redis_master_tasks.yaml

---
- hosts: localhost
  gather_facts: no
  become: yes

  tasks:

  - name: Update all packages
    apt:
      update_cache: yes
      upgrade: dist

  - name: Add source key for nodejs
    apt_key:
      url: "https://deb.nodesource.com/gpgkey/nodesource.gpg.key"
      state: present
    register: first_run

  - name: Add source repo for nodejs
    apt_repository:
      repo: "deb https://deb.nodesource.com/node_8.x xenial main"
      state: present
      update_cache: yes
      
  - name: Add Ansible repo
    apt_repository:
      repo: "ppa:ansible/ansible"
      state: present
      update_cache: yes  

  - name: Install packages
    apt:
      name: "{{ item }}"
      state: present
    with_items:
      - nginx
      - mongodb
      - nodejs
      - ansible
      - python-pymongo
      - python-pip
      - redis-server

  - name: install pymongo
    pip:
      name: redis
      state: present

  - name: add mongo user
    mongodb_user:
      database: admin
      name: admin
      password: admin
      roles: userAdminAnyDatabase
      state: present
    #when: first_run|changed

  - name: Restart mongo
    service:
      name: mongodb
      state: restarted
    #when: first_run|changed

  - name: clone checkbox repo
    git:
      repo: https://github.com/thegreyd/checkbox.io
      dest: /home/ubuntu/checkbox
      force: yes
      update: yes

  - name: configure nginx defaults
    copy:
      src: /home/ubuntu/checkbox/local-conf/default
      dest: /etc/nginx/sites-available/default
      force: yes
      remote_src: True
    #when: first_run|changed

  - name: configure nginx conf
    copy:
      src: /home/ubuntu/checkbox/local-conf/nginx.conf
      dest: /etc/nginx/nginx.conf
      force: yes
      remote_src: True
    #when: first_run|changed

  - name: Restart nginx
    service:
      name: nginx
      state: restarted
    #when: first_run|changed

  - name: Replace bind in redis configuration
    replace:
      path: /etc/redis/redis.conf
      regexp: 'bind 127.0.0.1'
      replace: 'bind 0.0.0.0'

  - name: setting this node as master
    redis:
      command: slave
      slave_mode: master

  - name: Start Redis server
    command: redis-server --daemonize yes


  - name: Restart Redis server
    service:
      name: redis-server
      state: restarted


  - name: npm install
    npm:
      path: /home/ubuntu/checkbox/server-side/site/
      state: present

  - name: start node server
    environment:
      MONGO_PORT: 3002
      MONGO_IP: localhost
      MONGO_USER: admin
      MONGO_PASSWORD: admin
    shell: node server.js
    async: 2592000
    poll: 0
    args:
      chdir: /home/ubuntu/checkbox/server-side/site/
...

redis_slave_tasks.yaml

---
- hosts: localhost
  gather_facts: no
  become: yes

  tasks:

  - name: Update all packages
    apt:
      update_cache: yes
      upgrade: dist

  - name: Add source key for nodejs
    apt_key:
      url: "https://deb.nodesource.com/gpgkey/nodesource.gpg.key"
      state: present
    register: first_run

  - name: Add source repo for nodejs
    apt_repository:
      repo: "deb https://deb.nodesource.com/node_8.x xenial main"
      state: present
      update_cache: yes
      
  - name: Add Ansible repo
    apt_repository:
      repo: "ppa:ansible/ansible"
      state: present
      update_cache: yes  

  - name: Install packages
    apt:
      name: "{{ item }}"
      state: present
    with_items:
      - nginx
      - mongodb
      - nodejs
      - ansible
      - python-pymongo
      - python-pip
      - redis-server

  - name: install pymongo
    pip:
      name: redis
      state: present

  - name: add mongo user
    mongodb_user:
      database: admin
      name: admin
      password: admin
      roles: userAdminAnyDatabase
      state: present
    #when: first_run|changed

  - name: Restart mongo
    service:
      name: mongodb
      state: restarted
    #when: first_run|changed

  - name: clone checkbox repo
    git:
      repo: https://github.com/thegreyd/checkbox.io
      dest: /home/ubuntu/checkbox
      force: yes
      update: yes

  - name: configure nginx defaults
    copy:
      src: /home/ubuntu/checkbox/local-conf/default
      dest: /etc/nginx/sites-available/default
      force: yes
      remote_src: True
    #when: first_run|changed

  - name: configure nginx conf
    copy:
      src: /home/ubuntu/checkbox/local-conf/nginx.conf
      dest: /etc/nginx/nginx.conf
      force: yes
      remote_src: True
    #when: first_run|changed

  - name: Restart nginx
    service:
      name: nginx
      state: restarted
    #when: first_run|changed

  - name: Replace bind in redis configuration
    replace:
      path: /etc/redis/redis.conf
      regexp: 'bind 127.0.0.1'
      replace: 'bind 0.0.0.0'

  - name: setting this node as master
    redis:
      command: slave
      master_host: redis_master
      master_port: 6379

  - name: Start Redis server
    command: redis-server --daemonize yes


  - name: Restart Redis server
    service:
      name: redis-server
      state: restarted
      
  - name: Comment set key line in server.js for slave
    replace:
      path: /home/ubuntu/checkbox/server-side/site/server.js
      regexp: 'client.set("key1",1);'
      replace: '//client.set("key1",1);'    


  - name: npm install
    npm:
      path: /home/ubuntu/checkbox/server-side/site/
      state: present

  - name: start node server
    environment:
      MONGO_PORT: 3002
      MONGO_IP: localhost
      MONGO_USER: admin
      MONGO_PASSWORD: admin
    shell: node server.js
    async: 2592000
    poll: 0
    args:
      chdir: /home/ubuntu/checkbox/server-side/site/
...