jinja2.exceptions.TemplateNotFound

JupyterHub
1

I just finished setting up my jupyterhub image. I use the latest image from dockerhub, (docker pull jupyterhub/jupyterhub:latest)

When I attempt to access the site I receive the following error, mentioning a missing jinja template. I found a closed issue related to this on the GitHub site (Jupyterhub Docker not able to find any jinja templates · Issue #2852 · jupyterhub/jupyterhub · GitHub), but that stated the fix was added to the main branch back in 2020. I assume the latest tag (updated 2 months ago) has this fix. Any help is appreciated.

[I 2021-09-16 00:57:05.817 JupyterHub app:2849] JupyterHub is now running at http://0.0.0.0:8200
[I 2021-09-16 00:57:19.409 JupyterHub log:189] 302 GET / -> /hub/ (@192.168.1.4) 3.38ms
[I 2021-09-16 00:57:19.463 JupyterHub log:189] 302 GET /hub/ -> /hub/login?next=%2Fhub%2F (@192.168.1.4) 2.77ms
[E 2021-09-16 00:57:19.508 JupyterHub web:1789] Uncaught exception GET /hub/login?next=%2Fhub%2F (192.168.1.4)
    HTTPServerRequest(protocol='http', host='192.168.1.7:8200', method='GET', uri='/hub/login?next=%2Fhub%2F', version='HTTP/1.1', remote_ip='192.168.1.4')
    Traceback (most recent call last):
      File "/usr/local/lib/python3.8/dist-packages/tornado/web.py", line 1704, in _execute
        result = await result
      File "/usr/local/lib/python3.8/dist-packages/jupyterhub/handlers/login.py", line 142, in get
        self.finish(await self._render(username=username))
      File "/usr/local/lib/python3.8/dist-packages/jupyterhub/handlers/login.py", line 107, in _render
        return self.render_template(
      File "/usr/local/lib/python3.8/dist-packages/jupyterhub/handlers/base.py", line 1200, in render_template
        template = self.get_template(name, sync)
      File "/usr/local/lib/python3.8/dist-packages/jupyterhub/handlers/base.py", line 1188, in get_template
        return self.settings[key].get_template(name)
      File "/usr/local/lib/python3.8/dist-packages/jinja2/environment.py", line 997, in get_template
        return self._load_template(name, globals)
      File "/usr/local/lib/python3.8/dist-packages/jinja2/environment.py", line 958, in _load_template
        template = self.loader.load(self, name, self.make_globals(globals))
      File "/usr/local/lib/python3.8/dist-packages/jinja2/loaders.py", line 556, in load
        raise TemplateNotFound(name)
    jinja2.exceptions.TemplateNotFound: login.html
2

Hi! Please could you show us your configuration with secrets redacted, and show us the command(s) you used to run the JupyterHub container and any otherr images? Thanks!

3

Here is my config file. I removed all the comments, so everything not on here is the default value. My starting command is just jupyterhub

c.JupyterHub.bind_url = 'http://0.0.0.0:8200'
c.JupyterHub.data_files_path = '/jupyterhub-data'
c.JupyterHub.db_url = 'sqlite:////jupyterhub-db/jupyterhub.sqlite'
c.JupyterHub.hub_port = 8281
c.ConfigurableHTTPProxy.api_url = 'http://0.0.0.0:8201'
c.Spawner.default_url = '/lab'

import pwd, subprocess

def pre_spawn_hook(spawner):
    username = spawner.user.name
    try:
        pwd.getpwnam(username)
    except KeyError:
        subprocess.check_call(['useradd', '-ms', '/bin/bash', username])

c.Spawner.pre_spawn_hook = pre_spawn_hook

c.Authenticator.admin_users = set('root')
4

FYI. I ended up putting the following path

/usr/local/share/jupyterhub/templates/

Into the config file (c.JupyterHub.template_paths = ['/usr/local/share/jupyterhub/templates/']. That seemed to work. I am having some other issues with it not finding some of the css info, so the page looks weird, but it is at least loading now.

5

So I mistakenly thought this line would give me permanent storage outside of my docker container, since I bound this to a folder on my server. Apparently I am wrong and this was the cause to all my issues. I removed it and will continue to work through setting it up. Thank you for pointing me to my config file as the issue!

c.JupyterHub.data_files_path = '/jupyterhub-data'