output "instance_names" {
  description = "Noms des instances"
  value = {
    frontend = google_compute_instance.frontend.name
    backend  = google_compute_instance.backend.name
    database = google_compute_instance.database.name
  }
}

output "frontend_public_ip" {
    value = google_compute_instance.frontend.network_interface[0].access_config[0].nat_ip 
}