General

Caution

Do not mount virtual machine's storage while it is running. This will cause data corruption.

QCOW2 (native LibvirtD format)

Step	Command	Reasons/Notes
1	`modprobe nbd max_part=8`	This loads Network Block Device kernel modules and defines maximum partitions to be 8. You can use your own number.
2	`qemu-nbd --connect=/dev/nbd0 /path/to/your/image.qcow2`	This 'probes the image with QEMU's tools. Essentially you are "mimicking" a network storage to mount it. The /dev/nbd0 is a "default", you can use your own, but recommending to keep the `/dev/` path as a good practice.
3	`fdisk -l /dev/nbd0`	You can now "probe" and list the actual device, including it's partitions. Possibly create new ones.
4	`mount /dev/nbd0p<number> /your/desired/mountpath`	This mounts the partition for writting.
5	`umount /your/desired/mountpath && qemu-nbd --disconnect /dev/nbd0`	When done, unmount it and disconnect it.
6	`rmmod nbd`	For consistency, you can also unload the NBD mod.

Step	Command	Reasons/Notes
1	`kpartx -av /path/to/your/raw.img`	First, you need to "mount" the image as loop, because of internal structure. This creates items under `/dev/`, named `loopXpY`.
2	`mount /dev/loopXpY /your/desired/mountpath/`	Mount it the standard way, append your mount options if needed.
3	`umount /your/mounted/mountpath`	Unmount it, when done.
4	`kpartx -dv /path/to/your/raw.img`	And release it completely for VM to use.