Selenium Standalone Server as a systemd Service

selenium.service

# /etc/systemd/system/selenium.service

[Unit]
Description=Selenium Standalone Server
Requires=xvfb.service
After=xvfb.service


[Service]
Type=simple
User=www-data
PIDFile=/opt/selenium/selenium.pid
Environment=DISPLAY=:99
# Restart=always
# RestartSec=10

ExecStart=/bin/java -jar \
  -Dwebdriver.chrome.bin=/bin/google-chrome \
  -Dwebdriver.chrome.driver=/opt/selenium/chromedriver \
  -Dwebdriver.chrome.logfile=/opt/selenium/log/chrome.log \
  /opt/selenium/selenium-server.jar \
  -log /opt/selenium/log/selenium.log \
  -role standalone \
  -port 4444

ExecStartPost=-/bin/bash -c '/bin/pgrep -u www-data -f selenium | /bin/head -n 1 > /opt/selenium/selenium.pid'

ExecStop=/bin/kill $(/bin/cat /opt/selenium/selenium.pid)

[Install]
WantedBy=multi-user.target
Alias=selenium-server

xvfb.service

# /etc/systemd/system/xvfb.service

[Unit]
Description=X virtual framebuffer

[Service]
Type=simple
User=root
ExecStart=/bin/Xvfb :99 -ac

[Install]
WantedBy=multi-user.target