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Mount and use VirtualBox VDI disk container in Linux

№ 12688 В разделе Sysadmin от November 11th, 2025,
В подшивках: Linux, Virtualbox, Virtualization

Let’s say you need to create an image for your virtual machine where you’ll write some files or even create a special partition from an existing disk image. In Linux, you can mount this virtual disk image and use it like a regular block device!

The first step is to create your new virtual disk. This can be done directly in VirtualBox’s disk manager.

The next step is to install the necessary utilities and kernel modules from the Qemu distribution.

sudo apt install qemu-utils qemu-block-extra 
sudo modprobe nbd max_part=8
qemu-nbd --version

All preparations are complete; now you can specify the new block device.

sudo qemu-nbd -c /dev/nbd0 /tmp/New-disk-image.vdi

Finally, the final step is to create a partition table and a new partition on the new block device. As an example, I’ll create an EXT4 filesystem and mount it on my host system. You can also write special images using the dd utility.

cfdisk /dev/nbd0
mkfs.ext4 /dev/nbd0p1
tune2fs -L VDIPART1 /dev/nbd0p1

Just in case, let’s check the partition table.

vlad@turtle:/$ fdisk -l /dev/nbd0
Disk /dev/nbd0: 256 GiB, 274877906944 bytes, 536870912 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x10b50298

Device      Boot Start       End   Sectors  Size Id Type
/dev/nbd0p1       2048 536870911 536868864  256G 83 Linux

Now you can mount this partition as usual and then unmount it after you’re done.

sudo mount /dev/nbd0p1 /mnt/
sudo rsync -avz /my/special/files/ /mnt/
sudo umount /mnt

Disconnect. Required before use in VirtualBox!

qemu-nbd -d /dev/nbd0

You’re awesome.

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