Restart multiple Docker containers using Ansible - docker

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}}"