centos 8 yum命令报错
[vagrant@192.168.38.4] ~ >> sudo yum update
CentOS Linux 8 - AppStream 71 B/s | 38 B 00:00
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
参考https://www.centos.org/centos-linux-eol/
已经不维护了，所以换地址，执行如下命令，替换下yum.repos.d下的repo文件中的url地址域名
sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-Linux-*
sudo yum update下就可了
参考
https://stackoverflow.com/questions/70926799/centos-through-vm-no-urls-in-mirrorlist