On Thu, Dec 02, 2021 at 16:27:00 +0100, Elias Mobery wrote:
OK, so I tried both ways. (The VM image is in the read-only squashfs.)
1.) Editing VM domain XML: <disk>
<transient/> </disk>
Error: Internal Error - Could not open /var/lib/libvirt/images/vm.snapshot1 : Permission Denied
I chowned everything to libvirt but no changes. Maybe a read-only conflict?
Yes, the overlay is created in the same path as the original image, just with a suffix, so if that is a read-only FS it will not work. I've thought about adding a possibility to specify the location for the overlay but didn't ever get to implementing it actually.
2.) Adding second disk to VM domain XML (shortened )
<disk> source /var/lib..../images/vm.qcow2 target dev=vda </disk>
<disk> source /var/lib...../images/vm.qcow2 target dev=vdb <transient/> </disk>
Error: unsupported configuration: cannot create external snapshot for disk vdb - collision with disk vdb.
Could you please post the unabbreviated steps? I don't really know what's going on based on this.
After googling I found that a lot of people get permission denied errors using transient. I will keep looking, really not sure.