https://kubernetes.io/docs/concepts/services-networking/network-policies/
networkpolicy
kubectl get networkpolicy
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: internal-policy
spec:
podSelector:
matchLabels:
name: internal
policyTypes:
- Egress
egress:
- to:
- podSelector:
matchLabels:
name: mysql
ports:
- protocol: TCP
port: 3306
- to:
- podSelector:
matchLabels:
name: payroll
ports:
- protocol: TCP
port: 8080