Centos8的镜像仓库停服无法连接切换国内镜像源

1 先备份之前的镜像仓库地址

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

2 切换阿里云镜像

  sudo curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo

3 清理缓存并更新

sudo yum clean all
 sudo yum makecache
sudo yum  update