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1、备份本地镜像源，将/etc/yum.repos.d/下所有文件备份到/etc/yum.repos.d/bak/下
2、下载阿里云镜像
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
3、清除yum缓存-yum clean all
4、验证镜像源仓库 yum repolist
1、备份本地镜像源，将/etc/yum.repos.d/下所有文件备份到/etc/yum.repos.d/bak/下
2、下载阿里云镜像
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
3、清除yum缓存-yum clean all
4、验证镜像源仓库 yum repolist