feat(GKE): add IAP example

gke/autopilot/iap/main.tf

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+/**
+* Copyright 2024 Google LLC
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+# The kubernetes_manifest resource can only be used with pre-existing clusters.
+# To create the cluster in advance run:
+# `terraform apply -target=google_container_cluster.default`
+resource "google_container_cluster" "default" {
+  name     = "gke-autopilot-basic"
+  location = "us-central1"
+
+  enable_autopilot = true
+
+  # Set `deletion_protection` to `true` will ensure that one cannot
+  # accidentally delete this instance by use of Terraform.
+  deletion_protection = false
+}
+
+# Required for internal ingress
+resource "google_compute_subnetwork" "default" {
+  name          = "proxy-subnetwork"
+  ip_cidr_range = "10.2.0.0/16"
+  region        = google_container_cluster.default.location
+  network       = "default"
+  purpose       = "REGIONAL_MANAGED_PROXY"
+  role          = "ACTIVE"
+}
+
+# Required for internal ingress
+resource "google_compute_address" "default" {
+  name         = "hello-app-ip"
+  address_type = "INTERNAL"
+  region       = google_container_cluster.default.location
+  purpose      = "SHARED_LOADBALANCER_VIP"
+}
+
+data "google_client_config" "default" {}
+
+provider "kubernetes" {
+  host                   = "https://${google_container_cluster.default.endpoint}"
+  token                  = data.google_client_config.default.access_token
+  cluster_ca_certificate = base64decode(google_container_cluster.default.master_auth[0].cluster_ca_certificate)
+}
+
+# [START gke_autopilot_iap_deployment]
+resource "kubernetes_deployment_v1" "default" {
+  metadata {
+    name = "hello-app-deployment"
+  }
+
+  spec {
+    selector {
+      match_labels = {
+        app = "hello-app"
+      }
+    }
+
+    template {
+      metadata {
+        labels = {
+          app = "hello-app"
+        }
+      }
+
+      spec {
+        container {
+          image = "us-docker.pkg.dev/google-samples/containers/gke/hello-app:2.0"
+          name  = "hello-app-container"
+
+          port {
+            container_port = 8080
+            name           = "hello-app-svc"
+          }
+
+          security_context {
+            allow_privilege_escalation = false
+            privileged                 = false
+            read_only_root_filesystem  = false
+
+            capabilities {
+              add  = []
+              drop = ["NET_RAW"]
+            }
+          }
+
+          liveness_probe {
+            http_get {
+              path = "/"
+              port = "hello-app-svc"
+
+              http_header {
+                name  = "X-Custom-Header"
+                value = "Awesome"
+              }
+            }
+
+            initial_delay_seconds = 3
+            period_seconds        = 3
+          }
+        }
+
+        security_context {
+          run_as_non_root = true
+
+          seccomp_profile {
+            type = "RuntimeDefault"
+          }
+        }
+
+        # Toleration is currently required to prevent perpetual diff:
+        # https://github.com/hashicorp/terraform-provider-kubernetes/pull/2380
+        toleration {
+          effect   = "NoSchedule"
+          key      = "kubernetes.io/arch"
+          operator = "Equal"
+          value    = "amd64"
+        }
+      }
+    }
+  }
+
+  lifecycle {
+    ignore_changes = [
+      metadata[0].annotations["autopilot.gke.io/resource-adjustment"],
+      metadata[0].annotations["autopilot.gke.io/warden-version"]
+    ]
+  }
+}
+# [END gke_autopilot_iap_deployment]
+
+# [START gke_autopilot_iap_service]
+resource "kubernetes_service_v1" "default" {
+  metadata {
+    name = "hello-app-service"
+    annotations = {
+      "cloud.google.com/backend-config" = "{\"ports\": {\"80\":\"${kubernetes_manifest.backendconfig.manifest.metadata.name}\"}}"
+      "cloud.google.com/neg"            = "{\"ingress\": true}"
+    }
+  }
+
+  spec {
+    type = "ClusterIP"
+
+    selector = {
+      app = kubernetes_deployment_v1.default.spec[0].selector[0].match_labels.app
+    }
+
+    port {
+      port        = 80
+      protocol    = kubernetes_deployment_v1.default.spec[0].template[0].spec[0].container[0].port[0].protocol
+      target_port = kubernetes_deployment_v1.default.spec[0].template[0].spec[0].container[0].port[0].container_port
+    }
+  }
+
+  lifecycle {
+    ignore_changes = [
+      metadata[0].annotations["cloud.google.com/neg-status"]
+    ]
+  }
+
+  depends_on = [time_sleep.wait_service_cleanup]
+}
+# [END gke_autopilot_iap_service]
+
+# [START gke_autopilot_iap_ingress]
+resource "kubernetes_ingress_v1" "default" {
+  metadata {
+    name = "hello-app-ingress"
+    annotations = {
+      "kubernetes.io/ingress.class"                   = "gce-internal" # Remove to create an external
+      "ingress.gcp.kubernetes.io/pre-shared-cert"     = google_compute_region_ssl_certificate.default.name
+      "kubernetes.io/ingress.regional-static-ip-name" = google_compute_address.default.name
+    }
+  }
+
+  spec {
+    rule {
+      http {
+        path {
+          path      = "/"
+          path_type = "Prefix"
+          backend {
+            service {
+              name = kubernetes_service_v1.default.metadata[0].name
+              port {
+                number = 80
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  depends_on = [
+    time_sleep.wait_service_cleanup,
+    google_compute_subnetwork.default,
+    google_compute_region_ssl_certificate.default
+  ]
+}
+# [END gke_autopilot_iap_ingress]
+
+# [START gke_autopilot_iap_backendconfig]
+resource "kubernetes_manifest" "backendconfig" {
+  manifest = {
+    apiVersion = "cloud.google.com/v1"
+    kind       = "BackendConfig"
+
+    metadata = {
+      name      = "backendconfig"
+      namespace = "default"
+    }
+
+    spec = {
+      iap = {
+        enabled = true
+      }
+      timeoutSec = 40
+      connectionDraining = {
+        drainingTimeoutSec = 60
+      }
+    }
+  }
+
+  depends_on = [time_sleep.wait_service_cleanup]
+}
+# [END gke_autopilot_iap_backendconfig]
+
+# self-signed cert for internal ingress
+resource "google_compute_region_ssl_certificate" "default" {
+  name_prefix = "iap-certificate-"
+  private_key = tls_private_key.default.private_key_pem
+  certificate = tls_self_signed_cert.default.cert_pem
+  region      = google_container_cluster.default.location
+  lifecycle {
+    create_before_destroy = true
+  }
+}
+
+resource "tls_private_key" "default" {
+  algorithm = "RSA"
+}
+
+resource "tls_self_signed_cert" "default" {
+  private_key_pem = tls_private_key.default.private_key_pem
+
+  validity_period_hours = 12
+  early_renewal_hours   = 3
+
+  allowed_uses = [
+    "key_encipherment",
+    "digital_signature",
+    "server_auth",
+  ]
+
+  dns_names = ["localhost"]
+
+  subject {
+    common_name  = "localhost"
+    organization = "terrraform-docs-samples"
+  }
+}
+
+# Provide time for service cleanup
+resource "time_sleep" "wait_service_cleanup" {
+  depends_on = [google_container_cluster.default]
+
+  destroy_duration = "180s"
+}

gke/autopilot/iap/test.yaml

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+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# The kubernetes_manifest resource can only be used with pre-existing clusters.
+apiVersion: blueprints.cloud.google.com/v1alpha1
+kind: BlueprintTest
+metadata:
+  name: gke_autopilot_iap
+spec:
+  skip: true