How to make mount --bind permanent?

When I am doing:

mount --bind dirone dirtwo

After OS reboot the binding is lost.

I am checking binded dirs in /proc/mounts

How can I make these binds permanent without clogging up /etc/fstab ?

Here's one entry from /proc/mounts

/dev/disk/by-uuid/4f5082d7-aba2-4bc7-8d64-3bbb3d773aab /home/username/dir ext4 rw,relatime,data=ordered 0 0

1

4 Answers

What do you mean "clogging up /etc/fstab"? The best place to put this in is /etc/fstab; that's what it was made for!

All you have to do is add one line after the first mount:

# <device> <dir> <type> <options> <dump> <pass>
UUID=288a84bf-876c-4c4b-a4ba-d6b4cc6fc0d2 /mnt/device ext4 defaults,noatime,nofail 0 2
/mnt/device /srv/binded_device none bind 0 0

7

The easiest way is to mount --bind what you need like

mount --bind /home/sda1/Windows/Users/Me/Dropbox ~/Dropbox

Then open mtab

sudo nano /etc/mtab

Copy your line like

/home/sda1/Windows/Users/Me/Dropbox /home/me/Dropbox none rw,bind 0 0

and paste it in fstab so it would mount on reboot

sudo nano /etc/fstab

If you folder is on mounted disk make sure your binding line comes after disk mount

1

Another solution (which is helpful when you're using LVM and the accepted answer will not work and some may consider more useful since it uses a bit more logic) would be doing something similar to this:

Append the following to your crontab
# crontab -l | tail -1 ; cat /usr/sbin/custom-compiler-mount

@reboot /usr/sbin/custom-compiler-mount

Essentially you would use crond to execute a script on reboot

#!/bin/bash
( until [[ $( (mount |& grep vg0-homevol 2>&1 9<&1 > /dev/null 1<&9) ) ]] ;
do
sleep 1
done & wait;mount -o rbind /home/linuxgeek/experimental/s3/gcc/ /gcc & ) & >/dev/null 

If this is a "per user" mount and not a system-wide mount, rather than using mount --bind or creating an /etc/fstab entry, why not use a symlink?

ln --symbolic target_dir access_point_of_target_dir

Add this line to the bottom of your user's .profile file to have it available automagically on login, without creating a system-wide fstab entry, and without needing root permissions like you will when putting mount --bind in a script.

It's not a perfect solution, but I have found that in most cases a symbolic link performs the same as having access to the physical directory.

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