Re: [libvirt] Domain XML isn't dumping full backing chain
On 03/18/2015 07:03 AM, Deepak Shetty wrote:
[please don't top-post on technical lists]
Hmm interesting, so without adding backing_fmt, if i enable the below
in
/etc/libvirt/qemu.conf, will it work ?
# If allow_disk_format_probing is enabled, libvirt will probe disk
# images to attempt to identify their format, when not otherwise
# specified in the XML. This is disabled by default.
#
# WARNING: Enabling probing is a security hole in almost all
# deployments. It is strongly recommended that users update their
# guest XML <disk> elements to include <driver type='XXXX'/>
# elements instead of enabling this option.
#
#allow_disk_format_probing = 1
It _might_ work in that libvirt will then probe the backing chain as
qcow2, rather than treating it as raw; on the other hand, the upcoming
qemu 2.3 is trying to deprecate probing altogether because of the
security problems it represented, and so you may reach a point where
even if you tell libvirt it is okay to probe, that qemu will refuse to
open your image if you didn't specify backing format.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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