Linux（Centos7）配置更换 163yum源

1.先备份原镜像文件

cp -r yum.repos.d/ yum.repos.d.backup

2.下载新的CentOS-Base.repo 到/etc/yum.repos.d/

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo

3.把每个baseurl后边的$releasever替换成7,把$basearch替换成x86_64

3.清除原有yum缓存

yum clean all

4.yum makecache

yum makecache