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All about bind mounts in Linux

by | Sep 19, 2021

Wondering how to use bind mounts in Linux? You are in luck! The Support Engineers at Bobcares are here to offer their expertise.

Bind mounts allow you to mount one path into another path. Read on to find out more about this advice by our in-house experts at Bobcares.

How to bind mounts in Linux

Bind mounts grants the users access to a directory by binding the directory to the same user’s home directory. Since Linux version 2.4.0 you can remount a section of the file hierarchy in another location with the command:

mount –bind olddir newdir

After this, the same file content is accessible in two different places. You can also choose to remount a single file.
Rather than mounting a device on a specific path, bind mounts grant you the ability to mount one path into another.

For instance, suppose you have a small /var and a huge /opt partition. In this case, you will require additional space for the growing log files.

Let’s see what the Support Team suggests in this scenario:
First, you need to shut down services responsible for writing to the log file. Then:

mv /var/log /opt/var_log
mkdir /var/log
mount -o bind /opt/var_log /var/log

This will be reflected when you run the mount command seen below:

# mount | grep var
/opt/var_log on /var/log type none (rw,bind)

By this point, you can restart the services stopped previously.
In case you want this to carry on across reboots, update the /etc/fstab also with bind mount.

# /etc/fstab
/opt/var_log              /var/log                 none    bind    0 0

This trick comes in handy until a long-term fix is in place.

Additional details about bind mounts in Linux

Bind mounts in Linux allow you to mount a previously-mounted system to a different location within the same file system. Additionally, bind mounts are used to restrict user access to specific parts of a website. This is done by replicating that website’s directory to the user’s home directory.
You can configure a bind mount with the command:

mount --bind /path/to/domain /path/to/home/directory

Run the following command to add a bind mount to the file system table:

/path/to/domain /path/to/home/directory none bind,nobootwait 0 0

In case the nobootwait is not present in the fstab entry, you will get a message like this:

Continue to wait; or Press S to skip mounting or M for manual recovery.

Adding nobodywait to the fstab configuration’s option section makes sure that the system boots even when the bind mount directory is removed from the system.

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In short, we learned all about bind mounts in Linux today. With our Support Team on your side, you have nothing to worry about.


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