是一臺阿里雲ecs服務器，通過vnc登錄看到如下信息，進入了救援模式：
Generating “/run/initramfs/rdsosreport.txt”
“Entering emergency mode. Exit the shell to continue”
“Type ‘journalctl’ to view system log.”
You might want to save “/run/initramfs/rdsosreport.txt” to a USB stick or /boot after mounting them and attach it to a bug report.
journalctl提示/dev/vda1 contains a file system with errors,check forced
fsck failed with error code 4.
Failed to start FIle System Check on /dev/disk/by-uuid/xxx
Dependency failed for /sysroot.
等很多錯誤，無法看到操作系統啓動到哪個地方進入的救援模式！
在:/#下執行fsck -y /dev/vda1，有fsck命令，提示/dev/vda1 is mounted
將該目錄umount掉，再次重啓就可以正常進入系統