What component serves Jupyterlab / notebook to an authentificated user and where is that code?

JupyterHub
1

Hello,

I’m trying to understand the general architecture of JupyterHub and how it’s various components
interact. I’m having trouble understanding the exact responsibilities of JupyterHub single-user server.
The documentation singleuser.md states that :
" jupyterhub-singleuser , launches jupyter-server , the same program used when you run jupyter lab on your laptop"
Except that when running just jupyter-server on my laptop and going to the url provided in the console, there is no front-end, just a simple page that says a server is indeed running. We still need a jupyterlab / jupyter notebook front end, that JupyterHub does provide once a user connects. So necessarily, jupyterhub-singleuser must at some point run an instance of jupyterlab / jupyter notebook. I’m just having trouble understanding where this happens, in the source code of the hub it’s unclear exactly what’s really happening.

My question then is just : who is in charge of serving the frontend to an authentificated user
and where is that code ?

Many Thanks,

Gordon

2

Currently the default is to launch JupyterLab (which sits on top of Jupyter Server)

but it’s best to be explicit by setting the JUPYTERHUB_SINGLEUSER_APP environment variable.

JupyterHub is intentionally decoupled from the singleuser server, so for example you can implement your own from scratch, an example is

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3

Thank you for your reply, it’s clearer now !

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