On Tue, Sep 04, 2018 at 17:32:49 +0200, Gionatan Danti wrote:
Il 03-09-2018 13:14 Gionatan Danti ha scritto:
Hi list, suppose I have an immutable (ie: due to a read-only snapshot) backing file.
After creating an overlay file with "qemu-img create -f qcow2 -o backing_file=/path/to/immutable/file.img current.qcow2", libvirt refuse to start the virtual machine and exits with an error stating "Could not open backing file /path/to/immutable/file.img: Permission denied".
From my understanding, libvirtd is trying to change the owner/permissions/selinux context of the backing file but, being it immutable, fails to start the VM. Is that the expected behavior?
Thanks.
Hi all, any suggestion on the matter?
You forgot to specify the format of the backing file into the overlay file (qemu-img option -F). Libvirt treats any unspecified format as raw since it's not secure to do probing of the format.