local.region is derived from the zone when var.region is not available (zonal cluster).

Author: Andras Gyömrey

cluster.tf

@@ -42,7 +42,7 @@ resource "google_container_cluster" "primary" {
   }
 
 
-  subnetwork = "projects/${local.network_project_id}/regions/${var.region}/subnetworks/${var.subnetwork}"
+  subnetwork = "projects/${local.network_project_id}/regions/${local.region}/subnetworks/${var.subnetwork}"
 
   min_master_version = local.master_version
 

test/fixtures/simple_zonal/example.tf

@@ -19,7 +19,6 @@ module "example" {
 
   project_id          = var.project_ids[1]
   cluster_name_suffix = "-${random_string.suffix.result}"
-  region              = var.region
   zones               = slice(var.zones, 0, 1)
   network             = google_compute_network.main.name
   subnetwork          = google_compute_subnetwork.main.name

test/fixtures/simple_zonal_private/example.tf

@@ -19,7 +19,6 @@ module "example" {
 
   project_id                     = var.project_ids[1]
   cluster_name_suffix            = "-${random_string.suffix.result}"
-  region                         = var.region
   zones                          = slice(var.zones, 0, 1)
   network                        = google_compute_network.main.name
   subnetwork                     = google_compute_subnetwork.main.name