Ali centos yum source configuration under 7

1, open the centos yum folder

cd /etc/yum.repos.d/

2, download repo file with wget

wget http://mirrors.aliyun.com/repo/Centos-7.repo

If wget command does not take effect, indicating that no installation tool wget,

yum -y install wget

 Enter to install.
The current directory is /etc/yum.repos.d/, just downloaded Centos-7.repo also on this directory
3, the original repo file backup system

Hundreds Base.repo mv-cent-Base.repo.bak

I.e., rename-Base.repo CentOs -> CentOs-Base.repo.bak
. 4, the principles of the replacement system file repo

mv Centos-7.repo CentOs-Base.repo

That is to rename Centos-7.repo -> CentOs-Base.repo

5, to perform the command yum update source

yum clean all
yum makecache
yum update

In order to perform the above three commands that is configured.