Jupyterhub & nbgrader with dockerspawner and kubespawner

[bpfrd]

Hi,

I got confused about a spawner and a service. Does spawner run jupyterhub-singleuser with some options for each user? what does a service do then? in the demo provided https://github.com/jupyter/nbgrader/tree/main/demos/demo_multiple_classes the service does the same thing.
in the case of using dockerspawner/kubespanwer, is jupyterhub-singleuser called? how?
could anyone give me some hint how I can generalize the demo provided for multiple_classes to docker & kubespawners?

Thanks.

[lahwaacz]

JupyterHub service is a very general concept independent of spawners. The nbgrader service runs jupyterhub-singleuser for the predefined grader user, but without the spawner - that runs the notebook server for a user when they log in to JupyterHub.