cannaping: 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/cannaping - from package: Canna

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

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