Documentation

elb_target_facts - Gathers which target groups a target is associated with.

New in version 2.7.

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

Parameter Choices/Defaults Comments
aws_access_key
AWS access key. If not set then the value of the AWS_ACCESS_KEY_ID, AWS_ACCESS_KEY or EC2_ACCESS_KEY environment variable is used.

aliases: ec2_access_key, access_key
aws_secret_key
AWS secret key. If not set then the value of the AWS_SECRET_ACCESS_KEY, AWS_SECRET_KEY, or EC2_SECRET_KEY environment variable is used.

aliases: ec2_secret_key, secret_key
ec2_url
Url to use to connect to EC2 or your Eucalyptus cloud (by default the module will use EC2 endpoints). Ignored for modules where region is required. Must be specified for all other modules if region is not used. If not set then the value of the EC2_URL environment variable, if any, is used.
get_unused_target_groups
bool
    Choices:
  • no
  • yes ←
Whether or not to get target groups not used by any load balancers.
instance_id
str

required
What instance ID to get facts for.
profile
(added in 1.6)
Uses a boto profile. Only works with boto >= 2.24.0.
region
The AWS region to use. If not specified then the value of the AWS_REGION or EC2_REGION environment variable, if any, is used. See http://docs.aws.amazon.com/general/latest/gr/rande.html#ec2_region

aliases: aws_region, ec2_region
security_token
(added in 1.6)
AWS STS security token. If not set then the value of the AWS_SECURITY_TOKEN or EC2_SECURITY_TOKEN environment variable is used.

aliases: access_token
validate_certs
bool

(added in 1.5)
    Choices:
  • no
  • yes ←
When set to "no", SSL certificates will not be validated for boto versions >= 2.6.0.

Notes

Note

  • If parameters are not set within the module, the following environment variables can be used in decreasing order of precedence AWS_URL or EC2_URL, AWS_ACCESS_KEY_ID or AWS_ACCESS_KEY or EC2_ACCESS_KEY, AWS_SECRET_ACCESS_KEY or AWS_SECRET_KEY or EC2_SECRET_KEY, AWS_SECURITY_TOKEN or EC2_SECURITY_TOKEN, AWS_REGION or EC2_REGION
  • Ansible uses the boto configuration file (typically ~/.boto) if no credentials are provided. See https://boto.readthedocs.io/en/latest/boto_config_tut.html
  • AWS_REGION or EC2_REGION can be typically be used to specify the AWS region, when required, but this can also be configured in the boto config file

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%}
    with_items: "{{target_facts.instance_target_groups}}"

Return Values

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

Key Returned Description
instance_target_groups
complex
always
a list of target groups to which the instance is registered to

  target_group_arn
string
always
The ARN of the target group

Sample:
['arn:aws:elasticloadbalancing:eu-west-1:111111111111:targetgroup/target-group/deadbeefdeadbeef']
  targets
complex
always
A list of targets that point to this instance ID

    target_id
str
always
the target ID referiing to this instance

Sample:
['i-deadbeef', '1.2.3.4']
    target_az
str
when an AZ is associated with this instance
which availability zone is explicitly associated with this target

Sample:
['us-west-2a']
    target_port
str
always
which port this target is listening on

Sample:
[80]
    target_health
complex
always
      reason
if state!=healthy
reason code for target health

Sample:
['Target.Deregistration in progress']
      description
if state!=present
description of target health

Sample:
['Target desregistration is in progress']
      state
always
health state

Sample:
['healthy', 'draining', 'initial', 'unhealthy', 'unused', 'unavailable']
  target_group_type
string
always
Which target type is used for this group

Sample:
['ip', 'instance']


Status

This module is flagged as preview which means that it is not guaranteed to have a backwards compatible interface.

Maintenance

This module is flagged as community which means that it is maintained by the Ansible Community. See Module Maintenance & Support for more info.

For a list of other modules that are also maintained by the Ansible Community, see here.

Author

  • Yaakov Kuperman (@yaakov-github)

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