Sometimes, you need to fix something in your z2jh that you can’t do with any of the configuration options or even by setting traitlets directly.
As an example, I was running into a bug that made kubespawner just not work for users with usernames starting with -. Now, this needs to be fixed properly in kubespawner, but the student encountering this issue had a deadline! How to fix this?
From the error message, I know that the issue was us setting a label with the username on the pod, and that not being escaped properly. Looking through the code, I also discovered the exact line causing the issue. Since I don’t use the labels for anything useful, I just needed to get rid of it.
You can specify python you want to run as part of config via hub.extraConfig, and this can be used to actually make a new spawner class! So you inherit from KubeSpawner, override what you want, and tada!
In our case, the config ended up something like this:
hub:
extraConfig:
01-no-labels: |
from kubespawner import KubeSpawner
class CustomSpawner(KubeSpawner):
def _build_common_labels(self, extra_labels):
labels = super()._build_common_labels(extra_labels)
# Until https://github.com/jupyterhub/kubespawner/issues/498
# is fixed
del labels['hub.jupyter.org/username']
return labels
This removes the username label, and solves my problem! I link it to the kubespawner issue, so I can remove this customization when the issue is fixed.
Hope this helps folks!
