[Bug 2011535] Re: nova can't access instance image file because the file is now chowned to the kvm group by default

[Corey Bryant]

** Changed in: nova (Ubuntu)
       Status: New => Triaged

** Changed in: nova (Ubuntu)
   Importance: Undecided => Critical

** Also affects: nova (Ubuntu Lunar)
   Importance: Critical
       Status: Triaged

** Also affects: nova (Ubuntu Kinetic)
   Importance: Undecided
       Status: New

** Changed in: nova (Ubuntu Kinetic)
       Status: New => Triaged

** Changed in: nova (Ubuntu Kinetic)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/2011535

Title:
  nova can't access instance image file because the file is now chowned
  to the kvm group by default

Status in nova package in Ubuntu:
  Triaged
Status in nova source package in Kinetic:
  Triaged
Status in nova source package in Lunar:
  Triaged

Bug description:
  It seems libvirt package in Ubuntu 22.04 uses the kvm group instead of the libvirt-qemu group when launching a qemu process.
  Because of this change and the default behavior of libvirt which makes all image files chowned by the group/user to run qemu process, the instance files are owned by the kvm group, instead of the libvirt-qemu group.

  However currently the nova user is still added to the libvirt-qemu
  group instead of the kvm group.

  Because of this inconsistency nova can't access to instance image once
  the files are chowned to the kvm group.

  nova 3:26.1.0-0ubuntu1~cloud0
  libvirt 8.0.0-1ubuntu7.4

  I've found the problem in puppet jobs. (example https://zuul.opendev.org/t/openstack/build/d6f2fb2e92ad4ece86bcd3d8793bf920 )
  Example error in nova can be found here: https://2e4f6457af6d4bb29c73-cc818d493c2a52ef4d37701157d67702.ssl.cf2.rackcdn.com/877214/2/check/puppet-openstack-integration-7-scenario002-tempest-ubuntu-jammy/d6f2fb2/logs/nova/nova-compute.txt

  I've tested adding the nova user to the kvm group and confirmed this fixes the error.
  https://review.opendev.org/c/openstack/puppet-openstack-integration/+/877338

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