but3-iac/terraform/modules/network/main.tf

resource "google_compute_network" "vpc" {
  name                    = "mon-vpc"
  auto_create_subnetworks = false
}

# Sous-réseau
resource "google_compute_subnetwork" "frontend_network" {
  name          = "mon-frontend"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.frontend_cidr
  region        = var.region
}

resource "google_compute_subnetwork" "backend_network" {
  name          = "mon-backend"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.backend_cidr
  region        = var.region
}

resource "google_compute_subnetwork" "database_network" {
  name          = "mon-database"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.database_cidr
  region        = var.region
}

resource "google_compute_firewall" "ssh_firewall" {
  name    = "mon-ssh"
  network = google_compute_network.vpc.id

   allow {
    protocol = "tcp"
    ports    = ["22"]
  }

  source_ranges = ["0.0.0.0/0"]
  target_tags = ["ssh"]
 
}


resource "google_compute_firewall" "frontend_firewall" {
  name    = "frontend"
  network = google_compute_network.vpc.id

   allow {
    protocol = "tcp"
    ports    = ["80", "443"]
  }

  source_ranges = ["0.0.0.0/0"]
  target_tags = ["frontend"]
 
}

resource "google_compute_firewall" "backend_firewall" {
  name    = "backend"
  network = google_compute_network.vpc.id

   allow {
    protocol = "tcp"
    ports    = ["8000"]
  }

  source_tags = ["frontend"]
  target_tags = ["backend"]
  
}

resource "google_compute_firewall" "database_firewall" {
  name    = "database"
  network = google_compute_network.vpc.id

   allow {
    protocol = "tcp"
    ports    = ["3306"]
  }

  source_tags = ["backend"]
  target_tags = ["database"]
  
}