将ext3图像转换为qcow2格式

Question

I have an ext3 image. But I need image in qcow2 format to bring up the VM using qemu. Is there any command to create qcow2 from ext3 format?

Answer 1

Assumptions:

• QEMU already installed

• "ext3 format" is an image of a HDD ext3 partition eg created by dd (probably really a raw file)

  qemu-img convert -O qcow2 image.ext3 image.qcow2

Answer 2

My improvised method:

• Create a qcow2 image disk with enough space to accommodate the ext3 image.

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

• Expose the qcow2 image as a device.

   modprobe nbd qemu-nbd -c /dev/nbd0 disk.qcow2 

• Create a linux partition inside the qcow2 disk.

   cfdisk /dev/nbd0 

• Copy the the ext3 image over the linux partition.

   dd if=image.ext3 of=/dev/nbd0p1 

• Disconnect the qcow2 device.

   sync qemu-nbd -d /dev/nbd0 

Ready! :)