feat: Implement and configure GKE Image Streaming (GCFS) at the cluster level. (#5387)

Co-authored-by: Swarna Bharathi Mantena <swarnabm@google.com>

Author: raushan2016

modules/scheduler/gke-cluster/README.md

@@ -156,6 +156,7 @@ limitations under the License.
 | <a name="input_enable_dcgm_monitoring"></a> [enable\_dcgm\_monitoring](#input\_enable\_dcgm\_monitoring) | Enable GKE to collect DCGM metrics | `bool` | `true` | no |
 | <a name="input_enable_external_dns_endpoint"></a> [enable\_external\_dns\_endpoint](#input\_enable\_external\_dns\_endpoint) | Allow [DNS-based approach](https://cloud.google.com/kubernetes-engine/docs/concepts/network-isolation#dns-based_endpoint) for accessing the GKE control plane.<br/>Refer this [dedicated blog](https://cloud.google.com/blog/products/containers-kubernetes/new-dns-based-endpoint-for-the-gke-control-plane) for more details. | `bool` | `false` | no |
 | <a name="input_enable_filestore_csi"></a> [enable\_filestore\_csi](#input\_enable\_filestore\_csi) | The status of the Filestore Container Storage Interface (CSI) driver addon, which allows the usage of filestore instance as volumes. | `bool` | `false` | no |
+| <a name="input_enable_gcfs"></a> [enable\_gcfs](#input\_enable\_gcfs) | Enable the Google Container Filesystem (GCFS) for Image Streaming at the cluster level. | `bool` | `false` | no |
 | <a name="input_enable_gcsfuse_csi"></a> [enable\_gcsfuse\_csi](#input\_enable\_gcsfuse\_csi) | The status of the GCSFuse Container Storage Interface (CSI) driver addon, which allows the usage of a GCS bucket as volumes. | `bool` | `false` | no |
 | <a name="input_enable_inference_gateway"></a> [enable\_inference\_gateway](#input\_enable\_inference\_gateway) | If true, enables GKE features required for Inference Gateway, including the HttpLoadBalancing addon, and installs required CRDs. | `bool` | `false` | no |
 | <a name="input_enable_k8s_beta_apis"></a> [enable\_k8s\_beta\_apis](#input\_enable\_k8s\_beta\_apis) | List of Enabled Kubernetes Beta APIs. | `list(string)` | `null` | no |

modules/scheduler/gke-cluster/main.tf

@@ -254,6 +254,17 @@ resource "google_container_cluster" "gke_cluster" {
     update = var.timeout_update
   }
 
+  dynamic "node_pool_defaults" {
+    for_each = var.enable_gcfs ? [1] : []
+    content {
+      node_config_defaults {
+        gcfs_config {
+          enabled = true
+        }
+      }
+    }
+  }
+
   node_config {
     shielded_instance_config {
       enable_secure_boot          = var.system_node_pool_enable_secure_boot

modules/scheduler/gke-cluster/variables.tf

@@ -179,12 +179,19 @@ variable "enable_filestore_csi" {
   default     = false
 }
 
+variable "enable_gcfs" {
+  description = "Enable the Google Container Filesystem (GCFS) for Image Streaming at the cluster level."
+  type        = bool
+  default     = false
+}
+
 variable "enable_gcsfuse_csi" {
   description = "The status of the GCSFuse Container Storage Interface (CSI) driver addon, which allows the usage of a GCS bucket as volumes."
   type        = bool
   default     = false
 }
 
+
 variable "enable_persistent_disk_csi" {
   description = "The status of the Google Compute Engine Persistent Disk Container Storage Interface (CSI) driver addon, which allows the usage of a PD as volumes."
   type        = bool