Ansible: Creating ec2 instance (ubuntu) and adding it to host groups

create-ec2-instance.yml

---
- name: creating an instance in AWS using default VPC and Security Group
  hosts: localhost
  vars:
    instance_info:
      - name: "< instance name >"
        image: "ami-835b4efa" # Ubuntu 14.04
        group_id: '<security-group>'
        region: '<region-name' #us-west-2, ap-northeast-1
        instance_type: '< instance type >' # t2.micro, mx.xlarge etc
        key_name: '<key-name>'
        vpc_subnet_id: '< subnet-id >'
        count: <count> #no of servers to create 
  tasks:
    - name: Creating the instance
      ec2:
        group_id: "{{ item.group_id }}"
        region: "{{ item.region }}"
        aws_access_key: "{{ lookup('env', 'AWS_ACCESS_KEY_ID') }}"
        aws_secret_key: "{{ lookup('env', 'AWS_SECRET_ACCESS_KEY') }}"
        image: '{{ item.image }}'
        instance_type: "{{ item.instance_type }}"
        key_name: "{{ item.key_name }}"
        state: present
        assign_public_ip: true
        count: '{{ item.count }}'
        instance_tags:
          Name: '< instance-tage >'
        vpc_subnet_id: '{{ item.vpc_subnet_id }}'
        wait: yes #wait for the instance state to become running
      register: ec2
      with_items: instance_info

    - name: Add hosts group temporary inventory group with pem path
      add_host:
        name: "{{ item.public_ip }}"
        groups: dynamic_hosts
        ansible_user: ubuntu
      with_items: "{{ instance_info.instances[0:] }}"
      
- hosts: dynamic_hosts
  become: true
  remote_user: ubuntu
  roles:
  - < roles >