树莓派操作系统为
xxx@raspberrypi: $ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/
frp 版本为 frp_0.51.2_linux_arm64.tar.gz
按照官方的教程：https://gofrp.org/docs/setup/systemd/ 使用systemctl start frps可以成功启动frpc.
但是重启树莓派的时候 frpc 提示启动成功了但是进程里无显示。
xxx@raspberrypi:~ $ sudo systemctl status frpc
● frpc.service - frp client
Loaded: loaded (/etc/systemd/system/frpc.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Wed 2023-08-02 20:20:25 CST; 13h ago
Process: 520 ExecStart=/home/xxx/runFrp/frpc -c /home/xxx/runFrp/frpc.ini (code=exited, status=0/SUCCESS)
Main PID: 520 (code=exited, status=0/SUCCESS)
CPU: 102ms
Aug 02 20:20:24 raspberrypi systemd[1]: Started frp client.
Aug 02 20:20:25 raspberrypi systemd[1]: frpc.service: Succeeded.
查看frpc进程
xxx@raspberrypi: $ ps aux | grep frpc
xxx 4215 0.0 0.0 5912 672 pts/0 S+ 09:46 0:00 grep --color=auto frpc
搜索到了一篇文章https://blog.csdn.net/Ruanes/article/details/108186316
通过设置[Service]部分，当frp服务启动失败时，时隔5秒后重新启动它
添加一个参数 RestartSec=5 问题成功解决
完整systemd代码 xxx@raspberrypi: $ vi /etc/systemd/system/frpc.service
[Unit]
Description = frp client
After = network.target syslog.target
Wants = network.target
[Service]
Type=simple
ExecStart=/home/xxx/runFrp/frpc -c /home/xxx/runFrp/frpc.ini
Restart=always
RestartSec=5
[Install]
WantedBy=multi-user.target
修改完之后需要执行 sudo systemctl daemon-reload 使命令生效