# Administrative Access

In The Littlest JupyterHub, we try to allow users to do as many administrative
tasks as possible within JupyterHub itself. Admin users can:

1. Have full root access with passwordless `sudo`
2. Install systemwide packages with `apt`
3. Install `conda` / `pip` packages for all JupyterHub
4. Change amount of RAM / CPU available to each user
and more!

By default, there are no admin users. You should add some after installation.

## Adding admin users

Admin users are specified in the [YAML](https://en.wikipedia.org/wiki/YAML)
config file at `/opt/tljh/config.yaml`.

1. Open the `config.yaml` file for editing.

   ```bash
   sudo nano /opt/tljh/config.yaml
   ```

2. Add usernames that should have admin access.

   ```yaml
   users:
     admin:
       - user1
       - user2
   ```

   Be careful around the syntax - indentation matters, and you should be using
   spaces and not tabs.

   When you are done, save the file and exit. In `nano`, you can do this with
   `Ctrl+X` key.

3. When you are sure the format is ok, restart JupyterHub to let the config take
   effect.

   ```bash
   sudo systemctl restart jupyterhub
   ```

This should give you admin access from JupyterHub! You can verify this by:

1. Opening a Terminal in your JupyterHub and checking if `sudo` works
2. Opening your JupyterHub `Control Panel` and checking for the **Admin** tab

From now on, you can use the JupyterHub to do most configuration changes.