tripleo-heat-templates/releasenotes/notes/nova_libvirt_cgroups-66b173...

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---
upgrade:
- |
To re-enable the QEMU driver features lost after the previous minor update,
such as `virsh cpu-stats`, or volume attachements for existing Nova Compute
instances, those need to be live-migrated (or cold-migrated) to either of
the newly updated Nova Compute hosts.
fixes:
- |
Tripleo Nova Libvirt service unit no longer manages the QEMU driver cgroups
by systemd, but delagates that to libvirt. In a result, newly created Nova
Compute instances no longer experience problems with volume attachements,
or executing virsh commands in the libvirt podman container, after the
libvirt service restarts multiple times.