In Kubernetes, access control is the difference between a secure system and a breach waiting to happen. NIST 800-53 turns that difference into defined, enforceable rules.
Kubernetes access must be mapped to NIST 800-53 control families. The most relevant are AC (Access Control), IA (Identification and Authentication), and AU (Audit and Accountability). For AC, use Role-Based Access Control (RBAC) to assign the least privileges possible. Bind roles to service accounts, not directly to users, and audit those bindings regularly. For IA, enforce strong identity practices across the cluster; integrate with centralized identity providers and require multifactor authentication. For AU, capture every access event in audit logs. Forward logs to an immutable storage or SIEM where changes cannot be tampered with.
NIST 800-53 expects continuous monitoring. In Kubernetes, this is more than turning on audit logs—it means real-time detection of unauthorized access attempts. Configure admission controllers that reject unknown service accounts and alert on failed authentication. Implement network policies to isolate workloads so a compromised pod cannot move laterally.