一、备份系统旧配置文件centos
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup缓存
二、获取对应版本的CentOS-Base.repo 到/etc/yum.repos.d/目录
替换以前先备份旧配置ide
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup阿里云
centos各版本的源配置列表
centos5centos7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos5_base.repoget
centos6it
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos6_base.repoclass
centos7（腾讯yum源）配置
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo
（阿里云yum源）
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo腾讯
更新缓存
yum clean allyum makecache