.gitignore

@@ -16,3 +16,11 @@ devbox.d/
 devbox.lock
 .devbox/
 bash.exe.stackdump
+
+# OpenTofu
+.tofu/configs/*.env
+.tofu/scripts/*.config
+.tofu/platforms/**/.terraform/
+.tofu/platforms/**/terraform.tfstate*
+.tofu/platforms/**/tfplan
+.tofu/platforms/**/.terraform.lock.hcl

.tofu/configs/aks.env.example

@@ -0,0 +1,9 @@
+# Azure AKS credentials — copy to aks.env and fill in values
+# NEVER commit aks.env to git!
+
+# Required
+AZURE_TENANT_ID=your-azure-tenant-id
+AZURE_SUBSCRIPTION_ID=your-azure-subscription-id
+
+# Optional — defaults to cluster name if not set
+ARM_RESOURCE_GROUP=

.tofu/configs/eks.env.example

@@ -0,0 +1,10 @@
+# AWS EKS credentials — copy to eks.env and fill in values
+# NEVER commit eks.env to git!
+
+# Required — AWS CLI profile or access key
+AWS_PROFILE=default
+AWS_REGION=eu-west-1
+
+# Optional — override with explicit keys instead of profile
+# AWS_ACCESS_KEY_ID=
+# AWS_SECRET_ACCESS_KEY=

.tofu/configs/gke.env.example

@@ -0,0 +1,9 @@
+# GCP GKE credentials — copy to gke.env and fill in values
+# NEVER commit gke.env to git!
+
+# Required
+GCP_PROJECT_ID=your-gcp-project-id
+GCP_REGION=europe-west4
+
+# Optional — path to service account JSON key (if not using gcloud auth)
+# GOOGLE_APPLICATION_CREDENTIALS=/path/to/sa-key.json

.tofu/configs/upc.env.example

@@ -0,0 +1,8 @@
+# UpCloud credentials — copy to upc.env and fill in values
+# NEVER commit upc.env to git!
+
+# Required
+UPCLOUD_TOKEN=your-upcloud-api-token
+
+# Optional — set after cluster creation for kubeconfig retrieval
+UPCLOUD_CLUSTER_ID=

.tofu/platforms/aks/dev/main.tf

@@ -0,0 +1,18 @@
+module "cluster" {
+  source = "../modules/cluster"
+
+  prefix              = "clst-dev"
+  location            = "norwayeast"
+  resource_group_name = "clst-dev-rg"
+
+  # AKS — small dev nodes
+  aks_node_vm_size = "Standard_B2s"
+  aks_node_count   = 2
+
+  enable_delete_lock = false
+
+  tags = {
+    Environment = "dev"
+    ManagedBy   = "tofu"
+  }
+}

.tofu/platforms/aks/dev/outputs.tf

@@ -0,0 +1,26 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+output "cluster_name" {
+  value = module.cluster.cluster_name
+}
+
+output "resource_group_name" {
+  value = module.cluster.resource_group_name
+}
+
+output "kubernetes_version" {
+  value = module.cluster.kubernetes_version
+}
+
+output "location" {
+  value = module.cluster.location
+}
+
+output "oidc_issuer_url" {
+  value = module.cluster.oidc_issuer_url
+}
+
+output "kubeconfig" {
+  value     = module.cluster.kubeconfig
+  sensitive = true
+}

.tofu/platforms/aks/dev/providers.tf

@@ -0,0 +1,17 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    azurerm = {
+      source  = "hashicorp/azurerm"
+      version = "~> 4.0"
+    }
+  }
+}
+
+provider "azurerm" {
+  features {}
+  # Credentials via environment variables:
+  #   ARM_SUBSCRIPTION_ID, ARM_TENANT_ID, ARM_CLIENT_ID, ARM_CLIENT_SECRET
+  # Or: az login (uses your Azure CLI session)
+}

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

@@ -0,0 +1,72 @@
+# Current Azure/Entra ID context — provides tenant_id used in outputs
+data "azurerm_client_config" "current" {}
+
+# ─── Resource Group ───────────────────────────────────────────────────
+
+resource "azurerm_resource_group" "main" {
+  name     = var.resource_group_name
+  location = var.location
+  tags     = var.tags
+}
+
+resource "azurerm_management_lock" "main" {
+  count      = var.enable_delete_lock ? 1 : 0
+  name       = "${var.prefix}-delete-lock"
+  scope      = azurerm_resource_group.main.id
+  lock_level = "CanNotDelete"
+  notes      = "Prevents accidental deletion of production resources"
+}
+
+# ─── Networking ───────────────────────────────────────────────────────
+
+resource "azurerm_virtual_network" "main" {
+  name                = "${var.prefix}-vnet"
+  resource_group_name = azurerm_resource_group.main.name
+  location            = azurerm_resource_group.main.location
+  address_space       = [var.vnet_address_space]
+  tags                = var.tags
+}
+
+# AKS nodes subnet
+resource "azurerm_subnet" "aks" {
+  name                 = "${var.prefix}-aks-subnet"
+  resource_group_name  = azurerm_resource_group.main.name
+  virtual_network_name = azurerm_virtual_network.main.name
+  address_prefixes     = [var.aks_subnet_cidr]
+}
+
+# ─── AKS Cluster ──────────────────────────────────────────────────────
+
+resource "azurerm_kubernetes_cluster" "main" {
+  name                = "${var.prefix}-aks"
+  resource_group_name = azurerm_resource_group.main.name
+  location            = azurerm_resource_group.main.location
+  dns_prefix          = replace(var.prefix, "-", "")
+  kubernetes_version  = var.aks_kubernetes_version
+  tags                = var.tags
+
+  default_node_pool {
+    name           = "system"
+    node_count     = var.aks_node_count
+    vm_size        = var.aks_node_vm_size
+    vnet_subnet_id = azurerm_subnet.aks.id
+    node_labels = {
+      prefix = var.prefix
+      role   = "worker"
+      env    = lookup(var.tags, "Environment", "dev")
+    }
+  }
+
+  identity {
+    type = "SystemAssigned"
+  }
+
+  network_profile {
+    network_plugin = "azure"
+    network_policy = "azure"
+  }
+
+  # Enable Workload Identity for keyless Azure service access (MSI)
+  oidc_issuer_enabled       = true
+  workload_identity_enabled = true
+}

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

@@ -0,0 +1,32 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+output "cluster_name" {
+  description = "AKS cluster name"
+  value       = azurerm_kubernetes_cluster.main.name
+}
+
+output "resource_group_name" {
+  description = "Resource group name"
+  value       = azurerm_resource_group.main.name
+}
+
+output "kubernetes_version" {
+  description = "Kubernetes version"
+  value       = azurerm_kubernetes_cluster.main.kubernetes_version
+}
+
+output "location" {
+  description = "Azure region"
+  value       = azurerm_resource_group.main.location
+}
+
+output "oidc_issuer_url" {
+  description = "AKS OIDC issuer URL (for workload identity federation)"
+  value       = azurerm_kubernetes_cluster.main.oidc_issuer_url
+}
+
+output "kubeconfig" {
+  description = "Kubeconfig for the AKS cluster"
+  value       = azurerm_kubernetes_cluster.main.kube_config_raw
+  sensitive   = true
+}

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

@@ -0,0 +1,18 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    azurerm = {
+      source  = "hashicorp/azurerm"
+      version = "~> 4.0"
+    }
+    azuread = {
+      source  = "hashicorp/azuread"
+      version = "~> 3.0"
+    }
+    random = {
+      source  = "hashicorp/random"
+      version = "~> 3.0"
+    }
+  }
+}

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

@@ -0,0 +1,56 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+variable "prefix" {
+  description = "Prefix for resource names"
+  type        = string
+}
+
+variable "location" {
+  description = "Azure region (e.g., norwayeast, westeurope, northeurope)"
+  type        = string
+}
+
+variable "resource_group_name" {
+  description = "Name of the Azure Resource Group to create"
+  type        = string
+}
+
+variable "vnet_address_space" {
+  description = "Address space for the virtual network"
+  type        = string
+  default     = "10.100.0.0/16"
+}
+
+variable "aks_subnet_cidr" {
+  description = "CIDR block for the AKS node subnet"
+  type        = string
+  default     = "10.100.0.0/22"
+}
+
+variable "aks_node_vm_size" {
+  description = "VM size for AKS worker nodes (e.g., Standard_B2s, Standard_D4s_v3)"
+  type        = string
+}
+
+variable "aks_node_count" {
+  description = "Number of AKS worker nodes"
+  type        = number
+}
+
+variable "aks_kubernetes_version" {
+  description = "Kubernetes version for AKS (null = latest stable)"
+  type        = string
+  default     = null
+}
+
+variable "enable_delete_lock" {
+  description = "Protect the resource group from accidental deletion"
+  type        = bool
+  default     = false
+}
+
+variable "tags" {
+  description = "Tags applied to all resources"
+  type        = map(string)
+  default     = {}
+}

.tofu/platforms/aks/prod/main.tf

@@ -0,0 +1,18 @@
+module "cluster" {
+  source = "../modules/cluster"
+
+  prefix              = "clst"
+  location            = "westeurope"
+  resource_group_name = "clst-prod-rg"
+
+  # AKS — general-purpose nodes for production
+  aks_node_vm_size = "Standard_D4s_v3"
+  aks_node_count   = 3
+
+  enable_delete_lock = true
+
+  tags = {
+    Environment = "prod"
+    ManagedBy   = "tofu"
+  }
+}

.tofu/platforms/aks/prod/outputs.tf

@@ -0,0 +1,26 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+output "cluster_name" {
+  value = module.cluster.cluster_name
+}
+
+output "resource_group_name" {
+  value = module.cluster.resource_group_name
+}
+
+output "kubernetes_version" {
+  value = module.cluster.kubernetes_version
+}
+
+output "location" {
+  value = module.cluster.location
+}
+
+output "oidc_issuer_url" {
+  value = module.cluster.oidc_issuer_url
+}
+
+output "kubeconfig" {
+  value     = module.cluster.kubeconfig
+  sensitive = true
+}

.tofu/platforms/aks/prod/providers.tf

@@ -0,0 +1,17 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    azurerm = {
+      source  = "hashicorp/azurerm"
+      version = "~> 4.0"
+    }
+  }
+}
+
+provider "azurerm" {
+  features {}
+  # Credentials via environment variables:
+  #   ARM_SUBSCRIPTION_ID, ARM_TENANT_ID, ARM_CLIENT_ID, ARM_CLIENT_SECRET
+  # Or: az login (uses your Azure CLI session)
+}

.tofu/platforms/aks/workload/main.tf

@@ -0,0 +1,173 @@
+# =============================================================================
+# Azure Workload Cluster
+# =============================================================================
+# A lean AKS 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 azure-workload
+#   ./deploy-workload.sh --env azure-workload
+# =============================================================================
+
+variable "prefix" {
+  description = "Prefix for resource names (e.g., clst-workload)"
+  type        = string
+  default     = "clst-workload"
+}
+
+variable "location" {
+  description = "Azure region"
+  type        = string
+  default     = "norwayeast"
+}
+
+variable "resource_group_name" {
+  description = "Name of the Azure Resource Group to create"
+  type        = string
+  default     = "clst-workload-rg"
+}
+
+variable "vnet_address_space" {
+  description = "Address space for the virtual network"
+  type        = string
+  default     = "10.110.0.0/16"
+}
+
+variable "aks_subnet_cidr" {
+  description = "CIDR block for the AKS node subnet"
+  type        = string
+  default     = "10.110.0.0/22"
+}
+
+variable "aks_node_vm_size" {
+  description = "VM size for AKS worker nodes"
+  type        = string
+  default     = "Standard_B2s"
+}
+
+variable "aks_node_count" {
+  description = "Number of AKS worker nodes"
+  type        = number
+  default     = 2
+}
+
+variable "aks_kubernetes_version" {
+  description = "Kubernetes version for AKS (null = latest stable)"
+  type        = string
+  default     = null
+}
+
+variable "domain" {
+  description = "Public domain name — must have an existing Azure DNS zone"
+  type        = string
+}
+
+variable "dns_zone_resource_group" {
+  description = "Resource group containing the Azure DNS zone (defaults to cluster RG)"
+  type        = string
+  default     = ""
+}
+
+variable "tags" {
+  description = "Tags applied to all resources"
+  type        = map(string)
+  default = {
+    Environment = "workload"
+    ManagedBy   = "tofu"
+  }
+}
+
+# ─── Resource Group ───────────────────────────────────────────────────
+
+resource "azurerm_resource_group" "main" {
+  name     = var.resource_group_name
+  location = var.location
+  tags     = var.tags
+}
+
+# ─── Networking ───────────────────────────────────────────────────────
+
+resource "azurerm_virtual_network" "main" {
+  name                = "${var.prefix}-vnet"
+  resource_group_name = azurerm_resource_group.main.name
+  location            = azurerm_resource_group.main.location
+  address_space       = [var.vnet_address_space]
+  tags                = var.tags
+}
+
+resource "azurerm_subnet" "aks" {
+  name                 = "${var.prefix}-aks-subnet"
+  resource_group_name  = azurerm_resource_group.main.name
+  virtual_network_name = azurerm_virtual_network.main.name
+  address_prefixes     = [var.aks_subnet_cidr]
+}
+
+# ─── AKS Cluster ──────────────────────────────────────────────────────
+
+resource "azurerm_kubernetes_cluster" "main" {
+  name                = "${var.prefix}-aks"
+  resource_group_name = azurerm_resource_group.main.name
+  location            = azurerm_resource_group.main.location
+  dns_prefix          = replace(var.prefix, "-", "")
+  kubernetes_version  = var.aks_kubernetes_version
+  tags                = var.tags
+
+  default_node_pool {
+    name           = "system"
+    node_count     = var.aks_node_count
+    vm_size        = var.aks_node_vm_size
+    vnet_subnet_id = azurerm_subnet.aks.id
+    node_labels = {
+      prefix = var.prefix
+      role   = "worker"
+      env    = lookup(var.tags, "Environment", "workload")
+    }
+  }
+
+  identity {
+    type = "SystemAssigned"
+  }
+
+  network_profile {
+    network_plugin = "azure"
+    network_policy = "azure"
+  }
+
+  oidc_issuer_enabled       = true
+  workload_identity_enabled = true
+}
+
+# ─── External-DNS Workload Identity ──────────────────────────────────
+# Allows external-dns to manage Azure DNS records for app ingresses.
+
+data "azurerm_dns_zone" "main" {
+  name                = var.domain
+  resource_group_name = var.dns_zone_resource_group != "" ? var.dns_zone_resource_group : azurerm_resource_group.main.name
+}
+
+resource "azurerm_user_assigned_identity" "external_dns" {
+  name                = "${var.prefix}-external-dns-identity"
+  resource_group_name = azurerm_resource_group.main.name
+  location            = azurerm_resource_group.main.location
+  tags                = var.tags
+}
+
+resource "azurerm_role_assignment" "external_dns_dns_contributor" {
+  scope                = data.azurerm_dns_zone.main.id
+  role_definition_name = "DNS Zone Contributor"
+  principal_id         = azurerm_user_assigned_identity.external_dns.principal_id
+}
+
+resource "azurerm_federated_identity_credential" "external_dns" {
+  name                = "${var.prefix}-external-dns-fedcred"
+  resource_group_name = azurerm_resource_group.main.name
+  parent_id           = azurerm_user_assigned_identity.external_dns.id
+  audience            = ["api://AzureADTokenExchange"]
+  issuer              = azurerm_kubernetes_cluster.main.oidc_issuer_url
+  subject             = "system:serviceaccount:external-dns:external-dns"
+}

.tofu/platforms/aks/workload/outputs.tf

@@ -0,0 +1,4 @@
+output "cluster_name"                    { value = azurerm_kubernetes_cluster.main.name }
+output "resource_group_name"             { value = azurerm_resource_group.main.name }
+output "location"                        { value = azurerm_resource_group.main.location }
+output "external_dns_identity_client_id" { value = azurerm_user_assigned_identity.external_dns.client_id }

.tofu/platforms/aks/workload/providers.tf

@@ -0,0 +1,21 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    azurerm = {
+      source  = "hashicorp/azurerm"
+      version = "~> 4.0"
+    }
+    random = {
+      source  = "hashicorp/random"
+      version = "~> 3.0"
+    }
+  }
+}
+
+provider "azurerm" {
+  features {}
+  # Credentials via environment variables:
+  #   ARM_SUBSCRIPTION_ID, ARM_TENANT_ID, ARM_CLIENT_ID, ARM_CLIENT_SECRET
+  # Or: az login (uses your Azure CLI session)
+}

.tofu/platforms/eks/dev/main.tf

@@ -0,0 +1,21 @@
+module "cluster" {
+  source = "../modules/cluster"
+
+  region = var.region
+  prefix = "clst-dev"
+
+  # VPC
+  availability_zones = ["${var.region}a", "${var.region}b"]
+
+  # EKS — small dev nodes
+  node_instance_type = "t3.medium"
+  node_count         = 2
+  node_min_count     = 1
+  node_max_count     = 4
+  kubernetes_version = "1.30"
+
+  tags = {
+    Environment = "dev"
+    ManagedBy   = "tofu"
+  }
+}

.tofu/platforms/eks/dev/outputs.tf

@@ -0,0 +1,5 @@
+output "cluster_name"    { value = module.cluster.cluster_name }
+output "aws_region"      { value = module.cluster.aws_region }
+output "oidc_issuer_url" { value = module.cluster.oidc_issuer_url }
+output "oidc_provider_arn" { value = module.cluster.oidc_provider_arn }
+output "vpc_id"          { value = module.cluster.vpc_id }

.tofu/platforms/eks/dev/providers.tf

@@ -0,0 +1,24 @@
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+    tls = {
+      source  = "hashicorp/tls"
+      version = "~> 4.0"
+    }
+  }
+}
+
+# Authentication: set AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN
+# or configure an AWS profile: export AWS_PROFILE=clst
+provider "aws" {
+  region = var.region
+}
+
+variable "region" {
+  description = "AWS region for dev environment"
+  type        = string
+  default     = "eu-west-1"
+}

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

@@ -0,0 +1,207 @@
+# ─── VPC ──────────────────────────────────────────────────────────────
+
+resource "aws_vpc" "main" {
+  cidr_block           = var.vpc_cidr
+  enable_dns_hostnames = true
+  enable_dns_support   = true
+
+  tags = merge(var.tags, { Name = "${var.prefix}-vpc" })
+}
+
+resource "aws_internet_gateway" "main" {
+  vpc_id = aws_vpc.main.id
+  tags   = merge(var.tags, { Name = "${var.prefix}-igw" })
+}
+
+# Public subnets (one per AZ) — for NAT gateways and load balancers
+resource "aws_subnet" "public" {
+  count             = length(var.availability_zones)
+  vpc_id            = aws_vpc.main.id
+  cidr_block        = cidrsubnet(var.vpc_cidr, 4, count.index)
+  availability_zone = var.availability_zones[count.index]
+
+  map_public_ip_on_launch = true
+
+  tags = merge(var.tags, {
+    Name                                        = "${var.prefix}-public-${count.index + 1}"
+    "kubernetes.io/cluster/${var.prefix}-eks"   = "shared"
+    "kubernetes.io/role/elb"                    = "1"
+  })
+}
+
+# Private subnets (one per AZ) — for EKS nodes
+resource "aws_subnet" "private" {
+  count             = length(var.availability_zones)
+  vpc_id            = aws_vpc.main.id
+  cidr_block        = cidrsubnet(var.vpc_cidr, 4, count.index + length(var.availability_zones))
+  availability_zone = var.availability_zones[count.index]
+
+  tags = merge(var.tags, {
+    Name                                        = "${var.prefix}-private-${count.index + 1}"
+    "kubernetes.io/cluster/${var.prefix}-eks"   = "shared"
+    "kubernetes.io/role/internal-elb"           = "1"
+  })
+}
+
+# NAT Gateway (single, in first public subnet — use one per AZ for prod HA)
+resource "aws_eip" "nat" {
+  domain = "vpc"
+  tags   = merge(var.tags, { Name = "${var.prefix}-nat-eip" })
+}
+
+resource "aws_nat_gateway" "main" {
+  allocation_id = aws_eip.nat.id
+  subnet_id     = aws_subnet.public[0].id
+  tags          = merge(var.tags, { Name = "${var.prefix}-nat" })
+
+  depends_on = [aws_internet_gateway.main]
+}
+
+resource "aws_route_table" "public" {
+  vpc_id = aws_vpc.main.id
+
+  route {
+    cidr_block = "0.0.0.0/0"
+    gateway_id = aws_internet_gateway.main.id
+  }
+
+  tags = merge(var.tags, { Name = "${var.prefix}-public-rt" })
+}
+
+resource "aws_route_table_association" "public" {
+  count          = length(var.availability_zones)
+  subnet_id      = aws_subnet.public[count.index].id
+  route_table_id = aws_route_table.public.id
+}
+
+resource "aws_route_table" "private" {
+  vpc_id = aws_vpc.main.id
+
+  route {
+    cidr_block     = "0.0.0.0/0"
+    nat_gateway_id = aws_nat_gateway.main.id
+  }
+
+  tags = merge(var.tags, { Name = "${var.prefix}-private-rt" })
+}
+
+resource "aws_route_table_association" "private" {
+  count          = length(var.availability_zones)
+  subnet_id      = aws_subnet.private[count.index].id
+  route_table_id = aws_route_table.private.id
+}
+
+# ─── EKS Cluster ──────────────────────────────────────────────────────
+
+resource "aws_iam_role" "eks_cluster" {
+  name_prefix = "${var.prefix}-eks-cluster-"
+
+  assume_role_policy = jsonencode({
+    Version = "2012-10-17"
+    Statement = [{
+      Action    = "sts:AssumeRole"
+      Effect    = "Allow"
+      Principal = { Service = "eks.amazonaws.com" }
+    }]
+  })
+
+  tags = var.tags
+}
+
+resource "aws_iam_role_policy_attachment" "eks_cluster_policy" {
+  policy_arn = "arn:aws:iam::aws:policy/AmazonEKSClusterPolicy"
+  role       = aws_iam_role.eks_cluster.name
+}
+
+resource "aws_eks_cluster" "main" {
+  name     = "${var.prefix}-eks"
+  role_arn = aws_iam_role.eks_cluster.arn
+  version  = var.kubernetes_version
+
+  vpc_config {
+    subnet_ids              = concat(aws_subnet.private[*].id, aws_subnet.public[*].id)
+    endpoint_private_access = true
+    endpoint_public_access  = true
+  }
+
+  # Enable OIDC issuer for IRSA (IAM Roles for Service Accounts)
+  access_config {
+    authentication_mode = "API_AND_CONFIG_MAP"
+  }
+
+  tags = var.tags
+
+  depends_on = [aws_iam_role_policy_attachment.eks_cluster_policy]
+}
+
+# OIDC provider — required for IRSA (IAM Roles for Service Accounts)
+data "tls_certificate" "eks" {
+  url = aws_eks_cluster.main.identity[0].oidc[0].issuer
+}
+
+resource "aws_iam_openid_connect_provider" "eks" {
+  client_id_list  = ["sts.amazonaws.com"]
+  thumbprint_list = [data.tls_certificate.eks.certificates[0].sha1_fingerprint]
+  url             = aws_eks_cluster.main.identity[0].oidc[0].issuer
+
+  tags = var.tags
+}
+
+# EKS Node Group
+
+resource "aws_iam_role" "eks_nodes" {
+  name_prefix = "${var.prefix}-eks-nodes-"
+
+  assume_role_policy = jsonencode({
+    Version = "2012-10-17"
+    Statement = [{
+      Action    = "sts:AssumeRole"
+      Effect    = "Allow"
+      Principal = { Service = "ec2.amazonaws.com" }
+    }]
+  })
+
+  tags = var.tags
+}
+
+resource "aws_iam_role_policy_attachment" "eks_worker_node_policy" {
+  policy_arn = "arn:aws:iam::aws:policy/AmazonEKSWorkerNodePolicy"
+  role       = aws_iam_role.eks_nodes.name
+}
+
+resource "aws_iam_role_policy_attachment" "eks_cni_policy" {
+  policy_arn = "arn:aws:iam::aws:policy/AmazonEKS_CNI_Policy"
+  role       = aws_iam_role.eks_nodes.name
+}
+
+resource "aws_iam_role_policy_attachment" "eks_ecr_readonly" {
+  policy_arn = "arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly"
+  role       = aws_iam_role.eks_nodes.name
+}
+
+resource "aws_eks_node_group" "main" {
+  cluster_name    = aws_eks_cluster.main.name
+  node_group_name = "${var.prefix}-nodes"
+  node_role_arn   = aws_iam_role.eks_nodes.arn
+  subnet_ids      = aws_subnet.private[*].id
+
+  instance_types = [var.node_instance_type]
+
+  scaling_config {
+    desired_size = var.node_count
+    max_size     = var.node_max_count
+    min_size     = var.node_min_count
+  }
+
+  update_config {
+    max_unavailable = 1
+  }
+
+  tags = var.tags
+
+  depends_on = [
+    aws_iam_role_policy_attachment.eks_worker_node_policy,
+    aws_iam_role_policy_attachment.eks_cni_policy,
+    aws_iam_role_policy_attachment.eks_ecr_readonly,
+  ]
+}

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

@@ -0,0 +1,26 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+output "cluster_name" {
+  description = "EKS cluster name"
+  value       = aws_eks_cluster.main.name
+}
+
+output "aws_region" {
+  description = "AWS region"
+  value       = var.region
+}
+
+output "oidc_issuer_url" {
+  description = "EKS OIDC issuer URL (for IRSA)"
+  value       = aws_eks_cluster.main.identity[0].oidc[0].issuer
+}
+
+output "oidc_provider_arn" {
+  description = "IAM OIDC provider ARN (for IRSA trust policies)"
+  value       = aws_iam_openid_connect_provider.eks.arn
+}
+
+output "vpc_id" {
+  description = "VPC ID"
+  value       = aws_vpc.main.id
+}

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

@@ -0,0 +1,12 @@
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+    tls = {
+      source  = "hashicorp/tls"
+      version = "~> 4.0"
+    }
+  }
+}

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

@@ -0,0 +1,61 @@
+# ─── Region ──────────────────────────────────────────────────────────
+
+variable "region" {
+  description = "AWS region (e.g., eu-west-1, us-east-1)"
+  type        = string
+}
+
+variable "prefix" {
+  description = "Prefix for resource names (e.g., clst-dev)"
+  type        = string
+}
+
+# ─── Networking ───────────────────────────────────────────────────────
+
+variable "vpc_cidr" {
+  description = "VPC CIDR block"
+  type        = string
+  default     = "10.100.0.0/16"
+}
+
+variable "availability_zones" {
+  description = "List of AZs for subnets (2–3 recommended)"
+  type        = list(string)
+}
+
+# ─── EKS Cluster ─────────────────────────────────────────────────────
+
+variable "node_instance_type" {
+  description = "EKS node instance type (e.g., t3.medium, m5.xlarge)"
+  type        = string
+}
+
+variable "node_count" {
+  description = "Desired number of EKS worker nodes"
+  type        = number
+}
+
+variable "node_min_count" {
+  description = "Minimum number of EKS worker nodes"
+  type        = number
+  default     = 1
+}
+
+variable "node_max_count" {
+  description = "Maximum number of EKS worker nodes"
+  type        = number
+}
+
+variable "kubernetes_version" {
+  description = "Kubernetes version for EKS (e.g., \"1.30\")"
+  type        = string
+  default     = "1.30"
+}
+
+# ─── Tags ─────────────────────────────────────────────────────────────
+
+variable "tags" {
+  description = "Tags applied to all resources"
+  type        = map(string)
+  default     = {}
+}

.tofu/platforms/eks/prod/main.tf

@@ -0,0 +1,21 @@
+module "cluster" {
+  source = "../modules/cluster"
+
+  region = var.region
+  prefix = "clst"
+
+  # VPC
+  availability_zones = ["${var.region}a", "${var.region}b", "${var.region}c"]
+
+  # EKS — general-purpose nodes for production
+  node_instance_type = "m5.xlarge"
+  node_count         = 3
+  node_min_count     = 3
+  node_max_count     = 6
+  kubernetes_version = "1.30"
+
+  tags = {
+    Environment = "prod"
+    ManagedBy   = "tofu"
+  }
+}

.tofu/platforms/eks/prod/outputs.tf

@@ -0,0 +1,5 @@
+output "cluster_name"    { value = module.cluster.cluster_name }
+output "aws_region"      { value = module.cluster.aws_region }
+output "oidc_issuer_url" { value = module.cluster.oidc_issuer_url }
+output "oidc_provider_arn" { value = module.cluster.oidc_provider_arn }
+output "vpc_id"          { value = module.cluster.vpc_id }

.tofu/platforms/eks/prod/providers.tf

@@ -0,0 +1,22 @@
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+    tls = {
+      source  = "hashicorp/tls"
+      version = "~> 4.0"
+    }
+  }
+}
+
+provider "aws" {
+  region = var.region
+}
+
+variable "region" {
+  description = "AWS region for prod environment"
+  type        = string
+  default     = "eu-west-1"
+}

.tofu/platforms/eks/workload/main.tf

@@ -0,0 +1,339 @@
+# =============================================================================
+# AWS Workload Cluster
+# =============================================================================
+# A lean EKS 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 aws-workload
+#   ./deploy-workload.sh --env aws-workload
+# =============================================================================
+
+variable "prefix" {
+  description = "Prefix for resource names (e.g., clst-workload)"
+  type        = string
+  default     = "clst-workload"
+}
+
+variable "availability_zones" {
+  description = "List of AZs for subnets"
+  type        = list(string)
+  default     = ["eu-west-1a", "eu-west-1b"]
+}
+
+variable "vpc_cidr" {
+  description = "VPC CIDR block"
+  type        = string
+  default     = "10.110.0.0/16"
+}
+
+variable "node_instance_type" {
+  description = "EKS node instance type"
+  type        = string
+  default     = "t3.medium"
+}
+
+variable "node_count" {
+  description = "Desired number of EKS worker nodes"
+  type        = number
+  default     = 2
+}
+
+variable "node_min_count" {
+  description = "Minimum number of EKS worker nodes"
+  type        = number
+  default     = 1
+}
+
+variable "node_max_count" {
+  description = "Maximum number of EKS worker nodes"
+  type        = number
+  default     = 4
+}
+
+variable "kubernetes_version" {
+  description = "Kubernetes version for EKS"
+  type        = string
+  default     = "1.30"
+}
+
+variable "domain" {
+  description = "Public domain name — must have an existing Route53 hosted zone"
+  type        = string
+}
+
+variable "tags" {
+  description = "Tags applied to all resources"
+  type        = map(string)
+  default = {
+    Environment = "workload"
+    ManagedBy   = "tofu"
+  }
+}
+
+# ─── VPC ──────────────────────────────────────────────────────────────
+
+resource "aws_vpc" "main" {
+  cidr_block           = var.vpc_cidr
+  enable_dns_hostnames = true
+  enable_dns_support   = true
+
+  tags = merge(var.tags, { Name = "${var.prefix}-vpc" })
+}
+
+resource "aws_internet_gateway" "main" {
+  vpc_id = aws_vpc.main.id
+  tags   = merge(var.tags, { Name = "${var.prefix}-igw" })
+}
+
+resource "aws_subnet" "public" {
+  count             = length(var.availability_zones)
+  vpc_id            = aws_vpc.main.id
+  cidr_block        = cidrsubnet(var.vpc_cidr, 4, count.index)
+  availability_zone = var.availability_zones[count.index]
+
+  map_public_ip_on_launch = true
+
+  tags = merge(var.tags, {
+    Name                                        = "${var.prefix}-public-${count.index + 1}"
+    "kubernetes.io/cluster/${var.prefix}-eks"   = "shared"
+    "kubernetes.io/role/elb"                    = "1"
+  })
+}
+
+resource "aws_subnet" "private" {
+  count             = length(var.availability_zones)
+  vpc_id            = aws_vpc.main.id
+  cidr_block        = cidrsubnet(var.vpc_cidr, 4, count.index + length(var.availability_zones))
+  availability_zone = var.availability_zones[count.index]
+
+  tags = merge(var.tags, {
+    Name                                        = "${var.prefix}-private-${count.index + 1}"
+    "kubernetes.io/cluster/${var.prefix}-eks"   = "shared"
+    "kubernetes.io/role/internal-elb"           = "1"
+  })
+}
+
+resource "aws_eip" "nat" {
+  domain = "vpc"
+  tags   = merge(var.tags, { Name = "${var.prefix}-nat-eip" })
+}
+
+resource "aws_nat_gateway" "main" {
+  allocation_id = aws_eip.nat.id
+  subnet_id     = aws_subnet.public[0].id
+  tags          = merge(var.tags, { Name = "${var.prefix}-nat" })
+
+  depends_on = [aws_internet_gateway.main]
+}
+
+resource "aws_route_table" "public" {
+  vpc_id = aws_vpc.main.id
+
+  route {
+    cidr_block = "0.0.0.0/0"
+    gateway_id = aws_internet_gateway.main.id
+  }
+
+  tags = merge(var.tags, { Name = "${var.prefix}-public-rt" })
+}
+
+resource "aws_route_table_association" "public" {
+  count          = length(var.availability_zones)
+  subnet_id      = aws_subnet.public[count.index].id
+  route_table_id = aws_route_table.public.id
+}
+
+resource "aws_route_table" "private" {
+  vpc_id = aws_vpc.main.id
+
+  route {
+    cidr_block     = "0.0.0.0/0"
+    nat_gateway_id = aws_nat_gateway.main.id
+  }
+
+  tags = merge(var.tags, { Name = "${var.prefix}-private-rt" })
+}
+
+resource "aws_route_table_association" "private" {
+  count          = length(var.availability_zones)
+  subnet_id      = aws_subnet.private[count.index].id
+  route_table_id = aws_route_table.private.id
+}
+
+# ─── EKS Cluster ──────────────────────────────────────────────────────
+
+resource "aws_iam_role" "eks_cluster" {
+  name_prefix = "${var.prefix}-eks-cluster-"
+
+  assume_role_policy = jsonencode({
+    Version = "2012-10-17"
+    Statement = [{
+      Action    = "sts:AssumeRole"
+      Effect    = "Allow"
+      Principal = { Service = "eks.amazonaws.com" }
+    }]
+  })
+
+  tags = var.tags
+}
+
+resource "aws_iam_role_policy_attachment" "eks_cluster_policy" {
+  policy_arn = "arn:aws:iam::aws:policy/AmazonEKSClusterPolicy"
+  role       = aws_iam_role.eks_cluster.name
+}
+
+resource "aws_eks_cluster" "main" {
+  name     = "${var.prefix}-eks"
+  role_arn = aws_iam_role.eks_cluster.arn
+  version  = var.kubernetes_version
+
+  vpc_config {
+    subnet_ids              = concat(aws_subnet.private[*].id, aws_subnet.public[*].id)
+    endpoint_private_access = true
+    endpoint_public_access  = true
+  }
+
+  access_config {
+    authentication_mode = "API_AND_CONFIG_MAP"
+  }
+
+  tags = var.tags
+
+  depends_on = [aws_iam_role_policy_attachment.eks_cluster_policy]
+}
+
+# OIDC provider — required for IRSA
+data "tls_certificate" "eks" {
+  url = aws_eks_cluster.main.identity[0].oidc[0].issuer
+}
+
+resource "aws_iam_openid_connect_provider" "eks" {
+  client_id_list  = ["sts.amazonaws.com"]
+  thumbprint_list = [data.tls_certificate.eks.certificates[0].sha1_fingerprint]
+  url             = aws_eks_cluster.main.identity[0].oidc[0].issuer
+
+  tags = var.tags
+}
+
+resource "aws_iam_role" "eks_nodes" {
+  name_prefix = "${var.prefix}-eks-nodes-"
+
+  assume_role_policy = jsonencode({
+    Version = "2012-10-17"
+    Statement = [{
+      Action    = "sts:AssumeRole"
+      Effect    = "Allow"
+      Principal = { Service = "ec2.amazonaws.com" }
+    }]
+  })
+
+  tags = var.tags
+}
+
+resource "aws_iam_role_policy_attachment" "eks_worker_node_policy" {
+  policy_arn = "arn:aws:iam::aws:policy/AmazonEKSWorkerNodePolicy"
+  role       = aws_iam_role.eks_nodes.name
+}
+
+resource "aws_iam_role_policy_attachment" "eks_cni_policy" {
+  policy_arn = "arn:aws:iam::aws:policy/AmazonEKS_CNI_Policy"
+  role       = aws_iam_role.eks_nodes.name
+}
+
+resource "aws_iam_role_policy_attachment" "eks_ecr_readonly" {
+  policy_arn = "arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly"
+  role       = aws_iam_role.eks_nodes.name
+}
+
+resource "aws_eks_node_group" "main" {
+  cluster_name    = aws_eks_cluster.main.name
+  node_group_name = "${var.prefix}-nodes"
+  node_role_arn   = aws_iam_role.eks_nodes.arn
+  subnet_ids      = aws_subnet.private[*].id
+
+  instance_types = [var.node_instance_type]
+
+  scaling_config {
+    desired_size = var.node_count
+    max_size     = var.node_max_count
+    min_size     = var.node_min_count
+  }
+
+  update_config {
+    max_unavailable = 1
+  }
+
+  tags = var.tags
+
+  depends_on = [
+    aws_iam_role_policy_attachment.eks_worker_node_policy,
+    aws_iam_role_policy_attachment.eks_cni_policy,
+    aws_iam_role_policy_attachment.eks_ecr_readonly,
+  ]
+}
+
+# ─── External-DNS IRSA ───────────────────────────────────────────────
+# Allows external-dns to manage Route53 records for app ingresses.
+
+data "aws_route53_zone" "main" {
+  name         = var.domain
+  private_zone = false
+}
+
+data "aws_iam_policy_document" "external_dns_assume_role" {
+  statement {
+    effect = "Allow"
+
+    principals {
+      type        = "Federated"
+      identifiers = [aws_iam_openid_connect_provider.eks.arn]
+    }
+
+    actions = ["sts:AssumeRoleWithWebIdentity"]
+
+    condition {
+      test     = "StringEquals"
+      variable = "${replace(aws_iam_openid_connect_provider.eks.url, "https://", "")}:sub"
+      values   = ["system:serviceaccount:external-dns:external-dns"]
+    }
+
+    condition {
+      test     = "StringEquals"
+      variable = "${replace(aws_iam_openid_connect_provider.eks.url, "https://", "")}:aud"
+      values   = ["sts.amazonaws.com"]
+    }
+  }
+}
+
+resource "aws_iam_role" "external_dns_irsa" {
+  name_prefix        = "${var.prefix}-external-dns-irsa-"
+  assume_role_policy = data.aws_iam_policy_document.external_dns_assume_role.json
+
+  tags = var.tags
+}
+
+data "aws_iam_policy_document" "external_dns_route53" {
+  statement {
+    effect    = "Allow"
+    actions   = ["route53:ChangeResourceRecordSets"]
+    resources = ["arn:aws:route53:::hostedzone/${data.aws_route53_zone.main.zone_id}"]
+  }
+
+  statement {
+    effect  = "Allow"
+    actions = ["route53:ListHostedZones", "route53:ListResourceRecordSets", "route53:ListTagsForResource"]
+    resources = ["*"]
+  }
+}
+
+resource "aws_iam_role_policy" "external_dns_route53" {
+  name_prefix = "${var.prefix}-external-dns-route53-"
+  role        = aws_iam_role.external_dns_irsa.id
+  policy      = data.aws_iam_policy_document.external_dns_route53.json
+}

.tofu/platforms/eks/workload/outputs.tf

@@ -0,0 +1,3 @@
+output "cluster_name"              { value = aws_eks_cluster.main.name }
+output "aws_region"                { value = var.region }
+output "external_dns_irsa_role_arn" { value = aws_iam_role.external_dns_irsa.arn }

.tofu/platforms/eks/workload/providers.tf

@@ -0,0 +1,24 @@
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+    tls = {
+      source  = "hashicorp/tls"
+      version = "~> 4.0"
+    }
+  }
+}
+
+# Authentication: set AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN
+# or configure an AWS profile: export AWS_PROFILE=clst
+provider "aws" {
+  region = var.region
+}
+
+variable "region" {
+  description = "AWS region for the workload environment"
+  type        = string
+  default     = "eu-west-1"
+}

.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

@@ -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 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"
+}

.tofu/platforms/upc/dev/main.tf

@@ -0,0 +1,14 @@
+module "cluster" {
+  source = "../modules/cluster"
+
+  prefix       = "clst-dev"
+  zone         = "no-svg1"
+  node_plan    = "DEV-1xCPU-2GB"
+  node_count   = 2
+  network_cidr = "10.100.0.0/24"
+
+  tags = {
+    Environment = "dev"
+    ManagedBy   = "tofu"
+  }
+}

.tofu/platforms/upc/dev/outputs.tf

@@ -0,0 +1,13 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+output "cluster_id" {
+  value = module.cluster.cluster_id
+}
+
+output "cluster_name" {
+  value = module.cluster.cluster_name
+}
+
+output "zone" {
+  value = module.cluster.zone
+}

.tofu/platforms/upc/dev/providers.tf

@@ -0,0 +1,14 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    upcloud = {
+      source  = "UpCloudLtd/upcloud"
+      version = "~> 5.0"
+    }
+  }
+}
+
+provider "upcloud" {
+  # Set via environment variables: UPCLOUD_USERNAME, UPCLOUD_PASSWORD
+}

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

@@ -0,0 +1,56 @@
+# Router for the private network
+resource "upcloud_router" "kubernetes" {
+  name = "${var.prefix}-${var.cluster_name}-router"
+}
+
+# Gateway for internet connectivity
+resource "upcloud_gateway" "kubernetes" {
+  name     = "${var.prefix}-${var.cluster_name}-gateway"
+  zone     = var.zone
+  features = ["nat"]
+  router {
+    id = upcloud_router.kubernetes.id
+  }
+}
+
+# Private network for the Kubernetes cluster
+resource "upcloud_network" "kubernetes" {
+  name   = "${var.prefix}-${var.cluster_name}-network"
+  zone   = var.zone
+  router = upcloud_router.kubernetes.id
+
+  ip_network {
+    address            = var.network_cidr
+    dhcp               = true
+    dhcp_default_route = true
+    family             = "IPv4"
+    gateway            = cidrhost(var.network_cidr, 1)
+  }
+
+  depends_on = [upcloud_gateway.kubernetes]
+}
+
+# Kubernetes cluster
+resource "upcloud_kubernetes_cluster" "main" {
+  name                    = "${var.prefix}-${var.cluster_name}"
+  zone                    = var.zone
+  network                 = upcloud_network.kubernetes.id
+  control_plane_ip_filter = var.control_plane_ip_filter
+
+  private_node_groups = true
+}
+
+# Node group for worker nodes
+resource "upcloud_kubernetes_node_group" "workers" {
+  cluster       = upcloud_kubernetes_cluster.main.id
+  name          = "${var.prefix}-${var.cluster_name}-workers"
+  node_count    = var.node_count
+  plan          = var.node_plan
+  anti_affinity = var.node_count > 1
+  labels = {
+    prefix  = var.prefix
+    cluster = var.cluster_name
+    role    = "worker"
+    env     = lookup(var.tags, "Environment", "dev")
+  }
+}

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

@@ -0,0 +1,31 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+output "cluster_id" {
+  description = "The ID of the Kubernetes cluster"
+  value       = upcloud_kubernetes_cluster.main.id
+}
+
+output "cluster_name" {
+  description = "The name of the Kubernetes cluster"
+  value       = upcloud_kubernetes_cluster.main.name
+}
+
+output "network_id" {
+  description = "The ID of the private network"
+  value       = upcloud_network.kubernetes.id
+}
+
+output "network_cidr" {
+  description = "The CIDR block of the private network"
+  value       = var.network_cidr
+}
+
+output "kubernetes_version" {
+  description = "The Kubernetes version of the cluster"
+  value       = upcloud_kubernetes_cluster.main.version
+}
+
+output "zone" {
+  description = "The zone where the cluster is deployed"
+  value       = var.zone
+}

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

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    upcloud = {
+      source  = "UpCloudLtd/upcloud"
+      version = "~> 5.0"
+    }
+  }
+}

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

@@ -0,0 +1,44 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+variable "prefix" {
+  description = "Prefix for resource names"
+  type        = string
+}
+
+variable "cluster_name" {
+  description = "Name of the Kubernetes cluster"
+  type        = string
+  default     = "main"
+}
+
+variable "zone" {
+  description = "UpCloud zone"
+  type        = string
+}
+
+variable "node_plan" {
+  description = "UpCloud server plan for worker nodes"
+  type        = string
+}
+
+variable "node_count" {
+  description = "Number of worker nodes"
+  type        = number
+}
+
+variable "network_cidr" {
+  description = "CIDR block for the private network"
+  type        = string
+  default     = "10.100.0.0/24"
+}
+
+variable "control_plane_ip_filter" {
+  description = "CIDRs allowed to access the K8s API"
+  type        = list(string)
+  default     = ["0.0.0.0/0"]
+}
+
+variable "tags" {
+  description = "Labels to apply to resources"
+  type        = map(string)
+}

.tofu/platforms/upc/prod/main.tf

@@ -0,0 +1,16 @@
+module "cluster" {
+  source = "../modules/cluster"
+
+  prefix       = "clst"
+  zone         = "de-fra1"
+  node_plan    = "4xCPU-8GB"
+  node_count   = 3
+  network_cidr = "10.100.0.0/24"
+
+  control_plane_ip_filter = ["0.0.0.0/0"] # TODO: restrict to known CIDRs
+
+  tags = {
+    Environment = "prod"
+    ManagedBy   = "tofu"
+  }
+}

.tofu/platforms/upc/prod/outputs.tf

@@ -0,0 +1,13 @@
+# ─── Cluster ─────────────────────────────────────────────────────────
+
+output "cluster_id" {
+  value = module.cluster.cluster_id
+}
+
+output "cluster_name" {
+  value = module.cluster.cluster_name
+}
+
+output "zone" {
+  value = module.cluster.zone
+}

.tofu/platforms/upc/prod/providers.tf

@@ -0,0 +1,14 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    upcloud = {
+      source  = "UpCloudLtd/upcloud"
+      version = "~> 5.0"
+    }
+  }
+}
+
+provider "upcloud" {
+  # Set via environment variables: UPCLOUD_USERNAME, UPCLOUD_PASSWORD
+}

.tofu/platforms/upc/workload/main.tf

@@ -0,0 +1,116 @@
+# =============================================================================
+# UpCloud Workload Cluster
+# =============================================================================
+# A lean UCS 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 upcloud-workload
+#   ./deploy-workload.sh --env upcloud-workload
+# =============================================================================
+
+variable "prefix" {
+  description = "Prefix for resource names"
+  type        = string
+  default     = "clst-workload"
+}
+
+variable "zone" {
+  description = "UpCloud zone"
+  type        = string
+  default     = "fi-hel1"
+}
+
+variable "node_plan" {
+  description = "UpCloud server plan for worker nodes"
+  type        = string
+  default     = "2xCPU-4GB"
+}
+
+variable "node_count" {
+  description = "Number of worker nodes"
+  type        = number
+  default     = 2
+}
+
+variable "network_cidr" {
+  description = "CIDR block for the private network"
+  type        = string
+  default     = "10.110.0.0/24"
+}
+
+variable "control_plane_ip_filter" {
+  description = "CIDRs allowed to access the K8s API"
+  type        = list(string)
+  default     = ["0.0.0.0/0"]
+}
+
+variable "tags" {
+  description = "Labels to apply to resources"
+  type        = map(string)
+  default = {
+    Environment = "workload"
+    ManagedBy   = "tofu"
+  }
+}
+
+# ─── Networking ───────────────────────────────────────────────────────
+
+resource "upcloud_router" "kubernetes" {
+  name = "${var.prefix}-workload-router"
+}
+
+resource "upcloud_gateway" "kubernetes" {
+  name     = "${var.prefix}-workload-gateway"
+  zone     = var.zone
+  features = ["nat"]
+  router {
+    id = upcloud_router.kubernetes.id
+  }
+}
+
+resource "upcloud_network" "kubernetes" {
+  name   = "${var.prefix}-workload-network"
+  zone   = var.zone
+  router = upcloud_router.kubernetes.id
+
+  ip_network {
+    address            = var.network_cidr
+    dhcp               = true
+    dhcp_default_route = true
+    family             = "IPv4"
+    gateway            = cidrhost(var.network_cidr, 1)
+  }
+
+  depends_on = [upcloud_gateway.kubernetes]
+}
+
+# ─── Kubernetes Cluster ───────────────────────────────────────────────
+
+resource "upcloud_kubernetes_cluster" "main" {
+  name                    = "${var.prefix}-workload"
+  zone                    = var.zone
+  network                 = upcloud_network.kubernetes.id
+  control_plane_ip_filter = var.control_plane_ip_filter
+
+  private_node_groups = true
+}
+
+resource "upcloud_kubernetes_node_group" "workers" {
+  cluster       = upcloud_kubernetes_cluster.main.id
+  name          = "${var.prefix}-workload-workers"
+  node_count    = var.node_count
+  plan          = var.node_plan
+  anti_affinity = var.node_count > 1
+  labels = {
+    prefix  = var.prefix
+    cluster = "workload"
+    role    = "worker"
+    env     = lookup(var.tags, "Environment", "workload")
+  }
+}

.tofu/platforms/upc/workload/outputs.tf

@@ -0,0 +1,3 @@
+output "cluster_name" { value = upcloud_kubernetes_cluster.main.name }
+output "cluster_id"   { value = upcloud_kubernetes_cluster.main.id }
+output "zone"         { value = var.zone }

.tofu/platforms/upc/workload/providers.tf

@@ -0,0 +1,14 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    upcloud = {
+      source  = "UpCloudLtd/upcloud"
+      version = "~> 5.0"
+    }
+  }
+}
+
+provider "upcloud" {
+  # Set via environment variables: UPCLOUD_USERNAME, UPCLOUD_PASSWORD
+}

.tofu/scripts/get-kubeconfig.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TOFU_ROOT="$(dirname "$SCRIPT_DIR")"
+PROJECT_ROOT="$(dirname "$TOFU_ROOT")"
+
+CLUSTER="${1:?Usage: $0 <cluster> (e.g., aks-dev, eks-prod)}"
+PLATFORM="${CLUSTER%%-*}"
+ENV="${CLUSTER#*-}"
+
+KUBECONFIG_FILE="$PROJECT_ROOT/private/$CLUSTER/kubeconfig"
+
+if [[ -f "$KUBECONFIG_FILE" ]]; then
+  echo "Kubeconfig already exists: $KUBECONFIG_FILE"
+  echo ""
+  echo "  export KUBECONFIG=$KUBECONFIG_FILE"
+else
+  echo "No cached kubeconfig. Fetching from platform..."
+
+  # Load platform credentials
+  ENV_FILE="$TOFU_ROOT/configs/$PLATFORM.env"
+  if [[ -f "$ENV_FILE" ]]; then
+    set -a; source "$ENV_FILE"; set +a
+  fi
+
+  TOFU_DIR="$TOFU_ROOT/platforms/$PLATFORM/$ENV"
+  mkdir -p "$(dirname "$KUBECONFIG_FILE")"
+
+  case "$PLATFORM" in
+    aks)
+      cd "$TOFU_DIR"
+      RG=$(tofu output -raw resource_group_name 2>/dev/null || echo "$CLUSTER-rg")
+      NAME=$(tofu output -raw cluster_name 2>/dev/null || echo "$CLUSTER")
+      az aks get-credentials --resource-group "$RG" --name "$NAME" --file "$KUBECONFIG_FILE" --overwrite-existing
+      ;;
+    eks)
+      cd "$TOFU_DIR"
+      NAME=$(tofu output -raw cluster_name 2>/dev/null || echo "$CLUSTER")
+      REGION=$(tofu output -raw aws_region 2>/dev/null || echo "${AWS_REGION:-eu-west-1}")
+      aws eks update-kubeconfig --name "$NAME" --region "$REGION" --kubeconfig "$KUBECONFIG_FILE"
+      ;;
+    gke)
+      cd "$TOFU_DIR"
+      NAME=$(tofu output -raw cluster_name 2>/dev/null || echo "$CLUSTER")
+      REGION=$(tofu output -raw region 2>/dev/null || echo "${GCP_REGION:-europe-west4}")
+      PROJECT=$(tofu output -raw project_id 2>/dev/null || echo "${GCP_PROJECT_ID:-}")
+      gcloud container clusters get-credentials "$NAME" --region "$REGION" --project "$PROJECT"
+      cp ~/.kube/config "$KUBECONFIG_FILE"
+      ;;
+    upc)
+      cd "$TOFU_DIR"
+      CLUSTER_ID=$(tofu output -raw cluster_id 2>/dev/null || echo "${UPCLOUD_CLUSTER_ID:-}")
+      upctl kubernetes config "$CLUSTER_ID" > "$KUBECONFIG_FILE"
+      ;;
+    *)
+      echo "Error: unknown platform '$PLATFORM'"
+      exit 1
+      ;;
+  esac
+
+  chmod 600 "$KUBECONFIG_FILE"
+  echo "Kubeconfig saved: $KUBECONFIG_FILE"
+  echo ""
+  echo "  export KUBECONFIG=$KUBECONFIG_FILE"
+fi

.tofu/scripts/setup-cluster.sh

@@ -0,0 +1,246 @@
+#!/bin/bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TOFU_ROOT="$(dirname "$SCRIPT_DIR")"
+PROJECT_ROOT="$(dirname "$TOFU_ROOT")"
+
+# ─── Usage ────────────────────────────────────────────────────────────
+usage() {
+  cat <<EOF
+Usage: $0 <cluster> [options]
+
+  Provision a Kubernetes cluster using OpenTofu.
+  Mirrors bootstrap.sh convention: cluster = <platform>-<env>
+
+  Clusters:   aks-dev | aks-prod | eks-dev | eks-prod
+              gke-dev | gke-prod | upc-dev | upc-prod
+              <platform>-workload (for workload clusters)
+
+  Options:
+    --plan        Plan only, don't apply
+    --destroy     Destroy the cluster (use teardown-cluster.sh instead)
+    --auto        Skip confirmation prompts
+    -h, --help    Show this help
+
+  Examples:
+    $0 aks-dev
+    $0 eks-prod --plan
+    $0 upc-dev --auto
+
+  Prerequisites:
+    - tofu, kubectl, helm installed
+    - Platform credentials in .tofu/configs/<platform>.env
+    - Cluster config in clusters/<cluster>.yaml
+
+  After provisioning, run:
+    ./bootstrap.sh <cluster>
+EOF
+  exit "${1:-0}"
+}
+
+# ─── Parse arguments ──────────────────────────────────────────────────
+CLUSTER=""
+PLAN_ONLY=false
+DESTROY=false
+AUTO_APPROVE=false
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --plan)       PLAN_ONLY=true; shift ;;
+    --destroy)    DESTROY=true; shift ;;
+    --auto)       AUTO_APPROVE=true; shift ;;
+    -h|--help)    usage 0 ;;
+    -*)           echo "Unknown option: $1"; usage 1 ;;
+    *)
+      if [[ -z "$CLUSTER" ]]; then
+        CLUSTER="$1"
+      else
+        echo "Error: unexpected argument '$1'"
+        usage 1
+      fi
+      shift
+      ;;
+  esac
+done
+
+[[ -z "$CLUSTER" ]] && { echo "Error: <cluster> argument required"; usage 1; }
+
+# ─── Map cluster → platform + env ────────────────────────────────────
+PLATFORM="${CLUSTER%%-*}"   # aks-dev → aks
+ENV="${CLUSTER#*-}"         # aks-dev → dev
+
+case "$PLATFORM" in
+  aks|eks|gke|upc) ;;
+  *) echo "Error: unknown platform '$PLATFORM'. Expected: aks, eks, gke, upc"; exit 1 ;;
+esac
+
+TOFU_DIR="$TOFU_ROOT/platforms/$PLATFORM/$ENV"
+if [[ ! -d "$TOFU_DIR" ]]; then
+  echo "Error: tofu directory not found: $TOFU_DIR"
+  echo "Available environments for $PLATFORM:"
+  ls -1 "$TOFU_ROOT/platforms/$PLATFORM/" 2>/dev/null | grep -v modules || echo "  (none)"
+  exit 1
+fi
+
+echo "========================================="
+echo "  Kubernetes Cluster Setup"
+echo "========================================="
+echo ""
+echo "  Cluster:   $CLUSTER"
+echo "  Platform:  $PLATFORM"
+echo "  Env:       $ENV"
+echo "  Tofu dir:  $TOFU_DIR"
+echo ""
+
+# ─── Prerequisites ────────────────────────────────────────────────────
+echo "=== Checking Prerequisites ==="
+command -v tofu    >/dev/null 2>&1 || { echo "Error: tofu is not installed."; exit 1; }
+command -v kubectl >/dev/null 2>&1 || { echo "Error: kubectl is not installed."; exit 1; }
+command -v helm    >/dev/null 2>&1 || { echo "Error: helm is not installed."; exit 1; }
+echo "  tofu, kubectl, helm: OK"
+
+# ─── Load platform credentials ────────────────────────────────────────
+ENV_FILE="$TOFU_ROOT/configs/$PLATFORM.env"
+if [[ -f "$ENV_FILE" ]]; then
+  echo "  Loading credentials from configs/$PLATFORM.env"
+  set -a
+  # shellcheck disable=SC1090
+  source "$ENV_FILE"
+  set +a
+else
+  echo "  Warning: $ENV_FILE not found — using existing environment/CLI auth"
+  echo "  Copy configs/$PLATFORM.env.example → configs/$PLATFORM.env to configure"
+fi
+
+# ─── Load cluster config (if exists) ──────────────────────────────────
+CLUSTER_CONFIG="$PROJECT_ROOT/clusters/$CLUSTER.yaml"
+if [[ -f "$CLUSTER_CONFIG" ]]; then
+  echo "  Loading cluster config from clusters/$CLUSTER.yaml"
+  if command -v yq >/dev/null 2>&1; then
+    eval "$(yq -r 'to_entries[] | "export CLUSTER_\(.key)=\"\(.value)\""' "$CLUSTER_CONFIG")"
+    echo "  Cluster name: ${CLUSTER_clusterName:-$CLUSTER}"
+  else
+    echo "  Warning: yq not installed — cluster config not loaded"
+  fi
+else
+  echo "  Warning: $CLUSTER_CONFIG not found — using defaults"
+fi
+echo ""
+
+# ─── Run OpenTofu ─────────────────────────────────────────────────────
+cd "$TOFU_DIR"
+
+echo "=== Initializing OpenTofu ==="
+tofu init
+
+echo ""
+if $DESTROY; then
+  echo "=== Planning Destruction ==="
+  tofu plan -destroy -out=tfplan
+
+  if ! $AUTO_APPROVE; then
+    echo ""
+    read -rp "DESTROY cluster $CLUSTER? This is irreversible. (yes/no) " REPLY
+    [[ "$REPLY" == "yes" ]] || { echo "Cancelled."; exit 1; }
+  fi
+
+  echo "Destroying infrastructure..."
+  tofu apply tfplan
+  echo ""
+  echo "=== Cluster $CLUSTER Destroyed ==="
+
+elif $PLAN_ONLY; then
+  echo "=== Planning Infrastructure ==="
+  tofu plan
+  echo ""
+  echo "=== Plan complete (--plan mode, no changes applied) ==="
+
+else
+  echo "=== Planning Infrastructure ==="
+  tofu plan -out=tfplan
+
+  if ! $AUTO_APPROVE; then
+    echo ""
+    read -rp "Apply this plan for $CLUSTER? (y/n) " -n 1 REPLY
+    echo
+    [[ "$REPLY" =~ ^[Yy]$ ]] || { echo "Cancelled."; exit 1; }
+  fi
+
+  echo "Applying infrastructure..."
+  tofu apply tfplan
+
+  # ─── Save kubeconfig ──────────────────────────────────────────────
+  KUBECONFIG_DIR="$PROJECT_ROOT/private/$CLUSTER"
+  mkdir -p "$KUBECONFIG_DIR"
+  KUBECONFIG_FILE="$KUBECONFIG_DIR/kubeconfig"
+
+  echo ""
+  echo "=== Saving Kubeconfig ==="
+
+  case "$PLATFORM" in
+    aks)
+      if tofu output -raw kubeconfig > "$KUBECONFIG_FILE" 2>/dev/null; then
+        echo "  Saved from tofu output"
+      else
+        echo "  Fetching from Azure CLI..."
+        RG=$(tofu output -raw resource_group_name 2>/dev/null || echo "${CLUSTER_clusterName:-$CLUSTER}-rg")
+        NAME=$(tofu output -raw cluster_name 2>/dev/null || echo "${CLUSTER_clusterName:-$CLUSTER}")
+        az aks get-credentials --resource-group "$RG" --name "$NAME" --file "$KUBECONFIG_FILE" --overwrite-existing
+      fi
+      ;;
+    eks)
+      NAME=$(tofu output -raw cluster_name 2>/dev/null || echo "${CLUSTER_clusterName:-$CLUSTER}")
+      REGION=$(tofu output -raw aws_region 2>/dev/null || echo "${AWS_REGION:-eu-west-1}")
+      aws eks update-kubeconfig --name "$NAME" --region "$REGION" --kubeconfig "$KUBECONFIG_FILE"
+      ;;
+    gke)
+      NAME=$(tofu output -raw cluster_name 2>/dev/null || echo "${CLUSTER_clusterName:-$CLUSTER}")
+      REGION=$(tofu output -raw region 2>/dev/null || echo "${GCP_REGION:-europe-west4}")
+      PROJECT=$(tofu output -raw project_id 2>/dev/null || echo "${GCP_PROJECT_ID:-}")
+      gcloud container clusters get-credentials "$NAME" --region "$REGION" --project "$PROJECT" 2>/dev/null \
+        && cp ~/.kube/config "$KUBECONFIG_FILE" \
+        || echo "  Warning: could not fetch kubeconfig via gcloud"
+      ;;
+    upc)
+      if tofu output -raw kubeconfig > "$KUBECONFIG_FILE" 2>/dev/null; then
+        echo "  Saved from tofu output"
+      else
+        CLUSTER_ID=$(tofu output -raw cluster_id 2>/dev/null || echo "${UPCLOUD_CLUSTER_ID:-}")
+        if [[ -n "$CLUSTER_ID" ]]; then
+          upctl kubernetes config "$CLUSTER_ID" > "$KUBECONFIG_FILE"
+        else
+          echo "  Warning: could not determine cluster ID for kubeconfig"
+        fi
+      fi
+      ;;
+  esac
+
+  if [[ -f "$KUBECONFIG_FILE" ]]; then
+    chmod 600 "$KUBECONFIG_FILE"
+    echo "  Kubeconfig: $KUBECONFIG_FILE"
+  fi
+
+  # ─── Wait for nodes ──────────────────────────────────────────────
+  echo ""
+  echo "=== Waiting for Cluster Nodes ==="
+  export KUBECONFIG="$KUBECONFIG_FILE"
+  if kubectl wait --for=condition=Ready nodes --all --timeout=300s 2>/dev/null; then
+    echo "  All nodes ready"
+  else
+    echo "  Warning: nodes not ready within timeout — check cluster status"
+  fi
+
+  # ─── Summary ─────────────────────────────────────────────────────
+  echo ""
+  echo "========================================="
+  echo "  Cluster $CLUSTER Provisioned"
+  echo "========================================="
+  echo ""
+  echo "  Kubeconfig: $KUBECONFIG_FILE"
+  echo ""
+  echo "  Next steps:"
+  echo "    export KUBECONFIG=$KUBECONFIG_FILE"
+  echo "    ./bootstrap.sh $CLUSTER"
+  echo ""
+fi

.tofu/scripts/teardown-cluster.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Delegate to setup-cluster.sh with --destroy flag
+exec "$SCRIPT_DIR/setup-cluster.sh" "$@" --destroy

README.md

@@ -80,8 +80,23 @@ This repository contains the complete GitOps configuration for our Kubernetes cl
 
 ```
 .
-├── bootstrap.sh                # Cluster initialization script
-├── _app-of-apps.yaml          # Root ArgoCD Application (App-of-Apps pattern)
+├── bootstrap.sh                # Cluster initialization (ArgoCD + GitOps)
+├── _app-of-apps-{cluster}.yaml # Root ArgoCD Application (per cluster)
+│
+├── .tofu/                     # Infrastructure provisioning (OpenTofu)
+│   ├── platforms/             # Per-platform IaC (one dir per cloud)
+│   │   ├── aks/               # Azure AKS (modules/ + dev/ + prod/ + workload/)
+│   │   ├── eks/               # AWS EKS
+│   │   ├── gke/               # GCP GKE
+│   │   └── upc/               # UpCloud
+│   ├── configs/               # Platform credentials (git-ignored)
+│   │   └── *.env.example      # Template for each platform
+│   └── scripts/               # Cluster lifecycle scripts
+│       ├── setup-cluster.sh   # Create cluster: ./setup-cluster.sh aks-dev
+│       ├── teardown-cluster.sh
+│       └── get-kubeconfig.sh
+│
+├── clusters/                  # Cluster metadata (domain, trustedIPs, etc.)
 │
 ├── infra/                     # Infrastructure ArgoCD Applications (Kustomize multi-cluster)
 │   ├── base/                  # Base ArgoCD Application manifests (one dir per component)

docs/GITOPS-ARCHITECTURE.md

@@ -115,9 +115,30 @@ This Kubernetes cluster uses a **GitOps approach** powered by **ArgoCD**, where
 
 ```
 launchpad/
-├── bootstrap.sh                      # Cluster initialization script
-├── _app-of-apps-upc-dev.yaml        # Root ArgoCD Application (upc-dev cluster)
-├── _app-of-apps-upc-prod.yaml       # Root ArgoCD Application (upc-prod cluster)
+├── bootstrap.sh                      # Cluster initialization (ArgoCD + GitOps)
+├── _app-of-apps-{cluster}.yaml      # Root ArgoCD Application (per cluster)
+│
+├── .tofu/                            # Infrastructure provisioning (OpenTofu)
+│   ├── platforms/                    # Per-platform IaC
+│   │   ├── aks/                      # Azure AKS
+│   │   │   ├── modules/cluster/     # Reusable AKS module
+│   │   │   ├── dev/                 # tofu root for aks-dev
+│   │   │   ├── prod/                # tofu root for aks-prod
+│   │   │   └── workload/            # workload cluster (no data services)
+│   │   ├── eks/                      # AWS EKS (same structure)
+│   │   ├── gke/                      # GCP GKE
+│   │   └── upc/                      # UpCloud
+│   ├── configs/                      # Platform credentials (git-ignored)
+│   │   └── {platform}.env.example   # Template per platform
+│   └── scripts/
+│       ├── setup-cluster.sh          # ./setup-cluster.sh <cluster> [--plan|--auto]
+│       ├── teardown-cluster.sh       # ./teardown-cluster.sh <cluster>
+│       └── get-kubeconfig.sh         # ./get-kubeconfig.sh <cluster>
+│
+├── clusters/                         # Cluster metadata YAML (domain, IPs, etc.)
+│   ├── aks-dev.yaml
+│   ├── upc-dev.yaml
+│   └── ...
 │
 ├── infra/                            # Infrastructure ArgoCD Applications (Kustomize)
 │   ├── base/                         # Base Application manifests (one dir per component)

docs/REFERENCE.md

@@ -72,9 +72,22 @@ Internet
 
 ```
 launchpad/
-├── bootstrap.sh                   # Cluster initialization script
-├── _app-of-apps-upc-dev.yaml     # Root ArgoCD Application (upc-dev)
-├── _app-of-apps-upc-prod.yaml    # Root ArgoCD Application (upc-prod)
+├── bootstrap.sh                   # Cluster initialization (ArgoCD + GitOps)
+├── _app-of-apps-{cluster}.yaml   # Root ArgoCD Application (per cluster)
+│
+├── .tofu/                         # Infrastructure provisioning (OpenTofu)
+│   ├── platforms/                 # Per-platform IaC
+│   │   ├── aks/                   # Azure: modules/cluster/, dev/, prod/, workload/
+│   │   ├── eks/                   # AWS: same structure
+│   │   ├── gke/                   # GCP
+│   │   └── upc/                   # UpCloud
+│   ├── configs/                   # Platform credentials (git-ignored)
+│   └── scripts/                   # setup-cluster.sh, teardown-cluster.sh, get-kubeconfig.sh
+│
+├── clusters/                      # Cluster metadata YAML
+│   ├── aks-dev.yaml
+│   ├── upc-dev.yaml
+│   └── ...
 │
 ├── infra/                         # Infrastructure applications (Kustomize)
 │   ├── base/                      # One subdirectory per component