feat(gke): add node system config (terraform-google-modules#802)

Author: apeabody

gke/standard/regional/node_system_config/main.tf

@@ -0,0 +1,50 @@
+/**
+* Copyright 2025 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.
+*/
+
+# [START gke_standard_regional_node_system_config]
+resource "google_container_cluster" "default" {
+  name     = "gke-standard-regional-cluster"
+  location = "us-central1"
+
+  initial_node_count = 1
+
+  node_config {
+    # Kubelet configuration
+    kubelet_config {
+      cpu_manager_policy = "static"
+    }
+
+    linux_node_config {
+      # Sysctl configuration
+      sysctls = {
+        "net.core.netdev_max_backlog" = "10000"
+      }
+
+      # Linux cgroup mode configuration
+      cgroup_mode = "CGROUP_MODE_V2"
+
+      # Linux huge page configuration
+      hugepages_config {
+        hugepage_size_2m = "1024"
+      }
+    }
+  }
+
+  # Set `deletion_protection` to `true` will ensure that one cannot
+  # accidentally delete this instance by use of Terraform.
+  deletion_protection = false
+}
+# [END gke_standard_regional_node_system_config]