live migration - CPU doesn't have compatibility

asked 2019-01-28 01:34:05 -0500

Am Ab
25 ●9 ●14 ●21

updated 2019-01-28 01:43:16 -0500

Hello,

Two servers and CPU models are exactly identical but only spec_ctrl, intel_stibp flags are enabled on one of them. When I try to Live Migrate an instance I get the following error:

#openstack server migrate 68d23265-93f1-486e-a4a0-b1b0ac0f35ba --live compute2 Unacceptable CPU info: CPU doesn't have compatibility.

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Refer to http://libvirt.org/html/libvirt-libvi... (HTTP 400) (Request-ID: req-c45afe07-b557-4bd5-abff-0ba5a56bb7c0)

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answered 2019-01-28 07:10:13 -0500

blakehenderson
36 ●1 ●3

updated 2019-01-28 07:17:21 -0500

The CPU flags do not match --- you need to use the cpu-mode and cpu-model configs for nova-compute.

\this worked for me. in /etc.nova/nova.conf cpu-mode -- custom # think it might actually be cpu_mode and and cpu_model cpu -model kvm64

if using juju juju config nova-compute cpu-mode='custom' juju config nova-compute cpu-model='kvm64'

Also- you will need to restart the nova-compute service after.

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Thanks. That works, but what about the VM's with config drive? instances with enabled config drive with fail with the following error: compute01 is not on shared storage: Shared storage live-migration requires either shared storage or boot-from-volume with no local disks. (HTTP 400) (Request-ID: req

Am Ab ( 2019-01-28 10:07:54 -0500 )edit

From my experience so far instances with config drive can also be live-migrated if the compute nodes share the same storage. In my case, it's Ceph as storage backend for glance, nova and cinder.