Error: No valid host was found

[akshay196]

Any attempt of launch an instance throws this error-
Error: Failed to perform requested operation on instance "CentOS8", the instance has an error status: Please try again later [Error: No valid host was found. There are not enough hosts available.].

nova-compute.log

2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager [req-b0a742c0-a8ee-4168-b577-57feaf172a47 7b2c83e227114267a24c1456a9cc70d6 ee5426bc52724d169ffa102a051c8576 - - -] Instance failed network setup after 1 attempt(s)
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager Traceback (most recent call last):
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1403, in _allocate_network_async
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager     bind_host_id=bind_host_id)
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 886, in allocate_for_instance
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager     bind_host_id, dhcp_options, available_macs)
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 1005, in _update_ports_for_instance
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager     vif.destroy()
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager     self.force_reraise()
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager     six.reraise(self.type_, self.value, self.tb)
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 975, in _update_ports_for_instance
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager     port_client, instance, port_id, port_req_body)
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 442, in _update_port
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager     _ensure_no_port_binding_failure(port)
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 190, in _ensure_no_port_binding_failure
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager     raise exception.PortBindingFailed(port_id=port['id'])
2017-12-08 20:16:35.991 2578 ERROR nova.compute.manager PortBindingFailed: Binding failed for port 3a75dd4f-6bcf-42cc-8c7c-2fded1aae78e, please check neutron logs for more information.

2017-12-08 20:16:37.232 2578 ERROR nova.compute.manager [req-b0a742c0-a8ee-4168-b577-57feaf172a47 7b2c83e227114267a24c1456a9cc70d6 ee5426bc52724d169ff
a102a051c8576 - - -] [instance: 39d73eb1-05a0-4706-8ead-d388ba01664b] Instance failed to spawn

neutron/server.log

2017-12-08 20:16:34.900 5102 ERROR neutron.plugins.ml2.managers [req-1d057f7d-7489-48d4-9784-29f3b86a97cd 8c22382090ab46fb9fad2b189a74c1ec 66560c84789740a6b31d916bad19293b - - -] Failed to bind port 3a75dd4f-6bcf-42cc-8c7c-2fded1aae78e on host localhost.localdomain for vnic_type normal using segments [{'segmentation_id': 91, 'physical_network': None, 'id': u'ee198ecc-3734-4f39-b9d0-4424d3f07c59', 'network_type': u'vxlan'}]
2017-12-08 20:16:34.901 5102 INFO neutron.plugins.ml2.plugin [req-1d057f7d-7489-48d4-9784-29f3b86a97cd 8c22382090ab46fb9fad2b189a74c1ec 66560c84789740a6b31d916bad19293b - - -] Attempt 10 to bind port 3a75dd4f-6bcf-42cc-8c7c-2fded1aae78e
2017-12-08 20:16:34.912 5102 WARNING neutron.plugins.ml2.drivers.mech_agent [req-1d057f7d-7489-48d4-9784-29f3b86a97cd 8c22382090ab46fb9fad2b189a74c1ec 66560c84789740a6b31d916bad19293b - - -] Refusing to bind port 3a75dd4f-6bcf-42cc-8c7c-2fded1aae78e to dead agent: {'binary': u'neutron-openvswitch-agent', 'description': None, 'admin_state_up': True, 'heartbeat_timestamp': datetime.datetime(2017, 12, 8, 8, 15, 1), 'availability_zone': None, 'alive': False, 'topic': u'N/A', 'host': u'localhost.localdomain', 'agent_type': u'Open vSwitch agent', 'resource_versions': {u'Subnet': u'1.0', u'Network': u'1.0', u'SubPort': u'1.0', u'SecurityGroup': u'1.0', u'SecurityGroupRule': u'1.0', u'Trunk': u'1.1', u'QosPolicy': u'1.4', u'Port': u'1.0'}, 'created_at': datetime.datetime(2017, 12, 8, 7, 51, 1), 'started_at': datetime.datetime(2017, 12, 8, 7, 51, 1), 'id': u'c09df3d2-d1ba-4792-8633-09486bbb6cf8', 'configurations': {u'ovs_hybrid_plug': True, u'in_distributed_mode': False, u'datapath_type': u'system', u'vhostuser_socket_dir': u'/var/run/openvswitch', u'tunneling_ip': u'172.22.26.201', u'arp_responder_enabled': False, u'devices': 0, u'ovs_capabilities': {u'datapath_types': [u'netdev', u'system'], u'iface_types': [u'geneve', u'gre', u'internal', u'ipsec_gre', u'lisp', u'patch', u'stt', u'system', u'tap', u'vxlan']}, u'log_agent_heartbeats': False, u'l2_population': False, u'tunnel_types': [u'vxlan'], u'extensions': [], u'enable_distributed_routing': False, u'bridge_mappings': {u'extnet': u'br-ex'}}}