Re: storage backup with encryption on-the-fly ?

On Thu, Apr 06, 2023 at 15:22:10 +0200, lejeczek 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. 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.