[Unit] Description=Firewall Knock Operator Daemon After=network.target [Service] Type=forking PIDFile=/var/run/fwknopd.pid ExecStart=/usr/sbin/fwknopd ExecReload=/usr/sbin/fwknopd -R ExecStop=/usr/sbin/fwknopd -K [Install] WantedBy=multi-user.target