setup_vpc_subnets.yml

---  

- name: "setup VPC"
  hosts: localhost
  gather_facts: no
  vars:
    aws_region: us-west-2  # If not specified then the value of the EC2_REGION environment variable, if any, is used.
    # prefix for naming
    prefix: dev

    top_cidr: 10.0.0.0/16

    subnet_block_1: 10.0.0.0/24
    subnet_block_2: 10.0.1.0/24

    # availability zone
    az0: a
    az1: b

    # --purpose choices=['internal', 'external'], help='Purpose of the subnet'
    purpose_subnet: internal
    # --target , choices=['ec2', 'elb'], help='Type of subnet: ec2 or elb.'
    target_subnet: elb

  tasks:
    - name: create vpc
      local_action:
        module: ec2_vpc
        region: "{{ aws_region }}"
        cidr_block: "{{ top_cidr }}"
        resource_tags: '{"Name":"{{ prefix }}_vpc"}'
        subnets:
          - cidr: "{{ subnet_block_1 }}"
            az: "{{ aws_region }}{{ az0 }}"
            resource_tags: '{"Name":"subnet_public","immutable_metadata":"{\"purpose\":\"external\",\"target\":\"{{ target_subnet }}\"}"}'
          - cidr: "{{ subnet_block_2 }}"
            az: "{{ aws_region }}{{ az1 }}"
            resource_tags: '{"Name":"subnet_private","immutable_metadata":"{\"purpose\":\"{{ purpose_subnet }}\",\"target\":\"{{ target_subnet }}\"}"}'

        internet_gateway: yes
        route_tables:
          - subnets:
            - "{{ subnet_block_1 }}"
            routes:
            - dest: 0.0.0.0/0
              gw: igw
      register: vpc

    - name: write vpc id to group_vars/all file
      local_action: shell echo "vpc_id:" "{{ vpc.vpc_id }}" 
                      >>  group_vars/all
    - name: write subnets id to group_vars/all file
      local_action: shell echo "{{ item.resource_tags.Name }}"":" "{{ item.id }}" 
                      >> group_vars/all
      with_items: vpc.subnets