elb_target_facts – Gathers which target groups a target is associated with

• Synopsis
• Requirements
• Parameters
• Notes
• Examples
• Return Values
• Status

Synopsis

• This module will search through every target group in a region to find which ones have registered a given instance ID or IP.

Requirements

The below requirements are needed on the host that executes this module.

• boto
• boto3
• botocore
• python >= 2.6

Parameters

Notes

Examples

# practical use case - dynamically deregistering and reregistering nodes

  - name: Get EC2 Metadata
    action: ec2_metadata_facts

  - name: Get initial list of target groups
    delegate_to: localhost
    elb_target_facts:
      instance_id: "{{ ansible_ec2_instance_id }}"
      region: "{{ ansible_ec2_placement_region }}"
    register: target_facts

  - name: save fact for later
    set_fact:
      original_tgs: "{{ target_facts.instance_target_groups }}"

  - name: Deregister instance from all target groups
    delegate_to: localhost
    elb_target:
        target_group_arn: "{{ item.0.target_group_arn }}"
        target_port: "{{ item.1.target_port }}"
        target_az: "{{ item.1.target_az }}"
        target_id: "{{ item.1.target_id }}"
        state: absent
        target_status: "draining"
        region: "{{ ansible_ec2_placement_region }}"
    with_subelements:
      - "{{ original_tgs }}"
      - "targets"

    # This avoids having to wait for 'elb_target' to serially deregister each
    # target group.  An alternative would be to run all of the 'elb_target'
    # tasks async and wait for them to finish.

  - name: wait for all targets to deregister simultaneously
    delegate_to: localhost
    elb_target_facts:
      get_unused_target_groups: false
      instance_id: "{{ ansible_ec2_instance_id }}"
      region: "{{ ansible_ec2_placement_region }}"
    register: target_facts
    until: (target_facts.instance_target_groups | length) == 0
    retries: 60
    delay: 10

  - name: reregister in elbv2s
    elb_target:
      region: "{{ ansible_ec2_placement_region }}"
      target_group_arn: "{{ item.0.target_group_arn }}"
      target_port: "{{ item.1.target_port }}"
      target_az: "{{ item.1.target_az }}"
      target_id: "{{ item.1.target_id }}"
      state: present
      target_status: "initial"
    with_subelements:
      - "{{ original_tgs }}"
      - "targets"

  # wait until all groups associated with this instance are 'healthy' or
  # 'unused'
  - name: wait for registration
    elb_target_facts:
      get_unused_target_groups: false
      instance_id: "{{ ansible_ec2_instance_id }}"
      region: "{{ ansible_ec2_placement_region }}"
    register: target_facts
    until: (target_facts.instance_target_groups |
            map(attribute='targets') |
            flatten |
            map(attribute='target_health') |
            rejectattr('state', 'equalto', 'healthy') |
            rejectattr('state', 'equalto', 'unused') |
            list |
            length) == 0
    retries: 61
    delay: 10

# using the target groups to generate AWS CLI commands to reregister the
# instance - useful in case the playbook fails mid-run and manual
#            rollback is required
  - name: "reregistration commands: ELBv2s"
    debug:
      msg: >
             aws --region {{ansible_ec2_placement_region}} elbv2
             register-targets --target-group-arn {{item.target_group_arn}}
             --targets{%for target in item.targets%}
             Id={{target.target_id}},
             Port={{target.target_port}}{%if target.target_az%},AvailabilityZone={{target.target_az}}
             {%endif%}
             {%endfor%}
    loop: "{{target_facts.instance_target_groups}}"

Return Values

Common return values are documented here, the following are the fields unique to this module:

Status

• This module is not guaranteed to have a backwards compatible interface. [preview]
• This module is maintained by the Ansible Community. [community]

Authors

• Yaakov Kuperman (@yaakov-github)