修改Centos默認yum源換成國內源

1、首先備份系統自帶yum源配置文件/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源配置文件所在的文件夾

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

3、下載163的yum源配置文件到上面那個文件夾內

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、運行yum makecache生成緩存

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