access docker container in kubernetes

Question

I have a docker container with an application exposing port 8080. I can run it and access it on my local computer:

$ docker run -p 33333:8080 foo
* Running on http://127.0.0.1:8080/ (Press CTRL+C to quit)

I can test it with:

$ nc -v locahost 33333
connection succeeded!

However when I deploy it in Kubernetes it doesn't work. Here is the manifest file:

apiVersion: v1
kind: Pod
metadata:
  name: foo-pod
  namespace: foo
  labels:
    name: foo-pod
spec:
  containers:
  - name: foo
    image: bar/foo:latest
    ports:
    - containerPort: 8080

and

apiVersion: v1
kind: Service
metadata:
  name: foo-service
  namespace: foo
spec:
  type: NodePort
  ports:
    - port: 8080
    - NodePort: 33333
  selector:
    name: foo-pod

Deployed with:

$ kubectl apply -f foo.yaml 
$ nc -v <publicIP> 33333
Connection refused

I don't understand why I cannot access it...

I noted that running a container only with nc will work:

cdupont
– cdupont

2016-10-12 12:38:19 +00:00
Commented Oct 12, 2016 at 12:38 — cdupont
– cdupont, Commented Oct 12, 2016 at 12:38

cdupont · Accepted Answer · 2016-10-12 13:35:54Z

1

The problem was that the application was listening on IP 127.0.0.1. It needs to listen on 0.0.0.0 to work in kubernetes. A change in the application code did the trick.

answered Oct 12, 2016 at 13:35

cdupont

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