neutron agent-list 没有任何输出 AMQP server on controller:5672 is unreachable:

neutron agent-list    没有任何输出

检查 网络节点 /var/log/neutro/dhcp-agent.log  出现错误

 ERROR oslo_messaging._drivers.impl_rabbit [req-6fb9a902-e113-4275-bda4-0d3b3266f3d1 ] AMQP server on controller:5672 is unreachable: [Errno 113] EHOSTUNREACH. Trying again in 2 seconds.

其他地方无异常，配置文档无异常，防火墙都是关着的

根据某大神的指点

启用iptables，在rabbitmq server端加入如下规则，开放rabbitmq端口（5672），允许其他主机访问rabbitmq server：

iptables -I INPUT -p tcp --dport 5672 -j ACCEPT

service iptables save

service iptables restart

再重新执行

[root@controller ~]# neutron agent-list
+--------------------------------------+--------------------+---------+-------+----------------+---------------------------+
| id                                   | agent_type         | host    | alive | admin_state_up | binary                    |
+--------------------------------------+--------------------+---------+-------+----------------+---------------------------+
| 1ac13096-375c-4bcf-8d9d-1179e948b7e7 | DHCP agent         | network | :-)   | True           | neutron-dhcp-agent        |
| 66ce4945-5ae6-4526-bc28-5cac97139ea0 | L3 agent           | network | :-)   | True           | neutron-l3-agent          |
| 6f139eae-2070-42fc-8b53-70107f2ac91c | Open vSwitch agent | network | :-)   | True           | neutron-openvswitch-agent |
| d7a8c7bd-c415-4fe4-a17a-87b035b0b412 | Metadata agent     | network | :-)   | True           | neutron-metadata-agent    |
+--------------------------------------+--------------------+---------+-------+----------------+---------------------------+