一般来说centos主要用于服务器端，所以很少开启图形化界面，但是有时候为了工作方便也会偶尔开启图形界面，下面就让简单谈谈如何开启图形化界面。
推荐：《centos使用教程》
使用 yum groupinstall 指令很容易就能安装上图形界面的桌面系统。
1. yum 的 group 指令
yum 可以以程序组的模式来安装成套的软件包。支持的软件包可以通过，
# yum grouplist
查询到。在 group 软件包中，Desktop、Desktop Platform、KDE Desktop、X Window System 是主要的桌面环境。
2. 图形桌面环境
要安装 KDE 桌面环境，执行指令，
# yum groupinstall "X Window System" "KDE Desktop" Desktop
即可，同时安装了 3 个软件包。注意，因为 KDE Desktop 和 X Window System 两个软件包名称中间都包含空格，需要用引号引起来才行。
要安装 Gnome 桌面环境，执行指令，
# yum groupinstall "X Window System" "Desktop Platform" Desktop
即可，也是同时安装了 3 个软件包，其中 X Window System 是必须的，不管是 Gnome 还是 KDE。
3. 启用
从命令行直接启动图形桌面环境，
# startx
这样就会启动默认的 Gnome 或者 KDE 桌面环境。
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