Linux Force fsck on the Next Reboot or Boot Sequence

I want to force fsck on the next reboot? How do I force fsck on a Linux based server or laptop? Is there any configuration file that I need to alter for this purpose on a Linux?

fsck command is used to check and optionally repair one or more Linux file systems. You don’t have to create or alter/modify any file. All you need to do is just create empty file called /forcefsck.[donotprint][/donotprint]

How does fsck force work at every boot on a Linux?

On a Debian or Ubuntu Linux /etc/init.d/checkfs.sh (or /etc/init/mountall.conf on a Ubuntu LTS v14.04+) is used to run fsck command if /forcefsck.

Check the /etc/init/mountall.conf file, for example the file from Ubuntu 14.04 LTS

script
    . /etc/default/rcS || true
    [ -f /forcefsck ] && force_fsck="--force-fsck"
    [ "$FSCKFIX" = "yes" ] && fsck_fix="--fsck-fix"
 
    # Doesn not work so well if mountall is responsible for mounting /proc, heh.
    if [ -e /proc/cmdline ]; then
        read line < /proc/cmdline
        for arg in $line; do
            case $arg in
                -q|--quiet|-v|--verbose|--debug)
                    debug_arg=$arg
                    ;;
            esac
        done < /proc/cmdline
    fi
    # set $LANG so that messages appearing in plymouth are translated
    if [ -r /etc/default/locale ]; then
        . /etc/default/locale || true
        export LANG LANGUAGE LC_MESSAGES LC_ALL
    fi
 
    exec mountall --daemon $force_fsck $fsck_fix $debug_arg

On a RHEL/CentOS 6.x /etc/rc.sysinit file is used to run fsck command. If there is a /fsckoptions file, the options are loaded from the /fsckoptions file. If there is a /forcefsck file, -f is added.

Check the /etc/rc.sysinit file, for example the file from RHEL/CentOS Linux 6.x

Fig.01: RHEL/CentOS 6.x /etc/rc.sysinit file,

Force fsck on boot using /forcefsck

By creating /forcefsck file you will force the Linux system (or rc scripts) to perform a full file system check. First, login as the root user:
$ su -
OR
$ sudo -s
Change directory to root (/) directory [optional]:
# cd /
Create a file called forcefsck:
# touch /forcefsck
Now, reboot the system:
# reboot

Frce fsck on next boot using shutdown command (may not work on many modern distros)

The -F option force fsck on reboot, login as root and type the following command to reboot and run fsck:
# shutdown -rF now
The above will check all the relevant partitions immediately.

A note about systemd based systems

The above mentioned solution only works with the old SysVinit and early versions of Upstart. It won’t work with systemd. systemd-fsck understands one kernel command line parameter:

fsck.mode=
One of “auto”, “force”, “skip”. Controls the mode of operation. The default is “auto”, and ensures that file system checks are done when the file system checker deems them necessary. “force” unconditionally results in full file system checks. “skip” skips any file system checks.

fsck.repair=
One of “preen”, “yes”, “no”. Controls the mode of operation. The default is ” preen”, and will automatically repair problems that can be safely fixed. “yes ” will answer yes to all questions by fsck and “no” will answer no to all questions.

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.