Kubernetes service NodePort

NodePort

모든 노드를 대상으로 외부에서 접속이 가능한 포트를 예약하는 기능을 제공

• 기본 포트 : 30000 ~ 32767을 사용하고 있으며, ClusterIP(必)가 설정된 이후 예약됨
• ClusterIP 주소를 이용하지 않고 노드 IP 주소:노드 포트 번호 형식으로 접근 가능

[root@master ~/kube/08/nodeport]# vi nginx-nodeport.yaml
[root@master ~/kube/08/nodeport]# cat nginx-nodeport.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-nodeport
spec:
type: NodePort
clusterIP: 10.233.10.10
selector:
	app: webui
ports:
- protocol: TCP
	port: 80
	targetPort: 80
	nodePort: 30200
[root@master ~/kube/08/nodeport]# kubectl apply -f nginx-nodeport.yaml
service/nginx-nodeport created
[root@master ~/kube/08/nodeport]# kubectl get pod,svc,ep -o wide
NAME                               READY   STATUS    RESTARTS   AGE    IP               NODE    NOMINATED NODE   READINESS GATES
pod/nginx-deploy-9cc457697-8bjql   1/1     Running   0          2m6s   10.233.102.172   node1   <none>           <none>
pod/nginx-deploy-9cc457697-gq5fd   1/1     Running   0          2m6s   10.233.75.61     node2   <none>           <none>
pod/nginx-deploy-9cc457697-lrks7   1/1     Running   0          2m6s   10.233.71.38     node3   <none>           <none>

NAME                     TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE     SELECTOR
service/kubernetes       ClusterIP   10.233.0.1     <none>        443/TCP        5h19m   <none>
service/nginx-nodeport   NodePort    10.233.10.10   <none>        80:30200/TCP   2m29s   app=webui

NAME                       ENDPOINTS                                           AGE
endpoints/kubernetes       192.168.2.60:6443                                   5h19m
endpoints/nginx-nodeport   10.233.102.172:80,10.233.71.38:80,10.233.75.61:80   2m29s
[root@master ~/kube/08/nodeport]# kubectl describe svc nginx-nodeport
Name:                     nginx-nodeport
Namespace:                default
Labels:                   <none>
Annotations:              <none>
Selector:                 app=webui
Type:                     NodePort
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       10.233.10.10
IPs:                      10.233.10.10
Port:                     <unset>  80/TCP
TargetPort:               80/TCP
NodePort:                 <unset>  30200/TCP
Endpoints:                10.233.102.172:80,10.233.71.38:80,10.233.75.61:80
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

NodePort 테스트

[root@master ~/kube/08/nodeport]# curl <http://192.168.2.60:30200>
<h1>#2# TEST Page</h1>
[root@master ~/kube/08/nodeport]# curl <http://192.168.2.60:30200>
<h1>#1# TEST Page</h1>
[root@master ~/kube/08/nodeport]# curl <http://192.168.2.61:30200>
<h1>#2# TEST Page</h1>
[root@master ~/kube/08/nodeport]# curl <http://192.168.2.62:30200>
<h1>#2# TEST Page</h1>
[root@master ~/kube/08/nodeport]# curl <http://192.168.2.63:30200>
<h1>#2# TEST Page</h1>