CentOS handover source yum

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1. Backup original image file, to facilitate late recovery

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

2. Download the new CentOS-Base.repo to /etc/yum.repos.d/

Centos5地址：
[root@opt ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

Centos6地址：
[root@opt ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

Centos7地址：
[root@opt ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3. clear cache

[root@opt ~]# yum clean all

4. Cache generation

[root@opt ~]# yum makecache