[yz@localhost ~]$ sudo systemctl start cgred.service
[yz@localhost ~]$ sudo systemctl status cgred.service
● cgred.service - CGroups Rules Engine Daemon
   Loaded: loaded (/usr/lib/systemd/system/cgred.service; disabled; vendor preset: disabled)
   Active: active (running) since 2020-12-09 10:35:29 CST; 5s ago
  Process: 18178 ExecStart=/usr/sbin/cgrulesengd $OPTIONS (code=exited, status=0/SUCCESS)
 Main PID: 18181 (cgrulesengd)
    Tasks: 1
   CGroup: /system.slice/cgred.service
           └─18181 /usr/sbin/cgrulesengd -s -g cgred
……