I deployment a kubernetes cluster with 5 nodes: matser worker1 worker2 worker3 worker4.

And I create a deployment with 1 replica, it was arranged on worker4, expose port 7777

create a service:

apiVersion: v1
kind: Service
metadata:
  name: service-test
spec:
  type: NodePort
  selector:
    app: app
  ports:
    - name: http
      protocol: TCP
      port: 80
      targetPort: 7777
      nodePort: 31000

After create service, I send a request to worker4:31000/test ,it responses immediately.

But when I request other nodes on 31000, such as master:31100/test , worker1:31100/test. It has no response, and sometime it will response, but it cost such a long time.

when I use lsof to show port usage, it different

[root@worker4 ~]# lsof -i:31000
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
wrapper 5251 root    5u  IPv4  33957      0t0  TCP localhost:32000->localhost:31000 (ESTABLISHED)
java    5355 root   13u  IPv6  35851      0t0  TCP localhost:31000->localhost:32000 (ESTABLISHED)

COMMAND    PID USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
kube-prox 9679 root   13u  IPv6 3746350      0t0  TCP *:31000 (LISTEN)

so how can I visit nodePort service on other nodes.