COS node image not used

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Metadata

Id: ansible-gcp-cos-node-image-not-used

Provider: GCP

Platform: Ansible

Severity: Low

Category: Insecure Configurations

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Description

GKE node pools should use Container-Optimized OS (COS) images. COS is a Google-managed, hardened OS with automatic security updates and tighter integration with GKE, reducing exposure to unpatched vulnerabilities and kernel-level attack surface.

In Ansible, check tasks using the google.cloud.gcp_container_node_pool or gcp_container_node_pool modules and ensure the config.image_type property is defined and starts with COS (case-insensitive). Tasks missing config.image_type or with values that do not start with COS are flagged.

Secure configuration example:

- name: Create GKE node pool with COS image
  google.cloud.gcp_container_node_pool:
    name: my-node-pool
    initial_node_count: 3
    config:
      machine_type: e2-medium
      image_type: COS_CONTAINERD

Compliant Code Examples

- name: create a node pool
  google.cloud.gcp_container_node_pool:
    name: my-pool
    initial_node_count: 4
    cluster: '{{ cluster }}'
    location: us-central1-a
    project: test_project
    auth_kind: serviceaccount
    service_account_file: /tmp/auth.pem
    state: present
    config:
      image_type: COS

- name: create a node pool
  google.cloud.gcp_container_node_pool:
    name: my-pool
    initial_node_count: 4
    cluster: "{{ cluster }}"
    location: us-central1-a
    project: test_project
    auth_kind: serviceaccount
    service_account_file: /tmp/auth.pem
    state: present
    config:
      image_type: COS_CONTAINERD

Non-Compliant Code Examples

---
- name: create a node pool
  google.cloud.gcp_container_node_pool:
    name: my-pool
    initial_node_count: 4
    cluster: "{{ cluster }}"
    location: us-central1-a
    project: test_project
    auth_kind: serviceaccount
    service_account_file: "/tmp/auth.pem"
    state: present
    config:
      image_type: WINDOWS_LTSC