1.下载wget
yum -y install wget
2.备份系统的yum源如果备份不成功可以单独拉出来一份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
3.下载阿里的源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
- 查看更改`
vi /etc/yum.repos.d/CentOS-Base.repo
5.清空原来yum源头缓存
yum clear all
6.运行makecache生成缓存
yum makecache