CentOS7

curl -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.huaweicloud.com/repository/conf/CentOS-7-anon.repo > Centos-7.repo

CentOS8

curl -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.huaweicloud.com/repository/conf/CentOS-8-anon.repo  > Centos-8.repo

CentOS9

curl -O https://repo.huaweicloud.com/repository/conf/CentOS-9-anon.repo > Centos-9.repo

epel

 yum install -y epel-release

执行yum clean all清除原有yum缓存

执行yum makecache（刷新缓存）或者yum repolist all（查看所有配置可以使用的文件，会自动刷新缓存）。