This guide provides a very lightweight setup for a Raspberry Pi in kiosk mode: Instead of stripping down a full desktop environment like PIXEL or LXDE, we start without any GUI at all and install only the bare minimum needed to display a web browser in full screen.
Start With a Fresh Install of Raspian Lite
Download and install Raspbian Lite. In contrast to Raspian Desktop, Raspian Lite has no desktop environment preinstalled and is generally much lighter and smaller in size.
This guide is based on the November 2017 version of Raspian (Raspbian Stretch Lite), but it should work for other versions, too.
Boot up the Raspberry Pi, login as user
pi with password
raspberry, then start
sudo raspi-config to apply some initial customizations:
- Localisation Options: Select your preferred locale (we simply keep the default
en_GB.UTF-8), timezone, and keyboard layout.
- Change User Password: This is important – keeping the default password means your Pi will get owned faster than you can say “botnet” as soon as you connect it to the internet. (Make sure to have selected the correct keyboard layout before typing in the new password, though.)
- Network Options: Configure WiFi as needed. Alternatively, you also configure WiFi manually using
wpa_passphraseif you don’t want your WiFi password stored on the Pi in clear text.
- Boot Options: Select “Desktop / CLI” and then “Console Autologin”. We’ll come back to this later.
- Interfacing Options: Enable SSH access if needed.
- Advanced Options: Disable “Overscan” if the Pi’s output does not fill your screen completely.
Now reboot the Pi. If everything was done correctly you should end up in a terminal session without having to enter your password.
To conclude the initial setup, update all preinstalled packages:
sudo apt-get update sudo apt-get upgrade
Minimum Environment for GUI Applications
Usually the graphical environment for GNU/Linux consists of four parts:
- X server (usually X.Org)
- Window manager (Openbox, XFWM, …)
- Desktop environment (PIXEL, LXDE, MATE, …)
- Login manager (for example LightDM)
However, we only want to run a single application (the web browser) in full screen – so we don’t need a desktop environment. And we already have autologin enabled (and no other users will ever use the Pi) – so we don’t need a login manager either.
The bare minimum we need are X server and window manager. Let’s install just that:
sudo apt-get install --no-install-recommends xserver-xorg x11-xserver-utils xinit openbox
We’ll use Chromium because it provides a nice kiosk mode:
sudo apt-get install --no-install-recommends chromium-browser
Now with everything in place, we can configure Openbox. Edit
/etc/xdg/openbox/autostart and replace its content with the following:
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# Disable any form of screen saver / screen blanking / power management xset s off xset s noblank xset -dpms # Allow quitting the X server with CTRL-ATL-Backspace setxkbmap -option terminate:ctrl_alt_bksp # Start Chromium in kiosk mode sed -i 's/"exited_cleanly":false/"exited_cleanly":true/' ~/.config/chromium/'Local State' sed -i 's/"exited_cleanly":false/"exited_cleanly":true/; s/"exit_type":"[^"]\+"/"exit_type":"Normal"/' ~/.config/chromium/Default/Preferences chromium-browser --disable-infobars --kiosk 'http://your-url-here'
First we disable screen blanking and power management (we don’t want our screen to go blank or even turn off completely after some time).
Then we allow to quit the X server by pressing Ctrl-Alt-Backspace. (Because we didn’t install a desktop environment there won’t be a “Log out” button or the like.)
Finally we tell Openbox to start Chromium in kiosk mode. This turns out to be a bit intricate because Chromium loves to show various tool bubbles for session restore etc. The simplest way to avoid all of these seems to be tricking Chromium into thinking it exited cleanly last time it was run (see this answer on Super User for details).
That’s it! Time to give it a try:
startx -- -nocursor
After a few seconds Chromium should appear showing the URL you specified. Oh, and as you might have guessed: The
-nocursor option tells X to not display any mouse cursor at all.
Press Ctrl-Alt-Backspace to quite the X server, bringing you back into the text console.
Start X automatically on boot
Now there’s only one thing left: The X server should start automatically on boot.
Because we already configured the Pi to autologin the
pi user, we can use its
.bash_profile for starting X. Simply append the following line:
[[ -z $DISPLAY && $XDG_VTNR -eq 1 ]] && startx -- -nocursor
The condition makes sure that X is only started on the first console (and if it isn’t already running). Because autologin uses the first console, this has the desired effect of automatically starting the X server (and thus the window manager and thus Chromium) on boot. And you can still use any of the other consoles for logging in manually.
Reboot your pi to test if everything works as expected.
- If Chromium (or the X server) crashes, press Ctrl-Alt-Backspace to kill the X server and restart it with
startx -- -nocursor.
- If you need a terminal session, you can switch to one of the other consoles by pressing Ctrl-Alt-F2 (or any other function key). Pressing Ctrl-Alt-F1 brings you back to the first console where Chromium is running.
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