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Hi Sylvain,
I mean launching "yum update" on compute nodes.
Now I am going to describe what happened.
We had an environment made up of 3 kvm nodes.
We added two new compute nodes.
Since the addition has been made after 3 or 4 months after the first
openstack installation, the 2 new compute nodes are updated to most recent
ocata packages.
So we launched a yum update also on the 3 old compute nodes.
After the above operations, the resource_providers table contains wrong
uuid for the 3 old nodes and they stooped to work.
Updating resource_providers uuid getting them from compute_nodes table, the
old 3 nodes return to work fine.
Regards
Ignazio

Il giorno mar 16 ott 2018 alle ore 16:11 Sylvain Bauza <sbauza at redhat.com>
ha scritto:

>
>
> On Tue, Oct 16, 2018 at 3:28 PM Ignazio Cassano <ignaziocassano at gmail.com>
> wrote:
>
>> Hi everybody,
>> when on my ocata installation based on centos7 I update (only update not
>> changing openstack version) some kvm compute nodes, I diescovered uuid in
>> resource_providers nova_api db table are different from uuid in
>> compute_nodes nova db table.
>> This causes several errors in nova-compute service, because it not able
>> to receive instances anymore.
>> Aligning uuid from compute_nodes solves this problem.
>> Could anyone tel me if it is a bug ?
>>
>>
> What do you mean by "updating some compute nodes" ? In Nova, we consider
> uniqueness of compute nodes by a tuple (host, hypervisor_hostname) where
> host is your nova-compute service name for this compute host, and
> hypervisor_hostname is in the case of libvirt the 'hostname' reported by
> the libvirt API [1]
>
> If somehow one of the two values change, then the Nova Resource Tracker
> will consider this new record as a separate compute node, hereby creating a
> new compute_nodes table record, and then a new UUID.
> Could you please check your compute_nodes table and see whether some
> entries were recently created ?
>
> -Sylvain
>
> [1]
> https://libvirt.org/docs/libvirt-appdev-guide-python/en-US/html/libvirt_application_development_guide_using_python-Connections-Host_Info.html
>
> Regards
>> Ignazio
>> _______________________________________________
>> OpenStack-operators mailing list
>> OpenStack-operators at lists.openstack.org
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>
>
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