c.KubeSpawner.default_url doesn’t work

[EtgarSH]

Bug description

When I change the c.KubeSpawner.default_url attribute in jupyterhub_config.py file to /lab, nothing changes.

Expected behaviour

The Jupyterlab homepage to be shown instead of Jupyter Notebook.

Actual behaviour

Jupyter Notebook is shown.

How to reproduce

1. Change the attribute to /lab.
2. Launch the server for the user.
3. /tree is still shown instead of /lab.

[manics]

Could you show us your full JupyterHub config with secrets redacted, versions of all components, and show us your Dockerfiles?

[consideRatio]

I bet this is a duplicate of #493 (comment) in practice.

2. I think the logic to silently ignore the traitlets args, notebook_dir, default_url when cmd is unset is problematic and should lead to a warning at least.

I assume cmd is no longer set to jupyterhub-singleuser.

[EtgarSH]

I bet this is a duplicate of #493 (comment) in practice.

2. I think the logic to silently ignore the traitlets args, notebook_dir, default_url when cmd is unset is problematic and should lead to a warning at least.

I assume cmd is no longer set to jupyterhub-singleuser.

Do you have any idea of a workaround solution to deal with this issue?

[manics]

This might have a proper fix in JupyterHub 2 which passes some spawner parameters as environment variables instead of command line arguments.

It's on my to-do list of things to check for the next major Z2JH release but I haven't had time 🙁.

Can you show us your full configuration?

[EtgarSH]

This might have a proper fix in JupyterHub 2 which passes some spawner parameters as environment variables instead of command line arguments.

It's on my to-do list of things to check for the next major Z2JH release but I haven't had time 🙁.

Can you show us your full configuration?

c.JupyterHub.authenticator_class = …
c.JupyterHub.spawner_class = ‘kubespawner.KubeSpawner’
c.KubeSpawner.image = “something that is based on the latest jupyterlab image”
c.KubeSpawner.debug = True

c.Spawner.notebook_dir = “…”
c.Spawner.default_url = ‘/lab’
c.KubeSpawner.default_url = ‘/lab’
c.KubeSpawner.working_dir = “…”

c.KubeSpawner.start_timeout = 1200
c.KubeSpawner.http_timeout = 120
`

[consideRatio]

Are you using kubespawner without the jupyterhub helm chart?

Well, configure c.Spawner.cmd to jupyterhub-singleuser and i think you will have default_url be passed.

[EtgarSH]

Are you using kubespawner without the jupyterhub helm chart?

Well, configure c.Spawner.cmd to jupyterhub-singleuser and i think you will have default_url be passed.

No I’m not using Helm, why is it recommended?

I tried it, but for some reason the pod of the user now crashes each time he logins.
It says “Crash Loop Back-off” and the logs don’t contain any errors but just end with a line saying that it exits the application - jupyter-notebook.

[manics]

I'll close this as there's since been a lot of developments including some major updates. If you're still having problems please could you open an issue on the community forum https://discourse.jupyter.org/ with a full reproducible example? Thanks!