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modules/network/main.tf

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+# Define VPC
+resource "google_compute_network" "vpc_network" {
+  name                    = var.vpc_name
+  project                 = var.project_id
+  auto_create_subnetworks = false
+}
+
+# Define subnetwork
+resource "google_compute_subnetwork" "vpc_subnet" {
+  name          = var.subnet_name
+  ip_cidr_range = var.subnet_cidr_range
+  region        = var.region
+  network       = google_compute_network.vpc_network.self_link
+}
+
+# Define firewall rule for frontend instances
+resource "google_compute_firewall" "frontend_firewall" {
+  name    = "allow-frontend"
+  network = google_compute_network.vpc_network.self_link
+
+  allow {
+    protocol = "tcp"
+    ports    = ["8080"]
+  }
+
+  target_tags = ["frontend"]
+}
+
+# Define firewall rule for backend instances
+resource "google_compute_firewall" "backend_firewall" {
+  name    = "allow-backend"
+  network = google_compute_network.vpc_network.self_link
+
+  allow {
+    protocol = "tcp"
+    ports    = ["8081-8082"]
+  }
+
+  target_tags = ["backend"]
+}
+