Jupyterhub stuck on connecting to kernel

JupyterHub
,
1

Hello,

I’m transitionning from jupyter to jupyterhub and have some difficulty making the last steps working.
Currently, everything seems ok, I can login and spawn server, but when I try to use a notebook, it get stuck on “Connecting to Kernel”. I had no issue in Jupyter without the hub tough, and I can swap between the two easely.

In the logs, I noticed this :

[I 2022-08-23 17:47:31.151 SingleUserNotebookApp log:189] 200 GET /jupyter/user/jonathan/api/contents/Untitled.ipynb/checkpoints?_=1661269650881 (jonathan@10.50.2.115) 36.81ms
[I 2022-08-23 17:47:31.632 SingleUserNotebookApp handlers:190] Adapting to protocol v5.1 for kernel 672c1615-2066-4f68-a563-192b06d9fbd9
/usr/local/lib/python3.6/dist-packages/notebook/base/zmqhandlers.py:284: RuntimeWarning: coroutine ‘WebSocketHandler.get’ was never awaited
super(AuthenticatedZMQStreamHandler, self).get(*args, **kwargs)
[I 2022-08-23 17:47:31.639 SingleUserNotebookApp log:189] 200 GET /jupyter/user/jonathan/api/kernels/672c1615-2066-4f68-a563-192b06d9fbd9/channels?session_id=afb5fd06472142de8e9e3952720ce127 (jonathan@10.50.2.115) 428.65ms
[W 2022-08-23 17:47:32.836 SingleUserNotebookApp handlers:254] Replacing stale connection: 672c1615-2066-4f68-a563-192b06d9fbd9:afb5fd06472142de8e9e3952720ce127
[W 2022-08-23 17:48:35.004 SingleUserNotebookApp handlers:254] Replacing stale connection: 672c1615-2066-4f68-a563-192b06d9fbd9:afb5fd06472142de8e9e3952720ce127
[W 2022-08-23 17:49:40.119 SingleUserNotebookApp handlers:254] Replacing stale connection: 672c1615-2066-4f68-a563-192b06d9fbd9:afb5fd06472142de8e9e3952720ce127
[W 2022-08-23 17:50:49.090 SingleUserNotebookApp handlers:254] Replacing stale connection: 672c1615-2066-4f68-a563-192b06d9fbd9:afb5fd06472142de8e9e3952720ce127

And then it keeps looping.
I have also made this succesfully on a dev server and tried to match all the packages and such as close a possible, but to no avail.
Nothing funky here, I only installed jupyterhub via pip and went from there.

jupyter==1.0.0
jupyter-client==7.1.2
jupyter-console==6.0.0
jupyter-contrib-core==0.3.3
jupyter-contrib-nbextensions==0.5.1
jupyter-core==4.9.2
jupyter-highlight-selected-word==0.2.0
jupyter-latex-envs==1.4.6
jupyter-nbextensions-configurator==0.4.1
jupyter-telemetry==0.1.0
jupyterhub==1.0.0
jupyterthemes==0.20.0

2

Hi! There’s no “standard” way to install JupyterHub, so can you give us more details of how you’ve setup your system? The more information you can give the better, and it would also be useful to see your configuration file with secrets redacted, as well as the full list of packages.

Can you also try the latest version of JupyterHub (2.3.1)? 1.0.0 is very old.