centos8 Error: yum Failed to download metadata for repo 'AppStream'

问题

centos8 yum 报错 yum Failed to download metadata for repo ‘AppStream’

解决方案

解决方案：找到配置文件打开 /etc/yum.repos.d 修改baseurl 为阿里云的地址 ：
cd /etc/yum.repos.d
vim CentOS-Base.repo

[BaseOS]
baseurl=https://mirrors.aliyun.com/centos/$releasever/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

搞定