[root@bogon zhi]# uname -a

Linux bogon 2.6.-642.11..el6.i686 # SMP Fri Nov  :: UTC  i686 i686 i386 GNU/Linux

[root@bogon zhi]# cat /etc/redhat-release

CentOS release 6.8 (Final)

[root@bogon zhi]# yum install wget
已加载插件：fastestmirror, refresh-packagekit
设置安装进程
Loading mirror speeds from cached hostfile
 * base: mirror.bit.edu.cn
 * epel: mirror.lzu.edu.cn
 * extras: mirrors.btte.net
 * updates: mirrors.btte.net
解决依赖关系
--> 执行事务检查
---> Package wget.i686 0:1.12-8.el6 will be 安装
--> 完成依赖关系计算

依赖关系解决

=================================================================================================================================================================================
 软件包                                   架构                                     版本                                           仓库                                      大小
=================================================================================================================================================================================
正在安装:
 wget                                     i686                                     1.12-8.el6                                     base                                     483 k

事务概要
=================================================================================================================================================================================
Install       1 Package(s)

总下载量：483 k
Installed size: 1.8 M
确定吗？[y/N]：y
下载软件包：
wget-1.12-8.el6.i686.rpm                                                                                                                                  | 483 kB     00:00     
运行 rpm_check_debug 
执行事务测试
事务测试成功
执行事务
  正在安装   : wget-1.12-8.el6.i686                                                                                                                                          1/1 
  Verifying  : wget-1.12-8.el6.i686                                                                                                                                          1/1 

已安装:
  wget.i686 0:1.12-8.el6                                                                                                                                                         

完毕！

[root@bogon zhi]# wget https://mirrors.tuna.tsinghua.edu.cn/epel/6/i386/epel-release-6-8.noarch.rpm

---- ::--  https://mirrors.tuna.tsinghua.edu.cn/epel/6/i386/epel-release-6-8.noarch.rpm

正在解析主机 mirrors.tuna.tsinghua.edu.cn... 166.111.206.63, :f000::::::

正在连接 mirrors.tuna.tsinghua.edu.cn|166.111.206.63|:... 已连接。

已发出 HTTP 请求，正在等待回应...  OK

长度： (14K) [application/x-redhat-package-manager]

正在保存至: “epel-release--.noarch.rpm.”

%[=======================================================================================================================================>] ,      --.-K/s   in 0s      

-- :: ( MB/s) - 已保存 “epel-release--.noarch.rpm.” [/])

[root@bogon zhi]# ls

Desktop  Documents  Downloads  epel-release--.noarch.rpm  epel-release--.noarch.rpm.  Music  Pictures  Public  Templates  Videos

[root@bogon zhi]# rpm -ivh epel-release--.noarch.rpm　　　　　　　　　　　　　　　　　　#安装下载好的epel rpm包

Preparing...                ########################################### [%]

        package epel-release--.noarch is already installed

[root@bogon zhi]# rpm -e epel-release--.noarch.rpm

error: package epel-release--.noarch.rpm is not installed

[root@bogon zhi]# rpm -e epel

error: package epel is not installed

[root@bogon zhi]# rpm -qa |grep  epel

epel-release--.noarch

[root@bogon zhi]# rpm -e epel-release--.noarch

[root@bogon zhi]# rpm -ivh epel-release--.noarch.rpm

Preparing...                ########################################### [%]

   :epel-release           ########################################### [%]

[root@bogon zhi]# rpm -qa |grep epel　　　　　　　　　　　　　　　　　　　　　　　　　　　　 #安装成功　　　　　　　

epel-release--.noarch

[root@bogon zhi]# ll  /etc/yum.repos.d/　　　　　　　　　　　　　　　　　　　　　　　　　　　#查看额外源　　　

总用量

-rw-r--r--.  root root  5月    CentOS-Base.repo

-rw-r--r--.  root root   5月    CentOS-Debuginfo.repo

-rw-r--r--.  root root   5月    CentOS-fasttrack.repo

-rw-r--r--.  root root   5月    CentOS-Media.repo

-rw-r--r--.  root root  5月    CentOS-Vault.repo

-rw-r--r--.  root root   11月    epel.repo

-rw-r--r--.  root root  11月    epel-testing.repo

[root@bogon zhi]# cat  /etc/yum.repos.d/epel.repo

[epel]

name=Extra Packages for Enterprise Linux  - $basearch

#baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch

failovermethod=priority

enabled=

gpgcheck=

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

[epel-debuginfo]

name=Extra Packages for Enterprise Linux  - $basearch - Debug

#baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch/debug

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-6&arch=$basearch

failovermethod=priority

enabled=

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

gpgcheck=

[epel-source]

name=Extra Packages for Enterprise Linux  - $basearch - Source

#baseurl=http://download.fedoraproject.org/pub/epel/6/SRPMS

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-6&arch=$basearch

failovermethod=priority

enabled=

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

gpgcheck=