qpid-cluster: 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/qpid-cluster - from package: qpid-tools

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

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