How to access img image in KVM?

Question

linux

The redhat website has detailed instructions on how to mount an img image of a kvm virtual machine and access it, the kpartx tool is suggested.
But when I enter the command:
kpartx -a /path/to/guest.img
Absolutely nothing happens - the output of the command is empty, no device /dev/mapper/loop is added. How to win?

Answer 1

Solved the problem like this:

qemu-nbd -c /dev/nbd0 /path/to/guest.img
mount /dev/nbd0p1 /mnt

Answer 2

But when I enter the command:
Absolutely nothing happens - the output of the command is empty,

Add -v to the kpartx command line to make it non-empty -- and show the output.