# adduser factorio
# systemctl enable factorio.service
# service factorio start

# /etc/systemd/system/factorio.service
[Unit]
Description=Factorio Server

[Service]
Type=simple
User=factorio
ExecStart=/factorio/bin/x64/factorio --start-server-load-latest --server-settings /factorio/data/server-settings.json
WorkingDirectory=/factorio
Restart=on-failure
KillSignal=SIGINT

[Install]
WantedBy=multi-user.target