After the virtual machine is forced to start, centos07 is prone to the following problems
Boot prompt: ENTERING EMERGENCY MODE. EXIT THE SHELL TO CONTINUE.
Solution:
1. According to the prompt, use the journalctl command to view the log , find the error log information, and confirm which device has the error according to the error information
Failed to open /sysroot/etc/fstab:Input/output error
2. Enter the command xfs_repair -v -L /dev/xxx to repair the device
I use the following command and the following picture appears successfully
umount /dev/dm-0
xfs_repair -v -L /dev/dm-0
3.reboot restarts the virtual machine
Knowledge about xfs_repair
xfs_repair -h
xfs_repair: invalid option -- 'h'
Usage: xfs_repair [options] device
Options:
-f The device is a file
-L Force log zeroing. Do this as a last resort.
-l logdev Specifies the device where the external log resides.
-m maxmem Maximum amount of memory to be used in megabytes.
-n No modify mode, just checks the filesystem for damage.
-P Disables prefetching.
-r rtdev Specifies the device where the realtime section resides.
-v Verbose output.
-c subopts Change filesystem parameters - use xfs_admin.
-o subopts Override default behaviour, refer to man page.
-t interval Reporting interval in minutes.
-d Repair dangerously.
-V Reports version and exits.
After the virtual machine is forced to start, centos07 is prone to the following problems
Boot prompt: ENTERING EMERGENCY MODE. EXIT THE SHELL TO CONTINUE.
Solution:
1. According to the prompt, use the journalctl command to view the log , find the error log information, and confirm which device has the error according to the error information
Failed to open /sysroot/etc/fstab:Input/output error
2. Enter the command xfs_repair -v -L /dev/xxx to repair the device
I use the following command and the following picture appears successfully
umount /dev/dm-0
xfs_repair -v -L /dev/dm-0
3.reboot restarts the virtual machine
Knowledge about xfs_repair
xfs_repair -h
xfs_repair: invalid option -- 'h'
Usage: xfs_repair [options] device
Options:
-f The device is a file
-L Force log zeroing. Do this as a last resort.
-l logdev Specifies the device where the external log resides.
-m maxmem Maximum amount of memory to be used in megabytes.
-n No modify mode, just checks the filesystem for damage.
-P Disables prefetching.
-r rtdev Specifies the device where the realtime section resides.
-v Verbose output.
-c subopts Change filesystem parameters - use xfs_admin.
-o subopts Override default behaviour, refer to man page.
-t interval Reporting interval in minutes.
-d Repair dangerously.
-V Reports version and exits.