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在CentOS8上执行下面命令时报错 yum install epel-release CentOS Linux 8 - AppStream 23 B/s | 38 B 00:01 Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist 原因 在2022年1月31日，C

故障现象 [root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo [root@localhost ~]# yum makecache CentOS-8 - Base - mirrors.aliyun.com 76 B/s | 2.3 kB 00:30 [Errors during downloading metadata for repository