Manual scaling for worker pools

This page shows you how to manually scale your worker pool.

Overview

Manual scaling lets you set a specific instance count without requiring redeployment. This gives you the option to write your own scaling logic using an external system. See the Kafka Autoscaler for an example of this.

Billing considerations when using manual scaling

When you use manual scaling, all the instances that you requested are billed as active instances, even if they happen to be idle. For complete billing details, see the pricing page.

Required roles

To get the permissions that you need to deploy Cloud Run worker pools, ask your administrator to grant you the following IAM roles:

Cloud Run Developer (roles/run.developer) on the Cloud Run service
Service Account User (roles/iam.serviceAccountUser) on the service identity
Artifact Registry Reader (roles/artifactregistry.reader) on the Artifact Registry repository of the deployed container image (if applicable)

For a list of IAM roles and permissions that are associated with Cloud Run, see Cloud Run IAM roles and Cloud Run IAM permissions. If your Cloud Run worker pool interfaces with Google Cloud APIs, such as Cloud Client Libraries, see the service identity configuration guide. For more information about granting roles, see deployment permissions and manage access.

Configure scaling

Changing scaling mode or changing the manual instance count does not create a new revision.

To configure the scaling mode, use the Google Cloud console or the Google Cloud CLI:

Console

In the Google Cloud console, go to Cloud Run:

Go to Cloud Run
If you are configuring a new worker pool, select Worker pools from the menu, and click Deploy container. If you are configuring an existing worker pool, click the worker pool to display its detail pane, then click the pen icon next to Scaling at the top right of the detail panel.
Locate the Scaling form (for a new worker pool) or the Edit scaling form for an existing worker pool.
In the field labelled Number of instances, specify the number of container instances for the service.
Finish the specification.
Click Create for a new worker pool or Save for an existing worker pool.

gcloud

To specify scaling for a new worker pool, use the deploy command:

gcloud beta run worker-pools deploy WORKER_POOL \
    --scaling=INSTANCE_COUNT \
    --image IMAGE_URL

Replace the following:

WORKER_POOL: the name of your worker pool.
INSTANCE_COUNT: the number of instances for the worker pool. This sets the worker pool to manual scaling. Specify a value of 0 to disable the worker pool.
IMAGE_URL: a reference to the container image that contains the worker pool, such as us-docker.pkg.dev/cloudrun/container/worker-pool:latest.

Specify scaling for an existing worker pool by using the following update command:

gcloud beta run worker-pools update WORKER_POOL \
   --scaling=INSTANCE_COUNT

Terraform

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

resource "google_cloud_run_v2_worker_pool" "default" {
  name     = "WORKER_POOL"
  ___location = "REGION"
  launch_stage = "BETA"

  template {
    containers {
      image = "IMAGE_URL"
    }
  }
  scaling {
    scaling_mode = "MANUAL"
    manual_instance_count = "INSTANCE_COUNT"
  }
}

Replace the following:

WORKER_POOL: the name of the worker pool.
REGION: the Google Cloud region—for example, europe-west1.
IMAGE_URL: a reference to the container image that contains the worker pool, such as us-docker.pkg.dev/cloudrun/container/worker-pool:latest.
INSTANCE_COUNT: the number of instances for the worker pool. This sets the worker pool to manual scaling. Specify a value of 0 to disable the worker pool.

View scaling configuration for a worker pool

In the Google Cloud console, go to Cloud Run:

Go to Cloud Run
Click Worker pools to display the list of deployed worker pools.
Click the worker pool you want to examine to display its details pane.
The current scaling setting is shown above the worker pools revision list: Scaling: Manual (Instances: ).

Disable a worker pool

To disable a worker pool, use the following command to set scaling to zero:

gcloud beta run worker-pools update WORKER_POOL --scaling=0

Replace WORKER_POOL with the name of your worker pool.