apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: default-deny-all
  namespace: cks-net-hard
spec:
  podSelector: {}
  policyTypes:
    - Ingress
    - Egress
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-ledger-ingress-from-checkout
  namespace: cks-net-hard
spec:
  podSelector:
    matchLabels:
      app: ledger
  policyTypes:
    - Ingress
  ingress:
    - from:
        - podSelector:
            matchLabels:
              app: checkout
      ports:
        - protocol: TCP
          port: 8080
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-checkout-egress
  namespace: cks-net-hard
spec:
  podSelector:
    matchLabels:
      app: checkout
  policyTypes:
    - Egress
  egress:
    - to:
        - podSelector:
            matchLabels:
              app: ledger
      ports:
        - protocol: TCP
          port: 8080
    - to:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: kube-system
          podSelector:
            matchLabels:
              k8s-app: kube-dns
      ports:
        - protocol: UDP
          port: 53
        - protocol: TCP
          port: 53