In Kubernetes, the real perimeter is the network policy you define—and what you fail to define. A single misstep can expose internal services or allow lateral movement across pods. This is why a Kubernetes Network Policies Quarterly Check-In is not optional. It’s operational hygiene.
Kubernetes network policies control how pods communicate with each other and with external endpoints. They are enforced by the network plugin (CNI) you run, and they work at the IP and port level. The default is wide open: all ingress and egress traffic is allowed unless restricted. Without regular review, stale rules accumulate, unused ports stay open, and new deployments bypass intended restrictions.
A quarterly check-in ensures your policy set matches current workloads. Review all namespaces. Confirm each pod runs under an appropriate policy. Remove outdated allow rules tied to decommissioned services. Verify team conventions: default deny all ingress, selectively allow egress, and scope rules tightly with labels.
Test enforcement across environments. Apply updated policies in staging first and simulate blocked connections. Use kubectl describe and network policy viewers to ensure intended coverage. Cross-reference with recent deployments and automated scans for uncovered pods. If your CNI supports it, enable logging for denied connections to spot missed pathways.