gce_mig – Create, Update or Destroy a Managed Instance Group (MIG)

Synopsis

• Create, Update or Destroy a Managed Instance Group (MIG). See https://cloud.google.com/compute/docs/instance-groups for an overview. Full install/configuration instructions for the gce* modules can be found in the comments of ansible/test/gce_tests.py.

Requirements

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

• python >= 2.6

• apache-libcloud >= 1.2.0

Parameters

Parameter	Choices/Defaults	Comments
autoscaling -		A dictionary of configuration for the autoscaler. 'enabled (bool)', 'name (str)' and policy.max_instances (int) are required fields if autoscaling is used. See credentials_file -		Path to the JSON file associated with the service account email
name - / required		Name of the Managed Instance Group.
named_ports -		Define named ports that backend services can forward data to. Format is a a list of name:port dictionaries.
project_id -		GCE project ID
service_account_email -		service account email
size -		Size of Managed Instance Group. If MIG already exists, it will be resized to the number provided here. Required for creating MIGs.
state -	Choices: absent present ←	desired state of the resource
template -		Instance Template to be used in creating the VMs. See zone - / required		The GCE zone to use for this Managed Instance Group.

Notes

Note

• Resizing and Recreating VM are also supported.

• An existing instance template is required in order to create a Managed Instance Group.

Examples

# Following playbook creates, rebuilds instances, resizes and then deletes a MIG.
# Notes:
# - Two valid Instance Templates must exist in your GCE project in order to run
#   this playbook.  Change the fields to match the templates used in your
#   project.
# - The use of the 'pause' module is not required, it is just for convenience.
- name: Managed Instance Group Example
  hosts: localhost
  gather_facts: False
  tasks:
    - name: Create MIG
      gce_mig:
        name: ansible-mig-example
        zone: us-central1-c
        state: present
        size: 1
        template: my-instance-template-1
        named_ports:
        - name: http
          port: 80
        - name: foobar
          port: 82

    - name: Pause for 30 seconds
      pause:
        seconds: 30

    - name: Recreate MIG Instances with Instance Template change.
      gce_mig:
        name: ansible-mig-example
        zone: us-central1-c
        state: present
        template: my-instance-template-2-small
        recreate_instances: yes

    - name: Pause for 30 seconds
      pause:
        seconds: 30

    - name: Resize MIG
      gce_mig:
        name: ansible-mig-example
        zone: us-central1-c
        state: present
        size: 3

    - name: Update MIG with Autoscaler
      gce_mig:
        name: ansible-mig-example
        zone: us-central1-c
        state: present
        size: 3
        template: my-instance-template-2-small
        recreate_instances: yes
        autoscaling:
          enabled: yes
          name: my-autoscaler
          policy:
            min_instances: 2
            max_instances: 5
            cool_down_period: 37
            cpu_utilization:
              target: .39
            load_balancing_utilization:
              target: 0.4

    - name: Pause for 30 seconds
      pause:
        seconds: 30

    - name: Delete MIG
      gce_mig:
        name: ansible-mig-example
        zone: us-central1-c
        state: absent
        autoscaling:
          enabled: no
          name: my-autoscaler

Return Values

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

Key	Returned	Description
created_autoscaler boolean	When the creation of an Autoscaler was attempted.	True if Autoscaler was attempted and created. False otherwise. Sample: True
created_instances list	When instances are created.	Names of instances created. Sample: ['ansible-mig-new-0k4y', 'ansible-mig-new-0zk5', 'ansible-mig-new-kp68']
deleted_autoscaler boolean	When the delete of an Autoscaler was attempted.	True if an Autoscaler delete attempted and succeeded. False returned if delete failed. Sample: True
deleted_instances list	When instances are deleted.	Names of instances deleted. Sample: ['ansible-mig-new-0k4y', 'ansible-mig-new-0zk5', 'ansible-mig-new-kp68']
name string	changed	Name of the Managed Instance Group. Sample: my-managed-instance-group
named_ports list	when named_ports are initially set or updated	list of named ports acted upon Sample: [{'name': 'http', 'port': 80}, {'name': 'foo', 'port': 82}]
recreated_instances list	When instances are recreated.	Names of instances recreated. Sample: ['ansible-mig-new-0k4y', 'ansible-mig-new-0zk5', 'ansible-mig-new-kp68']
resize_created_instances list	When a resize results in the creation of instances.	Names of instances created during resizing. Sample: ['ansible-mig-new-0k4y', 'ansible-mig-new-0zk5', 'ansible-mig-new-kp68']
resize_deleted_instances list	When a resize results in the deletion of instances.	Names of instances deleted during resizing. Sample: ['ansible-mig-new-0k4y', 'ansible-mig-new-0zk5', 'ansible-mig-new-kp68']
set_named_ports boolean	named_ports have been set	True if the named_ports have been set Sample: True
size integer	changed	Number of VMs in Managed Instance Group. Sample: 4
template string	changed	Instance Template to use for VMs. Must exist prior to using with MIG. Sample: my-instance-template
updated_autoscaler boolean	When the update of an Autoscaler was attempted.	True if an Autoscaler update was attempted and succeeded. False returned if update failed. Sample: True
updated_named_ports boolean	named_ports have been updated	True if the named_ports have been updated Sample: True
zone string	always	Zone in which to launch MIG. Sample: us-central1-b

Status

• This module is not guaranteed to have a backwards compatible interface. [preview]

• This module is maintained by the Ansible Community. [community]

Authors

• Tom Melendez (@supertom) <tom@supertom.com>

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