fence_alom: command not found

Have You tried accessing the binary with the full path?

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 Debian possible default full paths are:

/usr/sbin/fence_alom - from package: fence-agents

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