修改CentOS默认yum源为国内yum镜像源
1、首先备份系统自带yum源配置文件/etc/yum.repos.d/CentOS-Base.repo
[[email protected] ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2、进入yum源配置文件所在的文件夹
[[email protected] ~]# cd /etc/yum.repos.d/

3、下载163的yum源配置文件到上面那个文件夹内
CentOS7
[[email protected] yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
 
CentOS6
[[email protected] yum.repos.d]# wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
 
CentOS5
[[email protected] yum.repos.d]# wget http://mirrors.163.com/.help/CentOS5-Base-163.repo

4、运行yum makecache生成缓存
[[email protected] yum.repos.d]# yum makecache

5、这时候再更新系统就会看到以下mirrors.163.com信息
1
2

[[email protected] yum.repos.d]# yum -y update
已加载插件：fastestmirror, refresh-packagekit, security
设置更新进程Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com