I am trying to Connect simple nginx pod to Nodeport service. but i am getting a error i.e, Connectio-CodePudding

root@Master:~# cat new-pod.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: zero-pod
  labels:
    app: my-ns
spec:
  containers:
  - image: nginx
    name: zero-pod

root@Master:~# cat nps.yaml 
apiVersion: v1
kind: Service
metadata:
  name: my-ns
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 8080
  selector:
    app: my-ns
  type: NodePort

root@Master:~# kubectl get svc my-ns
NAME    TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
my-ns   NodePort   10.105.183.144   <none>        80:30007/TCP   48m

root@Master:~# curl 10.2.0.4:30007
curl: (7) Failed to connect to 10.2.0.4 port 30007: Connection refused

I have created another simple helloworld pod connected to same nodeport service, its working.

root@Master:~# curl 10.2.0.4:30007
Hello, world!
Version: 2.0.0
Hostname: pod-theta

What is the basic thing, that i am missing in this or we cannot connect nginx server to nodeport at all.

If not, i see nginx is being connected to nodeport through deployment, how is that working, can someone please throw some light on this??

CodePudding user response：

The nginx service in the official nginx container listens on port 80, not on port 8080. You need to update the targetPort setting in your Service:

apiVersion: v1
kind: Service
metadata:
  name: my-ns
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: my-ns
  type: NodePort

While not absolutely necessary, I would define the port in your Pod manifest, possibly with a name, so that you end up with this Pod manifest:

apiVersion: v1
kind: Pod
metadata:
  name: zero-pod
  labels:
    app: my-ns
spec:
  containers:
  - image: nginx
    name: zero-pod
    ports:
      - containerPort: 80
        name: http

And this Service:

apiVersion: v1
kind: Service
metadata:
  name: my-ns
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: http
  selector:
    app: my-ns
  type: NodePort