修改 /etc/yum.repos.d/CentOS-Base.repo，CentOS-AppStream.repo，CentOS-Extras.repo
修改如下：注释mirrorlist
把baseurl取消注释并修改为阿里云镜像地址
把阿里云地址改为$releasever-stream才生效
baseurl=https://mirrors.aliyun.com/centos/$releasever-stream/extras/$basearch/os/Linux SentOS8终端安装软件出现“AppStream“下载元数据失败
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