Overview:

Network policies define how Pods communicate with each other and external systems. They are essential for segmenting traffic and restricting unwanted access.

Example Network Policy:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-specific-namespace
  namespace: default
spec:
  podSelector:
    matchLabels:
      role: frontend
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          name: trusted-namespace

Steps:

1. Apply the policy:

   kubectl apply -f network-policy.yaml

2. Test communication between Pods:

   • Deploy Pods in different namespaces and validate traffic flow.

Activity:

Create a network policy to allow traffic only from a specific namespace to Pods labeled role: frontend.