참조 사이트 https://kubernetes.io/docs/concepts/services-networking/network-policies/ Network PoliciesIf you want to control traffic flow at the IP address or port level (OSI layer 3 or 4), NetworkPolicies allow you to specify rules for traffic flow within your cluster, and also between Pods and the outside world. Your cluster must use a network plugin thakubernetes.io 0. 전제조건Network Policies는 htt..