I was able to follow all instructions mentioned here and create a cluster.

https://github.com/digitalocean/doks-example

I changed the image to my own, custom image.

# /usr/local/bin/kubectl --kubeconfig="k8s-1-14-2-do-0-blr1-1558848628228-kubeconfig.yaml" apply -f manifest1.yaml
service/doks-example1 created
deployment.extensions/doks-example1 created

The new app is deployed successfully...

# /usr/local/bin/kubectl --kubeconfig="k8s-1-14-2-do-0-blr1-1558848628228-kubeconfig.yaml" get service
NAME            TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)          AGE
doks-example    LoadBalancer   10.245.92.169   139.59.48.36    80:31378/TCP     14m
doks-example1   LoadBalancer   10.245.250.95   139.59.49.155   8887:32137/TCP   3m1s
kubernetes      ClusterIP      10.245.0.1      <none>          443/TCP          22m

But I am not able to create a new jupyter notebook after logging in. I get a "Forbidden" error.

How do I make the container writable?