Public bug reported:
bionic or focal with OpenStack Ussuri.
The latest version of the nova package sets permissions on package
update for /var/lib/nova:
find /var/lib/nova -exec chown nova:nova "{}" +
find /var/lib/nova -type f -exec chmod 0640 "{}" + -o -type d -exec chmod
0750 "{}" +
However, when managing vm's via libvirt, various ownership changes
happen to the underlying disks that mean that nova can no longer access
the disk files with 0640 permissions.
The disks (and base image) for a vm are created as nova:nova; libvirt
then shifts the ownership to libvirt-qemu:kvm as the vm starts. When
the vm is stopped the ownership reverts to root:root.
0640 permissions are maintained - however nova is not part of the root
or kvm groups so cannot access the file - which means the instance
cannot be restarted.
The following permissions are required for correct operation:
find /var/lib/nova -type f -exec chmod 0644 "{}" + -o -type d -exec
chmod 0755 "{}" +
** Affects: cloud-archive
Importance: Critical
Status: Triaged
** Affects: cloud-archive/ussuri
Importance: Critical
Status: Triaged
** Affects: cloud-archive/victoria
Importance: Critical
Status: Triaged
** Affects: nova (Ubuntu)
Importance: Critical
Status: Triaged
** Affects: nova (Ubuntu Focal)
Importance: Critical
Status: Triaged
** Affects: nova (Ubuntu Groovy)
Importance: Critical
Status: Triaged
** Also affects: nova (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: nova (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: cloud-archive
Importance: Undecided
Status: New
** Also affects: cloud-archive/ussuri
Importance: Undecided
Status: New
** Also affects: cloud-archive/victoria
Importance: Undecided
Status: New
** Changed in: cloud-archive/victoria
Status: New => Triaged
** Changed in: cloud-archive/ussuri
Status: New => Triaged
** Changed in: nova (Ubuntu Focal)
Status: New => Triaged
** Changed in: nova (Ubuntu Groovy)
Status: New => Triaged
** Changed in: cloud-archive/ussuri
Importance: Undecided => Critical
** Changed in: cloud-archive/victoria
Importance: Undecided => Critical
** Changed in: nova (Ubuntu Focal)
Importance: Undecided => Critical
** Changed in: nova (Ubuntu Groovy)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1885269
Title:
ussuri: unable to stop and start an instance post upgrade
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