Exposing the hello-minikube service fails to find a port

I could create the container:

$ kubectl run hello-minikube --image=gcr.io/google_containers/echoserver:1.4 --port=
deployment "hello-minikube" created

And I'm now trying to expose a service:

$ kubectl expose deployment hello-minikube --type=NodePort
error: couldn't find port via --port flag or introspection

Even if I delete it, it still comes back of its own:

$ kubectl delete pod hello-minikube-2138963058-2szl7
pod "hello-minikube-2138963058-2szl7" deleted
[stephane@stephane-ThinkPad-X201 ~]
$ kubectl get pods
NAME                              READY     STATUS    RESTARTS   AGE
hello-minikube-2138963058-nhh1q   1/1       Running   0          3m

The is the pod:

$ kubectl get pods
NAME                              READY     STATUS    RESTARTS   AGE
hello-minikube-2138963058-2szl7   1/1       Running   0          16m

And its description:

$ kubectl describe pod hello-minikube-2138963058-2szl7
Name:       hello-minikube-2138963058-2szl7
Namespace:  default
Node:       minikube/192.168.42.196
Start Time: Thu, 14 Sep 2017 23:20:03 +0200
Labels:     pod-template-hash=2138963058
        run=hello-minikube
Annotations:    kubernetes.io/created-by={"kind":"SerializedReference","apiVersion":"v1","reference":{"kind":"ReplicaSet","namespace":"default","name":"hello-minikube-2138963058","uid":"2b37ca13-9968-11e7-a720-525400...
Status:     Running
IP:     172.17.0.3
Created By: ReplicaSet/hello-minikube-2138963058
Controlled By:  ReplicaSet/hello-minikube-2138963058
Containers:
  hello-minikube:
    Container ID:   docker://5e4ba407d8869e6e843ec3d7876e953147cc01104e980c7febfea218808ab379
    Image:      gcr.io/google_containers/echoserver:1.4
    Image ID:       docker-pullable://gcr.io/google_containers/echoserver@sha256:5d99aa1120524c801bc8c1a7077e8f5ec122ba16b6dda1a5d3826057f67b9bcb
    Port:       <none>
    State:      Running
      Started:      Thu, 14 Sep 2017 23:20:05 +0200
    Ready:      True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-t8qx7 (ro)
Conditions:
  Type      Status
  Initialized   True 
  Ready     True 
  PodScheduled  True 
Volumes:
  default-token-t8qx7:
    Type:   Secret (a volume populated by a Secret)
    SecretName: default-token-t8qx7
    Optional:   false
QoS Class:  BestEffort
Node-Selectors: <none>
Tolerations:    <none>
Events:
  FirstSeen LastSeen    Count   From            SubObjectPath           Type        Reason          Message
  --------- --------    -----   ----            -------------           --------    ------          -------
  17m       17m     1   default-scheduler                   Normal      Scheduled       Successfully assigned hello-minikube-2138963058-2szl7 to minikube
  17m       17m     1   kubelet, minikube                   Normal      SuccessfulMountVolume   MountVolume.SetUp succeeded for volume "default-token-t8qx7" 
  17m       17m     1   kubelet, minikube   spec.containers{hello-minikube} Normal      Pulled          Container image "gcr.io/google_containers/echoserver:1.4" already present on machine
  17m       17m     1   kubelet, minikube   spec.containers{hello-minikube} Normal      Created         Created container
  17m       17m     1   kubelet, minikube   spec.containers{hello-minikube} Normal      Started         Started container

All of this on a host minikube on Linux.