一.配置yum本地安装源：
su – root
mkdir /mnt/cdrom
mount -t iso9660 /dev/sr0 /mnt/cdrom
cd /etc/yum.repos.d
查看目录是否有.repo后缀文件，没有则创建一个.repo文件,文件名随意。
vi local.repo
[LOCAL]
name=local
baseurl=file:///mnt/cdrom
enable=1
gpgcheck=0
保存退出
yum clean all
二. 安装默认系统桌面(适于之前安装系统时未选中桌面安装)
1.安装桌面包
yum groupinstall “X Window System”
yum groupinstall “Desktop”
2.启动桌面
init 5
3.更改启动模式
vi /etc/inittab
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#
# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,
# with configuration in /etc/sysconfig/init.
#
# For information on how to write upstart event handlers, or how
# upstart works, see init(5), init(8), and initctl(8).
#
# Default runlevel. The runlevels used are:
# 0 – halt (Do NOT set initdefault to this)
# 1 – Single user mode
# 2 – Multiuser, without NFS (The same as 3, if you do not have networking)
# 3 – Full multiuser mode
# 4 – unused
# 5 – X11
# 6 – reboot (Do NOT set initdefault to this)
#
id:3:initdefault:
将上面红字部分的3改成53为命令行界面5为Xwindow图形界面
4.安装桌面右键终端：
yum install nautilus-open-terminal
