ipvsadm-restore: 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:

/sbin/ipvsadm-restore - from package: ipvsadm

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

On Debian possible default full paths are:

/sbin/ipvsadm-restore - from package: ipvsadm

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

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