如何使用 nodeport Kubernetes 连接到主节点

Question

I have two pods running on two different VM in the cluster one on the master node and other on the worker node. I have the following docker file exposed port 31700 on the server-side and IP address of server VM node is 192.168.56.105 and for client-side VM IP address is 192.168.56.106.

Dockerfile

EXPOSE 31700

Server file

 sock = socket()
 sock.bind(('0.0.0.0',31700))

Client file

 sock.connect(('192.168.56.105',31700))

Pod : kubectl get pods

 NAME      STATUS   ROLES    AGE   VERSION
 kmaster   Ready    master   25h   v1.19.3
 knode     Ready    worker   25h   v1.19.3

Service : kubectl get services

 NAME            TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
 kubernetes      ClusterIP   10.96.0.1        <none>        443/TCP        25h
 myapp-service   NodePort    10.108.144.147   <none>        80:31700/TCP   49m

Detail of the service is described below:

kubectl describe services myapp-service

Name:                     myapp-service
Namespace:                default
Labels:                   <none>
Annotations:              <none>
Selector:                 app=edge-server
Type:                     NodePort
IP:                       10.108.144.147
Port:                     <unset>  80/TCP
TargetPort:               80/TCP
NodePort:                 <unset>  31700/TCP
Endpoints:                192.168.189.5:80
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

When I try to ping through the below command I retrieve Connection refused on both the VMs

 curl -v https://192.168.56.105:31700    

I am able to ping the two pods. Please help me in this on connecting the server and client. Help is highly appreciated. Thank you for your wonderful support.

Answer 1

You need to use port-forwarding to access applications in your cluster
(see https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/ ).

You can forward a local port to a port on the Pod with:

kubectl port-forward service/kubernetes <local-port>:443

myapp-service is exposing (listening to) 31700, but you should use port 80.

Answer 2

在您的 Dockerfile 中，它应该是“EXPOSE 80”而不是“EXPOSE 31700”（假设您的容器侦听端口 80）