nbgrader with TLJH

[vishwesh shrimali]

Hi everyone!

I recently launched a TLJH server (sincere thanks to the developers). I have managed to install kernels for multiple languages - C++ (Xeus-Cling), Python, R. I now want to use nbgrader to develop assignments in all the 3 languages. I logged in to the hub from the admin account, opened the terminal and used the following commands:

sudo jupyter nbextension install --sys-prefix --py nbgrader --overwrite
sudo jupyter nbextension enable --sys-prefix --py nbgrader
sudo jupyter serverextension enable --sys-prefix --py nbgrader

This in turn enabled the formgrader extension and the assignment extension. First, when I try to click the formgrader extension, I get the 404: Page Not Found error. 

I then used the following command to create a sample course:

nbgrader quickstart course_id

Still, the situation is the same. Second, when I login using a student account, I am able to see the formgrader and all the options (which I don't think a student should be allowed to see). Also, when the student clicks on the Assignment option, they get the following errors:

Traceback (most recent call last): File "/opt/tljh/user/lib/python3.6/site-packages/nbgrader/server_extensions/assignment_list/handlers.py", line 65, in list_released_assignments assignments = lister.start() File "/opt/tljh/user/lib/python3.6/site-packages/nbgrader/exchange/list.py", line 129, in start super(ExchangeList, self).start() File "/opt/tljh/user/lib/python3.6/site-packages/nbgrader/exchange/exchange.py", line 122, in start self.ensure_root() File "/opt/tljh/user/lib/python3.6/site-packages/nbgrader/exchange/exchange.py", line 100, in ensure_root self.fail("Unwritable directory, please contact your instructor: {}".format(self.root)) File "/opt/tljh/user/lib/python3.6/site-packages/nbgrader/exchange/exchange.py", line 78, in fail raise ExchangeError(msg) nbgrader.exchange.exchange.ExchangeError: Unwritable directory, please contact your instructor: /srv/nbgrader/exchange

Am I missing something? Can someone point me in the right direction?

Thanks in advance

[Jessica B. Hamrick]

Hi Vishwesh,

Setting up nbgrader on JupyterHub is a bit more complicated---see https://nbgrader.readthedocs.io/en/master/configuration/jupyterhub_config.html for more details on getting it setup on JupyterHub. Hope that helps!

Cheers,

Jess

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[Alvin Huff]

look at the nbgrader docs around "philosophy and the approach" that will show you the folder structure.  That structure is not created by default in jupyterhub when you install nbgrader.  I believe at the miniumum you need the source folder and a folder that is identified in the nbgrader_config.py file as the course id.  If you run "nbgrader quickstart <some course id >" that will generate the folder minimum folder structure as an example to follow.

cheers,

alvin