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Merge pull request #4087 from ajcrowe/google-instance_groups
provider/google: Support for unmanaged instance groups (google_compute_instance_group)
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---
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layout: "google"
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page_title: "Google: google_compute_instance_group"
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sidebar_current: "docs-google-compute-instance-group"
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description: |-
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Manages an Instance Group within GCE.
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---
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# google\_compute\_instance\_group
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The Google Compute Engine Instance Group API creates and manages pools
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of homogeneous Compute Engine virtual machine instances from a common instance
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template. For more information, see [the official documentation](https://cloud.google.com/compute/docs/instance-groups/unmanaged-groups)
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and [API](https://cloud.google.com/compute/docs/reference/latest/instanceGroups)
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## Example Usage
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Empty instance group
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```
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resource "google_compute_instance_group" "foobar" {
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name = "terraform-test"
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description = "Terraform test instance group"
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zone = "us-central1-a"
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}
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```
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With instances and named ports
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```
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resource "google_compute_instance_group" "foobar" {
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name = "terraform-test"
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description = "Terraform test instance group"
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instances = [
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"${google_compute_instance.test.self_link}",
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"${google_compute_instance.test2.self_link}"
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]
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named_port {
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name = "http"
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port = "8080"
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}
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named_port {
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name = "https"
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port = "8443"
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}
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zone = "us-central1-a"
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}
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```
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## Argument Reference
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The following arguments are supported:
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* `name` - (Required) The name of the instance group. Must be 1-63
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characters long and comply with [RFC1035](https://www.ietf.org/rfc/rfc1035.txt).
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Supported characters include lowercase letters, numbers, and hyphens.
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* `description` - (Optional) An optional textual description of the instance
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group.
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* `instances` - (Optional) List of instances in the group. They should be given as
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self_link URLs. When adding instances they must all be in the same network and
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zone as the instance group.
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* `named_port` - (Optional) Named ports are key:value pairs that represent a
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service name and the port number that the service runs on. The key:value pairs
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are simple metadata that the Load Balancing service can use. This can specified
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multiple times
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* `zone` - (Required) The zone that this instance group should be created in.
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The `named_port` block supports:
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* `name` - The name which the port will be mapped to.
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* `port` - The port number to map the name to.
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## Attributes Reference
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The following attributes are exported:
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* `network` - The network the instance group is in.
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* `size` - The number of instances in the group.
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* `self_link` - The URL of the created resource.
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