Cloud Run update image after creation using Terraform

[DeepakShevre]

I am trying to create Cloud Run with ESPV2. This requires me to

1. Reserve a cloud run address by deploying a dummy cloud run instance.
2. Use the address and API spec file to build an endpoints container image
3. Update the service created at step 1 with the Hello image with newly created at step 2.

Link for Google Documentation is here https://cloud.google.com/endpoints/docs/openapi/set-up-cloud-functions-espv2

Can you suggest a way to implement this using Terraform ??
I don’t mind during this in two steps (having two terraform configurations). But I am not sure how to update an existing instance without creating it in the same terraform config. (the second one tries to recreate it).

Any help is highly appreciated.

[christianpaula]

Hi @DeepakShevre,

Welcome to Google Cloud Community!

Updating Cloud Run Image with ESPv2 after Creation

While Terraform can't directly update an existing Cloud Run service's image, here are alternative approaches:

1. Separate Terraform Configurations:

• Configuration 1: Creates a Cloud Run service with a placeholder image (dummy). (https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/cloud_run_service)
• Configuration 2:
• Reads the service address from configuration 1's output. (https://developer.hashicorp.com/terraform/language/values/outputs)
• Builds the Endpoints container image using the address and API spec.
• Uses google_cloud_run_revision to deploy a new revision with the built image. (https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/cloud_run_service)

2. Cloud Build Triggers:

• Store your image in a container registry.
• Configure a Cloud Build trigger to:
• Build and deploy on new image push.
• Access Cloud Run service address from Secret Manager.
• Build Endpoints image with retrieved address and API spec.
• Deploy the new image as a revision. (https://cloud.google.com/build/docs/overview)

3. Cloud Deployment Manager (IaC):

• Define stages in your deployment script:
• Stage 1: Create the service with a placeholder image.
• Stage 2: Trigger a script or Cloud Build job for update. (https://cloud.google.com/deployment-manager/docs)

Consideration:

Terraform recreates resources on configuration changes, leading to downtime. These approaches offer a more controlled update process.