https://docs.openstack.org/neutron/pike/admin/config-dhcp-ha.html
controlnode: neutron server
# neutron.conf
[DEFAULT]
........
dhcp_agents_per_network = 2
NetworkNode
# service neutron-dhcp-agent restart
# neutron dhcp-agent-list-hosting-net <Network_ID>
+--------------------------------------+-----------+----------------+-------+
| id | host | admin_state_up | alive |
+--------------------------------------+-----------+----------------+-------+
| XXXXXXXXc-45ee-947a-e17aada2e970 | Network-13 | True | :-) |
| XXXXXX-b45f-400a-85c0-b729d9ea906a | Netework-11 | True | :-) |
+--------------------------------------+-----------+----------------+-------+
