Retrieving vpc_subnet_id by resource tags

[Lorin Hochstein]

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

[Dan Vaida]

Hi Lorin,

It looks like your question is similar to mine: https://groups.google.com/d/msg/ansible-project/Xy3kt0Mr8YY/eB6TqMN0Y3EJ

Didn't had the time to explore potential fixes yet though...

Perhaps you have some updates from your side.

Cheers,

Dan.