[Openstack-operators] [nova] nova-compute automatically disabling itself?

Eric Fried openstack at fried.cc
Wed Jan 31 21:46:01 UTC 2018

There's [1], but I would have expected you to see error logs like [2] if
that's what you're hitting.



On 01/31/2018 03:16 PM, Chris Apsey wrote:
> All,
> Running in to a strange issue I haven't seen before.
> Randomly, the nova-compute services on compute nodes are disabling
> themselves (as if someone ran openstack compute service set --disable
> hostX nova-compute.  When this happens, the node continues to report
> itself as 'up' - the service is just disabled.  As a result, if enough
> of these occur, we get scheduling errors due to lack of available
> resources (which makes sense).  Re-enabling them works just fine and
> they continue on as if nothing happened.  I looked through the logs and
> I can find the API calls where we re-enable the services (PUT
> /v2.1/os-services/enable), but I do not see any API calls where the
> services are getting disabled initially.
> Is anyone aware of any cases where compute nodes will automatically
> disable their nova-compute service on their own, or has anyone seen this
> before and might know a root cause?  We have plenty of spare vcpus and
> RAM on each node - like less than 25% utilization (both in absolute
> terms and in terms of applied ratios).
> We're seeing follow-on errors regarding rmq messages getting lost and
> vif-plug failures, but we think those are a symptom, not a cause.
> Currently running pike on Xenial.
> ---
> v/r
> Chris Apsey
> bitskrieg at bitskrieg.net
> https://www.bitskrieg.net
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> OpenStack-operators mailing list
> OpenStack-operators at lists.openstack.org
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