Add option to fstab Post: 302593056

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Top Forums Shell Programming and Scripting Add option to fstab Post 302593056 by Corona688 on Wednesday 25th of January 2012 01:02:52 PM

01-25-2012

Registered User

I really don't think it'd make sense to add it to 'swap' partitions. In fact, I think you should be very careful what partitions you do add it to. meanwhile, now that you're forewarned, here's what you wanted (except without swap):

Code:

$ awk '!/^#/ && ($2 != "swap") { if(!match(/noatime/, $4)) $4=$4",noatime" } 1' fstab

# /etc/fstab
# Created by anaconda on Mon Oct 31 20:44:41 2011
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg_centos60-lv_root / ext4 defaults,noatime 1 1
UUID=d4c12a62-6452-490e-a345-529e76c4c30b /boot ext4 defaults,noatime 1 2
/dev/mapper/vg_centos60-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults,noatime 0 0
devpts /dev/pts devpts gid=5,mode=620,noatime 0 0
sysfs /sys sysfs defaults,noatime 0 0
proc /proc proc defaults,noatime 0 0

$

You'd want to use it like

Code:

awk ... /etc/fstab > /tmp/$$
cat /tmp/$$ > /etc/fstab
rm /tmp/$$

And of course, test this thoroughly before letting it replace real data. Messing up your fstab's would really stink.

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LEARN ABOUT CENTOS

systemd-fstab-generator

SYSTEMD-FSTAB-GENERATOR(8)				      systemd-fstab-generator					SYSTEMD-FSTAB-GENERATOR(8)

NAME

       systemd-fstab-generator - Unit generator for /etc/fstab

SYNOPSIS

       /usr/lib/systemd/system-generators/systemd-fstab-generator

DESCRIPTION

       systemd-fstab-generator is a generator that translates /etc/fstab (see fstab(5) for details) into native systemd units early at boot and
       when configuration of the system manager is reloaded. This will instantiate mount and swap units as necessary.

       The <term>passno</term> field is treated like a simlpe boolean, and the ordering information is discarded. However, the root filesystem is
       checked before all the other filesystems.

       See systemd.mount(5) and systemd.swap(5) for more information about special /etc/fstab mount options this generator understands.

       systemd-fstab-generator implements the generator specification[1].

KERNEL COMMAND LINE

       systemd-fstab-generator understands the following kernel command line parameters:

       fstab=, rd.fstab=
	   Takes a boolean argument. Defaults to "yes". If "no", causes the generator to ignore any mounts or swaps configured in /etc/fstab.
	   rd.fstab= is honored only by initial RAM disk (initrd) while fstab= is honored by both the main system and the initrd.

SEE ALSO

       systemd(1), fstab(5), systemd.mount(5), systemd.swap(5), systemd-cryptsetup-generator(8)

NOTES

	1. generator specification
	   http://www.freedesktop.org/wiki/Software/systemd/Generators

systemd 208														SYSTEMD-FSTAB-GENERATOR(8)