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No Valid Host From Host Aggregates Resulted in Instance Spawning Failure
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Problem
- Cold Migration for the instance failed as it could not find any valid host for the instance to be deployed on.
- It queried the hosts available within host aggregates, however, since the flavor used for the instance did not match with any of the host aggregate metadata, migration failed.
# less nova-scheduler.log | grep [UUID]INFO nova.filters [req-XYZ [UUID] [PROJECTUUID] - - -] Filtering removed all hosts for the request with instance ID '[UUID]'. Filter results: ['RetryFilter: (start: 8, end: 8)', 'AggregateMultiTenancyIsolation: (start: 8, end: 6)', 'AvailabilityZoneFilter: (start: 6, end: 6)', 'ServerGroupAffinityFilter: (start: 6, end: 6)', 'ServerGroupAntiAffinityFilter: (start: 6, end: 6)', 'AggregateInstanceExtraSpecsFilter: (start: 6, end: 0)']# openstack server show [UUID] --fit-width+-------------------------------------+------------------------------------------------------|Field | Value +-------------------------------------+------------------------------------------------------| OS-DCF:diskConfig | MANUAL | OS-EXT-AZ:availability_zone | nova | OS-EXT-PF9-SRV-RES-INFO:res_info | {u'cfg_disk_gb': 150.0, u'vcpus': 4, u'cfg_memory_mb': 65536, u'cpu_mhz': 1000} || OS-EXT-SRV-ATTR:host | [HOST] | OS-EXT-SRV-ATTR:hypervisor_hostname | [HOSTNAME] | OS-EXT-SRV-ATTR:instance_name | [INSTANCE_NAME] | OS-EXT-STS:fault | {u'message': u'No valid host was found. \n6 hosts failed with error: Can not find a host aggregate | matching instance extra spec requirement', u'code': 500, u'details': u' File| OS-EXT-STS:power_state | Shutdown | OS-EXT-STS:task_state | None | OS-EXT-STS:vm_state | stoppedEnvironment
- Platform9 Managed OpenStack - All Versions
Cause
Host aggregate to match the instance flavor specifications is not present.
xxxxxxxxxx# openstack flavor show SampleFlavor+----------------------------+-----------------------+| Field | Value |+----------------------------+-----------------------+| OS-FLV-DISABLED:disabled | False || OS-FLV-EXT-DATA:ephemeral | 0 || access_project_ids | None || disk | 80 || id | 6 || name | SampleFlavor || os-flavor-access:is_public | True || properties | host='AggregateMatch' || ram | 8192 || rxtx_factor | 1.0 || swap | || vcpus | 4 |+----------------------------+-----------------------+xxxxxxxxxx# openstack aggregate list | grep sampleaggResolution
- Create a host aggregate matching the Instance flavor specifications.
xxxxxxxxxx$ openstack aggregate create sampleagg $ openstack aggregate set --property host='AggregateMatch'$ openstack aggregate add host 1 [HOST ID]- If the flavor properties is not set, it is mandatory to specify one or more key-value pairs that match the key-value pairs on the host aggregates with the scope aggregate_instance_extra_specs. For our case, it is the aggregate_instance_extra_specs: host='AggregateMatch' key-value pair.
- Set the key-value pair using the following command.
xxxxxxxxxx$ openstack flavor set SampleFlavor --property host='AggregateMatch'Additional Information
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