[GKE] Support Reservation Affinity

[wuisawesome]

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Description

This is a feature request to support setting reservation affinity on GKE clusters (via the node_config block of google_container_cluster and google_container_node_pool). This would be consistent with the GCP REST and gRPC APIs.

Reservation affinity for GKE is described in more detail here.

New or Affected Resource(s)

• google_container_cluster
• google_container_node_pool

Potential Terraform Configuration

# Consume a specific reseration.
resource "google_container_node_pool" "a_node_pool" {
  name       = "my-node-pool"
  location   = "us-central1"
  cluster    = google_container_cluster.primary.name
  node_count = 1

  node_config {
    machine_type = "e2-medium"
    reservation_affinity {
      consume_reservation_type = "SPECIFIC_RESERVATION"
      key = "googleapis.com/reservation-name"
      values = ["my-reservation-1", "reservation-2"]
    }
  }
}

# Other reservation types with less fields.
resource "google_container_node_pool" "another_node_pool" {
  name       = "my-node-pool"
  location   = "us-central1"
  cluster    = google_container_cluster.primary.name
  node_count = 1

  node_config {
    machine_type = "e2-medium"
    reservation_affinity {
      consume_reservation_type = "ANY_RESERVATION"
    }
  }
}

References

• GKE Documentation on reservation affinity.
• gRPC service definition for setting reservation affinity when creating a cluster.

[melinath]

Resolved by GoogleCloudPlatform/magic-modules#6412

[github-actions]

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