fenced: 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:

/usr/sbin/fenced - from package: cman

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

On Debian possible default full paths are:

/usr/sbin/fenced - from package: cman

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

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