虚拟机新挂载了一个硬盘，后面再虚拟机设置页面把硬盘删除了，虚拟机重启后报错
“Welcome to emergency mode! After logging in, type "Journalctl -xb " to view system logs, " systemctl reboot" to reboot, "systemctl default" or ^D to try again to boot into default mode.Give rot password for maintenance (or type Control-D to continue):”
现象：无法通过ssh访问
原因：设置里删了，但/etc/fstab里面的配置没删，导致出错。
解决：修改/etc/fstab配置文件，将不存在的硬盘注释或删除即可。重启后恢复正常！
