Reviewed: https://review.opendev.org/710790
Committed:
https://git.openstack.org/cgit/openstack/nova/commit/?id=f5bc2c7ae45d83d90770a3e55bac0ae2465a8775
Submitter: Zuul
Branch: stable/stein
commit f5bc2c7ae45d83d90770a3e55bac0ae2465a8775
Author: Lee Yarwood <lyarw...@redhat.com>
Date: Wed Feb 19 20:39:54 2020 +0000
libvirt: Provide the backing file format when creating qcow2 disks
Libvirt v6.0.0 [1] will now fail to launch a domain when using qcow2
disks where the backing file format is not recorded in the qcow2
metadata.
There are some discussions upstream around relaxing this slightly [2]
but for now any attempt to launch an instance using qcow2 disks will
fail as Nova does not populate this value when creating the disk.
Nova needs to at a minimum start populating this field and depending on
the outcome of the thread upstream in Libvirt also potentially handle
the upgrade case where we may need to rebase existing disks in order to
update the metadata.
For now this change simply adds the backing_fmt option to the qemu-img
command line used to create these disks.
[1]
https://github.com/libvirt/libvirt/commit/3615e8b39badf2a526996a69dc91a92b04cf262e
[2] https://www.redhat.com/archives/libvir-list/2020-February/msg00616.html
Partial-Bug: #1864020
Change-Id: I77ebada015f6522a300be4fa043fb8676458402b
(cherry picked from commit 0cfe9c81e3fe4d268c9949c6b8e873abab94a407)
(cherry picked from commit 7fd41e9b8c0f0f9cbccd63fbdbcc863de7db50f5)
** Tags added: in-stable-stein
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https://bugs.launchpad.net/bugs/1864020
Title:
libvirt.libvirtError: Requested operation is not valid: format of
backing image %s of image %s was not specified in the image metadata
(See https://libvirt.org/kbase/backing_chains.html for
troubleshooting)
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