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）。