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这篇文章将为大家详细讲解有关创建云主机失败报错Exceeded maximum number of retries怎么办，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
做测试的时候，发现创建云主机失败，点开概况看到 
报错信息上要求检查neutron的日志，查看server.log，看到以下信息：
2017-06-08 17:22:52.103 1434130 ERROR neutron.plugins.ml2.managers [req-1ace1476-a027-4409-90b1-e46c9898d1a4 7a969cf8b5f04efdbe1af5e8ac690698 73948300ef77444cbdcf96fa60e0158f - - -] Failed to bind port f8d9b6f2-b8ba-4351-ba51-28321be3dd85 on host dlw2 for vnic_type normal using segments [{'segmentation_id': 78, 'physical_network': None, 'id': u'e6bc5f71-03c3-4453-bee8-0933096bf682', 'network_type': u'vxlan'}]
2017-06-08 17:22:52.103 1434130 INFO neutron.plugins.ml2.plugin [req-1ace1476-a027-4409-90b1-e46c9898d1a4 7a969cf8b5f04efdbe1af5e8ac690698 73948300ef77444cbdcf96fa60e0158f - - -] Attempt 10 to bind port f8d9b6f2-b8ba-4351-ba51-28321be3dd85
2017-06-08 17:22:52.116 1434130 WARNING neutron.plugins.ml2.drivers.mech_agent [req-1ace1476-a027-4409-90b1-e46c9898d1a4 7a969cf8b5f04efdbe1af5e8ac690698 73948300ef77444cbdcf96fa60e0158f - - -] Refusing to bind port f8d9b6f2-b8ba-4351-ba51-28321be3dd85 to dead agent: {'binary': u'neutron-linuxbridge-agent', 'description': None, 'admin_state_up': True, 'heartbeat_timestamp': datetime.datetime(2017, 6, 8, 8, 48, 20), 'availability_zone': None, 'alive': False, 'topic': u'N/A', 'host': u'dlw2', 'agent_type': u'Linux bridge agent', 'resource_versions': {u'SubPort': u'1.0', u'QosPolicy': u'1.3', u'Trunk': u'1.0'}, 'created_at': datetime.datetime(2017, 6, 2, 9, 1, 38), 'started_at': datetime.datetime(2017, 6, 2, 9, 8, 15), 'id': u'a4c3d014-531f-4f08-aea8-3f2a36e08d43', 'configurations': {u'tunneling_ip': u'172.16.40.2', u'devices': 5, u'interface_mappings': {u'provider': u'eno2'}, u'extensions': [], u'l2_population': True, u'tunnel_types
': [u'vxlan'], u'bridge_mappings': {}}}
2017-06-08 17:22:52.116 1434130 ERROR neutron.plugins.ml2.managers [req-1ace1476-a027-4409-90b1-e46c9898d1a4 7a969cf8b5f04efdbe1af5e8ac690698 73948300ef77444cbdcf96fa60e0158f - - -] Failed to bind port f8d9b6f2-b8ba-4351-ba51-28321be3dd85 on host dlw2 for vnic_type normal using segments [{'segmentation_id': 78, 'physical_network': None, 'id': u'e6bc5f71-03c3-4453-bee8-0933096bf682', 'network_type': u'vxlan'}]看到{u'tunneling_ip': u'172.16.40.2', u'devices'，发现有tunneling_ip,想到了Linux bridge agent服务，于是检查neutron服务
# neutron agent-list |grep Linux | a4c3d014-531f-4f08-aea8-3f2a36e08d43 | Linux bridge agent | dlw2 | | xxx | True | neutron-linuxbridge-agent | | df626dfb-a874-44d6-9ce2-a5e7d8157500 | Linux bridge agent | dlw1 | | xxx | True | neutron-linuxbridge-agent | | e04db880-1e77-4bf6-9321-dea7791d1eaf | Linux bridge agent | dlw3 | | xxx | True | neutron-linuxbridge-agent |
发现三个linuxbridgeagent都是xxx表示down了
[root@dlw1 openrc]# for i in `neutron agent-list |grep Li |awk -F '|' '{print $2}'` ;do neutron agent-show $i ;done
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| admin_state_up | True |
| agent_type | Linux bridge agent |
| alive | False |
| availability_zone | |
| binary | neutron-linuxbridge-agent |
| configurations | { |
| | "tunneling_ip": "172.16.40.2", |
| | "devices": 5, |
| | "interface_mappings": { |
| | "provider": "eno2" |
| | }, |
| | "extensions": [], |
| | "l2_population": true, |
| | "tunnel_types": [ |
| | "vxlan" |
| | ], |
| | "bridge_mappings": {} |
| | } |
| created_at | 2017-06-02 09:01:38 |
| description | |
| heartbeat_timestamp | 2017-06-08 08:48:20 |
| host | dlw2 |
| id | a4c3d014-531f-4f08-aea8-3f2a36e08d43 |
| started_at | 2017-06-02 09:08:15 |
| topic | N/A |
+---------------------+--------------------------------------+
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| admin_state_up | True |
| agent_type | Linux bridge agent |
| alive | False |
| availability_zone | |
| binary | neutron-linuxbridge-agent |
| configurations | { |
| | "tunneling_ip": "172.16.40.1", |
| | "devices": 5, |
| | "interface_mappings": { |
| | "provider": "eno2" |
| | }, |
| | "extensions": [], |
| | "l2_population": true, |
| | "tunnel_types": [ |
| | "vxlan" |
| | ], |
| | "bridge_mappings": {} |
| | } |
| created_at | 2017-06-02 09:01:39 |
| description | |
| heartbeat_timestamp | 2017-06-08 08:46:50 |
| host | dlw1 |
| id | df626dfb-a874-44d6-9ce2-a5e7d8157500 |
| started_at | 2017-06-02 09:08:18 |
| topic | N/A |
+---------------------+--------------------------------------+
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| admin_state_up | True |
| agent_type | Linux bridge agent |
| alive | False |
| availability_zone | |
| binary | neutron-linuxbridge-agent |
| configurations | { |
| | "tunneling_ip": "172.16.40.3", |
| | "devices": 3, |
| | "interface_mappings": { |
| | "provider": "eno2" |
| | }, |
| | "extensions": [], |
| | "l2_population": true, |
| | "tunnel_types": [ |
| | "vxlan" |
| | ], |
| | "bridge_mappings": {} |
| | } |
| created_at | 2017-06-02 09:02:37 |
| description | |
| heartbeat_timestamp | 2017-06-08 08:48:17 |
| host | dlw3 |
| id | e04db880-1e77-4bf6-9321-dea7791d1eaf |
| started_at | 2017-06-02 09:08:11 |
| topic | N/A |
+---------------------+--------------------------------------+可能之前重启neutron相关服务的时候导致linuxbridgeagent服务down了，所以出现以上报错 重启下服务应该就没问题了
# systemctl restart neutron-linuxbridge-agent.service
再重新创建云主机，发现创建成功。
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