How to restore .img file with partition on it?

JustPfff

Hello, I need this as fast way to reinstall/restore OS I create/test on virtual environments.
I convert this image .qcow2 to raw .img file using command

qemu-img convert -f qcow2 -O raw my-os.qcow2 my-os.img
When I checked img file using fdisk I got this

fdisk -lu  my-os.img
Disk my-os.img: 8 GiB, 8589934592 bytes, 16777216 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: 0x2c54c34d

Device     Boot  Start      End  Sectors  Size Id Type
my-os.img1  *      2048   206847   204800  100M  7 HPFS/NTFS/exFAT
my-os.img2       206848 16775167 16568320  7.9G  7 HPFS/NTFS/exFAT

I was planning to restore it on the other virtual machine (using Live Linux CD) using dd command.

dd if=my-os.img of=/dev/vda1

But obviously this won't work, since the img file had two partitions.
So should I restore each both .img1 .img2 file to separated partition (e.g. sda1 and sda2) ?

alt_

dd if=my-os.img1 of=/dev/vda1
dd if=my-os.img2 of=/dev/vda2

I am not sure, but this probably works.

stoned

$  losetup --partscan --find --show my-os.img
/dev/loop20

# Inside loop20 would be your partitions by p1, p2, etc.
$  ls /dev/loop20*
/dev/loop20p3  /dev/loop20p2  /dev/loop20p1

# Mount them like this
$ sudo mount /dev/loop20p3 /mnt

# Or copy them using dd to somewhere else
$ dd if=/dev/loop20p3 of=/dev/vda3

But perhaps instead of all that, just write the my-os.img to /dev/vda (not a partition number)
dd if=my-os.img of=/dev/vda

Entire disk structure would be copied to the block device, including any partitions it may have inside.

JustPfff

@stoned said: $ losetup --partscan --find --show my-os.img

Thanks for reply, I reach similar idea to use losetup or kpartx, unfortunately my other VPS runs on OpenVZ ( which I kept the backup of .img file ) ,
I'll try to run it on my laptop (Arch Linux) and do the test again.