1：给所有的节点都添加一个物理网卡：
2：给添加的网卡进行配置ip
3：测试ip是否正常可以ping通
修改网络配置：
控制节点修改：
增加flat网段类型：net203
[root@controller01 ~]# vim /etc/neutron/plugins/ml2/ml2_conf.ini
配置flat网络对应真实的物理网卡：
[root@controller01 ~]# vim /etc/neutron/plugins/ml2/linuxbridge_agent.ini
重启服务：
[root@controller01 ~]# systemctl restart neutron-server.service neutron-linuxbridge-agent.service
计算节点修改：
[root@compute01 ~]# vim /etc/neutron/plugins/ml2/linuxbridge_agent.ini 
重启服务：
[root@compute01 ~]# systemctl restart neutron-linuxbridge-agent
[root@compute01 ~]# systemctl status neutron-linuxbridge-agent
测试：创建网络：
[root@controller01 ~]# openstack network create --external --share --provider-physical-network net203 --provider-network-type flat net203
[root@controller01 ~]# openstack network list
+--------------------------------------+----------+--------------------------------------+
| ID | Name | Subnets |
+--------------------------------------+----------+--------------------------------------+
| 71a073b3-c2f9-491b-b8d9-2d8b3c544681 | net203 | b7522a79-a0d9-469c-bf87-93d19a638663 |
| b9b0e4bf-ef13-47fb-8608-b0cb49d13010 | provider | fe427e08-7d4f-46ec-bebd-1a2d277fbef2 |
+--------------------------------------+----------+--------------------------------------+
创建子网：
[root@controller01 ~]# openstack subnet create --network net203 --allocation-pool start=10.100.203.100,end=10.100.203.200 --dns-nameserver 114.114.114.114 --gateway 10.100.203.254 --subnet-range 10.100.203.0/24 net203-subnet
[root@controller01 ~]# openstack subnet list
+--------------------------------------+---------------+--------------------------------------+-----------------+
| ID | Name | Network | Subnet |
+--------------------------------------+---------------+--------------------------------------+-----------------+
| b7522a79-a0d9-469c-bf87-93d19a638663 | net203-subnet | 71a073b3-c2f9-491b-b8d9-2d8b3c544681 | 10.100.203.0/24 |
| fe427e08-7d4f-46ec-bebd-1a2d277fbef2 | provider214 | b9b0e4bf-ef13-47fb-8608-b0cb49d13010 | 10.100.214.0/24 |
+--------------------------------------+---------------+--------------------------------------+-----------------+