CentOS上使用yum安装软件,总是报错: [root@localhost ~]# 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 或者 也是报同样的错误 原因是CentOS8的官方yum源已经停止维护了,需要切换到 vault.…