Network Policies with VPC CNI

Overview

Kubernetes Network Policies control traffic between pods. The VPC CNI supports Calico network policies.

Install Calico

helm repo add projectcalico https://docs.tigera.io/calico/charts
helm install calico projectcalico/tigera-operator \
  --namespace kube-system

Basic Network Policy

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: api-allow-web
spec:
  podSelector:
    matchLabels:
      app: api
  policyTypes:
  - Ingress
  ingress:
  - from:
    - podSelector:
        matchLabels:
          app: web
    ports:
    - protocol: TCP
      port: 8080

Default Deny All

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

Allow DNS Egress

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-dns
spec:
  podSelector: {}
  policyTypes:
  - Egress
  egress:
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: kube-system
    ports:
    - protocol: UDP
      port: 53

References

• Network Policies
• EKS Workshop - Network Policies