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
    You have to either run that command during boot (rc.local) or put an entry in /etc/fstab. What makes you think this is clogging up /etc/fstab ? , this is what fstab is for, fstab is much "cleaner" then rc.local – Panther Nov 16 '14 at 18:30

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
  • So you recommend just copy/paste from /proc/mounts to /etc/fstab? – Alexander Kim Nov 17 '14 at 4:29
  • Yes, that should work. Just copy both the original mount and the mount --bind – ryanmjacobs Nov 17 '14 at 4:45
  • Thanks, but mount --bind doesn't saved in /proc/mounts ? – Alexander Kim Nov 17 '14 at 5:22
  • No, I guess it doesn't; but, it shouldn't be too hard to copy the first mount then add your own for mount --bind. – ryanmjacobs Nov 17 '14 at 6:10
  • just like in your example instead of rw,relatime,data=ordered type bind, right? – Alexander Kim Nov 17 '14 at 6:32

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

  • 2
    this should be the accepted solution. – Daksh Miglani Aug 31 '18 at 14:42

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

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

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