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terraform/environements/dev/main.tf

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+# Provider Google
+provider "google" {
+  project = var.project_id
+  region  = var.region
+  zone    = var.zone
+}
+
+# Module IAM
+module "iam" {
+  source     = "../../modules/iam"
+  project_id = var.project_id
+}
+
+# Module Compute
+module "compute" {
+  source              = "../../modules/compute"
+  instance_type       = var.instance_type
+  zone                = var.zone
+  frontend_subnet_id  = var.frontend_subnet_id
+  backend_subnet_id   = var.backend_subnet_id
+  database_subnet_id  = var.database_subnet_id
+}
+
+# Exemple de création d'un template pour Ansible
+data "template_file" "ansible_inventory" {
+  template = <<EOT
+[frontend]
+${module.compute.frontend_internal_ip} ansible_user=YOUR_SSH_USER
+
+[backend]
+${module.compute.backend_internal_ip} ansible_user=YOUR_SSH_USER
+
+[database]
+${module.compute.database_internal_ip} ansible_user=YOUR_SSH_USER
+EOT
+}
+
+# Optionnel : écrire le fichier sur le disque
+resource "local_file" "ansible_inventory" {
+  content  = data.template_file.ansible_inventory.rendered
+  filename = "${path.module}/inventory.ini"
+}

terraform/environements/dev/outputs.tf

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+# Outputs du module Compute
+output "frontend_internal_ip" {
+  value = module.compute.frontend_internal_ip
+}
+
+output "backend_internal_ip" {
+  value = module.compute.backend_internal_ip
+}
+
+output "database_internal_ip" {
+  value = module.compute.database_internal_ip
+}
+
+output "frontend_public_ip" {
+  value = module.compute.frontend_public_ip
+}
+
+output "instance_names" {
+  value = module.compute.instance_names
+}
+
+# Outputs du module IAM
+output "service_account_email" {
+  value = module.iam.service_account_email
+}
+
+output "service_account_key" {
+  value     = module.iam.service_account_key
+  sensitive = true
+}
+
+# Output du fichier Ansible généré
+output "ansible_inventory_file" {
+  value = local_file.ansible_inventory.filename
+}

terraform/environements/dev/variables.tf

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+# Variables pour le projet GCP
+variable "project_id" {
+  description = "ID du projet GCP"
+  type        = string
+  default     = "mon-projet-gcp-dev"
+}
+
+variable "region" {
+  description = "Région GCP"
+  type        = string
+  default     = "europe-west1"
+}
+
+variable "zone" {
+  description = "Zone GCP"
+  type        = string
+  default     = "europe-west1-b"
+}
+
+# Variables pour les subnets
+variable "frontend_subnet_id" {
+  description = "ID du subnet frontend"
+  type        = string
+}
+
+variable "backend_subnet_id" {
+  description = "ID du subnet backend"
+  type        = string
+}
+
+variable "database_subnet_id" {
+  description = "ID du subnet database"
+  type        = string
+}
+
+# Type d'instance par défaut
+variable "instance_type" {
+  description = "Type d'instance pour Compute"
+  type        = string
+  default     = "e2-medium"
+}

terraform/modules/compute/main.tf

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+resource "google_compute_instance" "frontend" {
+  name         = "frontend"
+  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"
+  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"
+  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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+output "frontend_internal_ip" {
+  value = google_compute_instance.frontend.network_interface[0].network_ip
+}
+
+output "backend_internal_ip" {
+  value = google_compute_instance.backend.network_interface[0].network_ip
+}
+
+output "database_internal_ip" {
+  value = google_compute_instance.database.network_interface[0].network_ip
+}
+
+output "frontend_public_ip" {
+  value = google_compute_instance.frontend.network_interface[0].access_config[0].nat_ip
+}
+
+output "instance_names" {
+  value = [
+    google_compute_instance.frontend.name,
+    google_compute_instance.backend.name,
+    google_compute_instance.database.name
+  ]
+}

terraform/modules/compute/variables.tf

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+variable "instance_type" {
+  description = "Type de machine pour les instances"
+  type        = string
+  default     = "e2-medium"
+}
+
+variable "zone" {
+  description = "Zone où seront déployées les instances"
+  type        = string
+  default     = "europe-west1-b"
+}
+
+variable "frontend_subnet_id" {
+  description = "ID du subnet pour le frontend"
+  type        = string
+}
+
+variable "backend_subnet_id" {
+  description = "ID du subnet pour le backend"
+  type        = string
+}
+
+variable "database_subnet_id" {
+  description = "ID du subnet pour la base de données"
+  type        = string
+}

terraform/modules/iam/main.tf

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+# Création du compte de service Terraform
+resource "google_service_account" "terraform" {
+  account_id   = "terraform-sa"
+  display_name = "Terraform Service Account"
+  project      = var.project_id
+}
+
+# Création de la clé pour le compte de service
+resource "google_service_account_key" "terraform_key" {
+  service_account_id = google_service_account.terraform.name
+  keepers = {
+    # Permet de régénérer la clé si besoin
+    project = var.project_id
+  }
+}
+
+# Attribution de rôles IAM
+# Exemples de rôles pour pouvoir gérer Compute, IAM et OS Login
+resource "google_project_iam_member" "compute_admin" {
+  project = var.project_id
+  role    = "roles/compute.admin"
+  member  = "serviceAccount:${google_service_account.terraform.email}"
+}
+
+resource "google_project_iam_member" "iam_admin" {
+  project = var.project_id
+  role    = "roles/iam.serviceAccountAdmin"
+  member  = "serviceAccount:${google_service_account.terraform.email}"
+}
+
+resource "google_project_iam_member" "oslogin" {
+  project = var.project_id
+  role    = "roles/compute.osLogin"
+  member  = "serviceAccount:${google_service_account.terraform.email}"
+}
+
+# Configuration d'OS Login avec clé SSH
+resource "google_compute_project_metadata_item" "enable_oslogin" {
+  project = var.project_id
+  key     = "enable-oslogin"
+  value   = "TRUE"
+}

terraform/modules/iam/outputs.tf

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+output "service_account_email" {
+  value = google_service_account.terraform.email
+}
+
+output "service_account_key" {
+  value     = google_service_account_key.terraform_key.private_key
+  sensitive = true
+}

terraform/modules/iam/variables.tf

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+variable "project_id" {
+  description = "ID du projet GCP"
+  type        = string
+}

terraform/modules/network/main.tf

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

terraform/modules/network/outputs.tf

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+output "vpc_id" {
+  description = "ID du VPC créé"
+  value       = google_compute_network.custom_vpc.id
+}
+
+output "subnet_ids" {
+  description = "IDs des sous-réseaux"
+  value = {
+    frontend = google_compute_subnetwork.frontend.id
+    backend  = google_compute_subnetwork.backend.id
+    database = google_compute_subnetwork.database.id
+  }
+}

terraform/modules/network/variables.tf

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+variable "project_name" {
+  description = "Nom du projet GCP"
+  type        = string
+}
+
+variable "region" {
+  description = "Région pour le VPC et les sous-réseaux"
+  type        = string
+}
+
+
+variable "ssh_source_ranges" {
+  description = "Plages IP autorisées pour SSH"
+  type        = string
+}
+
+variable "frontend_cidr" {
+  description = "CIDR for frontend subnet"
+  type        = string
+  default     = "10.0.1.0/24"
+}
+
+variable "backend_cidr" {
+  description = "CIDR for backend subnet"
+  type        = string
+  default     = "10.0.2.0/24"
+}
+
+variable "database_cidr" {
+  description = "CIDR for database subnet"
+  type        = string
+  default     = "10.0.3.0/24"
+}