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documentation update on postStart hook use #3573

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documentation update on postStart hook use #3573

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6 changes: 6 additions & 0 deletions docs/source/jupyterhub/customizing/user-environment.md
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Expand Up @@ -331,6 +331,12 @@ container, meaning that commands that place files relative to `./` will result
in users seeing those files in their home directory. You can use commands like
`wget` to place files where you like.

It's also worth mentioning that Kubernetes PostStart hook is
[executed asynchronously](https://kubernetes.io/docs/concepts/containers/container-lifecycle-hooks/#hook-handler-execution).
This means there is no guarantee that the hook will execute before the container
ENTRYPOINT. This makes postStart hook unusable if some initialization must complete
before the user server start. For these cases a [custom command](#set-cmd) may be used.

A simple way to populate the notebook user's home directory is to add the
required files to the container's `/tmp` directory and then copy them to
`/home/jovyan` using a `postStart` hook. This example shows the use of
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