Let's say I create an ec2 vpc like this:

  tasks:
  - name: create a vpc
    ec2_vpc:
      internet_gateway: True
      resource_tags: { env: production }
      cidr_block: 10.0.0.0/16
      subnets:
        - cidr: 10.0.0.0/24
          resource_tags:
            env: production
            tier: web
        - cidr: 10.0.1.0/24
          resource_tags:
            env: production
            tier: db
      route_tables:
        - subnets:
          - 10.0.0.0/24
          - 10.0.1.0/24
          routes:
          - dest: 0.0.0.0/0
            gw: igw
    register: vpc


Later in the play, I want to create an instance inside of subnet 
10.0.0.0/24 (web tier):

    ec2:
      image: "{{ ubuntu_image.ami }}"
      instance_type: "{{ instance_type }}"
      assign_public_ip: True
      key_name: mykey
      group: [web, ssh]
      instance_tags: { type: web, env: production }
      exact_count: "{{ count }}"
      count_tag: { type: web }
      vpc_subnet_id: "{{ vpc.subnets[0].id}}"

Is vpc.subnets[0] guaranteed to correspond to the first subnet that was 
created (10.0.0.0/24)? If not, is there a way I can specify "the vpc subnet 
that corresponds to resource tag {env: production, tier: web}?"


Lorin

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