Bonus

terraform/environments/dev/main.tf

@@ -51,4 +51,5 @@ module "compute" {
   database_subnet_id = module.network.subnet_ids["database"]
   ssh_pub_key = var.ssh_pub_key
   service_account_email = module.iam.service_account_email
+  instance_count = var.compute_instance_count
 }

terraform/environments/dev/variables.tf

@@ -26,4 +26,10 @@ variable "instance_type" {
   type        = string
   description = "Type of the VM instance"
   default     = "e2-small"
+}
+
+variable "compute_instance_count" {
+  type        = number
+  description = "Number of VM instances to create"
+  default     = 2
 }