, and Ubuntu 20/22docker images for ansible,geerlingguy/docker-*-ansible.

• https://molecule.readthedocs.io/en/stable/index.html
• https://molecule.readthedocs.io/en/stable/examples.html#systemd-container
• https://developers.redhat.com/blog/2016/09/13/running-systemd-in-a-non-privileged-container
• github runner - ubuntu 20.04 preinstalled software
• github runner - ubuntu 22.04 preinstalled software