Ansible Skeleton

app.yml

---
# file: roles/app/tasks/main.yml

- name: ensure logging directory exists
  file: path=/var/log/acme state=directory
  tags:
    - install

- name: ensure config directory exists
  file: path=/etc/acme/app state=directory
  tags:
    - install

- name: download image
  shell: docker pull acme/app
  tags:
    - install

- name: copy environment config
  template: src=../files/config.env dest=/etc/acme/app/config.env
  tags:
    - install
    - update
    - copy

# Must be run with --tags=install first, or this will hang forever
- name: Wait for backup server to be up
  wait_for: host={{ ansible_ssh_host }} port={{ app_port + 1 }} state=started timeout=80
  tags:
    - update

- name: update image
  shell: docker pull acme/app
  tags:
    - update

- name: kill app
  shell: docker stop app && docker rm app
  tags:
    - update
    - rollback
    - stop
    - restart

- name: start app
  shell: docker run
    --restart on-failure
    -v /var/log/acme:/var/log/acme
    -p {{ app_port }}:{{ app_port }}
    --env-file=/etc/acme/app/config.env
    --name app
    -d
    -t acme/app:{{ version | default('latest') }}
  tags:
    - update
    - rollback
    - start
    - restart

- name: Wait for main server to be up
  wait_for: host={{ ansible_ssh_host }} port={{ app_port }} state=started timeout=80
  tags:
    - update
    - rollback

- name: kill app backup
  shell: docker stop app-backup && docker rm app-backup
  tags:
    - update
    - rollback
    - stop-backup
    - restart-backup

- name: start app backup
  shell: docker run
    --restart on-failure
    -v /var/log/acme:/var/log/acme
    -p {{ app_port + 1 }}:{{ app_port }}
    --env-file=/etc/acme/app/config.env
    --name app-backup
    -d
    -t acme/app:{{ version | default('latest') }}
  tags:
    - update
    - rollback
    - start-backup
    - restart-backup

docker.yml

---
# file: roles/docker/tasks/main.yml

- name: add docker apt key
  apt_key: keyserver=hkp://keyserver.ubuntu.com:80 id=36A1D7869245C8950F966E92D8576A8BA88D21E9

- name: add docker apt repo
  apt_repository: repo='deb https://get.docker.io/ubuntu docker main'

- name: update apt and install docker
  apt: name=lxc-docker update_cache=yes

- name: install pip
  apt: name=python-pip

- name: fix pip, because for some reason its broken on apt
  shell: easy_install -U pip

- name: pip install docker-py
  pip: name=docker-py

- name: login to registry
  shell: docker login -u USERNAME -p PASSWORD -e EMAIL@EMAIL.EMAIL

# Will error if no dangling containers
- name: clean up docker containers
  shell: docker rm $(docker ps -aq)
  ignore_errors: yes
  tags:
    - update

# Will error if no dangling images
- name: clean up docker images
  shell: docker rmi $(docker images -f "dangling=true" -q)
  ignore_errors: yes
  tags:
    - update