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apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: web-app
spec:
  podSelector:
    matchLabels:
      app: web-app
  policyTypes:
    - Egress
    - Ingress
  ingress:
    - ports:
        - port: 3000
  egress:
    - to:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: kube-system
      ports:
        - protocol: UDP
          port: 53
    - to:
        - podSelector:
            matchLabels:
              app: mysql-db
      ports:
        - protocol: TCP
          port: 3306
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: mysql
spec:
  podSelector:
    matchLabels:
      app: mysql-db
  policyTypes:
    - Ingress
  ingress:
    - from:
        - podSelector:
            matchLabels:
              app: web-app
      ports:
        - protocol: TCP
          port: 3306