feature/tofu (#15)

@thomas.solbjor her er "import" av tofu fra ditt repo med justeringer for å tilpasse patterns her. Også minimalisert til å kun opprette cluster, ingen managed services som postgres etc. Ta en titt.

Co-authored-by: Danijel Simeunovic <danijel.simeunovic@fortedigital.com>
Reviewed-on: #15
Reviewed-by: Danijel Simeunovic <danijel.simeunovic@fortedigital.com>
Co-authored-by: Ghost <>
Co-committed-by: Ghost <>

.tofu/platforms/gke/dev/main.tf

@@ -0,0 +1,17 @@
+module "cluster" {
+  source = "../modules/cluster"
+
+  project_id = var.project_id
+  region     = var.region
+  prefix     = "clst-dev"
+
+  # GKE — small dev nodes
+  node_machine_type   = "e2-standard-2"
+  node_count          = 2
+  deletion_protection = false
+
+  labels = {
+    environment = "dev"
+    managed-by  = "tofu"
+  }
+}

.tofu/platforms/gke/dev/outputs.tf

@@ -0,0 +1,3 @@
+output "cluster_name" { value = module.cluster.cluster_name }
+output "project_id"   { value = module.cluster.project_id }
+output "region"       { value = module.cluster.region }

.tofu/platforms/gke/dev/providers.tf

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+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 6.0"
+    }
+  }
+}
+
+# Authentication: use Application Default Credentials (gcloud auth application-default login)
+# or set GOOGLE_APPLICATION_CREDENTIALS to a service account key file.
+provider "google" {
+  project = var.project_id
+  region  = var.region
+}
+
+variable "project_id" {
+  description = "GCP project ID for the dev environment"
+  type        = string
+}
+
+variable "region" {
+  description = "GCP region"
+  type        = string
+  default     = "europe-west4"
+}

.tofu/platforms/gke/modules/cluster/main.tf

@@ -0,0 +1,115 @@
+# ─── Required APIs ────────────────────────────────────────────────────
+
+resource "google_project_service" "compute" {
+  project            = var.project_id
+  service            = "compute.googleapis.com"
+  disable_on_destroy = false
+}
+
+resource "google_project_service" "container" {
+  project            = var.project_id
+  service            = "container.googleapis.com"
+  disable_on_destroy = false
+}
+
+# ─── Networking ───────────────────────────────────────────────────────
+
+resource "google_compute_network" "main" {
+  project                 = var.project_id
+  name                    = "${var.prefix}-vpc"
+  auto_create_subnetworks = false
+
+  depends_on = [google_project_service.compute]
+}
+
+resource "google_compute_subnetwork" "main" {
+  project       = var.project_id
+  name          = "${var.prefix}-subnet"
+  ip_cidr_range = "10.100.0.0/22"
+  region        = var.region
+  network       = google_compute_network.main.id
+
+  # Secondary ranges required for GKE VPC-native cluster
+  secondary_ip_range {
+    range_name    = "pods"
+    ip_cidr_range = "10.200.0.0/14" # /14 = ~262k pod IPs
+  }
+
+  secondary_ip_range {
+    range_name    = "services"
+    ip_cidr_range = "10.204.0.0/20" # /20 = ~4k service IPs
+  }
+}
+
+# ─── GKE Cluster ──────────────────────────────────────────────────────
+#
+# Regional cluster (3 control-plane replicas) for HA.
+# Workload Identity enabled — allows K8s service accounts to impersonate
+# Google Service Accounts for keyless access to GCP services.
+
+resource "google_container_cluster" "main" {
+  project  = var.project_id
+  name     = "${var.prefix}-gke"
+  location = var.region # regional cluster
+
+  network    = google_compute_network.main.id
+  subnetwork = google_compute_subnetwork.main.id
+
+  # VPC-native cluster with alias IP ranges
+  ip_allocation_policy {
+    cluster_secondary_range_name  = "pods"
+    services_secondary_range_name = "services"
+  }
+
+  # Workload Identity pool — enables OIDC token projection for pods
+  workload_identity_config {
+    workload_pool = "${var.project_id}.svc.id.goog"
+  }
+
+  # Remove default node pool — we manage our own below
+  remove_default_node_pool = true
+  initial_node_count       = 1
+
+  deletion_protection = var.deletion_protection
+
+  dynamic "release_channel" {
+    for_each = var.kubernetes_version == null ? [1] : []
+    content {
+      channel = "STABLE"
+    }
+  }
+
+  resource_labels = var.labels
+
+  depends_on = [google_project_service.container]
+}
+
+resource "google_container_node_pool" "main" {
+  project    = var.project_id
+  name       = "${var.prefix}-nodes"
+  location   = var.region
+  cluster    = google_container_cluster.main.name
+  node_count = var.node_count
+
+  node_config {
+    machine_type = var.node_machine_type
+
+    # GKE_METADATA mode is required for Workload Identity
+    workload_metadata_config {
+      mode = "GKE_METADATA"
+    }
+
+    oauth_scopes = [
+      "https://www.googleapis.com/auth/cloud-platform",
+    ]
+
+    labels = merge(var.labels, {
+      role = "worker"
+    })
+  }
+
+  management {
+    auto_repair  = true
+    auto_upgrade = true
+  }
+}

.tofu/platforms/gke/modules/cluster/outputs.tf

@@ -0,0 +1,16 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+output "cluster_name" {
+  description = "GKE cluster name"
+  value       = google_container_cluster.main.name
+}
+
+output "project_id" {
+  description = "GCP project ID"
+  value       = var.project_id
+}
+
+output "region" {
+  description = "GCP region"
+  value       = var.region
+}

.tofu/platforms/gke/modules/cluster/providers.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 6.0"
+    }
+  }
+}

.tofu/platforms/gke/modules/cluster/variables.tf

@@ -0,0 +1,48 @@
+# ─── Project / Region ────────────────────────────────────────────────
+
+variable "project_id" {
+  description = "GCP project ID"
+  type        = string
+}
+
+variable "region" {
+  description = "GCP region (e.g., europe-west4, europe-west1)"
+  type        = string
+}
+
+variable "prefix" {
+  description = "Prefix for resource names (e.g., clst-dev)"
+  type        = string
+}
+
+# ─── GKE Cluster ─────────────────────────────────────────────────────
+
+variable "node_machine_type" {
+  description = "GKE node machine type (e.g., e2-standard-2, e2-standard-4)"
+  type        = string
+}
+
+variable "node_count" {
+  description = "Number of nodes per zone (regional cluster spawns nodes in each zone)"
+  type        = number
+}
+
+variable "kubernetes_version" {
+  description = "GKE Kubernetes version channel (null = STABLE release channel)"
+  type        = string
+  default     = null
+}
+
+variable "deletion_protection" {
+  description = "Prevent cluster deletion (set true for production)"
+  type        = bool
+  default     = false
+}
+
+# ─── Labels ──────────────────────────────────────────────────────────
+
+variable "labels" {
+  description = "Labels applied to all resources"
+  type        = map(string)
+  default     = {}
+}

.tofu/platforms/gke/prod/main.tf

@@ -0,0 +1,17 @@
+module "cluster" {
+  source = "../modules/cluster"
+
+  project_id = var.project_id
+  region     = var.region
+  prefix     = "clst"
+
+  # GKE — general-purpose nodes for production
+  node_machine_type   = "e2-standard-4"
+  node_count          = 3
+  deletion_protection = true
+
+  labels = {
+    environment = "prod"
+    managed-by  = "tofu"
+  }
+}

.tofu/platforms/gke/prod/outputs.tf

@@ -0,0 +1,3 @@
+output "cluster_name" { value = module.cluster.cluster_name }
+output "project_id"   { value = module.cluster.project_id }
+output "region"       { value = module.cluster.region }

.tofu/platforms/gke/prod/providers.tf

@@ -0,0 +1,24 @@
+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 6.0"
+    }
+  }
+}
+
+provider "google" {
+  project = var.project_id
+  region  = var.region
+}
+
+variable "project_id" {
+  description = "GCP project ID for the prod environment"
+  type        = string
+}
+
+variable "region" {
+  description = "GCP region"
+  type        = string
+  default     = "europe-west1"
+}

.tofu/platforms/gke/workload/main.tf

@@ -0,0 +1,194 @@
+# =============================================================================
+# GCP Workload Cluster
+# =============================================================================
+# A lean GKE cluster for running application workloads. No managed data
+# services — those live on the platform cluster. ArgoCD (on the platform
+# cluster) deploys apps to this cluster via the app-of-apps pattern.
+#
+# Platform components deployed by deploy-workload.sh:
+#   nginx-ingress, cert-manager, external-dns, external-secrets, alloy
+#
+# Usage:
+#   tofu init && tofu plan && tofu apply
+#   ./sync-tofu-outputs.sh --env gcp-workload
+#   ./deploy-workload.sh --env gcp-workload
+# =============================================================================
+
+variable "prefix" {
+  description = "Prefix for resource names (e.g., clst-workload)"
+  type        = string
+  default     = "clst-workload"
+}
+
+variable "node_machine_type" {
+  description = "GKE node machine type"
+  type        = string
+  default     = "e2-standard-2"
+}
+
+variable "node_count" {
+  description = "Number of nodes per zone"
+  type        = number
+  default     = 1
+}
+
+variable "kubernetes_version" {
+  description = "GKE Kubernetes version (null = STABLE release channel)"
+  type        = string
+  default     = null
+}
+
+variable "deletion_protection" {
+  description = "Prevent cluster deletion"
+  type        = bool
+  default     = false
+}
+
+variable "labels" {
+  description = "Labels applied to all resources"
+  type        = map(string)
+  default = {
+    environment = "workload"
+    managed-by  = "tofu"
+  }
+}
+
+# ─── Required APIs ────────────────────────────────────────────────────
+
+resource "google_project_service" "compute" {
+  project            = var.project_id
+  service            = "compute.googleapis.com"
+  disable_on_destroy = false
+}
+
+resource "google_project_service" "container" {
+  project            = var.project_id
+  service            = "container.googleapis.com"
+  disable_on_destroy = false
+}
+
+resource "google_project_service" "iam" {
+  project            = var.project_id
+  service            = "iam.googleapis.com"
+  disable_on_destroy = false
+}
+
+resource "google_project_service" "dns" {
+  project            = var.project_id
+  service            = "dns.googleapis.com"
+  disable_on_destroy = false
+}
+
+# ─── Networking ───────────────────────────────────────────────────────
+
+resource "google_compute_network" "main" {
+  project                 = var.project_id
+  name                    = "${var.prefix}-vpc"
+  auto_create_subnetworks = false
+
+  depends_on = [google_project_service.compute]
+}
+
+resource "google_compute_subnetwork" "main" {
+  project       = var.project_id
+  name          = "${var.prefix}-subnet"
+  ip_cidr_range = "10.110.0.0/22"
+  region        = var.region
+  network       = google_compute_network.main.id
+
+  secondary_ip_range {
+    range_name    = "pods"
+    ip_cidr_range = "10.210.0.0/14"
+  }
+
+  secondary_ip_range {
+    range_name    = "services"
+    ip_cidr_range = "10.214.0.0/20"
+  }
+}
+
+# ─── GKE Cluster ──────────────────────────────────────────────────────
+
+resource "google_container_cluster" "main" {
+  project  = var.project_id
+  name     = "${var.prefix}-gke"
+  location = var.region
+
+  network    = google_compute_network.main.id
+  subnetwork = google_compute_subnetwork.main.id
+
+  ip_allocation_policy {
+    cluster_secondary_range_name  = "pods"
+    services_secondary_range_name = "services"
+  }
+
+  workload_identity_config {
+    workload_pool = "${var.project_id}.svc.id.goog"
+  }
+
+  remove_default_node_pool = true
+  initial_node_count       = 1
+
+  deletion_protection = var.deletion_protection
+
+  dynamic "release_channel" {
+    for_each = var.kubernetes_version == null ? [1] : []
+    content {
+      channel = "STABLE"
+    }
+  }
+
+  resource_labels = var.labels
+
+  depends_on = [google_project_service.container]
+}
+
+resource "google_container_node_pool" "main" {
+  project    = var.project_id
+  name       = "${var.prefix}-nodes"
+  location   = var.region
+  cluster    = google_container_cluster.main.name
+  node_count = var.node_count
+
+  node_config {
+    machine_type = var.node_machine_type
+
+    workload_metadata_config {
+      mode = "GKE_METADATA"
+    }
+
+    oauth_scopes = [
+      "https://www.googleapis.com/auth/cloud-platform",
+    ]
+
+    labels = merge(var.labels, { role = "worker" })
+  }
+
+  management {
+    auto_repair  = true
+    auto_upgrade = true
+  }
+}
+
+# ─── External-DNS Workload Identity ──────────────────────────────────
+# Allows external-dns to manage Cloud DNS records for app ingresses.
+
+resource "google_service_account" "external_dns" {
+  project      = var.project_id
+  account_id   = "${var.prefix}-external-dns"
+  display_name = "External-DNS Service Account (Workload Identity)"
+
+  depends_on = [google_project_service.iam]
+}
+
+resource "google_project_iam_member" "external_dns_dns_admin" {
+  project = var.project_id
+  role    = "roles/dns.admin"
+  member  = "serviceAccount:${google_service_account.external_dns.email}"
+}
+
+resource "google_service_account_iam_member" "external_dns_workload_identity" {
+  service_account_id = google_service_account.external_dns.name
+  role               = "roles/iam.workloadIdentityUser"
+  member             = "serviceAccount:${var.project_id}.svc.id.goog[external-dns/external-dns]"
+}

.tofu/platforms/gke/workload/outputs.tf

@@ -0,0 +1,4 @@
+output "cluster_name"           { value = google_container_cluster.main.name }
+output "project_id"             { value = var.project_id }
+output "region"                 { value = var.region }
+output "external_dns_gsa_email" { value = google_service_account.external_dns.email }

.tofu/platforms/gke/workload/providers.tf

@@ -0,0 +1,26 @@
+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 6.0"
+    }
+  }
+}
+
+# Authentication: use Application Default Credentials (gcloud auth application-default login)
+# or set GOOGLE_APPLICATION_CREDENTIALS to a service account key file.
+provider "google" {
+  project = var.project_id
+  region  = var.region
+}
+
+variable "project_id" {
+  description = "GCP project ID for the workload environment"
+  type        = string
+}
+
+variable "region" {
+  description = "GCP region"
+  type        = string
+  default     = "europe-west4"
+}