文章轉載自：https://blog.csdn.net/inslow/article/details/54177191

有時候CentOS預設的yum源不一定是國內映象，導致yum線上安裝及更新速度不是很理想。這時候需要將yum源設定為國內映象站點。國內主要開源的開源映象站點應該是網易和阿里雲了。

修改CentOS預設yum源為mirrors.163.com

1、首先備份系統自帶yum源配置檔案/etc/yum.repos.d/CentOS-Base.repo

[root@localhost ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
 

2、進入yum源配置檔案所在的資料夾

[root@localhost ~]# cd /etc/yum.repos.d/

3、下載163的yum源配置檔案到上面那個資料夾內

CentOS7

[root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo

CentOS6

[root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

CentOS5

[root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS5-Base-163.repo
 

4、執行yum makecache生成快取

[root@localhost yum.repos.d]# yum makecache

5、這時候再更新系統就會看到以下mirrors.163.com資訊

[root@localhost yum.repos.d]# yum -y update

已載入外掛：fastestmirror, refresh-packagekit, security

設定更新程序Loading mirror speeds from cached hostfile

* base: mirrors.163.com

* extras: mirrors.163.com

* updates: mirrors.163.com
 

修改CentOS預設yum源為mirrors.aliyun.com
1、首先備份系統自帶yum源配置檔案/etc/yum.repos.d/CentOS-Base.repo

[root@localhost ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2、下載ailiyun的yum源配置檔案到/etc/yum.repos.d/
CentOS7

[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

CentOS6

[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

CentOS5

[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

3、執行yum makecache生成快取

[root@localhost ~]# yum makecache

4、這時候再更新系統就會看到以下mirrors.aliyun.com資訊

[root@localhost ~]# yum -y update

已載入外掛：fastestmirror, refresh-packagekit, security

設定更新程序Loading mirror speeds from cached hostfile

* base: mirrors.aliyun.com

* extras: mirrors.aliyun.com

* updates: mirrors.aliyun.com