Netpol

---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: maintenane-deny-all
  namespace: foo
spec:
  podSelector:
    matchLabels:
      app: maintenance
  policyTypes:
  - Ingress
  - Egress

---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: users-backend-network-policy
  namespace: users-backend
spec:
  podSelector: {}
  policyTypes:
  - Ingress
  - Egress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: users-backend
    ports:
    - protocol: TCP
      port: 80
  egress:
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: users-backend
    ports:
    - protocol: TCP
      port: 80