CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
或
curl -o /etc/yum.repos.d/CentOS-Base.repo
CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
或
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
或
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
CentOS 8
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
或
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
CentOS 8 Stream
wget -O /etc/yum.repos.d/CentOS-8-Stearm.repo https://file.xiaolan.xin/file/CentOS/CentOS-8-Stearm.repo
或
curl -o /etc/yum.repos.d/CentOS-8-Stearm.repo https://file.xiaolan.xin/file/CentOS/CentOS-8-Stearm.repo
重新生成缓存：
yum clean all && yum makecache