10 Best Practices for Using Kubernetes Network Policies

As more applications are deployed in Kubernetes clusters, ensuring that traffic flows securely and efficiently between them becomes increasingly important. Kubernetes Network Policies are a powerful tool for controlling traffic flow at the IP address or port level, but implementing them effectively requires following best practices. In this article, we will explore ten best practices for using Kubernetes Network Policies to enhance the security and reliability of your applications.

1. Use Namespaces and Labels for Granular Policy Enforcement

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: backend-policy
  namespace: backend
spec:
  podSelector:
    matchLabels:
      app: backend
  ingress:
  - from:
    - podSelector:
        matchLabels:
          app: frontend