<div dir="ltr"><div>Hi,</div><div><br></div><div>I'm having some problems concerning auto scaling feature.</div><div>Any ideas?</div><div><br></div><div>First scaling up and down is working just fine. But then when tested later on scaling down/up is no longer working properly. </div>
<div>Scaling down may occur even it shouldn't or scaling up doesn't occur even it should. When in this situation I remove all the </div><div>received metric data from the DB, auto scaling starts to work again.</div>
<div><br></div><div>Ceilometer is configured to use Mongo and the auto scaling is based on the cpu_util metrics.</div><div><br></div><div>Related configurations:</div><div>-----------------------</div><div>/etc/ceilometer/pipeline.yaml on compute nodes:</div>
<div><br></div><div>name: cpu_pipeline</div><div>interval: 15</div><div><br></div><div>/etc/ceilometer/ceilometer.conf on controller:</div><div>evaluation_interval=15</div><div><br></div><div>Heat template used:</div><div>
-------------------</div><div> "Resources" : {</div><div><br></div><div> "Group_A" : {</div><div> "Type" : "AWS::AutoScaling::AutoScalingGroup",</div><div> "Properties" : {</div>
<div> "AvailabilityZones" : { "Fn::GetAZs" : ""},</div><div> "LaunchConfigurationName" : { "Ref" : "Group_A_Config" },</div><div> "MinSize" : "1",</div>
<div> "MaxSize" : "3",</div><div> "Tags" : [ </div><div> { "Key" : "metering.server_group", "Value" : "Group_A" },</div>
<div> { "Key" : "custom_metadata", "Value" : "test" } </div><div> ],</div><div> "VPCZoneIdentifier" : [ { "Ref" : "PrivateSubnetId" } ] <br>
</div><div> }</div><div> },</div><div><br></div><div> "Group_A_Config" : {</div><div> "Type" : "AWS::AutoScaling::LaunchConfiguration",</div><div> "Properties": {</div>
<div> "ImageId" : { "Ref" : "ImageId" },</div><div> "InstanceType" : { "Ref" : "InstanceType" },</div><div> "KeyName" : { "Ref" : "KeyName" }</div>
<div> }</div><div> },</div><div><br></div><div> "ScaleUpPolicy" : {</div><div> "Type" : "AWS::AutoScaling::ScalingPolicy",</div><div> "Properties" : {</div>
<div> "AdjustmentType" : "ChangeInCapacity",</div><div> "AutoScalingGroupName" : { "Ref" : "Group_A" },</div><div> "Cooldown" : "20",</div>
<div> "ScalingAdjustment" : "1"</div><div> }</div><div> },</div><div><br></div><div> "ScaleDownPolicy" : {</div><div> "Type" : "AWS::AutoScaling::ScalingPolicy",</div>
<div> "Properties" : {</div><div> "AdjustmentType" : "ChangeInCapacity",</div><div> "AutoScalingGroupName" : { "Ref" : "Group_A" },</div>
<div> "Cooldown" : "20",</div><div> "ScalingAdjustment" : "-1"</div><div> }</div><div> },</div><div><br></div><div><span class="" style="white-space:pre"> </span>"CPUAlarmHigh": {</div>
<div> "Type": "OS::Ceilometer::Alarm",</div><div> "Properties": {</div><div> "description": "Scale-up if CPU is greater than 90% for 20 seconds",</div>
<div> "meter_name": "cpu_util",</div><div> "statistic": "avg",</div><div> "period": "20",</div><div> "evaluation_periods": "1",</div>
<div> "threshold": "90",</div><div> "alarm_actions":</div><div> [ {"Fn::GetAtt": ["ScaleUpPolicy", "AlarmUrl"]} ],</div>
<div> "matching_metadata":</div><div> {"metadata.user_metadata.server_group": "Group_A" },</div><div> "comparison_operator": "gt"</div>
<div> }</div><div> },</div><div><br></div><div> "CPUAlarmLow": {</div><div> "Type": "OS::Ceilometer::Alarm",</div><div> "Properties": {</div>
<div> "description": "Scale-down if CPU is less than 50% for 20 seconds",</div><div> "meter_name": "cpu_util",</div><div> "statistic": "avg",</div>
<div> "period": "20",</div><div> "evaluation_periods": "1",</div><div> "threshold": "50",</div><div> "alarm_actions":</div>
<div> [ {"Fn::GetAtt": ["ScaleDownPolicy", "AlarmUrl"]} ],</div><div> "matching_metadata":</div><div> {"metadata.user_metadata.server_group": "Group_A" },</div>
<div> "comparison_operator": "lt"</div><div> }</div><div><br></div><div>In ceilometer logs I can see the following kind of warnings:</div><div><br></div><div><44>Feb 24 08:41:08 node-16 ceilometer-ceilometer.collector.dispatcher.database WARNING: message signature invalid, discarding message: {u'counter_name': u'instance.scheduled', u'user_id': None, u'message_signature': u'd1b49ddf004edc5b7a8dc9405b42a71f2ae975d04c25838c3dc0ea0e6f6e4edd', u'timestamp': u'2014-02-24 08:41:08.334580', u'resource_id': u'48c815ab-01c9-4ac8-9096-ac171976598c', u'message_id': u'67e611e4-9d2f-11e3-81f1-080027e519cb', u'source': u'openstack', u'counter_unit': u'instance', u'counter_volume': 1, u'project_id': u'efcca4ba425c4beda73eb31a54df931a', u'resource_metadata': {u'instance_id': u'48c815ab-01c9-4ac8-9096-ac171976598c', u'weighted_host': {u'host': u'node-18', u'weight': 3818.0}, u'host': u'scheduler.node-16', u'request_spec': {u'num_instances': 1, u'block_device_mapping': [{u'instance_uuid': u'48c815ab-01c9-4ac8-9096-ac171976598c', u'guest_format': None, u'boot_index': 0, u'delete_on_termination': True, u'no_device': None, u'connection_info': None, u'volume_id': None, u'device_name': None, u'disk_bus': None, u'image_id': u'11848cbf-a428-4dfb-8818-2f0a981f540b', u'source_type': u'image', u'device_type': u'disk', u'snapshot_id': None, u'destination_type': u'local', u'volume_size': None}], u'image': {u'status': u'active', u'name': u'cirrosImg', u'deleted': False, u'container_format': u'bare', u'created_at': u'2014-02-12T08:46:04.000000', u'disk_format': u'qcow2', u'updated_at': u'2014-02-12T08:46:04.000000', u'properties': {}, u'min_disk': 0, u'min_ram': 0, u'checksum': u'50bdc35edb03a38d91b1b071afb20a3c', u'owner': u'efcca4ba425c4beda73eb31a54df931a', u'is_public': True, u'deleted_at': None, u'id': u'11848cbf-a428-4dfb-8818-2f0a981f540b', u'size': 9761280}, u'instance_type': {u'root_gb': 1, u'name': u'm1.tiny', u'ephemeral_gb': 0, u'memory_mb': 512, u'vcpus': 1, u'extra_specs': {}, u'swap': 0, u'rxtx_factor': 1.0, u'flavorid': u'1', u'vcpu_weight': None, u'id': 2}, u'instance_properties': {u'vm_state': u'building', u'availability_zone': None, u'terminated_at': None, u'ephemeral_gb': 0, u'instance_type_id': 2, u'user_data': u'Q29udGVudC1UeXBlOiBtdWx0aXBhcnQvbWl4ZWQ7IGJvdW5kYXJ5PSI9PT0</div>
<div>...</div><div>, u'cleaned': False, u'vm_mode': None, u'deleted_at': None, u'reservation_id': u'r-l91mh33v', u'id': 274, u'security_groups': {u'objects': []}, u'disable_terminate': False, u'root_device_name': None, u'display_name': u'tyky-Group_A-55cklit7nvbq-Group_A-2-yis32na5m7ey', u'uuid': u'48c815ab-01c9-4ac8-9096-ac171976598c', u'default_swap_device': None, u'info_cache': {u'instance_uuid': u'48c815ab-01c9-4ac8-9096-ac171976598c', u'network_info': []}, u'hostname': u'tyky-group-a-55cklit7nvbq-group-a-2-yis32na5m7ey', u'launched_on': None, u'display_description': u'tyky-Group_A-55cklit7nvbq-Group_A-2-yis32na5m7ey', u'key_data': u'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC39hmz8e40Xv/+QKkLyRA7j02RfIG61cr1j41RftnkOF3ZbwBzi7qibsOA3gC9Ln05YbB6z2/iUnQzxQsoOpmlnXuv2O296utY2ZCTKhdFSzn2Ot7l635zEXkivMc97wz4bITtaBTjX3nV6sXOfevdTIOJeC11SqxmfNRRzXcz9fRv6kLjz7IrA0tvRTp2xDVtFEj+vFLWaXc3TcUSygxiSLeAuNkH1rZ9jVuHXXvzb/e7navrGyJec2P86AQg2TUk77MhLjPcbyKiJJK0DhK6zOkZUWXtgIVQx7+gO/Xs2QgQHcw+VdzRzpJK+/EOzUOU8IDWNnyfaJEnQEoX2oMj Generated by Nova\n', u'deleted': False, u'config_drive': u'', u'power_state': 0, u'default_ephemeral_device': None, u'progress': 0, u'project_id': u'efcca4ba425c4beda73eb31a54df931a', u'launched_at': None, u'scheduled_at': None, u'node': None, u'ramdisk_id': u'', u'access_ip_v6': None, u'access_ip_v4': None, u'kernel_id': u'', u'key_name': u'heat_key', u'updated_at': None, u'host': None, u'user_id': u'ef4e983291ef4ad1b88eb1f776bd52b6', u'system_metadata': {u'instance_type_memory_mb': 512, u'instance_type_swap': 0, u'instance_type_vcpu_weight': None, u'instance_type_root_gb': 1, u'instance_type_name': u'm1.tiny', u'instance_type_id': 2, u'instance_type_ephemeral_gb': 0, u'instance_type_rxtx_factor': 1.0, u'image_disk_format': u'qcow2', u'instance_type_flavorid': u'1', u'instance_type_vcpus': 1, u'image_container_format': u'bare', u'image_min_ram': 0, u'image_min_disk': 1, u'image_base_image_ref': u'11848cbf-a428-4dfb-8818-2f0a981f540b'}, u'task_state': u'scheduling', u'shutdown_terminate': False, u'cell_name': None, u'root_gb': 1, u'locked': False, u'name': u'instance-00000112', u'created_at': u'2014-02-24T08:41:08.257534', u'locked_by': None, u'launch_index': 0, u'memory_mb': 512, u'vcpus': 1, u'image_ref': u'11848cbf-a428-4dfb-8818-2f0a981f540b', u'architecture': None, u'auto_disk_config': False, u'os_type': None, u'metadata': {u'metering.server_group': u'Group_A', u'AutoScalingGroupName': u'tyky-Group_A-55cklit7nvbq', u'custom_metadata': u'test'}}, u'security_group': [u'default'], u'instance_uuids': [u'48c815ab-01c9-4ac8-9096-ac171976598c']}, u'event_type': u'scheduler.run_instance.scheduled'}, u'counter_type': u'delta'}</div>
<div><br></div><div>Also the following warnings/errors can be seen but they seem to occur when auto scaling is properly working and have no negative effects as such:</div><div><br></div><div><44>Feb 24 08:43:08 node-16 <U+FEFF>ceilometer-ceilometer.transformer.conversions WARNING: dropping sample with no predecessor: <ceilometer.sample.Sample object at 0x3774fd0></div>
<div><44>Feb 24 08:43:08 node-16 ceilometer-ceilometer.publisher.rpc AUDIT: Publishing 1 samples on metering</div><div><44>Feb 24 08:43:08 node-16 ceilometer-ceilometer.publisher.rpc AUDIT: Publishing 1 samples on metering</div>
<div><44>Feb 24 08:43:08 node-16 ceilometer-ceilometer.publisher.rpc AUDIT: Publishing 1 samples on metering</div><div><44>Feb 24 08:43:08 node-16 ceilometer-ceilometer.publisher.rpc AUDIT: Publishing 1 samples on metering</div>
<div><44>Feb 24 08:43:08 node-16 ceilometer-ceilometer.publisher.rpc AUDIT: Publishing 1 samples on metering</div><div><44>Feb 24 08:43:08 node-16 ceilometer-ceilometer.publisher.rpc AUDIT: Publishing 1 samples on metering</div>
<div><44>Feb 24 08:43:09 node-16 ceilometer-ceilometer.publisher.rpc AUDIT: Publishing 1 samples on metering</div><div><43>Feb 24 08:43:09 node-16 ceilometer-ceilometer.collector.dispatcher.database ERROR: Failed to record metering data: not okForStor</div>
<div>age</div><div>Traceback (most recent call last):</div><div> File "/usr/lib/python2.7/dist-packages/ceilometer/collector/dispatcher/database.py", line 65, in record_metering_data</div><div> self.storage_conn.record_metering_data(meter)</div>
<div> File "/usr/lib/python2.7/dist-packages/ceilometer/storage/impl_mongodb.py", line 417, in record_metering_data</div><div> upsert=True,</div><div> File "/usr/lib/python2.7/dist-packages/pymongo/collection.py", line 487, in update</div>
<div> check_keys, self.__uuid_subtype), safe)</div><div> File "/usr/lib/python2.7/dist-packages/pymongo/mongo_client.py", line 969, in _send_message</div><div> rv = self.__check_response_to_last_error(response)</div>
<div> File "/usr/lib/python2.7/dist-packages/pymongo/mongo_client.py", line 911, in __check_response_to_last_error</div><div> raise OperationFailure(details["err"], details["code"])</div>
<div>OperationFailure: not okForStorage</div><div><br></div><div>Br,</div><div>-Juha</div></div>