Using Ansible with Docker to Deploy a Wordpress Service on Rancher

[Rancher]
rancher ansible_ssh_port=22 ansible_ssh_host=x.x.x.x

[nodes:children]
application
database

[application]
node1 ansible_ssh_port=22 ansible_ssh_host=y.y.y.y

[database]
node2 ansible_ssh_port=22 ansible_ssh_host=z.z.z.z

---
# play 1
- name: Installing and configuring Docker
  hosts: all
  sudo: yes
  roles:
    - { role: docker, tags: ["docker"] }

# play 2
- name: Setting up Rancher Server
  hosts: "rancher"
  sudo: yes
  roles:
    - { role: rancher, tags: ["rancher"] }

# play 3
- name: Register Rancher Hosts
  hosts: "nodes"
  sudo: yes
  roles:
    - { role: rancher_reg, tags: ["rancher_reg"] }

# play 4
- name: Deploy MySQL Container
  hosts: 'database'
  sudo: yes
  roles:
      - { role: mysql_docker, tags: ["mysql_docker"] }

# play 5
- name: Deploy Wordpress App
  hosts: "application"
  sudo: yes
  roles:
    - { role: wordpress_docker, tags: ["wordpress_docker"] }

- name: Fail if OS distro is not Ubuntu 14.04
  fail:
      msg="The role is designed only for Ubuntu 14.04"
  when: "{{ ansible_distribution_version | version_compare('14.04', '!=') }}"

- name: Install dependencies
  apt:
      name={{ item }}
      update_cache=yes
  with_items:
      - python-dev
      - python-setuptools

- name: Install pip
  easy_install:
      name=pip

- name: Install docker-py
  pip:
      name=docker-py
      state=present
      version=1.1.0

- name: Add docker apt repo
  apt_repository:
      repo='deb https://apt.dockerproject.org/repo ubuntu-{{ ansible_distribution_release }} main'
      state=present

- name: Import the Docker repository key
  apt_key:
      url=https://apt.dockerproject.org/gpg
      state=present
      id=2C52609D

- name: Install Docker package
  apt:
      name=docker-engine
      update_cache=yes

- name: Create a docker group
  group:
      name=docker
      state=present

- name: Add user(s) to docker group
  user:
      name={{ item }}
      group=docker
      state=present
  with_items: docker_users
  when: docker_users is defined

- name: Configure Docker
  template:
      src=default_docker.j2
      dest=/etc/default/docker
      mode=0644
      owner=root
      group=root
  notify: restart docker

# Docker Upstart and SysVinit configuration file

# Use DOCKER_OPTS to modify the daemon startup options.
{% if docker_opts is defined %}
DOCKER_OPTS="{{ docker_opts | join(' ')}}"
{% endif %}

---
- name: Pull and run the Rancher/server container
  docker:
      name: "{{ rancher_name }}"
      image: rancher/server
      restart_policy: always
      ports:
        - "{{ rancher_port }}:8080"

- name: Wait for the Rancher server to start
  action: command docker logs {{ rancher_name }}
  register: rancher_logs
  until: rancher_logs.stdout.find("Listening on") != -1
  retries: 30
  delay: 10

- name: Print Rancher's URL
  debug: msg="You can connect to rancher server http://{{ ansible_default_ipv4.address }}:{{ rancher_port }}"

---
- name: Install httplib2
  apt:
      name=python-httplib2
      update_cache=yes

- name: Get the default project id
   action: uri
       method=GET
       status_code=200
       url="http://{{ rancher_server }}:{{ rancher_port }}/v1/projects" return_content=yes
   register: project_id

- name: Return the registration token URL of Rancher server
  action: uri
      method=POST
      status_code=201
      url="http://{{ rancher_server }}:{{ rancher_port }}/v1/registrationtokens?projectId={{ project_id.json['data'][0]['id'] }}" return_content=yes
  register: rancher_token_url

- name: Return the registration URL of Rancher server
  action: uri
      method=GET
      url={{ rancher_token_url.json['links']['self'] }} return_content=yes
  register: rancher_token

- name: Check if the rancher-agent is running
  command: docker ps -a
  register: containers

- name: Register the Host machine with the Rancher server
  docker:
      image: rancher/agent:v{{ rancher_agent_version }}
      privileged: yes
      detach: True
      volumes: /var/run/docker.sock:/var/run/docker.sock
      command: "{{ rancher_token.json['registrationUrl'] }}"
      state: started
  when: "{{ 'rancher-agent' not in containers.stdout }}"

- name: Create a mysql docker container
  docker:
      name: mysql
      image: mysql:{{ mysql_version }}
      detach: True
      env: RANCHER_NETWORK=true,
           MYSQL_ROOT_PASSWORD={{ mysql_root_password }}

- name: Wait a few minutes for the IPs to be set to the container
  wait_for: timeout=120

# The following tasks help with the connection of the containers in different hosts in Rancher
- name: Fetch the MySQL Container IP
  shell: docker exec mysql ip -o -4 addr list eth0 | awk '{print $4}' | cut -d/ -f1 |  sed -n 2p
  register: mysql_sec_ip

- name: print the mysql rancher's ip
  debug: msg={{ mysql_sec_ip.stdout }}

- name: Create a wordpress docker container
  docker:
      name: wordpress
      image: wordpress:{{ wordpress_version }}
      detach: True
      ports:
      - 80:80
      env: RANCHER_NETWORK=true,
         WORDPRESS_DB_HOST={{ mysql_host }}:3306,
         WORDPRESS_DB_PASSWORD={{ mysql_root_password }},
         WORDPRESS_AUTH_KEY={{ wordpress_auth_key }},
         WORDPRESS_SECURE_AUTH_KEY={{ wordpress_secure_auth_key }},
         WORDPRESS_LOGGED_IN_KEY={{ wordpress_logged_in_key }},
         WORDPRESS_NONCE_KEY={{ wordpress_nonce_key }},
         WORDPRESS_AUTH_SALT={{ wordpress_auth_salt }},
         WORDPRESS_SECURE_AUTH_SALT={{ wordpress_secure_auth_salt }},
         WORDPRESS_NONCE_SALT={{ wordpress_nonce_salt }},
         WORDPRESS_LOGGED_IN_SALT={{ wordpress_loggedin_salt }}

├── group_vars
│   ├── all.yml
│   ├── nodes.yml
│   └── Rancher.yml
├── hosts
├── rancher.yml
├── README.md
└── roles
    ├── docker
    ├── mysql_docker
    ├── rancher
    ├── rancher_reg
    └── wordpress_docker

---
rancher_server: "{{ hostvars['rancher']['ansible_ssh_host'] }}"

# MySQL variables
mysql_root_password: "{{ lookup('password', mysql_passwd_tmpfile + ' length=20 chars=ascii_letters,digits') }}"
mysql_passwd_tmpfile: /tmp/mysqlpasswd.file
mysql_host: "{{ hostvars.node2.mysql_sec_ip.stdout }}"
mysql_port: 3306
mysql_version: 5.5

# Wordpress variables
wordpress_version: latest

$ ansible-playbook -u root -i hosts rancher.yml

Using Ansible with Docker to Deploy a Wordpress Service on Rancher

Preparing the Playbook

Docker role

Rancher role

Rancher Registration Role

MySQL and Wordpress Roles

Managing Variables

Running the Playbook

Conclusion