centos7.2 安装图像界面

yum install gnome-classic-session gnome-terminal nautilus-open-terminal control-center liberation-mono-fonts  -y

yum groupinstall 'X Window System'  -y

图像界面要执行这条命令  systemctl set-default graphical.target

查看当前是在哪个模式下  

systemctl get-default