Comment 13 for bug 1244255

Hi Dazhao,

The reason binding failed in your most recent neutron server log is not that the L2 agent appears dead as before. Instead, its because the L2 agent does not have a mapping for the physical_network 'physnet1'. See the log:

2013-11-05 23:51:55.750 16413 DEBUG neutron.plugins.ml2.managers [-] NT-19C6DA8 Attempting to bind port 51904944-ab70-4cd4-893a-7a78b056523b on host wanghliu-10-7-0-153.sce.cn.ibm.com bind_port /usr/lib/python2.6/site-packages/neutron/plugins/ml2/managers.py:440
2013-11-05 23:51:55.751 16413 DEBUG neutron.plugins.ml2.drivers.mech_agent [-] NT-53163AF Attempting to bind port 51904944-ab70-4cd4-893a-7a78b056523b on network 2b5d5943-f201-4dda-922a-679dcb4aa503 bind_port /usr/lib/python2.6/site-packages/neutron/plugins/ml2/drivers/mech_agent.py:57
2013-11-05 23:51:55.754 16413 DEBUG neutron.plugins.ml2.drivers.mech_agent [-] NT-C9C8378 Checking agent: {'binary': u'neutron-openvswitch-agent', 'description': None, 'admin_state_up': True, 'heartbeat_timestamp': datetime.datetime(2013, 11, 6, 5, 51, 52), 'alive': True, 'topic': u'N/A', 'host': u'wanghliu-10-7-0-153.sce.cn.ibm.com', 'agent_type': u'Open vSwitch agent', 'created_at': datetime.datetime(2013, 11, 4, 5, 29, 54), 'started_at': datetime.datetime(2013, 11, 6, 5, 48, 56), 'id': u'b7045650-d7e4-43cb-b10d-f725877c73e9', 'configurations': {u'tunnel_types': [], u'tunneling_ip': u'', u'bridge_mappings': {}, u'l2_population': False, u'devices': 0}} bind_port /usr/lib/python2.6/site-packages/neutron/plugins/ml2/drivers/mech_agent.py:59

<<<Note that bridge_mappings in the line above is an empty list.>>>

2013-11-05 23:51:55.755 16413 DEBUG neutron.plugins.ml2.drivers.mech_openvswitch [-] NT-9EF951A Checking segment: {'segmentation_id': 1001L, 'physical_network': u'physnet1', 'id': u'b04b63b4-80db-4a22-80db-463ff4262897', 'network_type': u'vlan'} for mappings: {} with tunnel_types: [] check_segment_for_agent /usr/lib/python2.6/site-packages/neutron/plugins/ml2/drivers/mech_openvswitch.py:48

<<<And that network_type is 'vlan' and physical_network is 'physnet1' in the line above, and this is the only network segment available to bind.>>>

2013-11-05 23:51:55.755 16413 WARNING neutron.plugins.ml2.managers [-] NT-C2C97DA Failed to bind port 51904944-ab70-4cd4-893a-7a78b056523b on host wanghliu-10-7-0-153.sce.cn.ibm.com

The port cannot be bound because the L2 agent on the node does not have connectivity to the needed physical network. Most likely, bridge_mappings needs to be properly configured for the L2 agent on the compute node.

If so, I think Armando's tuning did address the issue, although I agree with him that a better liveness algorithm really is needed.