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93 lines
5.2 KiB
Markdown
93 lines
5.2 KiB
Markdown
## JupyterHub programming environment with student Notebooks
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#### Secondary schools may want to consider JupyterHub to integrate coding with dynamic interactive graphing — A New Way to Think About Programming — allowing students to integrate science experiment results and program output within their own blog-like "Jupyter Notebooks."
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* Jupyter Notebooks are widely used in the scientific community:
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* [Institutional FAQ](https://jupyterhub.readthedocs.io/en/stable/getting-started/institutional-faq.html)
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* [Getting Started](https://jupyterhub.readthedocs.io/en/stable/getting-started/)
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* [JupyterLab changelog](https://github.com/jupyterlab/jupyterlab/releases)
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* [JupyterHub changelog](https://jupyterhub.readthedocs.io/en/stable/changelog.html#changelog)
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* Students create their own accounts on first use — e.g. at http://box.lan/jupyterhub — just as if they're logging in regularly (unfortunately the login screen doesn't make that clear, but the teacher _does not_ need to be involved!)
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* A student can then sign in with their username and password, to gain access to their files (Jupyter Notebooks).
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* The teacher should set and protect JupyterHub's overall `Admin` password, just in case. As with student accounts, the login screen unfortunately doesn't make that clear — so just log in with username `Admin` — using any password that you want to become permanent.
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* Individual student folders are created in `/var/lib/private/` on the Internet-in-a-Box (IIAB) server:
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* A student will only be able to see their own work — they do not have privileges outside of their own folder.
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* Students may upload Jupyter Notebooks to the IIAB server, and download the current state of their work via a normal browser.
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* Linux administrators can read more about JupyterHub's [Local Users](https://github.com/jupyterhub/systemdspawner#local-users) and [c.SystemdSpawner.dynamic_users = True](https://github.com/jupyterhub/systemdspawner#dynamic_users)
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### Settings
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Linux administrators may want to review `/opt/iiab/jupyterhub/etc/jupyterhub/jupyterhub_config.py` which originates from:
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https://github.com/iiab/iiab/blob/master/roles/jupyterhub/templates/jupyterhub_config.py.j2
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In some rare circumstances, it may be necessary to restart JupyterHub's systemd service:
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```
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sudo systemctl restart jupyterhub
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```
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FYI `/opt/iiab/jupyterhub` is a Python 3 virtual environment, that can be activated (and deactivated) with the usual:
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```
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source /opt/iiab/jupyterhub/bin/activate
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(jupyterhub) root@box:~# deactivate
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```
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Passwords are hashed using 4096 rounds of the latest Blowfish (bcrypt's $2b$ algorithm) and stored in:
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```
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/opt/iiab/jupyterhub/etc/passwords.dbm # Or passwords.dbm.db in the past.
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```
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### Users can change their own password
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Users can change their password by logging in, and then visiting URL: http://box.lan/jupyterhub/auth/change-password
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NOTE: This is the only way to change the password for user `Admin`, because **File > Hub Control Panel > Admin** (below) does not permit deletion of this account.
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### File > Hub Control Panel > Admin, to manage accounts
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The `Admin` user (and any users given `Admin` privilege) can reset user passwords by deleting the user from JupyterHub's **Admin** page (below). This logs the user out, but does not remove any of their data or home directories. The user can then set a new password in the usual way — simply by logging in. Example:
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1. As a user with `Admin` privilege, click **File > Hub Control Panel** in your JupyterHub:
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2. At the top of the Control Panel, click **Admin**:
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This opens up the JupyterHub Admin page, where you can add / delete users, start / stop peoples’ servers and see who is online.
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3. Delete the user whose password needs resetting. Remember this does not delete their data or home directory:
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If there is a confirmation dialog, confirm the deletion. This will also log the user out, if they were currently running.
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4. Re-create the user whose password needs resetting, on this same screen.
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5. Ask the user to log in, but with a new password of their choosing. This will be their password going forward.
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_WARNING: If on login users see "500 : Internal Server Error", you may need to remove ALL files of the form_ `/run/jupyter-johndoe-singleuser`
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### Logging
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To see JupyterHub's (typically very long!) log, run:
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```
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journalctl -u jupyterhub
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```
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Sometimes other logs might also be available, e.g.:
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```
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journalctl -u jupyter-admin-singleuser
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```
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### PAWS/Jupyter Notebooks for Python Beginners
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While PAWS is a little bit off topic, if you have an interest in Wikipedia, please do see this 23m 42s video ["Intro to PAWS/Jupyter notebooks for Python beginners"](https://www.youtube.com/watch?v=AUZkioRI-aA&list=PLeoTcBlDanyNQXBqI1rVXUqUTSSiuSIXN&index=8) by Chico Venancio, from 2021-06-01.
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He explains PAWS as a "powerful Python execution environment https://paws.wmcloud.org = https://wikitech.wikimedia.org/wiki/PAWS [allowing] ordinary folks to write interactive scripts to work with Wikimedia content."
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