rolling_update.yml

---
- hosts: all

  pre_tasks:
    - name: Copy maintenance setup
      copy:
        src: rolling_update/maintenance
        dest: "{{ app_home }}"

  tasks:
    - name: Pull latest app image
      shell: docker pull skyderby/app:latest

    - name: Stop web-server
      shell: docker-compose stop web
      args:
        chdir: "{{ app_home }}"

    - name: Remove maintenance web-server if present
      shell: docker rm -f nginx-maintenance
      ignore_errors: yes

    - name: Deploy maintenance web-server
      shell: >
        docker run -d
        -p 80:80 -p 443:443
        --volume {{ app_home }}/maintenance/nginx.conf:/etc/nginx/nginx.conf:ro
        --volume {{ app_home }}/maintenance/maintenance.html:/opt/app/maintenance.html:ro
        --volume {{ app_home }}/ssl:/etc/pki/nginx:ro
        --volume /etc/letsencrypt:/etc/letsencrypt:ro
        --name nginx-maintenance
        nginx:stable
      args:
        chdir: "{{ app_home }}"

    - name: Stop app and workers containers
      shell: docker-compose stop app workers
      args:
        chdir: "{{ app_home }}"

    - name: Remove app and workers containers
      shell: docker-compose rm -v -f app workers
      args:
        chdir: "{{ app_home }}"

    - name: Deploy new version
      shell: docker-compose up --no-deps --force-recreate -d app workers
      args:
        chdir: "{{ app_home }}"

    - name: Wait app to start
      shell: 'docker-compose exec -T app curl --fail http://127.0.0.1:8000/ping || exit 1'
      register: result
      until: result|success
      retries: 30
      delay: 1
      changed_when: False
      args:
        chdir: "{{ app_home }}"

    - name: Remove maintenance web-server
      shell: docker rm -f -v nginx-maintenance

    - name: Starting web-server
      shell: docker-compose up -d --no-deps web
      args:
        chdir: "{{ app_home }}"

    - name: Clean old images
      shell: docker rmi $(docker images --filter "dangling=true" -q --no-trunc)
      ignore_errors: yes