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Merge autoscaler & instance group PR from dwatson
Additionally: Update CHANGELOG Make cooldown period optional for autoscaler Refactor autoscaler and add more error checking Instance template now supports image aliases Replace instance group manager 'size' -- use target_size (now writeable) Add documentation for autoscaler Add beta warnings to docs
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Dave Cunningham
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r/autoscaler.html.markdown
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r/autoscaler.html.markdown
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---
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layout: "google"
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page_title: "Google: google_autoscaler"
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sidebar_current: "docs-google-resource-autoscaler"
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description: |-
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Managers an Instance Group within GCE.
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---
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# google\_autoscaler
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**Note**: This resource is in
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[beta](https://cloud.google.com/terms/launch-stages).
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A Compute Engine Autoscaler automatically adds or removes virtual machines from
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a managed instance group based on increases or decreases in load. This allows
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your applications to gracefully handle increases in traffic and reduces cost
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when the need for resources is lower. You just define the autoscaling policy and
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the autoscaler performs automatic scaling based on the measured load. For more
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information, see [the official
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documentation](https://cloud.google.com/compute/docs/autoscaler/) and
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[API](https://cloud.google.com/compute/docs/autoscaler/v1beta2/autoscalers)
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## Example Usage
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```
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resource "google_compute_instance_template" "foobar" {
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name = "foobar"
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machine_type = "n1-standard-1"
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can_ip_forward = false
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tags = ["foo", "bar"]
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disk {
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source_image = "debian-cloud/debian-7-wheezy-v20140814"
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}
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network_interface {
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network = "default"
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}
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metadata {
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foo = "bar"
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}
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service_account {
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scopes = ["userinfo-email", "compute-ro", "storage-ro"]
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}
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}
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resource "google_compute_target_pool" "foobar" {
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name = "foobar"
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}
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resource "google_replicapool_instance_group_manager" "foobar" {
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name = "foobar"
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instance_template = "${google_compute_instance_template.foobar.self_link}"
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target_pools = ["${google_compute_target_pool.foobar.self_link}"]
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base_instance_name = "foobar"
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zone = "us-central1-f"
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}
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resource "google_autoscaler" "foobar" {
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name = "foobar"
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zone = "us-central1-f"
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target = "${google_replicapool_instance_group_manager.foobar.self_link}"
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autoscaling_policy = {
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max_replicas = 5
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min_replicas = 1
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cooldown_period = 60
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cpu_utilization = {
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target = 0.5
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}
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}
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}
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```
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## Argument Refernce
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The following arguments are supported:
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* `description` - (Optional) An optional textual description of the instance
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group manager.
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* `target` - (Required) The full URL to the instance group manager whose size we
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control.
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* `autoscaling_policy.` - (Required) The parameters of the autoscaling
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algorithm. Structure is documented below.
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* `zone` - (Required) The zone of the target.
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The `autoscaling_policy` block contains:
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* `max_replicas` - (Required) The group will never be larger than this.
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* `min_replicas` - (Required) The group will never be smaller than this.
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* `cooldown_period` - (Optional) Period to wait between changes. This should be
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at least double the time your instances take to start up.
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* `cpu_utilization` - (Optional) A policy that scales when the cluster's average
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CPU is above or below a given threshold. Structure is documented below.
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* `metric` - (Optional) A policy that scales according to Google Cloud
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Monitoring metrics Structure is documented below.
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* `load_balancing_utilization` - (Optional) A policy that scales when the load
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reaches a proportion of a limit defined in the HTTP load balancer. Structure
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is documented below.
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The `cpu_utilization` block contains:
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* `target` - The floating point threshold where CPU utilization should be. E.g.
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for 50% one would specify 0.5.
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The `metric` block contains (more documentation
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[here](https://cloud.google.com/monitoring/api/metrics)):
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* `name` - The name of the Google Cloud Monitoring metric to follow, e.g.
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compute.googleapis.com/instance/network/received_bytes_count
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* `type` - Either "cumulative", "delta", or "gauge".
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* `target` - The desired metric value per instance. Must be a positive value.
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The `load_balancing_utilization` block contains:
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* `target` - The floating point threshold where load balancing utilization
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should be. E.g. if the load balancer's `maxRatePerInstance` is 10 requests
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per second (RPS) then setting this to 0.5 would cause the group to be scaled
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such that each instance receives 5 RPS.
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## Attributes Reference
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The following attributes are exported:
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* `self_link` - The URL of the created resource.
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68
r/replicapool_instance_group_manager.html.markdown
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r/replicapool_instance_group_manager.html.markdown
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---
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layout: "google"
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page_title: "Google: google_replicapool_instance_group_manager"
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sidebar_current: "docs-google-resource-instance_group_manager"
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description: |-
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Manages an Instance Group within GCE.
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---
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# google\_replicapool\_instance\_group\_manager
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**Note**: This resource is in
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[beta](https://cloud.google.com/terms/launch-stages).
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The Google Compute Engine Instance Group Manager 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/manager
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and [API](https://cloud.google.com/compute/docs/instance-groups/manager/v1beta2/instanceGroupManagers)
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## Example Usage
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```
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resource "google_replicapool_instance_group_manager" "foobar" {
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description = "Terraform test instance group manager"
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name = "terraform-test"
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instance_template = "${google_compute_instance_template.foobar.self_link}"
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target_pools = ["${google_compute_target_pool.foobar.self_link}"]
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base_instance_name = "foobar"
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zone = "us-central1-a"
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target_size = 2
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}
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```
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## Argument Refernce
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The following arguments are supported:
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* `base_instance_name` - (Required) The base instance name to use for
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instances in this group. The value must be a valid [RFC1035](https://www.ietf.org/rfc/rfc1035.txt) name.
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Supported characters are lowercase letters, numbers, and hyphens (-). Instances
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are named by appending a hyphen and a random four-character string to the base
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instance name.
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* `description` - (Optional) An optional textual description of the instance
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group manager.
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* `instance_template` - (Required) The full URL to an instance template from
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which all new instances will be created.
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* `name` - (Required) The name of the instance group manager. 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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* `target_size` - (Optional) If not given at creation time, this defaults to 1. Do not specify this
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if you are managing the group with an autoscaler, as this will cause fighting.
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* `target_pools` - (Required) The full URL of all target pools to which new
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instances in the group are added. Updating the target pool values does not
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affect existing instances.
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* `zone` - (Required) The zone that instances in this group should be created in.
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## Attributes Reference
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The following attributes are exported:
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* `group` - The full URL of the instance group created by the manager.
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* `self_link` - The URL of the created resource.
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