k8s-security-policies

To implement a default deny network policy in Kubernetes, define a NetworkPolicy object that selects all pods in the target namespace and leaves ingress and egress fields empty. This blocks all traffic to workloads until subsequent granular allow rules explicitly define permitted ingress and egress communication paths.

Enforce pod security standards in a production cluster by applying admission control policies that restrict pod specifications according to Privileged, Baseline, or Restricted levels. This prevents containers from running with excessive privileges, mitigating risks and ensuring workloads adhere to security best practices across your isolated namespaces.

Yes, you need to understand Kubernetes RBAC to set up least-privilege access control, as it requires configuring Roles, ClusterRoles, and Bindings for users and service accounts. This knowledge allows you to grant fine-grained permissions, ensuring teams only receive the specific access required to manage their applications.

The best way to isolate workloads in a multi-tenant Kubernetes cluster is by combining NetworkPolicies for network segmentation with RBAC for access control. This dual approach restricts both lateral traffic movement between namespaces and limits tenant permissions, securing the shared infrastructure effectively.

Network segmentation with Kubernetes NetworkPolicy works by using label selectors to define granular rules that control ingress and egress traffic between specific pods and namespaces. This creates isolated boundaries within the cluster, preventing unauthorized communication paths and limiting the blast radius of potential breaches.