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[Stephen Finucane <1741810@xxxxxxxxxxxxxxxxxx>]

We discussed this on IRC today [1]. In short, we realize that this was a
change in behaviour introduced in Liberty that should have been better
discussed at the time. However, Liberty was many years ago and it's
genuinely debatable whether this was ever intended behaviour, let alone
something we'd want to reintroduce support for.

Having discussed this, we're going to document this change in behaviour
in the docs and leave it there. If this (support for arbitrary image
metadata properties in this filter) is something you still see value in,
we'd probably have to treat it as a new feature. I'd encourage you to
file a spec [2] so we can evaluate the idea. If not, hopefully the
documentation change helps clarify things.

[1] http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2020-09-16.log.html#t2020-09-16T13:18:37
[2] https://specs.openstack.org/openstack/nova-specs/readme.html

** Changed in: nova
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1741810

Title:
  Filter AggregateImagePropertiesIsolation doesn't Work

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  Description
  ===========
  I tried to use filter AggregateImagePropertiesIsolation to isolate Windows instance for reducing number of Windows Licenses.

  I think nova scheduler in pike release, filter
  AggregateImagePropertiesIsolation always returned all hosts. If this
  is a bug, filter AggregateImagePropertiesIsolation needs to be fixed.

  
  Steps to reproduce
  ==================
  # add filter to nova.conf and restart nova scheduler
  [filter_scheduler]
  enabled_filters = AggregateImagePropertiesIsolation,RetryFilter,AvailabilityZoneFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter

  # image create with os property
  openstack image create --min-disk 3 --min-ram 512 --disk-format qcow2 --public --file windows.img img_windows
  openstack image create --min-disk 1 --min-ram 64 --disk-format qcow2 --public --file cirros-0.3.5-x86_64-disk.img img_linux
  openstack image set --property os=windows img_windows
  openstack image set --property os=linux img_linux

  # host aggregate create with os property
  openstack aggregate create os_win
  openstack aggregate add host os_win compute01
  openstack aggregate add host os_win compute02
  openstack aggregate set --property os=windows os_win
   
  openstack aggregate create os_linux
  openstack aggregate add host os_linux compute03
  openstack aggregate add host os_linux compute04
  openstack aggregate add host os_linux compute05
  openstack aggregate set --property os=linux os_linux

  # create flavor
  openstack flavor create --ram 1024 --disk 1 --vcpus 1 --public small
  openstack flavor create --ram 4096 --disk 20 --vcpus 2 --public medium

  # create windows instances
  openstack server create --image img_windows --network test-net --flavor medium --max 10 test-win

  
  Expected result
  ===============
  Windows instances can be found in compute01, compute02 only

  Actual result
  =============
  Windows instance was found in every hosts.


  Environment
  ===========
  1. Nova's version
  (nova-scheduler)[nova@control01 /]$ rpm -qa | grep nova
  python-nova-17.0.0-0.20171206190932.cbdc893.el7.centos.noarch
  openstack-nova-scheduler-17.0.0-0.20171206190932.cbdc893.el7.centos.noarch
  openstack-nova-common-17.0.0-0.20171206190932.cbdc893.el7.centos.noarch
  python2-novaclient-9.1.0-0.20170804194758.0a53d19.el7.centos.noarch

  2. hypervisor
  (nova-libvirt)[root@compute01 /]# rpm -qa | grep kvm
  qemu-kvm-common-ev-2.9.0-16.el7_4.11.1.x86_64
  libvirt-daemon-kvm-3.2.0-14.el7_4.5.x86_64
  qemu-kvm-ev-2.9.0-16.el7_4.11.1.x86_64

  2. Storage
  ceph version 12.2.1 (3e7492b9ada8bdc9a5cd0feafd42fbca27f9c38e) luminous (stable)

  3. Networking
  Neutron with OpenVSwitch

  
  Logs & Configs
  ==============
  $ tail -f nova-scheduler.log | grep AggregateImagePropertiesIsolation
  2018-01-08 11:52:53.964 6 DEBUG nova.filters [req-3828686f-1d46-407a-bebb-14f7a573c52e 9b1f4f0bcea2428c93b8b4276ba67cb7 188be4011b2b49529cbdd6eade152233 - default default] Filter AggregateImagePropertiesIsolation returned 5 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104

  # add filter to nova.conf and restart nova scheduler
  [filter_scheduler]
  enabled_filters = AggregateImagePropertiesIsolation,RetryFilter,AvailabilityZoneFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter

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