gluster: 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/gluster - from package: glusterfs-cli

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

On Debian possible default full paths are:

/usr/sbin/gluster - from package: glusterfs-server

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

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