图形化，一般不再服务器中安装。为了提升系统的利用率。
centos的yum源对应centos的源
RHEL的yum源对应RHEL的源
我演示的Centos6.5，我挂载的RHEL6.5的源。作为软件源，仅作思路梳理！
01、挂载ISO配置本地yum源
ISO挂载
#mount /dev/sr0 /mnt \ 把光盘挂载到“/mnt”上面
#df \查看是否已经挂载
配置yum
vi /etc/yum.repo.cdrom.repo
[rhel]
name=rhel
baseurl=file:///mnt
gpgcheck=0
enabled=1
测试yum
yum makecache
yum repolist
02、安装图形化组件
此组件列表是RHEL6.5的ISO源--X Window System，Centos6.5图形化组件--Server with GUI
[root@jiao ~]# yum grouplist #查看群组件
Loaded plugins: fastestmirror
Setting up Group Process
Repository 'rhel' is missing name in configuration, using id
Loading mirror speeds from cached hostfile
rhel/group_gz | 204 kB 00:00 ...
Installed Groups:
Additional Development
E-mail server
General Purpose Desktop
Graphical Administration Tools
Legacy X Window System compatibility
Perl Support
Security Tools
Web Server
Available Groups:
Backup Client
Backup Server
Base
CIFS file server
Client management tools
Compatibility libraries
Console internet tools
Debugging Tools
Desktop
Desktop Debugging and Performance Tools
Desktop Platform
Desktop Platform Development
Development tools
Dial-up Networking Support
Directory Client
Directory Server
Eclipse
Emacs
FCoE Storage Client
FTP server
Fonts
Graphics Creation Tools
Hardware monitoring utilities
Identity Management Server
Infiniband Support
Input Methods
Internet Browser
Java Platform
KDE Desktop
Large Systems Performance
Legacy UNIX compatibility
Mainframe Access
Messaging Client Support
MySQL Database client
MySQL Database server
NFS file server
Network Infrastructure Server
Network Storage Server
Network file system client
Networking Tools
PHP Support
Performance Tools
PostgreSQL Database client
PostgreSQL Database server
Print Server
Printing client
Remote Desktop Clients
Ruby Support
SNMP Support
Scientific support
Server Platform
Server Platform Development
Smart card support
Storage Availability Tools
System Management
System administration tools
TeX support
Technical Writing
TurboGears application framework
Virtualization
Virtualization Client
Virtualization Platform
Virtualization Tools
Web Servlet Engine
Web-Based Enterprise Management
X Window System
iSCSI Storage Client
Available Language Groups:
Afrikaans Support [af]
Albanian Support [sq]
Amazigh Support [ber]
#yum -y groupinstall "Server with GUI" \ 安装图形化程序组
启动图形化startx
RHEL7命令
[root@localhost Desktop]# systemctl get-default \查看默认运行级别
multi-user.target
[root@localhost Desktop]# 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 /etc/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 \运行级别3：多用户界面
# graphical.target: analogous to runlevel 5 \运行级别5：图形化界面
# # To set a default target, run: # # ln -sf /lib/systemd/system/.target
/etc/systemd/system/default.target #
[root@localhost Desktop]#
systemctl set-default graphical.target \设置默认图形化运行级别
rm '/etc/systemd/system/default.target'
ln -s '/usr/lib/systemd/system/graphical.target' '/etc/systemd/system/default.target'
[root@localhost Desktop]# systemctl get-default \查看默认运行级别
graphical.target \图形化设置OK
[root@localhost Desktop]#
引荐：http://blog.csdn.net/yunwei888/article/details/52077201