Harden the Control Plane
Restrict API-server access, protect etcd, enable audit logging and keep supported versions current. Administrative access should use strong identity, short-lived credentials and separate emergency paths.
Workload Isolation
Apply Pod Security Standards, non-root execution, read-only filesystems and dropped Linux capabilities. Use namespaces for ownership but network policies and authorization for real isolation.
RBAC and Service Accounts
Disable automatic token mounting where unnecessary, create narrowly scoped service accounts and regularly review cluster roles. Avoid wildcard verbs and resources.
Supply Chain and Runtime
- Sign and verify container images
- Scan dependencies and base images
- Enforce approved registries and deployment policies
- Detect unexpected processes, network connections and privilege changes
Secrets
Encrypt secrets at rest, integrate an external secret manager and prevent credentials from entering images, manifests or logs.
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