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

Synopsis

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 https://cloud.google.com/compute/docs/reference/beta/autoscalers for more information on Autoscaling.
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 https://cloud.google.com/compute/docs/instance-templates to learn more about Instance Templates. Required for creating MIGs.
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


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