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systemd-service.md

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Custom RCTV Systemd Service

Goals

  • On startup, launch /usr/bin/chromium-browser in --kiosk mode
  • Ensure that the Raspberry Pi never puts the display to sleep
  • Relaunch the service if it was aborted
  • Only launch the service once the GUI is ready

Installing

  1. Ensure that $DISPLAY is set even when connecting over SSH echo "export DISPLAY=:0.0 >> ~/.bashrc
  2. Create a new systemd service at /lib/systemd/system/rctv.service
  3. Copy the file below
  4. Reload the systemctl daemon using sudo systemctl daemon-reload
  5. Enable our rctv.service to be run on boot using sudo systemctl enable rctv.service
  6. Reboot the Raspberry Pi using sudo reboot
  7. Testing Locally Without Rebooting
  • sudo systemctl start rctv.service
  • sudo systemctl stop rctv.service
  • sudo systemctl restart rctv.service
  • journalctl -u rctv -b --no-pager to show the rctv.service logs since the last boot -b and now use a pager to view the output --no-pager

Debugging

  1. Use systemd-analyze verify rctv.service to see any issues with the service file
  2. To see logs from systemd immediately after boot, view the file sudo tail -f /var/log/boot.log and search for rctv.service
  3. If systemd-analyze shows a cyclic dependency (e.g. multi-user.target requires graphical.target which requires multi-user.target), this may be solved by removing symlinks to rctv.service in /etc/systemd/system/multi-user.target.wants or /etc/systemd/system/graphical.target.wants
  4. Lots of googling
# rctv.service

[Unit]
Description=RC TV Startup
Wants=graphical.target
After=graphical.target

[Service]
Type=simple
Environment=DISPLAY=:0.0
Environment=XAUTHORITY=/home/rctv/.Xauthority
ExecStartPre=/home/rctv/rctv-kiosk/kiosk.sh
ExecStart=/usr/bin/chromium-browser --no-sandbox --noerrdialogs --disable-infobars --kiosk https://rctv.recurse.com
Restart=on-abort
User=rctv
Group=rctv

[Install]
WantedBy=graphical.target