Named server docs do not include information on name_template configuration

[stevejpurves]

Bug description

When using named servers in conjunction with DockerSpawner (in my case in a TLJH deployment) errors occur when trying to start a second named server.

This is solved by updating the DockerSpawner.name_template in line with the discussion in this forum post https://discourse.jupyter.org/t/multiple-jupyterhub-servers-per-user-named-servers-does-not-work/2357/5

However, it seems like the PR mentioned in the post was never merged?

Expected behaviour

The docs should mention setting the name_template option on the spawner..

Actual behaviour

there is no mention in the relevant section of the docs: https://github.com/jupyterhub/jupyterhub/blob/main/docs/source/reference/config-user-env.md#named-servers

How to reproduce

n/a

Your personal set up

• Jupyterhub 1.5 via TLJH
• FirstUserAuthenticator
• DockerSpawner
• tljh-repo2docker

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[minrk]

Not supporting named servers by default can be considered a bug in DockerSpawner. Migrating this issue over there, since it's not related to JupyterHub itself.