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Chapter 30. Sharing a mount on multiple mount points
As a system administrator, you can duplicate mount points to make the file systems accessible from multiple directories.
30.2. Creating a private mount point duplicate
This procedure duplicates a mount point as a private mount. File systems that you later mount under the duplicate or the original mount point are not reflected in the other.
Procedure
Create a virtual file system (VFS) node from the original mount point:
# mount --bind original-dir original-dir
Mark the original mount point as private:
# mount --make-private original-dir
Alternatively, to change the mount type for the selected mount point and all mount points under it, use the
--make-rprivate
option instead of--make-private
.Create the duplicate:
# mount --bind original-dir duplicate-dir
Example 30.1. Duplicating /media into /mnt as a private mount point
Create a VFS node from the
/media
directory:# mount --bind /media /media
Mark the
/media
directory as private:# mount --make-private /media
Create its duplicate in
/mnt
:# mount --bind /media /mnt
It is now possible to verify that
/media
and/mnt
share content but none of the mounts within/media
appear in/mnt
. For example, if the CD-ROM drive contains non-empty media and the/media/cdrom/
directory exists, use:# mount /dev/cdrom /media/cdrom # ls /media/cdrom EFI GPL isolinux LiveOS # ls /mnt/cdrom #
It is also possible to verify that file systems mounted in the
/mnt
directory are not reflected in/media
. For instance, if a non-empty USB flash drive that uses the/dev/sdc1
device is plugged in and the/mnt/flashdisk/
directory is present, use:# mount /dev/sdc1 /mnt/flashdisk # ls /media/flashdisk # ls /mnt/flashdisk en-US publican.cfg
Additional resources
-
mount(8)
man page
30.4. Creating a slave mount point duplicate
This procedure duplicates a mount point as a slave
mount type. File systems that you later mount under the original mount point are reflected in the duplicate but not the other way around.
Procedure
Create a virtual file system (VFS) node from the original mount point:
# mount --bind original-dir original-dir
Mark the original mount point as shared:
# mount --make-shared original-dir
Alternatively, to change the mount type for the selected mount point and all mount points under it, use the
--make-rshared
option instead of--make-shared
.Create the duplicate and mark it as the
slave
type:# mount --bind original-dir duplicate-dir # mount --make-slave duplicate-dir
Example 30.3. Duplicating /media into /mnt as a slave mount point
This example shows how to get the content of the /media
directory to appear in /mnt
as well, but without any mounts in the /mnt
directory to be reflected in /media
.
Create a VFS node from the
/media
directory:# mount --bind /media /media
Mark the
/media
directory as shared:# mount --make-shared /media
Create its duplicate in
/mnt
and mark it asslave
:# mount --bind /media /mnt # mount --make-slave /mnt
Verify that a mount within
/media
also appears in/mnt
. For example, if the CD-ROM drive contains non-empty media and the/media/cdrom/
directory exists, use:# mount /dev/cdrom /media/cdrom # ls /media/cdrom EFI GPL isolinux LiveOS # ls /mnt/cdrom EFI GPL isolinux LiveOS
Also verify that file systems mounted in the
/mnt
directory are not reflected in/media
. For instance, if a non-empty USB flash drive that uses the/dev/sdc1
device is plugged in and the/mnt/flashdisk/
directory is present, use:# mount /dev/sdc1 /mnt/flashdisk # ls /media/flashdisk # ls /mnt/flashdisk en-US publican.cfg
Additional resources
-
mount(8)
man page
30.5. Preventing a mount point from being duplicated
This procedure marks a mount point as unbindable so that it is not possible to duplicate it in another mount point.
Procedure
To change the type of a mount point to an unbindable mount, use:
# mount --bind mount-point mount-point # mount --make-unbindable mount-point
Alternatively, to change the mount type for the selected mount point and all mount points under it, use the
--make-runbindable
option instead of--make-unbindable
.Any subsequent attempt to make a duplicate of this mount fails with the following error:
# mount --bind mount-point duplicate-dir mount: wrong fs type, bad option, bad superblock on mount-point, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so
Example 30.4. Preventing /media from being duplicated
To prevent the
/media
directory from being shared, use:# mount --bind /media /media # mount --make-unbindable /media
Additional resources
-
mount(8)
man page