---
layout: "google"
page_title: "Google: google_replicapool_instance_group_manager"
sidebar_current: "docs-google-resource-instance_group_manager"
description: |-
  Managers an Instance Group within GCE.
---

# google\_replicapool\_instance\_group\_manager

The Google Compute Engine Instance Group Manager API creates and manages pools
of homogeneous Compute Engine virtual machine instances from a common instance
template.  For more information, see [the official documentation](https://cloud.google.com/compute/docs/instance-groups/manager
and [API](https://cloud.google.com/compute/docs/instance-groups/manager/v1beta2/instanceGroupManagers)

## Example Usage

```
resource "google_replicapool_instance_group_manager" "foobar" {
	description = "Terraform test instance group manager"
	name = "terraform-test"
	instance_template = "${google_compute_instance_template.foobar.self_link}"
	target_pools = ["${google_compute_target_pool.foobar.self_link}"]
	base_instance_name = "foobar"
	zone = "us-central1-a"
	size = 2
}
```

## Argument Refernce

The following arguments are supported:

* `base_instance_name` - (Required) The base instance name to use for
instances in this group. The value must be a valid [RFC1035](https://www.ietf.org/rfc/rfc1035.txt) name.
Supported characters are lowercase letters, numbers, and hyphens (-). Instances
are named by appending a hyphen and a random four-character string to the base
instance name.

* `description` - (Optional) An optional textual description of the instance
group manager.

* `instance_template` - (Required) The full URL to an instance template from
which all new instances will be created.

* `name` - (Required) The name of the instance group manager. Must be 1-63
characters long and comply with [RFC1035](https://www.ietf.org/rfc/rfc1035.txt).
Supported characters include lowercase letters, numbers, and hyphens.

* `size` - (Required) The desired number of instance to be maintained in this
instance group manager.

* `target_pools` - (Required) The full URL of all target pools to which new
instances in the group are added. Updating the target pool values does not
affect existing instances.

* `zone` - (Required) The zone that instances in this group should be created in.

## Attributes Reference

The following attributes are exported:

* `group` - The full URL of the instance group created by the manager.

* `self_link` - The URL of the created resource.

Add tests for InstanceGroupManagers in GCE.
Add tests for InstanceGroupManagers in GCE.
