systemd-python docker images

The systemd-python enabled docker images defined here can be found on dockerhub.

Status

Directory structure

• aports-dev contains an image for Alpine Linux aports development.
• openrc and systemd contain init-enabled docker images in which services are able to run.

Run molecule tests

The example below uses ansible-datacenter molecule tests

$ git clone https://github.com/lj020326/ansible-datacenter.git
$ cd ansible-datacenter
$ ## NOTE: registry default is docker.io
$ export MOLECULE_IMAGE_REGISTRY=registry.example.int:5000
$ export MOLECULE_IMAGE_LABEL=redhat7-systemd-python
$ molecule login
$ molecule --debug test -s bootstrap-linux-package
$ molecule destroy
$ MOLECULE_IMAGE_LABEL=redhat8-systemd-python molecule --debug test -s bootstrap-linux-package
$ MOLECULE_IMAGE_LABEL=redhat8-systemd-python molecule login
$ molecule destroy
$ MOLECULE_IMAGE_LABEL=redhat8-systemd-python molecule converge
$ molecule destroy
$ MOLECULE_IMAGE_LABEL=centos8-systemd-python molecule --debug converge
$ molecule destroy
$ MOLECULE_IMAGE_LABEL=ubuntu2204-systemd-python molecule --debug converge

To log into container

$ MOLECULE_IMAGE_LABEL=redhat8-systemd-python molecule create
$ MOLECULE_IMAGE_LABEL=redhat8-systemd-python molecule login
$ molecule destroy

To log into pure public docker images:

docker exec -it lj020326/centos9-systemd:latest bash
docker exec -it lj020326/centos9-systemd-python:latest bash

To log into pure private docker image:

$ importsslcert media.johnson.int:5000
$ docker login media.johnson.int:5000
$ docker pull media.johnson.int:5000/centos9-systemd:latest
## Run the systemd container as a daemon
$ docker run -d --name centos9-systemd --privileged --tmpfs /tmp --tmpfs /run --tmpfs /run/lock -v /sys/fs/cgroup:/sys/fs/cgroup:ro media.johnson.int:5000/centos9-systemd
$ docker exec -it centos9-systemd bash
## run the python enabled systemd container image
$ docker run -d --name centos9-systemd-python --tmpfs /tmp --tmpfs /run --tmpfs /run/lock -v /sys/fs/cgroup:/sys/fs/cgroup:ro media.johnson.int:5000/centos9-systemd-python
$ docker exec -it centos9-systemd-python bash

To override entrypoint and run bash instead:

$ docker run -it --name centos9-systemd --entrypoint /bin/bash --privileged --tmpfs /tmp --tmpfs /run --tmpfs /run/lock -v /sys/fs/cgroup:/sys/fs/cgroup:ro media.johnson.int:5000/centos9-systemd

Building images

To build an image using centos9-systemd as an example:

$ cd systemd/centos/
$ docker build -t centos9-systemd --build-arg IMAGE_REGISTRY=media.johnson.int:5000 -f 9.Dockerfile .

To build image from project root:

$ docker build -t redhat9-systemd-python \
  --build-arg IMAGE_REGISTRY=media.johnson.int:5000 \
  -f systemd/redhat/9.python.Dockerfile \
  systemd/redhat/

If you want to start a debug session when a build fails, you can use --on=error to start a debug session when the build fails.

To build in debug mode:

$ export BUILDX_EXPERIMENTAL=1
$ docker buildx debug --on=error build -t redhat9-systemd-python \
  --build-arg IMAGE_REGISTRY=media.johnson.int:5000 \
  -f systemd/redhat/9.python.Dockerfile \
  systemd/redhat/

To build an image using centos9-systemd as an example:

$ cd centos/
$ docker build -t centos9-systemd --build-arg IMAGE_REGISTRY=media.johnson.int:5000 -f 9.Dockerfile .
$ docker build -t centos9-systemd-python --build-arg IMAGE_REGISTRY=media.johnson.int:5000 -f 9.python.Dockerfile .
$ cd ../debian
$ docker build -t debian8-systemd-python --build-arg IMAGE_REGISTRY=media.johnson.int:5000 -f 8.python.Dockerfile .

Running bash in image

To run bash in newly built image:

## if testing the locally built image
$ docker run --rm -it centos8-systemd bash -il
## if testing the image pushed to the registry
$ docker run --rm -it media.johnson.int:5000/centos8-systemd bash -il

Reference

• https://github.com/docker-library/docker/blob/master/dockerd-entrypoint.sh
• https://github.com/docker-library/docker/blob/master/docker-entrypoint.sh
• https://github.com/docker-library/docker/blob/master/Dockerfile-dind-rootless.template

Contact