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I need to run fsck so that it automatically fixes problems (i.e., fsck -y). And because I am using "systemd" instead of "init" in the linux system, I cannot modify the /etc/default/rcS.

So what should I do to make this check run automatically?

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    What do you mean by "automatically"? Each time you mount the fs? If so, you could consider tune2fs. E.g.: tune2fs -c 1 /dev/sda1 to run fsck each time you mount /dev/sda1 partition. It only works with ext2/ext3 volumes. – Laurent C. Apr 1 '14 at 10:15
  • I hqve got this error when i start the machine: /etc/sda2: unexpected inconsistency; run fsck manually I waht that the check will be auto, not manually – Bingo Apr 1 '14 at 11:11
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    If that error pops up there you have a serious error that should be looked at manually. – Nils Apr 3 '14 at 15:13
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In the structure of the /etc/fstab file you can request the filesystem to be checked each time the system is booted - example :

/dev/sda1       /       ext4      errors=remount-ro,relatime      0       1
/dev/sda2       swap    swap      defaults        0       0
proc            /proc   proc      defaults        0       0
sysfs           /sys    sysfs     defaults        0       0
devtmpfs        /dev    devtmpfs  rw              0       0

The last column (6th) indicates in which order you want the filesystems be checked at boot time. 0 means no check, 1 the first check, 2 the second, ... Filesystem with the same pass number are checked in parallel.

For information and completness:

  • First column : device of the filesystem
  • Second column : where to mount the filesystem
  • Third column : type of filesystem
  • Fourth column : options passed to mount when mounting the filesystem
  • Fifth column : if the filesystem needs to be included (1) or not (0) by the dump command
  • Sixth column : pass of the automatic filesystem check at boot, 0 means no check.

If the filesystem check returns a fatal error during boot, you will be prompted to enter into the filesystem repair mode (basically single-user mode text console).

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    FYI: Op left a comment after you answered clarifying that he/she wants to run fsck -y; fsck is already being run (just without -y). – derobert Apr 1 '14 at 22:04

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