备份现有的 yum 源配置文件

sudo mkdir /etc/yum.repos.d/backup
sudo mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/backup/

下载华为云的 CentOS 7 镜像源配置文件

sudo curl -o /etc/yum.repos.d/CentOS-Base.repo https://repo.huaweicloud.com/repository/conf/CentOS-7-reg.repo

清理并生成缓存

sudo yum clean all
sudo yum makecache

测试镜像源

sudo yum update