[SOLVED] How to use NodePort with kind?

How to use NodePort with kind?

I'm trying to use NodePort with kind but somehow it doesn't want to work.

I've successfully deployed the following cluster:

apiVersion: kind.x-k8s.io/v1alpha4
kind: Cluster
nodes:
- role: control-plane
  extraPortMappings:
  - containerPort: 80
    hostPort: 30000
    listenAddress: "0.0.0.0" # Optional, defaults to "0.0.0.0"
    protocol: tcp # Optional, defaults to tcp
- role: worker

and then a very simple deployment:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hostname-deployment
  labels:
    app: hostname
spec:
  replicas: 2
  selector:
    matchLabels:
      app: hostname
  template:
    metadata:
      labels:
        app: hostname
    spec:
      containers:
      - name: hostname
        image: hostname:0.1
        ports:
        - containerPort: 80

and a service:

apiVersion: v1
kind: Service
metadata:
  name: hostname-service
spec:
  type: NodePort
  selector:
    app: hostname
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
      nodePort: 30000

and I can connect to the service via e.g.

(in one terminal)
k port-forward service/hostname-service 8080:80
Forwarding from 127.0.0.1:8080 -> 80

(another one)
curl localhost:8080
hostname: hostname-deployment-75c9fd6584-ddc59 at Wed, 17 Jun 2020 15:38:33 UTC

But I cannot connect to the service via the exposed NodePort

curl -v localhost:30000
* Rebuilt URL to: localhost:30000/
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 30000 (#0)
> GET / HTTP/1.1
> Host: localhost:30000
> User-Agent: curl/7.58.0
> Accept: */*
>
* Recv failure: Connection reset by peer
* stopped the pause stream!
* Closing connection 0
curl: (56) Recv failure: Connection reset by peer

kubectl get all output:

NAME                                       READY   STATUS    RESTARTS   AGE
pod/hostname-deployment-75c9fd6584-ddc59   1/1     Running   0          34m
pod/hostname-deployment-75c9fd6584-tg8db   1/1     Running   0          34m

NAME                       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
service/hostname-service   NodePort    10.107.104.231   <none>        80:30000/TCP   34m
service/kubernetes         ClusterIP   10.96.0.1        <none>        443/TCP        35m

NAME                                  READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/hostname-deployment   2/2     2            2           34m

NAME                                             DESIRED   CURRENT   READY   AGE
replicaset.apps/hostname-deployment-75c9fd6584   2         2         2       34m

Solution

Kind cluster configuration needs to be like below

apiVersion: kind.x-k8s.io/v1alpha4
kind: Cluster
nodes:
- role: control-plane
  extraPortMappings:
  - containerPort: 30000
    hostPort: 30000
    listenAddress: "0.0.0.0" # Optional, defaults to "0.0.0.0"
    protocol: tcp # Optional, defaults to tcp
- role: worker

This file is then passed to your creation command as kind create cluster --config=config.yaml (according to docs).