get-subnets

Get EC2 VPC subnet facts based on tags. Use this role to return a list of subnet ID's in a variable subnet_ids that you can then use in other roles. If you are using the Availability Zone tag key, then you can define subnet_has_az_tags to get a the availability zones the subnets are in from the subnet_azs variable. The index in this list will correspond to the index in the subnet_ids variable

Requirements

Ansible 2.3 and boto module are required for this role

Role Variables

Required variables for this role are as follows:

• region: AWS region One of:
  • vpc_name: Name of the vpc
  • vpc_id: AWS VPC identifier.

You can then choose how to get the subnets based on the following variables:

• subnet_name: A list of subnet names; returns the corresponding subnet ID's
• subnet_tier: if defined, the value of {{ subnet_layer }} will be used to match the Tier tag of the subnet. Values could be: application, presentation, data
• subnet_env_tier: If defined, the role will take the variable values for environment and tier to get the list of subnets. You will need to pass in the full name for the Environment as {{ environ }} variable and also the {{ subnet_layer }} variable will be used for the Tier tag.
• environ:
• subnet_has_az_tags: define if you are using Availability zone: tags in your subnets.

Dependencies

No depenencies on other ansible roles

Example Playbook

- hosts: localhost
  vars:
    subnet_tier: true
    subnet_layer: application
    region: us-east-1
    vpc_name: PFE VPC
  roles:
     - role: get-subnets

License

GPL

Author Information

Iain M Conochie iain@shihad.org

Bugs

Playbook fails in role at set_fact task with error: the field 'args' has an invalid value, which appears to include a variable that is undefined.

Check your seubnet names; if the role is unable to locate your subnets, there will be no results and the role will fail