OpenStack创建连接时提示[Errno 111] Connection refused的解决方法

问题现象描述

执行openstack network agent list命令时，提示如下信息：

Unable to establish connection to http://controller:9696/v2.0/agents: HTTPConnectionPool(host='controller', port=9696): Max retries exceeded with url: /v2.0/agents (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0xffffb2bf5710>: Failed to establish a new connection: [Errno 111] Connection refused',))

关键过程、根本原因分析

token过期或者不可用，需要重新获取token。

结论、解决方案及效果

1. 重新获取token。

   openstack token issue

2. 重启关于Neutron的所有服务。

   systemctl restart neutron-server.service \
   neutron-linuxbridge-agent.service neutron-dhcp-agent.service \
   neutron-metadata-agent.service