updating content from zexuan's user test

docs/howto/admin/admin-users.rst

@@ -0,0 +1,101 @@
+.. _howto/admin/admin-users:
+
+========================
+Add / Remove admin users
+========================
+
+Admin users in TLJH have the following powers:
+
+#. Full root access to the server with passwordless ``sudo``.
+   This lets them do literally whatever they want in the server
+#. Access servers / home directories of all other users
+#. Install new packages for everyone with ``conda``, ``pip`` or ``apt``
+#. Change configuration of TLJH
+
+This is a lot of power, so make sure you know who you are giving it
+to. Admin users should have decent passwords / secure logni mechanisms,
+so attackers can not easily gain control of the system.
+
+.. important::
+
+   You should make sure an admin user is present when you **install** TLJH
+   the very first time. The ``:ref:`--admin <topic/customizing-installer/admin>```
+   flag passed to the installer does this. If you had forgotten to do so, the
+   easiest way to fix this is to run the installer again.
+
+Adding admin users from the JupyterHub interface
+================================================
+
+There are two primary user interfaces for doing work on your JupyterHub. By
+default, this is the Notebook Interface, and will be used in this section.
+If you are using JupyterLab, you can access the Notebook Interface by replacing
+``/lab`` with ``/tree`` in your URL.
+
+#. First, navigate to the Jupyter Notebook interface home page. You can do this
+   by going to the URL ``<my-hub-url>/user/<my-username>/tree``.
+
+#. Open the **Control Panel** by clicking the control panel button on the top
+   right of your JupyterHub.
+
+   .. image:: ../../images/control-panel-button.png
+      :alt: Control panel button in notebook, top right
+
+#. In the control panel, open the **Admin** link in the top left.
+
+   .. image:: ../../images/admin/admin-access-button.png
+      :alt: Admin button in control panel, top left
+
+   This opens up the JupyterHub admin page, where you can add / delete users,
+   start / stop peoples' servers and see who is online.
+
+#. Click the **Add Users** button.
+
+   .. image:: ../../images/admin/add-users-button.png
+      :alt: Add Users button in the admin page
+
+   A **Add Users** dialog box opens up.
+
+#. Type the names of users you want to add to this JupyterHub in the dialog box,
+   one per line. **Make sure to tick the Admin checkbox**.
+
+   .. image:: ../../images/admin/add-users-dialog.png
+      :alt: Adding users with add users dialog
+
+#. Click the **Add Users** button in the dialog box. Your users are now added
+   to the JupyterHub with administrator privileges!
+
+Adding admin users from the command line
+========================================
+
+Sometimes it is easier to add or remove admin users from the command line (for
+example, if you forgot to add an admin user when first setting up your JupyterHub).
+
+Adding new admin users
+----------------------
+
+New admin users can be added by executing the following commands on an
+admin terminal:
+
+.. code-block:: bash
+
+   sudo -E tljh-config add-item users.admin <username>
+   sudo -E tljh-config reload
+
+If the user is already using the JupyterHub, they might have to stop and
+start their server from the control panel to gain new powers.
+
+Removing admin users
+--------------------
+
+You can remove an existing admin user by executing the following commands in
+an admin terminal:
+
+.. code-block:: bash
+
+   sudo -E tljh-config remove-item users.admin <username>
+   sudo -E tljh-config reload
+
+If the user is already using the JupyterHub, they will continue to have
+some of their admin powers until their server is stopped. Another admin
+can force their server to stop by clicking 'Stop Server' in the admin
+panel.