I am aware of community.docker.docker_container_info where one can mention the name of the container and obtain information about it. However I cannot find any information on what is the equivalent to obtaining a list of currently running containers on the device.
My goal is to perform a complete prune of the device, however the community.docker.docker_prune only provides pruning of non-running containers.
The only solution I have at the moment is:
- name: '(DEVICE) - Running Containers Information'
ansible.builtin.command:
cmd: docker ps -a --format=json
register: running_containers_info
changed_when: running_containers_info.rc != 0
- debug: msg="{{ item | from_json }}"
loop: "{{ running_containers_info.stdout_lines }}"
- community.docker.docker_container:
name: "{{ container_info.Names }}"
state: absent
vars:
container_info: "{{ item | from_json }}"
loop: "{{ running_containers_info.stdout_lines }}"
- name: '(DEVICE) - Prune system'
community.docker.docker_prune:
containers: true
images: true
images_filters:
dangling: false
networks: true
builder_cache: true
because docker ps -a --format=json provides distinct JSON structures as opposed to a list of JSON, this is why I need to format from from_json gymnastics in the middle.
That looks fine to me, one thing I’d do differently though is this:
- name: '(DEVICE) - Running Containers Information'
ansible.builtin.command:
cmd: docker ps -a --format=json
register: running_containers_info
changed_when: false # 👈
As running this command doesn’t change anything.
I’d probably also set a fact for the docker ps -a --format=json output with a dict2items filter and then loop on that, but the way you have done it is fine, if it works 
.
Or simply use the community.docker.docker_host_info module with containers=true and containers_all=true instead of using the command module.
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