Mount a qcow2 image
modprobe nbd max_part=8
Example is self-explanatory. Using a shutdown and backed up qcow2 VM disk image:
qemu-nbd -c /dev/nbd1 /var/lib/libvirt/images/new-ff.qcow2
Naturally, there should be an existing mount point, and check to see which partition to use. I.e. ndb1p1 is the first partition, equal to /dev/sda1:
mount /dev/nbd1p1 /mnt/new-ff
Unmount a qcow2 image (NB. Or you will corrupt the image if you start the VM!)
umount /mnt/new-ff
qemu-nbd -d /dev/nbd1
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