Linux更换yum源

备份原来的源文件

cp etc/yum.repos.d/CentOS-Base.repo   etc/yum.repos.d/CentOS-Base.repo.back

添加阿里源

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

清楚缓存

yum nakecache