CentOS6 yum安装图形界面
yum groupinstall -y "Desktop" "Desktop Platform" "Desktop Platform Development" "Fonts" "General Purpose Desktop" "Graphical Administration Tools" "Graphics Creation Tools" "Input Methods" "X Window System" "Chinese Support [zh]" "Internet Browser"
CentOS7 yum安装图形界面
yum groupinstall 'GNOME Desktop'
CentOS7很多命令都不一样了，变化大，
个人感觉目前CentOS7处于完善阶段，最新版本是7.1，建议大家在正式环境上还是用6吧，
等发行7.3之后再考虑应用在正式环境上，7.5应该很完善。