1 .备份本地yum源配置文件
mv/etc/yum.repos.d/centos-base.repo/etc/yum.repos.d/centos-base.repo _ bak2. Alibaba cloud (阿里巴巴
wget-o/etc/yum.repos.d/centos-base.repo http://mirrors.a liyun.com/repo/centos-7.repo3.重建缓存
yum clean allyum makecache 4.检查配置是否成功
yum repolist