fence_node: 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/fence_node - from package: cman

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

On Debian possible default full paths are:

/usr/sbin/fence_node - from package: cman

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

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