euare-releaserole: 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

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/euare-releaserole - from package: euca2ools

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