** Also affects: nova/kilo
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1434429
Title:
libvirt: _compare_cpu doesn't consider NotSupportedError
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) kilo series:
New
Bug description:
Issue
=====
The libvirt driver method "_compare_cpu" doesn't consider that the
underlying libvirt function could throw a NotSupportedError (like
baselineCPU call in "host.py" module [1])
Steps to reproduce
==================
* Create setup with at least 2 compute nodes
* Create cinder volume with bootable image
* Launch instance from that volume
* Start live migration of instance to another host
Expected behavior
=================
If the target host has the same CPU architecture like the source host,
the live migration should be triggered.
Actual behavior
===============
The live migration gets aborted and rolled back because all libvirt
errors gets treated equally.
Logs & Env.
===========
section "libvirt" in "/etc/nova/nova.conf" in both nodes:
[libvirt]
live_migration_flag =
VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE,
VIR_MIGRATE_TUNNELLED
disk_cachemodes = block=none
vif_driver = nova.virt.libvirt.vif.LibvirtGenericVIFDriver
inject_partition = -2
live_migration_uri = qemu+tcp://stack@%s/system
use_usb_tablet = False
cpu_mode = none
virt_type = kvm
Nova version
------------
/opt/stack/nova$ git log --oneline -n5
90ee915 Merge "Add api microvesion unit test case for wsgi.action"
7885b74 Merge "Remove db layer hard-code permission checks for flavor-manager"
416f310 Merge "Remove db layer hard-code permission checks for
migrations_get*"
ecb306b Merge "Remove db layer hard-code permission checks for
migration_create/update"
6efc8ad Merge "libvirt: don't allow to resize down the default ephemeral disk"
References
==========
[1] baselineCPU call to libvirt catches NotSupportedError;
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/host.py#L753
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