systemctl 命令是系统服务管理器指令，它实际上将 service 和 chkconfig 这两个命令组合到一起。

systemctl list-unit-files
systemctl list-units
systemctl list-unit-files | grep nfs

/lib/systemd/system/nfs-server.service
 /etc/systemd/system/

https://www.suse.com/support/kb/doc/?id=000019672