Use qemu-NBD to mount a virtual hard disk to the host.

In some systems, qemu-NBD is called KVM-NBD and qemu-NBD-xen. It's basically the same.

Use qemu-NBD to mount the virtual hard disk to the host. You need to do this:

Rmmod
NBD

Modprobe
NBD max_part = 8

By default, the function of adding partitions to NBD is disabled. You need to specify the max_part parameter. This parameter specifies how many partitions an NBD device can have.

Qemu-NBD
-- Connect =/dev/nbd0./testxp. img

Now you have installed the device on port 1024 of localhost.

 

Ls
/Dev/| grep NBD

Nbd0

Nbd0p1

As shown above, it is correct. Because my virtual disk has only one partition. If your virtual disk has multiple partitions, more should be displayed.

 

Fdisk
-L/dev/nbd0: view the status of the Virtual Disk and partition:

Disk
/Dev/nbd0: 10.7 GB, 10737418240 bytes

255
Heads, 63 sectors/track, 1305 Cylinders

Units
= Cylinders of 16065*512 = 8225280 bytes

Sector
Size (logical/physical): 512 bytes/512 bytes

I/O
Size (minimum/optimal): 512 bytes/512 bytes

Disk
Identifier: 0x6f0000f10

Device
Boot start end blocks ID system

/Dev/nbd0p1
* 1 1304 10474348 + 7 HPFs/NTFS

We can mount the/dev/nbd0p1 NTFS-format device to our host.

 

Fdisk
/Dev/nbd0 can enter interactive command lines.

Command
(M for help): m

Command
Action

A
Toggle a bootable flag

B
Edit BSD disklabel

C
Toggle the DOS compatibility flag

D
Delete a partition

L
List known partition types

M
Print this menu

N
Add a new partition

O
Create a new empty DOS partition table

P
Print the Partition Table

Q
Quit without saving changes

S
Create a new empty sun disklabel

T
Change a partition's System ID

U
Change display/entry units

V
Verify the Partition Table

W
Write table to disk and exit

X
Extra functionality (experts only)

You can list, add, and delete partitions.

 

I would like to thank my colleague Cooper for the max_part parameter. Thank you!