If you see a broken image, please right-click and select 'Open image in a new tab'. We apologize for this inconvenience. How to force "FSCK" filesystem check. One of the server that I manage has problem as below when I want to edit some files in crontab :. The read-only has been mounted as read-only because file-system facing some error. Before we do fsck , we need to unmount the directory but following error occurred:.
Using lsof , we can list out all the open files:. The 2nd column shows PID of the locking process. We need to stop this process using kill command:. Make sure that there is no error being prompt during the unmounting process. Do not run fsck on a mounted device, you will need to unmount the target first to avoid damage to your files.
The UUID is a fixed value assigned to your device and will not be affected by these system changes. This is a list of the codes that may be returned from fsck after inspecting a disk. Your exit code will be a sum of these codes if you analyze one disk. If you are using fsck on multiple devices, it will return the bit-wise OR of the two sums.
Now that you are a tad bit familiar with the fsck command, let's see practical use cases of this command. Check the output for any errors. There are also some option flags that we can add to allow some automated correction.
These commands aren't standardized though, and you should verify the filesystem type and compare documentation from that specific man page. Despite that, generally you can use -p to allow fsck to automatically apply repairs. You cannot unmount the root partition while the system is active. If you suspect your main file system is corrupted, you have to use a different approach here. There are actually a few different options that you can use. You can run fsck at boot time, in rescue mode, or use a recovery-themed live cd.
However, if the process is interrupted, fsck will finish the ongoing check and then stop. In case the utility found an error while the check was in process, it will not try to fix anything if interrupted.
You can rerun the check next time and let it finish. To wrap up, below is the list of the options you can use with the fsck Linux utility. Now you know how to use fsck Linux command to check and repair filesystems. Make sure you have root permissions before running the listed commands.
For a detailed description of all options, you can consult the man file of the tool or visit the fsck Linux man page. Introduction The fsck File System Consistency Check Linux utility checks filesystems for errors or outstanding issues. Was this article helpful? Goran Jevtic. Working with multiple departments and on various projects, he has developed an extraordinary understanding of cloud and virtualization technology trends and best practices.
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