Create a MIG with multiple machine types

Console

1. In the Google Cloud console, go to the Instance groups page.

   Go to Instance groups

2. Click Create instance group.

3. In the Name field, enter a name for the MIG.

4. In the Instance template list, select the instance template that you want to use for the MIG.

5. Before you can specify the Number of instances and add Instance selections, you need to do the following:

   1. Set a location as follows:

      1. Scroll further to the Location section and select Multiple zones.

      2. In the Regions and the Zones drop-downs, select a region and the zones in which you want to create the VMs in the MIG. If you selected a regional instance template, then the region of that template is selected by default.

      3. In the Target distribution shape field, select Balanced or Any single zone.

      4. In the dialog that opens, click Disable instance redistribution.

   2. Delete the autoscaling configuration as follows:

      1. In the Autoscaling section, from the Autoscaling mode drop-down, click Delete autoscaling configuration.

      2. In the dialog that opens, click Delete.

   3. Scroll back to the Number of instances field.

6. In the Number of instances field, specify the number of VMs that you want in the group.

7. In the Instance selections section, click Add instance selections.

   The Instance selections window opens.

   1. Click Add instance selection.

   2. In the New instance selection section, do the following:

      1. In the Name field, enter a name for the instance selection.

      2. In the Machine types section, click Add machine type, select a machine type that you want to add in the instance selection, and then click Done.

         Repeat this step for each machine type that you want to add to the instance selection.

      3. After you add the machine types to the instance selection, click Done.

8. In the Instance selections window, click Done.

9. Leave the other fields in their default settings or modify as needed.

10. Click Create.

gcloud

To create a regional MIG with multiple machine types, use the instance-groups managed create command as follows:

gcloud compute instance-groups managed create INSTANCE_GROUP_NAME \
    --region REGION \
    --size TARGET_SIZE \
    --template INSTANCE_TEMPLATE \
    --target-distribution-shape SHAPE \
    --instance-redistribution-type none \
    --instance-selection-machine-types MACHINE_TYPE,MACHINE_TYPE,...

Zonal MIGs don't support instance flexibility. However, if you want to create a MIG in a single zone, set the target distribution shape to any-single-zone. Furthermore, if you want a specific zone, use the any-single-zone distribution shape and include the --zones ZONE flag.

Replace the following:

• INSTANCE_GROUP_NAME: the name of the MIG.
• REGION: the region where you want to create the MIG.
• TARGET_SIZE: the number of VMs you want the MIG to create and maintain.
• INSTANCE_TEMPLATE: the name of the instance template.
• SHAPE: the target distribution shape. The value can be balanced or any-single-zone. The other target distribution shapes are not supported.
• MACHINE_TYPE: the machine types that you want to configure in the MIG—for example, n1-standard-16,n2-standard-16,e2-standard-16.

Terraform

If you haven't already created an instance template, which specifies the VM properties that you want for each VM in your MIG, create an instance template.

To create a regional MIG with multiple machine types, use the google_compute_region_instance_group_manager resource.

resource "google_compute_region_instance_group_manager" "default" {
  name               = "flex-igm"
  base_instance_name = "tf-test-flex-igm"
  region             = "us-central1"

  target_size                      = 3
  distribution_policy_target_shape = "ANY_SINGLE_ZONE"

  version {
    instance_template = google_compute_instance_template.default.id
  }

  instance_flexibility_policy {
    instance_selections {
      name          = "default-instance-selection"
      machine_types = ["n1-standard-16", "n2-standard-16", "e2-standard-16"]
    }
  }

  update_policy {
    instance_redistribution_type = "NONE"
    type                         = "OPPORTUNISTIC"
    minimal_action               = "REPLACE"
    max_surge_fixed              = 0
    max_unavailable_fixed        = 6
  }
}

To learn how to apply or remove a Terraform configuration, see Basic Terraform commands.

REST

To create a regional MIG with multiple machine types, make a POST request to the regionInstanceGroupManagers.insert method.

POST https://compute.googleapis.com/compute/v1/projects/PROJECT_ID/regions/REGION/instanceGroupManagers

{
  "name": "INSTANCE_GROUP_NAME",
  "targetSize": TARGET_SIZE,
  "instanceTemplate": "INSTANCE_TEMPLATE_URL",
  "distributionPolicy": {
    "targetShape": "SHAPE"
  },
  "updatePolicy": {
    "instanceRedistributionType": "NONE"
  },
  "instanceFlexibilityPolicy": {
    "instanceSelections": {
      "INSTANCE_SELECTION": {
        "machineTypes": [
          "MACHINE_TYPE_1",
          "MACHINE_TYPE_2",
          ...
        ]
      }
    }
  }
}

Zonal MIGs don't support instance flexibility. However, if you want to create a MIG in a single zone, set the target distribution shape to ANY_SINGLE_ZONE. Furthermore, if you want a specific zone, use the ANY_SINGLE_ZONE distribution shape and include the distributionPolicy.zones[].zone field in the request.

Replace the following:

• PROJECT_ID: your project ID.
• REGION: the region where you want to create the MIG.
• INSTANCE_GROUP_NAME: the name of the MIG.
• TARGET_SIZE: the number of VMs you want the MIG to create and maintain.
• INSTANCE_TEMPLATE_URL: the URL of the instance template.
• SHAPE: the target distribution shape. The value can be BALANCED or ANY_SINGLE_ZONE. The other target distribution shapes are not supported.
• INSTANCE_SELECTION: the name for the list of machine types.
• MACHINE_TYPE: the machine types that you want to configure in the MIG—for example, "n1-standard-16","n2-standard-16","e2-standard-16".