Hello, The availability_zone field in the instances object is a read-only field that doesn’t have anything to do with the actual scheduling of instances. This has been covered numerous of times on the mailing list here. The request_specs table in the nova API database contains the specs for when an instance was launched and the JSON blob there (in the spec field) includes the field availability_zone which affects scheduling. Please not that it’s not supported or recommend to update that field and if you do it should be done using oslo_versionedobjects even though updating it directly in the database will make it appear to work but might not be without bugs. Best regards
On 6 Aug 2021, at 21:24, hai wu <haiwu.us@gmail.com> wrote:
It seems this 'AvailabilityZoneFilter' is really buggy. The 'instances' table 'availability_zone' field was already updated to match the target desired zone name, but 'AvailabilityZoneFilter' kept rejecting the request. I already restarted nova-api, nova-conductor, nova-scheduler services after updating this database field value, but that's not helpful.
In the source code in file '/usr/lib/python3/dist-packages/nova/scheduler/filters/availability_zone_filter.py', how does 'spec_obj' got its availability_zone value? I don't understand this particular code. This issue is really frustrating .. def host_passes(self, host_state, spec_obj): availability_zone = spec_obj.availability_zone
On Wed, Aug 4, 2021 at 5:11 PM hai wu <haiwu.us@gmail.com> wrote:
Hi,
How to update existing vm instances 'availability_zone' field in nova database 'instances' table? It turns out there are many VMs with default 'nova' availability zone, while the hypervisors are with another different target aggregate/availability zone name, thus live migration for these VMs are failing.
The strange thing is that the 'OS-EXT-AZ:availability_zone' output from 'openstack server show VM_NAME' is showing these VMs are already with the target availibity_zone name. No idea why we have this inconsistency.
Would it be ok to just update database table entry directly to set 'availility_zone' to different value for these VMs? Or there might be better alternatives I am not aware of?
Thanks, Hai