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1、本机源所在的目录: /etc/yum.repos.d/，下面是该目录下的文件，注意：在更换之前可以先备份自己的源,防止出错
[root@hadoop01 home]# ll /etc/yum.repos.d/
-rw-r--r--. 1 root root 1926 Nov 27 2013 CentOS-Base.repo
-rw-r--r--. 1 root root 638 Nov 27 2013 CentOS-Debuginfo.repo
-rw-r--r--. 1 root root 630 Nov 27 2013 CentOS-Media.repo
-rw-r--r--. 1 root root 3664 Nov 27 2013 CentOS-Vault.repo2、Centos 6.X 安装阿里或者网易的源
6.X的阿里源：wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
6.x的网易的源： wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
3、下载成功以后执行yum clean all 命令,然后执行yum makecache 命令
[root@hadoop01 yum.repos.d]# yum clean all
Loaded plugins: fastestmirror, refresh-packagekit, security
Cleaning repos: base extras updates
Cleaning up Everything
Cleaning up list of fastest mirrors
[root@hadoop01 yum.repos.d]# yum makecache
Loaded plugins: fastestmirror, refresh-packagekit, security
Determining fastest mirrors
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
base | 3.7 kB 00:00
base/group_gz | 242 kB 00:01
base/filelists_db | 6.4 MB 01:13
base/primary_db | 4.7 MB 00:24
base/other_db | 2.8 MB 00:15
extras | 3.4 kB 00:00
extras/filelists_db | 24 kB 00:00
extras/prestodelta | 1.1 kB 00:00
extras/primary_db | 25 kB 00:00
extras/other_db | 28 kB 00:00
updates | 3.4 kB 00:00
updates/filelists_db | 852 kB 00:02
updates/prestodelta | 36 kB 00:00
updates/primary_db | 1.2 MB 00:03
updates/other_db | 17 MB 01:19
Metadata Cache Created
[root@hadoop01 yum.repos.d]# 4、当yum makecache完成以后,源就安装完了
[root@hadoop01 yum.repos.d]# yum repolist
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
repo id repo name status
base CentOS-6 - Base - mirrors.aliyun.com 6,713
extras CentOS-6 - Extras - mirrors.aliyun.com 31
updates CentOS-6 - Updates - mirrors.aliyun.com 122
repolist: 6,866