Kubernetes Network Policies Explained: Secure Your Cluster

June 12, 2024 Hari Prasad Kubernetes (0) Security (0) #kubernetes (0) #network-policy (0) #security (0) #devops (0) #cni (0)

Kubernetes Network Policies allow you to control traffic flow at the IP address or port level between pods.

Why Use Network Policies?

  • Restrict traffic: Only allow necessary communication.
  • Zero trust: Default deny, explicitly allow.
  • Compliance: Meet security requirements.

Example: Deny All Ingress

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: deny-all-ingress
spec:
  podSelector: {}
  policyTypes:
    - Ingress

Best Practices

  • Start with a default deny policy.
  • Allow only required traffic.
  • Use labels for targeting pods.
  • Test policies in a staging environment.

Tools

  • Cilium, Calico, Weave: Popular CNI plugins with policy support.
  • kubectl: Apply and test policies.

Tags: kubernetes, network-policy, security, devops, cni

Categories: Kubernetes, Security