Ansible docker rolling deploy

Ansible docker rolling deploy.md

Ansible rolling update using docker

Include docker-deploy.yml:

[...]
- name: "Deploying {{ service_name }} "
  hosts: "{{ service_name }}"
  serial: 1
  max_fail_percentage: 50
  tasks: 
  - include: docker-deploy.yml
[...]

Copy the wait_for_service.yml and docker-deploy.yml into the service deploy scripts belonging to each service (or parameterize further to make it general for all of your services).

docker-deploy.yml

---
- name: install vimond-eventservice image
  docker:
    name:     example-service
    image:    example.org/example-service:{{ version }}
    pull:           "{{ docker_pull | d('always') }}"
    state:          reloaded
    restart_policy: always
    publish_all_ports: "true"
  register: docker

# This include has a dependency on the `docker` result variable from the docker task above.
# It also assumes that there are two ports that can be used for health-checks worth waiting for 8080 and 8081
- include: wait_for_service.yml
  checks:
    - port: 8080
      check: "/version"
    - port: 8081
      check: "/healthcheck?pretty=true"
  when: docker | changed

wait_for_service.yml

---
- set_fact:
    docker_host_local: "{{ docker_host | d('localhost') }}"
  when: docker | changed

- set_fact:
    real_port: "{{ docker.ansible_facts.docker_containers[0].NetworkSettings.Ports[(item.port | string)+'/tcp'][0].HostPort}}"
  with_items: checks
  register: real_ports
  when: docker | changed

- debug: var=real_ports
  when: debug is defined

- set_fact:
    real_check: "http://{{ docker_host_local }}:{{ item.ansible_facts.real_port }}{{ item.item.check }}"
  with_items: real_ports.results
  register: real_checks
  when: (docker | changed) and real_ports.results is defined


- debug: var=real_checks
  when: debug is defined


- wait_for: host={{ docker_host_local }} port={{ item.ansible_facts.real_port }} timeout=30
  with_items: real_ports.results
  when: (docker | changed) and real_ports.results is defined
  tags:
    - wait_for_ports
    - wait_for_service


- name: Wait until health check is ok
  uri: url={{ item.ansible_facts.real_check }}
  register: result
  until:  result.status is defined and result.status == 200
  retries: 12
  delay: 5
  changed_when: false
  with_items: real_checks.results
  when: (docker | changed) and real_checks.results is defined
  tags:
    - wait_for_healthchecks
    - wait_for_service

- debug: var=result
  when: debug is defined