centos7 怎么更换镜像源

1. 首先备份/etc/yum.repos.d/CentOS-Base.repo

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

    2.下载对应版本repo文件, 放入/etc/yum.repos.d/(操作前请做好相应备份)

Centos7:

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

Centos6:

wget -P /etc/yum.repos.d http://mirrors.163.com/.help/CentOS6-Base-163.repo

Centos5:

wget -P /etc/yum.repos.d http://mirrors.163.com/.help/CentOS5-Base-163.repo

    3.运行以下命令生成缓存

yum clean all
yum makecache