cgrulesengd: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/sbin/cgrulesengd - from package: libcgroup

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/cgrulesengd - from package: cgroup-tools

You may install the required package with command apt-get install {package}

Error in other languages:
cgrulesengd: bevel nie gevind nie
cgrulesengd: comandă negăsită
cgrulesengd: comando não encontrado
cgrulesengd: commande introuvable
cgrulesengd: command not found
cgrulesengd: käsku ei ole
cgrulesengd: không tìm thấy lệnh
cgrulesengd: komanda nerasta
cgrulesengd: Kommando nicht gefunden.
cgrulesengd: kommandot finns inte
cgrulesengd: komut yok
cgrulesengd: nie znaleziono polecenia
cgrulesengd: níor aimsíodh an t-ordú
cgrulesengd: no se encontró la orden
cgrulesengd: no s'ha trobat l'ordre
cgrulesengd: opdracht niet gevonden
cgrulesengd: parancs nem található
cgrulesengd: perintah tidak ditemukan
cgrulesengd: príkaz nenájdený
cgrulesengd: příkaz nenalezen
cgrulesengd: команда не найдена
cgrulesengd: командата не е открита
cgrulesengd: 命令找不到
cgrulesengd: コマンドが見つかりません