* ./usr/lib/systemd/system * book-chat.service ``` [Unit] Description=chat After=network.target [Install] WantedBy=multi-user.target [Service] # User=root WorkingDirectory=/usr/local/book/chat ExecStart=/usr/local/bin/gitbook serve --port 50001 ExecReload=/bin/kill -HUP $MAINPID KillMode=process Restart=always RestartSec=30s ```