[root@ns518 wp-content]# yum update
CentOS Linux 8 - AppStream 197 B/s | 38 B 00:00
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
KS安装的centos,
yum -y install python 失败。update也不行，替换阿里/163/腾讯云的源都不行，于是如下操作解决：
https://serverfault.com/questions/1093922/failing-to-run-yum-update-in-centos-8
sed -i 's|baseurl=http://vault.centos.org|baseurl=http://vault.epel.cloud|g' /etc/yum.repos.d/CentOS-Linux-*
dnf –disablerepo ‘*’ –enablerepo=extras swap centos-linux-repos centos-stream-repos
dnf distro-sync
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