kubernetes-guide/docs/chap11/11.2.md

mysql-redis-nw.yaml

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: mysql-np
  namespace: nw-demo
spec:
  podSelector:
    matchLabels:
      app: mysql
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          access-nw-mysql-redis: "true"
    ports:
    - protocol: TCP
      port: 3306
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: redis-np
  namespace: nw-demo
spec:
  podSelector:
    matchLabels:
      app: redis 
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          access-nw-mysql-redis: "true"
    ports:
    - protocol: TCP
      port: 6379

​ nginx-nw.yaml

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: nginx-np
  namespace: nw-demo
spec:
  podSelector:
    matchLabels:
      app: nginx
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          app.kubernetes.io/name: ingress-nginx
      podSelector:
        matchLabels:
          "app.kubernetes.io/name": ingress-nginx
    - podSelector: {}
    ports:
    - protocol: TCP
      port: 80