add systemd documentation

README.md

@@ -1285,6 +1285,9 @@ To enable an experimental feature, add the feature gate to your configuration:
 ```toml
 featureGates = { VirtualNet = true }
 ```
+### Enable as systemd service
+
+Read the [document](/doc/systemd_service.md).
 
 ### Feature Lifecycle
 

doc/systemd_service.md

@@ -0,0 +1,32 @@
+# Install systemd unit
+
+## install binary
+
+```sudo install ./frps /usr/local/bin```
+
+## Create systemd unit
+
+```sudo vi /lib/systemd/syste.frps.service```
+
+
+
+```[Unit]
+Description=FRP Server Service
+After=network.target 
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/frps -c /usr/local/etc/frp/frps.toml
+Restart=on-failure
+RestartSec=15s
+
+[Install]
+WantedBy=multi-user.target
+
+## Enable service
+
+```sudo systemctl daemon-reload
+sudo systemctl enable frps.service
+sudo systemctl start frps.service
+sudo systemctl status frps.service```
+