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terraform/modules/network/main.tf

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+resource "google_compute_network" "vpc" {
+  name                    = "${var.project_name}-vpc"
+  auto_create_subnetworks = false
+}
+
+
+resource "google_compute_subnetwork" "frontend" {
+  name          = "frontend"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.frontend_cidr
+  region        = var.region
+}
+
+
+resource "google_compute_subnetwork" "backend" {
+  name          = "backend"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.backend_cidr
+  region        = var.region
+}
+
+resource "google_compute_subnetwork" "database" {
+  name          = "database"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.database_cidr
+  region        = var.region
+}
+
+
+
+
+
+
+
+resource "google_compute_firewall" "frontend_http_https" {
+  name    = "${var.project_name}-frontend-http-https"
+  network = google_compute_network.vpc.name
+
+  allow {
+    protocol = "tcp"
+    ports    = ["80", "443"]
+  }
+
+  source_ranges = ["0.0.0.0/0"]
+
+  target_tags = ["frontend"]
+}
+
+
+
+resource "google_compute_firewall" "ssh_access" {
+  name    = "${var.project_name}-ssh"
+  network = google_compute_network.vpc.name
+
+  allow {
+    protocol = "tcp"
+    ports    = ["22"]
+  }
+
+  source_ranges = [var.ssh_source_ranges]
+
+  target_tags = ["frontend", "backend", "database"]
+}
+
+
+resource "google_compute_firewall" "frontend_to_backend" {
+  name    = "${var.project_name}-frontend-to-backend"
+  network = google_compute_network.vpc.name
+
+  allow {
+    protocol = "tcp"
+    ports    = ["8000"]
+  }
+
+  source_tags = ["frontend"]
+  target_tags = ["backend"]
+}
+
+
+resource "google_compute_firewall" "backend_to_database" {
+  name    = "${var.project_name}-backend-to-database"
+  network = google_compute_network.vpc.name
+
+  allow {
+    protocol = "tcp"
+    ports    = ["3306"]
+  }
+
+  source_tags = ["backend"]
+  target_tags = ["database"]
+}
+
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