Failed to download metadata for repo ‘AppStream’ [CentOS]

文章目录
CentOS 8 上运行 `yum update`报错如下修复无法为 repo 下载数据

CentOS 8 上运行 yum update报错如下
[root@autocontroller ~]# yum update
CentOS-8 - AppStream 70 B/s | 38 B 00:00
Error: Failed to download metadata for repo 'AppStream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

/var/log/dnf.log更多调试信息的输出
2022-02-02T11:39:36Z DEBUG error: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos

Failed to download metadata for repo ‘AppStream’ [CentOS]最先出现在Python成神之路。