heketi-cli: 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
/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/heketi-cli - from package: heketi

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