LOW
Source
Trivy
ID
AVD-GCP-0054

Ensure Container-Optimized OS (cos) is used for Kubernetes Engine Clusters Node image

GKE supports several OS image types but COS is the recommended OS image to use on cluster nodes for enhanced security

Impact

Follow the appropriate remediation steps below to resolve the issue.

Use the COS image type

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resource "google_service_account" "default" {
  account_id   = "service-account-id"
  display_name = "Service Account"
}

resource "google_container_cluster" "primary" {
  name     = "my-gke-cluster"
  location = "us-central1"

  # We can't create a cluster with no node pool defined, but we want to only use
  # separately managed node pools. So we create the smallest possible default
  # node pool and immediately delete it.
  remove_default_node_pool = true
  initial_node_count       = 1
}

resource "google_container_node_pool" "good_example" {
  name       = "my-node-pool"
  cluster    = google_container_cluster.primary.id
  node_count = 1

  node_config {
    preemptible  = true
    machine_type = "e2-medium"

    # Google recommends custom service accounts that have cloud-platform scope and permissions granted via IAM Roles.
    service_account = google_service_account.default.email
    oauth_scopes = [
      "https://www.googleapis.com/auth/cloud-platform"
    ]
    image_type = "COS"
  }
}