articles:
https://habrahabr.ru/company/otus/blog/340870/

service procps status
● systemd-sysctl.service - Apply Kernel Variables
     Loaded: loaded (/lib/systemd/system/systemd-sysctl.service; static)
     Active: active (exited)
       Docs: man:systemd-sysctl.service(8)
             man:sysctl.d(5)
    Process: 10142 ExecStart=/lib/systemd/systemd-sysctl (code=exited, status=0/SUCCESS)
   Main PID: 10142 (code=exited, status=0/SUCCESS)