Hello everyone,

I ask this question, to see if someone can help me ...

I have a controller node and a compute node.

The controller node also acts as a network node. I have used the following installation guide, for ubuntu and Pike version.

https://docs.openstack.org/pike/install/

The problem is the following:

When someone performs simulations and in this case auto-scaling with heat 30 instances. After a while in the controller node the neutron-server service reaches almost 100% of CPU usage.

In that case there is a slowdown in the cloud and when launching instances.

To get back down CPU usage I have to restart the neutron-linuxbridge-agent service of the compute node. But before that I see that the following appears in the logs of the compute node.

ERROR neutron.plugins.ml2.drivers.agent._common_agent Traceback (most recent call last):
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/agent/_common_agent.py", line 336, in treat_devices_removed
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent     cfg.CONF.host)
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/rpc.py", line 139, in update_device_down
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent     agent_id=agent_id, host=host)
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/dist-packages/neutron/common/rpc.py", line 162, in call
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent     return self._original_context.call(ctxt, method, **kwargs)
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/client.py", line 169, in call
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent     retry=self.retry)
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/transport.py", line 123, in _send
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent     timeout=timeout, retry=retry)
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 578, in send
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent     retry=retry)
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 569, in _send
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent     raise result
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent RemoteError: Remote error: AgentNotFoundByTypeHost Agent with agent_type=L3 agent and host=urano could not be found
2017-12-30 10:33:38.088 1574 ERROR neutron.plugins.ml2.drivers.agent._common_agent [u'Traceback (most recent call last):\n', u'  File ...