1 创建rhel-debuginfo.repo，如果有则先备份再删除
   
   cd  /etc/yum.repos.d
   rm  rhel-debuginfo.repo
   vi  rhel-debuginfo.repo 
  插入以下内容
  [Server] 
 name=Red Hat Enterprise Linux Server 
 baseurl=file:///mnt  #本地iso的挂载路径
 enabled=1            #可以使用yum
 gpgcheck=0      #设置不检查gpgkey 
 gpgkey=file:///mnt/RPM-GPG-KEY-redhat-release  # 配置gpgkey的路径
   
2 修改yumRepo.py配置文件
  
   cd /usr/lib/python2.6/site-packages/yum/
   vi yumRepo.py
   
  找到  remote = url + ‘/’ + relative  #802行
  改为  remote = "/mnt" + '/' + relative

3 挂载iso文件

  mount /dev/cdrom /mnt

4 测试 安装ftp 默认没有安装
   yum list | grep vsftpd

  vsftpd.i686                            2.2.2-11.el6                       @Server

  安装：yum install  vsftpd.i686

[root@redhat6 yum]# rpm -e vsftpd.i686
[root@redhat6 yum]# yum install vsftpd.i686
Loaded plugins: fastestmirror, product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Loading mirror speeds from cached hostfile
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package vsftpd.i686 0:2.2.2-11.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================================================
 Package                       Arch                        Version                                Repository                     Size
======================================================================================================================================
Installing:
 vsftpd                        i686                        2.2.2-11.el6                           Server                        157 k

Transaction Summary
======================================================================================================================================
Install       1 Package(s)

Total download size: 157 k
Installed size: 344 k
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
** Found 3 pre-existing rpmdb problem(s), 'yum check' output follows:
PackageKit-0.5.8-21.el6.i686 has missing requires of PackageKit-yum = ('0', '0.5.8', '21.el6')
PackageKit-0.5.8-21.el6.i686 has missing requires of PackageKit-yum-plugin = ('0', '0.5.8', '21.el6')
rhn-check-1.0.0.1-4.el6.noarch has missing requires of yum-rhn-plugin >= ('0', '0.9.1', '35')
  Installing : vsftpd-2.2.2-11.el6.i686                                                                                           1/1
  Verifying  : vsftpd-2.2.2-11.el6.i686                                                                                           1/1

Installed:
  vsftpd.i686 0:2.2.2-11.el6

Complete!

验证成功