netgo: 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/netgo - from package: netgo
/usr/sbin/netgo - from package: netgo

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