使用 Ansible 重启多个 Docker 容器

Question

how do i dynamically restart all my docker containers from Ansible? I mean i know a way where i can define my containers in a variable and loop through them but what i want to achieve is this -

Fetch the currently running containers and restart all or some of them one by one through some loop.

How to achieve this using Ansible?

Answer 1

Docker explanation

Retrieve name/image for all the running container:

docker container ls -a --format '{{.Names}} {{.Image}}'

You could also filter the output of the docket container command to a specific image name, thanks to the --filter ancestor=image_name option:

docker container ls -a --filter ancestor=alpine --format '{{.Names}} {{.Image}}'

Ansible integration:

First I would define some filters as Ansible variables:

  vars:
    - image_v1: '--filter ancestor=my_image:v1'
    - image_v2: '--filter ancestor=my_image:v2'

Them I will execute the docker container command in a dedicated task and save the command output to an Ansible variable:

 - name: Get images name
   command: docker container ls -a {{ image_v1 }} {{ image_v2 }} --format "{{ '{{' }}.Names {{ '}}' }} {{ '{{' }}.Image {{ '}}' }}"
   register: docker_images

Finally I will iterate over it and use it into the docker_container ansible module:

- name: Restart images
  docker_container:
    name: "{{ item.split(' ')[0]}}"
    image: "{{ item.split(' ')[1]}}"
    state: started
    restart: yes
  loop: "{{ docker_images.stdout_lines}}"

final playbook.yml

---
- hosts: localhost
  gather_facts: no
  vars:
    - image_v1: '--filter ancestor=my_image:v1'
    - image_v2: '--filter ancestor=my_image:v2'
  tasks:
    - name: Get images name
      command: docker container ls -a {{ image_v1 }} {{ image_v2 }} --format "{{ '{{' }}.Names {{ '}}' }} {{ '{{' }}.Image {{ '}}' }}"
      register: docker_images

    - name: Restart images
      docker_container:
        name: "{{ item.split(' ')[0]}}"
        image: "{{ item.split(' ')[1]}}"
        state: started
        restart: yes
      loop: "{{ docker_images.stdout_lines}}"