virtualisation/modules/network/main.tf

resource "google_compute_network" "vpc" {
  name                    = "net1"
  auto_create_subnetworks = false
}

# Sous-réseau
resource "google_compute_subnetwork" "subnet1" {
  name          = "frontend"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.frontend_cidr
  region        = var.region
}

resource "google_compute_subnetwork" "subnet2" {
  name          = "backend"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.backend_cidr
  region        = var.region
}

resource "google_compute_subnetwork" "subnet3" {
  name          = "database"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.database_cidr
  region        = var.region
}

resource "google_compute_firewall" "allow_http" {
  name    = "rule-http"
  network = google_compute_network.vpc.id

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

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

resource "google_compute_firewall" "allow_ssh" {
  name    = "allow-ssh"
  network = google_compute_network.vpc.id

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

  source_ranges = [var.ssh_source_ranges]
  target_tags   = ["ssh"]
}

resource "google_compute_firewall" "front_to_back" {
  name    = "front-to-back"
  network = google_compute_network.vpc.id

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

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

resource "google_compute_firewall" "back_to_bdd" {
  name    = "back-to-bdd"
  network = google_compute_network.vpc.id

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

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