Add machine type variable to GKE.

terraform/modules/gke/gke.tf

@@ -22,6 +22,13 @@ variable "private_subnetwork_id" {
   type        = string
 }
 
+variable "machine_type" {
+  description = "Machine type for GKE nodes."
+  type        = string
+  # Default is very cheap but low ram. Good for simple testing but not for production. Try e2-standard-2 if you need more ram.
+  default = "e2-medium"
+}
+
 output "gke_connect_command" {
   description = "Command to run to connect to the kubernetes cluster."
   value       = "gcloud container clusters get-credentials ${google_container_cluster.primary.name} --region ${var.region} --project ${var.project}"
@@ -179,7 +186,7 @@ resource "google_container_node_pool" "primary" {
 
   node_config {
     preemptible  = true
-    machine_type = "e2-medium"
+    machine_type = var.machine_type
 
     service_account = google_service_account.gke.email
     oauth_scopes = [