In other yum source Linux-

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

Here is the Ali Baba, you can also use source NetEase or other companies, to find their own URLs

If wget command does not take effect, indicating that no installation tool wget, enter yum -y install wgetEnter the installation.

The current directory is /etc/yum.repos.d/, just downloaded Centos-7.repo also on this directory

3, the original repo file backup system

mv  CentOs-Base.repo CentOs-Base.repo.bak

4, the principle of replacing repo file system

mv 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.