Finished first version of network, network-peering and linux-vm modules.

modules/network-peering/main.tf

@@ -0,0 +1,24 @@
+# Peering
+resource "google_compute_network_peering" "left_to_right" {
+  name         = "${var.left.network_name}-to-${var.right.network_name}"
+  network      = var.left.network_id
+  peer_network = var.right.network_id
+
+  export_custom_routes = true
+  import_custom_routes = var.hub_spoke ? false : true
+
+  export_subnet_routes_with_public_ip = true
+  import_subnet_routes_with_public_ip = var.hub_spoke ? false : true
+}
+
+resource "google_compute_network_peering" "right_to_left" {
+  name         = "${var.right.network_name}-to-${var.left.network_name}"
+  network      = var.right.network_id
+  peer_network = var.left.network_id
+
+  export_custom_routes = var.hub_spoke ? false : true
+  import_custom_routes = true
+
+  export_subnet_routes_with_public_ip = var.hub_spoke ? false : true
+  import_subnet_routes_with_public_ip = true
+}

modules/network-peering/variables.tf

@@ -0,0 +1,23 @@
+variable "left" {
+  description = "The left side of the peering connection."
+  type = object({
+    project_id   = string
+    network_id   = string
+    network_name = string
+  })
+}
+
+variable "right" {
+  description = "The right side of the peering connection."
+  type = object({
+    project_id   = string
+    network_id   = string
+    network_name = string
+  })
+}
+
+variable "hub_spoke" {
+  type        = bool
+  default     = false
+  description = "Set to true if the peering is hub-spoke."
+}

modules/network/main.tf

@@ -1,5 +1,5 @@
 # VPC
-resource "google_compute_network" "vpc_network" {
+resource "google_compute_network" "network" {
   name                    = var.name
   auto_create_subnetworks = false
 }
@@ -10,21 +10,21 @@ resource "google_compute_subnetwork" "subnet" {
   name          = var.subnets[count.index].name
   ip_cidr_range = var.subnets[count.index].cidr
   region        = var.subnets[count.index].region != null ? var.subnets[count.index].region : var.subnets[0].region
-  network       = google_compute_network.vpc_network.id
+  network       = google_compute_network.network.id
 }
 
 # Cloud NAT
 resource "google_compute_router" "cr" {
   name    = "${var.name}-router"
-  network = google_compute_network.vpc_network.id
-  region  = var.subnets[0].region
+  network = var.name
+
+  depends_on = [google_compute_network.network]
 }
 
-resource "google_compute_router_nat" "name" {
-  name = "${var.name}-nat"
-  region = var.subnets[0].region
-  router = google_compute_router.cr.name
-  nat_ip_allocate_option = "AUTO_ONLY"
+resource "google_compute_router_nat" "nat" {
+  name                               = "${var.name}-nat"
+  router                             = google_compute_router.cr.name
+  nat_ip_allocate_option             = "AUTO_ONLY"
   source_subnetwork_ip_ranges_to_nat = "ALL_SUBNETWORKS_ALL_IP_RANGES"
-  enable_dynamic_port_allocation = true
+  enable_dynamic_port_allocation     = true
 }

modules/network/outputs.tf

@@ -0,0 +1,9 @@
+output "id" {
+  description = "The ID of the VPC network."
+  value       = google_compute_network.network.id
+}
+
+output "name" {
+  description = "The name of the VPC network."
+  value       = google_compute_network.network.name
+}