一共两步:
1)安装webmin

(echo "[Webmin]
name=Webmin Distribution Neutral
baseurl=http://download.webmin.com/download/yum
enabled=1
gpgcheck=1
gpgkey=http://www.webmin.com/jcameron-key.asc" >/etc/yum.repos.d/webmin.repo; yum -y install webmin)

2)安装virtualmin

wget http://software.virtualmin.com/gpl/scripts/install.sh
sudo /bin/sh install.sh

之后用https://IP:10000登陆进去初始化配置即可