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Kubernetes usage of "headless" VNC Docker images

The following content uses as example the image consol/rocky-xfce-vnc of the Dockerfile Dockerfile.rocky-xfce-vnc.

Deploy one pod of rocky-xfce-vnc image and expose a service

On an already logged in Kubernetes cluster just use the predefined deployment with service config kubernetes.headless-vnc.example.deployment.yaml:

kubectl apply -f  kubernetes/kubernetes.headless-vnc.example.deployment.yaml

Now a new pod with corresponding service should spin up with ContainerCreating:

kubectl get pods --output=wide

NAME                            READY     STATUS              RESTARTS   AGE       IP        NODE
headless-vnc-7f6bc46c84-hrhc2   0/1       ContainerCreating   0          28s       <none>    kubermatic-s9g9frstlk-n7tw6

After a while the kublet will have downloaded the imaged and started - shown as Running:

kubectl get pods --output=wide

NAME                            READY     STATUS    RESTARTS   AGE       IP           NODE
headless-vnc-7f6bc46c84-hrhc2   1/1       Running   0          3m        172.25.2.3   kubermatic-s9g9frstlk-n7tw6

ATTENTION: the above shown IP the cluster INTERNAL one!

Due to the following service configuration, the service will be exposed as type NodePort, this means that the service will accessible through the IP of the Kubernetes node and the exposed nodePort.

apiVersion: v1
kind: Service
metadata:
  labels:
    application: headless-vnc
  name: headless-vnc
spec:
  externalName: headless-vnc
  ports:
  - name: http-port-tcp
    protocol: TCP
    port: 6901
    targetPort: 6901
    nodePort: 32001
#...
  selector:
    application: headless-vnc
  type: NodePort

In this case you have to determine the EXTERNAL IP of the node kubermatic-s9g9frstlk-n7tw6. The you can connect to the pod via http://:32001/?password=vncpassword.

Delete deployment

Execute the command:

kubectl delete -f kubernetes/kubernetes.headless-vnc.example.deployment.yaml