Run N instances on Amazon EC2, install nvm, node, npm, PM2 and make sure PM2 will be automatically started in the case of the instance reboot

ansible_nvm_node_npm_pm2.yml

- name: Provision infrastructure
  hosts: localhost
  gather_facts: False

  vars:
    keypair: mykeypair
    instance_type: m4.large
    region: us-west-2
    image: ami-f0091d91

  tasks:
    - name: Launch instances
      ec2:
        key_name: "{{ keypair }}"
        groups: ['SSH']
        instance_type: "{{ instance_type }}"
        region: "{{ region }}"
        image: "{{ image }}"
        wait: yes
        exact_count: 3

        count_tag:
          Name: MY-CLUSTER

        instance_tags:
          Name: MY-CLUSTER

      register: ec2

    - name: Add all tagged instances to host group
      add_host: name={{ item.public_ip }} groups=tagged
      with_items: ec2.tagged_instances

    - name: Wait for SSH to come up
      wait_for: host={{ item.public_dns_name }} port=22 delay=30 timeout=320 state=started
      with_items: ec2.instances

- name: Provision instances
  hosts: tagged
  gather_facts: True
  user: ec2-user

  vars:
    nvm_user: ec2-user
    nvm_user_home: /home/ec2-user
    nvm_user_profile: /home/ec2-user/.bash_profile
    nvm_dir: /home/ec2-user/.nvm
    nvm_version: v0.30.2
    nvm_node_version: 5.4.1

  tasks:
    - name: Update yum packages
      yum: name=* state=latest
      become: true
      become_method: sudo

    - name: Install development tools and libraries
      yum: name="@{{ item }}" state=present
      become: true
      become_method: sudo
      with_items:
        - Development Tools
        - Development Libraries

    - name: Check if nvm installed
      stat: path="{{ nvm_dir }}"
      register: nvm_path
      changed_when: False

    - name: Create nvm folder
      when: not nvm_path.stat.exists
      become: yes
      become_method: sudo
      file: path="{{ nvm_dir }}" owner="{{ nvm_user }}" group="{{ nvm_user }}" mode=755 state=directory

    - name: Install nvm
      when: not nvm_path.stat.exists
      git: repo=https://github.com/creationix/nvm.git dest="{{ nvm_dir }}" version="{{ nvm_version }}"

    - name: Source nvm in {{ nvm_user_profile }}
      lineinfile: dest="{{ nvm_user_profile }}" line='[ -s "{{ nvm_dir }}/nvm.sh" ] && . "{{ nvm_dir }}/nvm.sh"'

    - name: Check installed node version
      command: bash -lc 'nvm ls'
      register: nvm_install_result
      changed_when: False
      ignore_errors: True

    - name: Install nodejs using nvm
      when: nvm_install_result|failed or nvm_install_result.stdout.find('{{ nvm_node_version }}') == -1
      command: bash -lc 'nvm install "{{ nvm_node_version }}"'

    - name: Check the default nodejs version
      command: bash -lc 'nvm ls | grep -e "default -> {{ nvm_node_version }}"'
      register: nvm_check_default
      changed_when: False
      ignore_errors: True

    - name: Set default node version
      when: nvm_check_default|failed
      command: bash -lc 'nvm alias default "{{ nvm_node_version }}"'
      tags: nvm

    - name: Install PM2
      npm: name=pm2 global=yes state=present executable="{{ nvm_dir }}/versions/node/v{{ nvm_node_version }}/bin/npm"
      tags: npm
      
    - name: Ensure PM2 started
      command: bash -lc 'pm2 ping &>/dev/null'

    - name: Check PM2 startup script
      stat: path=/var/lock/subsys/pm2-init.sh
      register: pm2_startup_lock
      changed_when: False

    - name: Get startup initialization script for PM2
      when: not pm2_startup_lock.stat.exists
      command: bash -lc 'pm2 startup "{{ platform }}" | grep -e "sudo su -c" | sed -e "s/^ *//" | sed -E "s/sudo su -c \"(.*)\"/\1/"'
      register: pm2_startup

    - name: Ensure PM2 will start on reboot
      when: not pm2_startup_lock.stat.exists
      become: yes
      become_method: sudo
      command: "{{pm2_startup.stdout}}"
      register: pm2_ensure_startup