qdrouterd: 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/qdrouterd - from package: qpid-dispatch-router

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

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