Jupyter 0.7.0 - errors adding single-letter users when I start up a clean install of jupyterhub

[Jonathan Morgan]

Hello,

I am having an odd problem with jupyterhub on two ubuntu machines where I just installed jupyterhub - one is Ubuntu 16.04, one is ubuntu 16.10.  Jupyterhub version is 0.7.0.  Python version is the default 3.5 for each of the OSes.

I get the following errors:

[E 2017-01-03 00:12:07.828 JupyterHub app:916] Error adding user 'o' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User o does not exist.'
   
[E 2017-01-03 00:12:07.829 JupyterHub app:916] Error adding user 'g' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User g does not exist.'
   
[E 2017-01-03 00:12:07.829 JupyterHub app:916] Error adding user 't' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User t does not exist.'
   
[E 2017-01-03 00:12:07.829 JupyterHub app:916] Error adding user 'n' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User n does not exist.'
   
[E 2017-01-03 00:12:07.829 JupyterHub app:916] Error adding user 'm' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User m does not exist.'
   
[E 2017-01-03 00:12:07.830 JupyterHub app:916] Error adding user 'j' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User j does not exist.'
   
[E 2017-01-03 00:12:07.830 JupyterHub app:916] Error adding user 'a' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User a does not exist.'
   
[E 2017-01-03 00:12:07.830 JupyterHub app:916] Error adding user 'h' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User h does not exist.'
   
[E 2017-01-03 00:12:07.830 JupyterHub app:916] Error adding user 'r' already in db
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line 911, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/usr/local/lib/python3.5/dist-packages/jupyterhub/auth.py", line 392, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User r does not exist.'
 
Does this sound familiar to anyone?  Any idea if there is something I might have configured wrong to make this happen?  If I can provide more information that might be useful, please let me know.

I tried deleting the jupyterhub.sqlite database file, and it has no effect.  I always get this same set of errors with the same set of users.  It is very strange.  I've been using jupyterhub for a few years now, have never seen anything like this.

Any help will be greatly appreciated.

Thanks,

Jonathan Morgan

[MinRK]

Indeed it does. Do you perhaps have a line in your jupyterhub_config.py that looks like:

c.Authenticator.whitelist = set('jonathanmorgan')

If so, you are missing some brackets, because that is the set {'j', 'o', 'n', ...}. You want:

c.Authenticator.whitelist = set(['jonathanmorgan'])
# or set literal:
c.Authenticator.whitelist = {'jonathanmorgan'}

JupyterHub 0.7.1 (currently in the process of releasing) adds a more informative warning if it thinks this has happened.

-Min

I tried deleting the jupyterhub.sqlite database file, and it has no effect.  I always get this same set of errors with the same set of users.  It is very strange.  I've been using jupyterhub for a few years now, have never seen anything like this.

Any help will be greatly appreciated.

Thanks,

Jonathan Morgan

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