On 06/04/2023 16:12, Peter Krempa wrote:
Hi guys.
Is there a solution, perhaps a function of libvirt, to backup guest's storage and encrypt the resulting image file? On-the-fly ideally. If not ready/built-in solution then perhaps a best technique you recommend/use? I currently use 'backup-begin' on qcow2s, which are LUKS encrypted.
On Thu, Apr 06, 2023 at 15:22:10 +0200, lejeczek wrote: libvirt's block code supports the raw+luks and qcow2+luks encrypted image formats with qemu. You should be able to use both for backups too:
<domainbackup mode='push'> <disks> <disk name='vda' type='file'> <driver type='qcow2'/> <target file='/tmp/backup-test-images/backup-vda.qcow2'> <encryption format='luks'> <secret type='passphrase' uuid='d5c7780c-80c4-45eb-bee9-9fbbc1f3847c'/> </encryption> </target> </disk> </domainbackup>
Another option would be to use an encrypted device-mapper device via the block backend.
Lastly if you need any other storage format the 'pull' mode of backups exposes a (optionally TLS-encrypted) NBD socket from where a client application can pull the blocks for backup and store them in any way it wants.
That works as I hoped, nice & smooth, I've not had the right xml syntax. Are there any docs with more details on the other two alternatives? many thanks, L.