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terraform/modules/compute/main.tf

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+# compute/main.tf
+
+resource "google_compute_instance" "frontend" {
+  name         = "frontend-instance"
+  machine_type = var.instance_type
+  zone         = var.zone
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-11"
+      size  = 10
+    }
+  }
+
+  network_interface {
+    subnetwork = var.frontend_subnet_id
+    access_config {} # IP publique
+  }
+
+  metadata = {
+    enable-oslogin = "TRUE"
+  }
+
+  tags = ["frontend", "ssh"]
+}
+
+resource "google_compute_instance" "backend" {
+  name         = "backend-instance"
+  machine_type = var.instance_type
+  zone         = var.zone
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-11"
+      size  = 10
+    }
+  }
+
+  network_interface {
+    subnetwork = var.backend_subnet_id
+    # Pas d'IP publique
+  }
+
+  metadata = {
+    enable-oslogin = "TRUE"
+  }
+
+  tags = ["backend", "ssh"]
+}
+
+resource "google_compute_instance" "database" {
+  name         = "database-instance"
+  machine_type = var.instance_type
+  zone         = var.zone
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-11"
+      size  = 20
+    }
+  }
+
+  network_interface {
+    subnetwork = var.database_subnet_id
+    # Pas d'IP publique
+  }
+
+  metadata = {
+    enable-oslogin = "TRUE"
+  }
+
+  tags = ["database", "ssh"]
+}
+

terraform/modules/compute/outputs.tf

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+# compute/outputs.tf
+
+# 1. IPs internes de toutes les instances
+output "internal_ips" {
+  description = "IPs internes des instances"
+  value = {
+    frontend = google_compute_instance.frontend.network_interface[0].network_ip
+    backend  = google_compute_instance.backend.network_interface[0].network_ip
+    database = google_compute_instance.database.network_interface[0].network_ip
+  }
+}
+
+# 2. IP publique du frontend
+output "frontend_public_ip" {
+  description = "IP publique de l'instance frontend"
+  value       = google_compute_instance.frontend.network_interface[0].access_config[0].nat_ip
+}
+
+# 3. Noms des instances
+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
+  }
+}

terraform/modules/compute/variables.tf

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+# compute/variables.tf
+
+variable "instance_type" {
+  description = "Type d'instance GCE à utiliser"
+  type        = string
+}
+
+variable "zone" {
+  description = "Zone dans laquelle déployer les instances"
+  type        = string
+}
+
+variable "frontend_subnet_id" {
+  description = "ID du sous-réseau frontend"
+  type        = string
+}
+
+variable "backend_subnet_id" {
+  description = "ID du sous-réseau backend"
+  type        = string
+}
+
+variable "database_subnet_id" {
+  description = "ID du sous-réseau database"
+  type        = string
+}
+