I have a small testbed OpenStack cloud (running Ocata) where I am trying to debug a problem with Nova scheduling.
In short: I see different behaviors when I create a new VM and when I try to migrate a VM Since I want to partition the Cloud so that each project uses only certain compute nodes, I created one host aggregate per project (see also this thread: http://lists.openstack.org/pipermail/openstack-operators/2018-February/014831.html ) The host-aggregate for my project is: # nova aggregate-show 52 +----+-----------+-------------------+--------------------------------------------------------------+----------------------------------------------------------------------------------------------+--------------------------------------+ | Id | Name | Availability Zone | Hosts | Metadata | UUID | +----+-----------+-------------------+--------------------------------------------------------------+----------------------------------------------------------------------------------------------+--------------------------------------+ | 52 | SgaraPrj1 | nova | 'compute-01.cloud.pd.infn.it', ' compute-02.cloud.pd.infn.it' | 'availability_zone=nova', 'filter_tenant_id=ee1865a76440481cbcff08544c7d580a', 'size=normal' | 675f6291-6997-470d-87e1-e9ea199a379f | +----+-----------+-------------------+--------------------------------------------------------------+----------------------------------------------------------------------------------------------+--------------------------------------+ The same compute nodes are shared by other projects (for which specific host-aggregates, as this one, have been created) The other compute node (I have only 3 compute nodes in this small testbed) is targeted to other projects (for which specific host-aggregates exist) This is what I have in nova.conf wrt scheduling filters: enabled_filters = AggregateInstanceExtraSpecsFilter,AggregateMultiTenancyIsolation,RetryFilter,AvailabilityZoneFilter,RamFilter,CoreFilter,AggregateRamFilter,AggregateCo reFilter,DiskFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter If I try to create a VM, I see from the scheduler log [*] that the AggregateMultiTenancyIsolation selects only 2 compute nodes, as expected. But if I then try to migrate the very same VM, it reports that no valid host was found: # nova migrate afaf2a2d-7ff8-4e52-a89a-031ee079a9ba ERROR (BadRequest): No valid host was found. No valid host found for cold migrate (HTTP 400) (Request-ID: req-45b8afd5-9683-40a6-8416-295563e37e34) And according to the scheduler log the problem is with the AggregateMultiTenancyIsolation which returned 0 hosts (while I would have expected one): 2018-05-29 11:12:56.375 19428 INFO nova.scheduler.host_manager [req-45b8afd5-9683-40a6-8416-295563e37e34 9bd03f63fa9d4beb8de31e6c2f2c8d12 56c3f5c047e74a78a714\ 38c4412e6e13 - - -\ ] Host filter ignoring hosts: compute-02.cloud.pd.infn.it 2018-05-29 11:12:56.375 19428 DEBUG nova.filters [req-45b8afd5-9683-40a6-8416-295563e37e34 9bd03f63fa9d4beb8de31e6c2f2c8d12 56c3f5c047e74a78a71438c4412e6e13 -\ - -] Starting wit\ h 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:70 2018-05-29 11:12:56.376 19428 DEBUG nova.filters [req-45b8afd5-9683-40a6-8416-295563e37e34 9bd03f63fa9d4beb8de31e6c2f2c8d12 56c3f5c047e74a78a71438c4412e6e13 -\ - -] Filter Aggre\ gateInstanceExtraSpecsFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:12:56.377 19428 DEBUG nova.scheduler.filters.aggregate_multitenancy_isolation [req-45b8afd5-9683-40a6-8416-295563e37e34 9bd03f63fa9d4beb8de31e6c\ 2f2c8d12 56c3f5c04\ 7e74a78a71438c4412e6e13 - - -] (compute-01.cloud.pd.infn.it, compute-01.cloud.pd.infn.it) ram: 12797MB disk: 48128MB io_ops: 0 instances: 0 fails tenant id on\ aggregate host_pa\ sses /usr/lib/python2.7/site-packages/nova/scheduler/filters/aggregate_multitenancy_isolation.py:50 2018-05-29 11:12:56.378 19428 DEBUG nova.scheduler.filters.aggregate_multitenancy_isolation [req-45b8afd5-9683-40a6-8416-295563e37e34 9bd03f63fa9d4beb8de31e6c\ 2f2c8d12 56c3f5c04\ 7e74a78a71438c4412e6e13 - - -] (compute-03.cloud.pd.infn.it, compute-03.cloud.pd.infn.it) ram: 8701MB disk: -4096MB io_ops: 0 instances: 0 fails tenant id on \ aggregate host_pas\ ses /usr/lib/python2.7/site-packages/nova/scheduler/filters/aggregate_multitenancy_isolation.py:50 2018-05-29 11:12:56.378 19428 INFO nova.filters [req-45b8afd5-9683-40a6-8416-295563e37e34 9bd03f63fa9d4beb8de31e6c2f2c8d12 56c3f5c047e74a78a71438c4412e6e13 - \ - -] Filter Aggreg\ ateMultiTenancyIsolation returned 0 hosts I am confused ... Any hints ? Thanks, Massimo [*] 2018-05-29 11:09:54.328 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter AggregateInstanceExtraSpecsFilter returned 3 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.330 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter AggregateMultiTenancyIsolation returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.332 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter RetryFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.332 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter AvailabilityZoneFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.333 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter RamFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.334 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter CoreFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.334 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter AggregateRamFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.335 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter AggregateCoreFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.335 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter DiskFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.336 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter ComputeFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.337 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter ComputeCapabilitiesFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.338 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter ImagePropertiesFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.339 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter ServerGroupAntiAffinityFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104 2018-05-29 11:09:54.339 19428 DEBUG nova.filters [req-1a838e77-8042-4550-b157-4943445119a2 ab573ba3ea014b778193b6922ffffe6d ee1865a76440481cbcff08544c7d580a -\ - -] Filter ServerGroupAffinityFilter returned 2 host(s) get_filtered_objects /usr/lib/python2.7/site-packages/nova/filters.py:104
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