Kubespawner custom prespawn image

JupyterHub Zero to JupyterHub on Kubernetes
1

I have a pre_spawn_hook that requires the use of s3fs, but I can’t figure out how to modify the underlying image to install s3fs. I tried changing c.KubeSpawner.image to point to a custom singleuser image which installs s3fs, but this didn’t work.

2

If you can show us your full configuration and link to any Dockerfiles you’re using that might help us understand what the problem is.

3

Here is a minimal configuration override for the jupyterhub helm chart that would replicate the issue that I’m facing:


jupyterhub:
    hub:
       extraConfig:
            myConfig: |
                c.KubeSpawner.image = "<CUSTOM IMAGE BASED ON jupyter/singleuser - but with s3fs installed>"
                async def pre_spawn_hook(spawner):
                  import s3fs
                c.Spawner.pre_spawn_hook = pre_spawn_hook

Results in module not found error s3fs on spawn.

4

I think that maybe I need to modify hub.image instead of KubeSpawner image: https://github.com/jupyterhub/zero-to-jupyterhub-k8s/blob/f9ecaa8d117832387463c4096eac6fd2d03d8c3d/jupyterhub/values.yaml#L73 ?