apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-cas-postgres
spec:
  podSelector:
    matchLabels:
      app: cas
  policyTypes:
  - Ingress
  ingress:
  - from:
      - podSelector:
          matchLabels:
            app: postgres
    ports:
    - protocol: TCP
      port: 5432