How to stop all containers with Ansible

问题

I am trying to stop all running containers as a first step and then remove them.

I know that I can do it using Anslible shell package and run this command:

docker container stop $(docker container ls -aq)

As a second step I can do the same with shell package and clean the dead containers / images / volumes:

docker system prune -a -f --volumes

I have tried something like this (sample of code):

- name: Stop all containers:
  shell: "docker container stop $(docker container ls -aq)"
  ignore_errors: yes

Unfortunately when containers are 0 this throws an error which I would like to handle.

I could improve it by adding the following:

- name: Get info on docker host and list images
  docker_host_info:
    containers: yes
  register: result

- name: Stop all containers
  shell: "docker container stop $(docker container ls -aq)"
  when: result.host_info.Containers != 0

I would like to do it with by using purely an Ansible package e.g. (docker_host_info). I am able to extract a complex list with containers, that include all the information but I can not found a way to get either the Id or name of the containers.

My plan is to make a loop after with the Ids or names and stop them one by one.

I managed to extract the number of containers (string format), but I can not find a way to convert it to index so I can loop through.

Sample of code:

- name: Get info on docker host and list images
  docker_host_info:
    containers: yes
  register: result

- name: Debug dockerInfo
  debug:
    var: result.containers 
    # var: result.host_info.Containers
    # loop: "{{ result.host_info.Containers }}"
    # loop: "{{ range(0, 4)|list }}"
  when: result.host_info.Containers != 0

Is it possible to convert the returned string to an index and iterate through this index e.g. (fake sample of code):

- name: Debug dockerInfo
  debug:
    var: "{{ result.containers[item].Id }}
  loop: result.host_info.Containers
  when: result.host_info.Containers != 0

回答1:

result.containers is a list so you can iterate directly on it:

- name: Debug dockerInfo
  debug:
    var: item
  loop: "{{ result.containers }}"
  when: result.containers | length != 0

BTW, the var of debug only takes a variable name, to debug an expression you have to use msg instead. BTW2, for the loop keyword you must use the curly braces to evaluate the expression.

来源：https://stackoverflow.com/questions/58460180/how-to-stop-all-containers-with-ansible

标签

loops

ansible

containers