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feat: Add support for CMEK in Autopilot GKE module (#2230)
Signed-off-by: drfaust92 <[email protected]> Co-authored-by: Ilia Lazebnik <[email protected]> Co-authored-by: Andrew Peabody <[email protected]>
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‎autogen/main/cluster.tf.tmpl‎

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@@ -203,10 +203,11 @@ resource "google_container_cluster" "primary" {
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{% if autopilot_cluster == true %}
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cluster_autoscaling {
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dynamic "auto_provisioning_defaults" {
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for_each = (var.create_service_account || var.service_account != "") ? [1] : []
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for_each = (var.create_service_account || var.service_account != "" || var.boot_disk_kms_key != null) ? [1] : []
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content {
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service_account = local.service_account
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service_account = local.service_account
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boot_disk_kms_key = var.boot_disk_kms_key
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}
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}
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}

‎autogen/main/variables.tf.tmpl‎

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@@ -447,14 +447,12 @@ variable "service_account_name" {
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default = ""
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}
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{% if autopilot_cluster != true %}
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variable "boot_disk_kms_key" {
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type = string
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description = "The Customer Managed Encryption Key used to encrypt the boot disk attached to each node in the node pool, if not overridden in `node_pools`. This should be of the form projects/[KEY_PROJECT_ID]/locations/[LOCATION]/keyRings/[RING_NAME]/cryptoKeys/[KEY_NAME]. For more information about protecting resources with Cloud KMS Keys please see: https://cloud.google.com/compute/docs/disks/customer-managed-encryption"
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default = null
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}
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{% endif %}
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variable "issue_client_certificate" {
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type = bool
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description = "Issues a client certificate to authenticate to the cluster endpoint. To maximize the security of your cluster, leave this option disabled. Client certificates don't automatically rotate and aren't easily revocable. WARNING: changing this after cluster creation is destructive!"

‎build/int.cloudbuild.yaml‎

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- verify simple-autopilot-private-non-default-sa
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name: 'gcr.io/cloud-foundation-cicd/$_DOCKER_IMAGE_DEVELOPER_TOOLS:$_DOCKER_TAG_VERSION_DEVELOPER_TOOLS'
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args: ['/bin/bash', '-c', 'cft test run TestSimpleAutopilotPrivateNonDefaultSA --stage teardown --verbose']
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- id: apply simple-autopilot-private-cmek
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waitFor:
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- init-all
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name: 'gcr.io/cloud-foundation-cicd/$_DOCKER_IMAGE_DEVELOPER_TOOLS:$_DOCKER_TAG_VERSION_DEVELOPER_TOOLS'
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args: ['/bin/bash', '-c', 'cft test run TestSimpleAutopilotPrivateCMEK --stage apply --verbose']
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- id: verify simple-autopilot-private-cmek
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waitFor:
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- apply simple-autopilot-private-cmek
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name: 'gcr.io/cloud-foundation-cicd/$_DOCKER_IMAGE_DEVELOPER_TOOLS:$_DOCKER_TAG_VERSION_DEVELOPER_TOOLS'
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args: ['/bin/bash', '-c', 'cft test run TestSimpleAutopilotPrivateCMEK --stage verify --verbose']
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- id: teardown simple-autopilot-private-cmek
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waitFor:
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- verify simple-autopilot-private-cmek
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name: 'gcr.io/cloud-foundation-cicd/$_DOCKER_IMAGE_DEVELOPER_TOOLS:$_DOCKER_TAG_VERSION_DEVELOPER_TOOLS'
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args: ['/bin/bash', '-c', 'cft test run TestSimpleAutopilotPrivateCMEK --stage teardown --verbose']
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- id: apply simple-fleet-app-operator-permissions
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waitFor:
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- init-all

‎examples/simple_autopilot_private_cmek/README.md‎

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# Simple Regional Autopilot Cluster
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This example illustrates how to create a simple autopilot cluster with beta features and
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using a Customer Managed Encryption Keys (CMEK).
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<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
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## Inputs
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| Name | Description | Type | Default | Required |
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|------|-------------|------|---------|:--------:|
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| project\_id | The project ID to host the cluster in | `any` | n/a | yes |
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## Outputs
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| Name | Description |
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|------|-------------|
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| boot\_disk\_kms\_key | CMEK used for disk encryption |
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| cluster\_name | Cluster name |
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| kubernetes\_endpoint | The cluster endpoint |
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| location | n/a |
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| master\_kubernetes\_version | Kubernetes version of the master |
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| network\_name | The name of the VPC being created |
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| region | The region in which the cluster resides |
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| service\_account | The service account to default running nodes as if not overridden in `node_pools`. |
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| subnet\_names | The names of the subnet being created |
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| zones | List of zones in which the cluster resides |
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<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
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To provision this example, run the following from within this directory:
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- `terraform init` to get the plugins
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- `terraform plan` to see the infrastructure plan
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- `terraform apply` to apply the infrastructure build
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- `terraform destroy` to destroy the built infrastructure

‎examples/simple_autopilot_private_cmek/main.tf‎

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/**
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* Copyright 2025 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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locals {
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cluster_type = "simple-autopilot-private-cmek"
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network_name = "simple-autopilot-private-cmek-network"
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subnet_name = "simple-autopilot-private-cmek-subnet"
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master_auth_subnetwork = "simple-autopilot-private-master-subnet"
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pods_range_name = "ip-range-pods-simple-autopilot-private"
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svc_range_name = "ip-range-svc-simple-autopilot-private"
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subnet_names = [for subnet_self_link in module.gcp-network.subnets_self_links : split("/", subnet_self_link)[length(split("/", subnet_self_link)) - 1]]
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}
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data "google_client_config" "default" {}
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data "google_project" "main" {
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project_id = var.project_id
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}
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module "kms" {
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source = "terraform-google-modules/kms/google"
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version = "~> 3.2"
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project_id = var.project_id
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key_protection_level = "HSM"
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location = "us-central1"
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keyring = "keyring"
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keys = ["key"]
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prevent_destroy = false
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}
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resource "google_kms_crypto_key_iam_member" "main" {
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crypto_key_id = values(module.kms.keys)[0]
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role = "roles/cloudkms.cryptoKeyEncrypterDecrypter"
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member = "serviceAccount:service-${data.google_project.main.number}@compute-system.iam.gserviceaccount.com"
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}
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provider "kubernetes" {
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host = "https://${module.gke.endpoint}"
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token = data.google_client_config.default.access_token
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cluster_ca_certificate = base64decode(module.gke.ca_certificate)
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}
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module "gke" {
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source = "terraform-google-modules/kubernetes-engine/google//modules/beta-autopilot-private-cluster"
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version = "~> 35.0"
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project_id = var.project_id
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name = "${local.cluster_type}-cluster"
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regional = true
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region = "us-central1"
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network = module.gcp-network.network_name
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subnetwork = local.subnet_names[index(module.gcp-network.subnets_names, local.subnet_name)]
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ip_range_pods = local.pods_range_name
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ip_range_services = local.svc_range_name
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release_channel = "REGULAR"
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enable_vertical_pod_autoscaling = true
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enable_private_endpoint = true
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enable_private_nodes = true
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network_tags = [local.cluster_type]
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deletion_protection = false
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boot_disk_kms_key = values(module.kms.keys)[0]
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depends_on = [google_kms_crypto_key_iam_member.main]
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}

‎examples/simple_autopilot_private_cmek/network.tf‎

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/**
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* Copyright 2025 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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module "gcp-network" {
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source = "terraform-google-modules/network/google"
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version = ">= 7.5"
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project_id = var.project_id
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network_name = local.network_name
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subnets = [
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{
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subnet_name = local.subnet_name
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subnet_ip = "10.0.0.0/17"
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subnet_region = "us-central1"
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subnet_private_access = true
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},
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{
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subnet_name = local.master_auth_subnetwork
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subnet_ip = "10.60.0.0/17"
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subnet_region = "us-central1"
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},
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]
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secondary_ranges = {
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(local.subnet_name) = [
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{
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range_name = local.pods_range_name
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ip_cidr_range = "192.168.0.0/18"
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},
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{
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range_name = local.svc_range_name
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ip_cidr_range = "192.168.64.0/18"
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},
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]
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}
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}

‎examples/simple_autopilot_private_cmek/outputs.tf‎

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/**
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* Copyright 2025 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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output "kubernetes_endpoint" {
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description = "The cluster endpoint"
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sensitive = true
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value = module.gke.endpoint
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}
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output "cluster_name" {
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description = "Cluster name"
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value = module.gke.name
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}
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output "location" {
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value = module.gke.location
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}
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output "master_kubernetes_version" {
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description = "Kubernetes version of the master"
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value = module.gke.master_version
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}
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output "service_account" {
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description = "The service account to default running nodes as if not overridden in `node_pools`."
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value = module.gke.service_account
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}
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output "network_name" {
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description = "The name of the VPC being created"
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value = module.gcp-network.network_name
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}
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output "subnet_names" {
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description = "The names of the subnet being created"
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value = module.gcp-network.subnets_names
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}
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output "region" {
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description = "The region in which the cluster resides"
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value = module.gke.region
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}
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output "zones" {
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description = "List of zones in which the cluster resides"
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value = module.gke.zones
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}
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output "boot_disk_kms_key" {
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description = "CMEK used for disk encryption"
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value = values(module.kms.keys)[0]
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}

‎examples/simple_autopilot_private_cmek/variables.tf‎

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/**
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* Copyright 2025 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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variable "project_id" {
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description = "The project ID to host the cluster in"
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}

‎examples/simple_autopilot_private_cmek/versions.tf‎

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/**
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* Copyright 2025 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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terraform {
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required_providers {
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google = {
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source = "hashicorp/google"
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}
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kubernetes = {
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source = "hashicorp/kubernetes"
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}
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}
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required_version = ">= 1.3"
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}

‎modules/beta-autopilot-private-cluster/README.md‎

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| additional\_ip\_range\_pods | List of _names_ of the additional secondary subnet ip ranges to use for pods | `list(string)` | `[]` | no |
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| allow\_net\_admin | (Optional) Enable NET\_ADMIN for the cluster. | `bool` | `null` | no |
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| authenticator\_security\_group | The name of the RBAC security group for use with Google security groups in Kubernetes RBAC. Group name must be in format [email protected] | `string` | `null` | no |
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| boot\_disk\_kms\_key | The Customer Managed Encryption Key used to encrypt the boot disk attached to each node in the node pool, if not overridden in `node_pools`. This should be of the form projects/[KEY\_PROJECT\_ID]/locations/[LOCATION]/keyRings/[RING\_NAME]/cryptoKeys/[KEY\_NAME]. For more information about protecting resources with Cloud KMS Keys please see: https://cloud.google.com/compute/docs/disks/customer-managed-encryption | `string` | `null` | no |
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| cluster\_ipv4\_cidr | The IP address range of the kubernetes pods in this cluster. Default is an automatically assigned CIDR. | `string` | `null` | no |
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| cluster\_resource\_labels | The GCE resource labels (a map of key/value pairs) to be applied to the cluster | `map(string)` | `{}` | no |
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| configure\_ip\_masq | Enables the installation of ip masquerading, which is usually no longer required when using aliasied IP addresses. IP masquerading uses a kubectl call, so when you have a private cluster, you will need access to the API server. | `bool` | `false` | no |

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