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jupyterhub/README.md: Clarifs & new screenshots

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@ -9,7 +9,7 @@
* [JupyterHub changelog](https://jupyterhub.readthedocs.io/en/stable/changelog.html#changelog)
* 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!)
* A student can then sign in with their username and password, to gain access to their files (Jupyter Notebooks).
* The teacher should set and protect JupyterHub's overall `Admin` password, just in case. As with student accounts, the login screen doesn't make that clear — so just log in with username `Admin` — using any password that you want to become permanent.
* 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.
* Individual student folders are created in `/var/lib/private/` on the Internet-in-a-Box (IIAB) server:
* A student will only be able to see their own work — they do not have privileges outside of their own folder.
* Students may upload Jupyter Notebooks to the IIAB server, and download the current state of their work via a normal browser.
@ -26,10 +26,11 @@ In some rare circumstances, it may be necessary to restart JupyterHub's systemd
sudo systemctl restart jupyterhub
```
FYI `/opt/iiab/jupyterhub` is a Python 3 virtual environment, that can be activated with the usual formula:
FYI `/opt/iiab/jupyterhub` is a Python 3 virtual environment, that can be activated (and deactivated) with the usual:
```
source /opt/iiab/jupyterhub/bin/activate
(jupyterhub) root@box:~# deactivate
```
Passwords are hashed using 4096 rounds of the latest Blowfish (bcrypt's $2b$ algorithm) and stored in:
@ -48,13 +49,13 @@ NOTE: This is the only way to change the password for user 'Admin', because Cont
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:
1. As a user with `Admin` privilege, click **Control Panel** in the top right of your JupyterHub:
1. As a user with `Admin` privilege, click **File > Hub Control Panel** in your JupyterHub:
![Control panel button in notebook, top right](control-panel-button1.png)
![image](https://user-images.githubusercontent.com/2458907/217602766-ab6a9d3c-9f92-496e-a0e8-6c18a084e960.png)
2. In the Control Panel, open the **Admin** link in the top left:
2. At the top of the Control Panel, click **Admin**:
![Admin button in control panel, top left](admin-access-button1.png)
![image](https://user-images.githubusercontent.com/2458907/217602473-f4f9fd40-b4c1-45e1-88c5-54c6d4b604ff.png)
This opens up the JupyterHub Admin page, where you can add / delete users, start / stop peoples’ servers and see who is online.