安裝Linux圖形化

centos7最小化安裝后再安裝GNOME圖形化界面
安裝桌面組件包
yum -y groupinstall “GNOME Desktop”
yum -y groupinstall “X Window System”
yum groupinstall "KDE Desktop" (centos6)

啟動桌面startx
startx
查看默認運行級別
systemctl get-default
設置默認運行級別
systemctl set-default graphical.target
rm ‘/etc/systemd/system/default.target’
ln -s ‘/usr/lib/systemd/system/graphical.target’ ‘/etc/systemd/system/default.target’
注：可通過 /etc/inittab 文件，查詢圖形化界面的運行級別
[root@local ~]# cat /etc/inittab

# inittab is no longer used when using systemd.
#
# ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# Ctrl-Alt-Delete is handled by /usr/lib/systemd/system/ctrl-alt-del.target
#
# systemd uses 'targets' instead of runlevels. By default, there are two main targets:
#
# multi-user.target: analogous to runlevel 3
# graphical.target: analogous to runlevel 5     (運行級別5)
#
# To view current default target, run:
# systemctl get-default
#
# To set a default target, run:
# systemctl set-default TARGET.target

(此外)
測試是否安裝成功
使用 init 5命令進入圖形化界面，如果成功的話，你將會進入圖形化界面的初始界面。
如何卸載圖形化界面
利用組卸載命令 yum groupremove +組包名即可，其中組包名就是我們之前上面安裝的那個就可以了。

參考文章：
http://www.linuxidc.com/Linux/2017-03/141348.htm
http://www.linuxidc.com/Linux/2015-12/126690.htm**