rbd-fuse: 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/rbd-fuse - from package: rbd-fuse

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

On Debian possible default full paths are:

/usr/bin/rbd-fuse - from package: rbd-fuse

You may install the required package with command apt-get install {package}

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