Egress Control in Kubernetes

Egress control helps restrict outbound traffic from Kubernetes Pods to external services, preventing data exfiltration and unauthorized communication.

Best Practices for Egress Control

1. Apply Egress Network Policies

Required knowledge for the CKS certification.

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: restrict-egress
  namespace: default
spec:
  podSelector:
    matchLabels:
      app: backend
  policyTypes:
    - Egress
  egress:
    - to:
        - ipBlock:
            cidr: 10.0.0.0/16

2. Restrict Public Internet Access

• Use proxy servers or NAT gateways to monitor and control outbound traffic.
• Prevent pods from directly reaching external IPs unless explicitly required.

3. Monitor Egress Traffic

• Use logging and monitoring tools like Falco and Egress gateways to detect suspicious activity.

Egress controls enhance Kubernetes security by preventing data leaks and limiting external exposure.