Mount bind fstab linux

All about 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:

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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Conclusion

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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