KUBERNETES SECURITY FUNDAMENTALS: NETWORKING

Summary from the TLDR InfoSec newsletter

Kubernetes clusters use a flat network that allows all pods to communicate, which poses security risks. To secure the network, deploy CNI plugins like Calico or Cilium that support policies, then set default-deny ingress/egress rules, allowing only necessary traffic between pods and namespaces. Essential measures include restricting host networking, shielding cloud metadata from pod egress, and testing network policies with application manifests before production.