[Qemu-devel] Qcow file does not mount

[Qemu-devel] Qcow file does not mount

[Atlas Khan]

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I am doing a task in which I have to enter some data which is in a
directory in qcow/qcow2 file. The thing I want to ask is that how can I do
this if I have boot looder or  guest system in a directory rather than in
iso file. I try to make a qcow image and mount it on my file system.
Process for mounting which i m following is

$ modprobe nbd max_part=63
$ qemu-nbd -c /dev/nbd0 image.img
$ mount /dev/nbd0p1 /mnt/image

I have a qcow file of malta mips. If run these commands on malta mips qcow
file, It mount it. But if i try to mount a qcow file created by following
command

qemu-img create -f qcow2 test.qcow2 10G

it give following error

mount: special device /dev/nbd0p1 does not exist

can any one help me how can I write some data in qcow or mount my qcow file.

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Re: [Qemu-devel] Qcow file does not mount

[Kevin Wolf]

Am 19.03.2014 um 07:06 hat Atlas Khan geschrieben:
> I am doing a task in which I have to enter some data which is in a directory in
> qcow/qcow2 file. The thing I want to ask is that how can I do this if I have
> boot looder or  guest system in a directory rather than in iso file. I try to
> make a qcow image and mount it on my file system. 
> Process for mounting which i m following is 
> 
> $ modprobe nbd max_part=63
> $ qemu-nbd -c /dev/nbd0 image.img
> $ mount /dev/nbd0p1 /mnt/image
> 
> I have a qcow file of malta mips. If run these commands on malta mips qcow
> file, It mount it. But if i try to mount a qcow file created by following
> command
> 
> qemu-img create -f qcow2 test.qcow2 10G
> 
> it give following error
> 
> mount: special device /dev/nbd0p1 does not exist
> 
> can any one help me how can I write some data in qcow or mount my qcow file.

A new image is unpartitioned. You need to use something like fdisk on
/dev/nbd0 first in order to create the partitions. After that, you may
or may not need to restart qemu-nbd, not completely sure.

Kevin