Spawned user process not visible from other machine

JupyterHub discuss
4

A message A Jupyter Server is running typically means that the spawner started just a jupyter_server. To give a bit of background, jupyter_server is the backend server that is used for jupyterlab and notebook interfaces. So, what I assume is that your single user environments do not have jupyterlab/notebook or your single user environments are not properly configured and hence, JupyterHub is starting just the backend jupyter_server. That is why you do not see anything except the message A Jupyter Server is running.

So check if your single user environment is properly configured.

Instead of using pre_spawn_hook use Spawner.environment to setup the user env variables. I dont think env variables setup in pre_spawn_hook will be propagated to single user servers. You can use a custom spawner based on SimpleLocalProcessSpawner in config

from jupyterhub.spawner import SimpleLocalProcessSpawner
import os

class MyCustomSpawner(SimpleLocalProcessSpawner):

     def get_env(self):
           super().get_env()
           users_base_path = '/home/jupyteruser/jupyter/users'
           username = self.user.name
           env['PATH'] = f'{users_base_path}/{username}/bin:{os.environ["PATH"]}'
           env['LD_LIBRARY_PATH'] = f'/home/jupyteruser/jupyter/instantclient_19_5'
     return env
c.JupyterHub.spawner_class = 'MyCustomSpawner'

Try this approach and let us know.

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