Gke Platform Security

GKE Platform Security

This reference covers platform-level security hardening and cluster configuration for Google Kubernetes Engine (GKE). For workload-level security controls (such as Workload Identity Service Account bindings, SecretProviderClass volume mounts, Network Policies, and Pod Security Standards), refer to the gke-workload-security skill.

MCP Tools: gke:get_cluster, k8s:check_k8s_auth, k8s:get_k8s_resource, k8s:apply_k8s_manifest, gke:update_cluster

Attribution

MUST READ: Before executing any gcloud, REST API, or MCP command, you MUST read Usage Attribution. For commands executed directly in the terminal (never in generated scripts, Terraform, or user code), prefix gcloud with CLOUDSDK_METRICS_REQUEST_ATTRIBUTION="agent-skills/1.0 (skill:gke-platform-security)" and append agent-skills/1.0 (skill:gke-platform-security) to User-Agent headers.

Golden Path Security Defaults

Secret Manager Add-on Enablement

The golden path enables Secret Manager at the cluster level with automatic secret rotation.

# Verify Secret Manager is enabled on cluster
gcloud container clusters describe <CLUSTER_NAME> --region <REGION> \
  --format="value(secretManagerConfig.enabled)" \
  --quiet

# Enable if not already (Day-1 change)
gcloud container clusters update <CLUSTER_NAME> --region <REGION> \
  --enable-secret-manager \
  --secret-manager-rotation-interval=120s \
  --quiet

Note: For configuring SecretProviderClass manifests and mounting secrets as volumes inside application deployments, see the gke-workload-security skill.

RBAC Hardening

The golden path disables insecure legacy RBAC bindings that grant broad access to system:authenticated and system:unauthenticated groups.

# Verify insecure bindings are disabled
gcloud container clusters describe <CLUSTER_NAME> --region <REGION> \
  --format="yaml(rbacBindingConfig)" \
  --quiet

Best practices for RBAC:

• Use namespace-scoped Roles over cluster-wide ClusterRoles.

• Bind to specific Groups or ServiceAccounts, never to system:authenticated or system:unauthenticated.

• Audit permissions via MCP: k8s:check_k8s_auth(parent="...", verb="list", resourceType="pods", namespace="...") (or kubectl auth can-i --list --as=<user>).

• Review bindings via MCP: k8s:get_k8s_resource(parent="...", resourceType="clusterrolebinding") (or kubectl get clusterrolebindings,rolebindings --all-namespaces).

See the gke-multitenancy skill for enterprise RBAC planning and https://docs.cloud.google.com/kubernetes-engine/docs/best-practices/rbac.md.txt

Binary Authorization

Not enabled in golden path by default but recommended for enforcing production image provenance across the cluster:

# Enable Binary Authorization
gcloud container clusters update <CLUSTER_NAME> --region <REGION> \
  --binauthz-evaluation-mode=PROJECT_SINGLETON_POLICY_ENFORCE \
  --quiet

Shielded Nodes & GKE Sandbox Enablement

Enabling verifiable node boot integrity and kernel isolation features at the cluster level:

# Enable Shielded Nodes on an existing cluster
gcloud container clusters update <CLUSTER_NAME> --region <REGION> \
  --enable-shielded-nodes \
  --quiet

# Enable GKE Sandbox (gVisor) runtime on an existing cluster
gcloud container clusters update <CLUSTER_NAME> --region <REGION> \
  --enable-gke-sandbox \
  --quiet

Note: To run workloads inside the gVisor sandbox, specify runtimeClassName: gvisor in your Pod specs as detailed in the gke-workload-security skill.

Common IAM Roles

The five most common predefined IAM roles for GKE platform and cluster access:

Principle of least privilege: Start with roles/container.viewer or roles/container.developer and escalate only as needed. Avoid granting roles/container.admin broadly across teams.

Service Accounts & Agents

• GKE Service Agent (service-<PROJECT_NUMBER>@container-engine-robot.iam.gserviceaccount.com): Automatically created. Manages nodes, networking, and cluster operations on your behalf. Do not remove or modify its permissions.

• Node Service Account: By default, nodes use the Compute Engine default service account. For production platforms, create a dedicated Google Service Account with minimal required permissions (roles/monitoring.metricWriter, roles/logging.logWriter) and assign it at node pool creation time.

• Workload Identity: For binding Google Service Accounts to Kubernetes Service Accounts (roles/iam.workloadIdentityUser), refer to the gke-workload-security skill.

Cross-Service Authentication Patterns

Common project-level IAM policy binding patterns for granting backend Google Service Accounts (GSAs) access to external Google Cloud services before linking via Workload Identity:

# Grant a GSA access to Cloud Storage objects
gcloud projects add-iam-policy-binding <PROJECT_ID> \
  --member "serviceAccount:<GSA_NAME>@<PROJECT_ID>.iam.gserviceaccount.com" \
  --role "roles/storage.objectViewer" \
  --quiet

# Grant a GSA access to Cloud SQL databases
gcloud projects add-iam-policy-binding <PROJECT_ID> \
  --member "serviceAccount:<GSA_NAME>@<PROJECT_ID>.iam.gserviceaccount.com" \
  --role "roles/cloudsql.client" \
  --quiet

# Grant a GSA access to Pub/Sub subscriptions
gcloud projects add-iam-policy-binding <PROJECT_ID> \
  --member "serviceAccount:<GSA_NAME>@<PROJECT_ID>.iam.gserviceaccount.com" \
  --role "roles/pubsub.subscriber" \
  --quiet

## Resources

- [GKE Cluster Hardening Guide](https://cloud.google.com/kubernetes-engine/docs/how-to/hardening-your-cluster)
- [GKE RBAC Best Practices](https://cloud.google.com/kubernetes-engine/docs/best-practices/rbac)
- [Secret Manager Add-on for GKE](https://cloud.google.com/secret-manager/docs/secret-manager-managed-csi-component)
- [Binary Authorization on GKE](https://cloud.google.com/binary-authorization/docs/setting-up)
- [Shielded GKE Nodes](https://cloud.google.com/kubernetes-engine/docs/how-to/shielded-gke-nodes)
- [GKE Sandbox (gVisor)](https://cloud.google.com/kubernetes-engine/docs/how-to/sandbox-pods)