问题：云环境下CentOS系统断电或强制关机，再开机出现问题：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.
解决方法：
1.查看系统日志，找到问题所在,发现有标红的，说明此处有问题；
:/# journalctl
2.输入命令
:/# xfs_repair -v -L /dev/dm-0
注：-L 选项指定强制日志清零，强制xfs_repair将日志归零，即使它包含脏数据（元数据更改）