Centos7 更改yum 源

• 更换yum　源

以centos7为例 , 修改为阿里的yum源

1. 备份本地yum源

#下载　wget 工具

yum install wget -y

＃备份系统自带yum源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_$(date +%F)_backup

2.获取阿里yum源配置文件

 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo 
 

3.清理yum cache

 yum makecache 

4.更新

 yum -y update