k8s-security-policies

To secure a multi-tenant Kubernetes cluster, you implement NetworkPolicy resources to define rules for traffic flow between pods and namespaces, achieving network isolation. This isolates workloads and prevents unauthorized lateral traffic across tenants.

Kubernetes pod security standards enforce security configurations for pods using privileged, baseline, and restricted tiers. They restrict capabilities to ensure workloads run with appropriate privileges, enforcing defense-in-depth security within the cluster.

You configure Role-Based Access Control (RBAC) for least-privilege access control by defining granular permissions for users and services. This ensures subjects only have the minimum permissions required to perform their tasks.

Yes, this approach supports implementing a default deny-all network policy for a namespace. By defining a NetworkPolicy that selects all pods and denies all ingress and egress traffic, you establish a secure baseline for production namespaces.

You should apply admission control mechanisms for Kubernetes security when you need to enforce compliance and validate requests before objects persist in the cluster. This provides defense-in-depth by intercepting and evaluating API requests dynamically.