euimage-install-pack: 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/bin/euimage-install-pack - from package: euca2ools

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

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