centos8.4系统安装docker服务出现[错误：为 repo 'root_' 下载元数据失败]的问题解决方案

新服务器Centos 8.4在安装docker服务时一直出现:

yum update -y
created by dnf config-manager from file:///root/                                                0.0  B/s |   0  B     00:00    
Errors during downloading metadata for repository 'root_':
  - Curl error (37): Couldn't read a file:// file for file:///root/repodata/repomd.xml [Couldn't open file /root/repodata/repomd.xml]
错误：为 repo 'root_' 下载元数据失败 : Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

找了很久终于找到了解决方案:

找到 /etc/yum.repos.d 目录下的文件 root_.repo 打开后 

 

 将 enabled=1 修改为 enabled=0 保存变更内容就可以正常安装了