問題：雲環境下CentOS系統斷電或強制關機，再開機出現問題：Entering emergency mode. Exit the shell to continue.
Generating "/run/initramfs/rdsosreport.txt"
Entering emerfency mode. Exit the shell to continue.
Type "jaurnalctl" to view system logs.
You might want to saue "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
after mounting them and attach it to a bug report.
解決方法：
1.查看系統日志，找到問題所在,發現有標紅的，說明此處有問題；
:/# journalctl
2.輸入命令
:/# xfs_repair -v -L /dev/dm-0
注：-L 選項指定強制日志清零，強制xfs_repair將日志歸零，即使它包含臟數據（元數據更改）