Terraform support to deploy GCS using custom dual-region

[vnachimu]

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Description

Current Terraform provider is NOT supporting to create a custom dual-region GCS bucket using location field. It works just fine with Google's predefined dual-regions - NAM4, ASIA1, EUR4. When you create a custom-dual region with a location field as US-CENTRAL1+US-EAST1, the terraform state stores the location as US. When we make an update to the bucket next time, there is a mismatch between code and state file, which forces the deployment to be recreated like force replacement.

However, both console and gcloud work fine without any issues. Google handles dual-regions something like this in gcloud-gsutil.

gsutil mb -l MULTI-REGION --placement REGION_1,REGION_2 gs://BUCKET_NAME/

There is an option / switch called "placement" where you can specify the dual-region info. Once the bucket has created, the backend data has been stored as below.

gs://my-bucket/ :
Storage class: STANDARD
Location type: dual-region
Location constraint: US
Placement locations: [US-CENTRAL1, US-WEST1]

GCS Terraform is not offering this switch "placement" to specify 2 regions to create a bucket. Therefore, we pass dual-region info like this,

location = US-CENTRAL1+US-EAST1

New or Affected Resource(s)

Google Cloud Storage (GCS)
storage.googleapis.com

Potential Terraform Configuration

When we create a bucket, there should be an option to say the placement locations info in terraform resource. Something like below.

resource "google_storage_bucket" "auto-expire" {
name = "auto-expiring-bucket"
location = "US"
placement = [US-CENTRAL1, US-WEST1]
}

References

#1229
terraform-google-modules/terraform-google-cloud-storage#182

• #0000

[c2thorn]

This is possible via the customPlacementConfig field.

[melinath]

b/249089097

[github-actions]

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