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[KaiLin <linkai3@xxxxxxxxxx>]

Public bug reported:

SYMPTOM:
1.neutron dhcp-agent-network-remove [dhcp agent of network Node1] [network]
2.neutron dhcp-agent-network-add [dhcp agent of network Node2] [network]
3.neutron port-show [dhcp-port]
Then the status of dhcp port change to BUILD, and this will cause the dhcp server and the metadata server can't work normally. 

CAUSE:
First I find the binding:host_id of dhcp port doesn't change to the new host_id after dhcp-agent-network-add.
Then I check the code, I find it the status of port change to BUILD in the devices_details_list = self.plugin_rpc.get_devices_details_list in ovs_neutron_agent.py.
And it should change the status of port to ACTIVE in update_device_up,but in the update_device_up we can see:
	if (host and not plugin.port_bound_to_host(rpc_context,
                                                   port_id, host)):
            LOG.debug(_("Device %(device)s not bound to the"
                        " agent host %(host)s"),
                      {'device': device, 'host': host})
            return
We can see this,it return directly because the port didn't bind to the new host, so cause the problem.

FIX:
I think we should update the binding:host_id of dhcp port to the new host.

** Affects: neutron
     Importance: Undecided
     Assignee: KaiLin (linkai3)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => KaiLin (linkai3)

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https://bugs.launchpad.net/bugs/1410067

Title:
  Add network to new dhcp agent cause the dhcp port status to be BUILD

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  SYMPTOM:
  1.neutron dhcp-agent-network-remove [dhcp agent of network Node1] [network]
  2.neutron dhcp-agent-network-add [dhcp agent of network Node2] [network]
  3.neutron port-show [dhcp-port]
  Then the status of dhcp port change to BUILD, and this will cause the dhcp server and the metadata server can't work normally. 

  CAUSE:
  First I find the binding:host_id of dhcp port doesn't change to the new host_id after dhcp-agent-network-add.
  Then I check the code, I find it the status of port change to BUILD in the devices_details_list = self.plugin_rpc.get_devices_details_list in ovs_neutron_agent.py.
  And it should change the status of port to ACTIVE in update_device_up,but in the update_device_up we can see:
  	if (host and not plugin.port_bound_to_host(rpc_context,
                                                     port_id, host)):
              LOG.debug(_("Device %(device)s not bound to the"
                          " agent host %(host)s"),
                        {'device': device, 'host': host})
              return
  We can see this,it return directly because the port didn't bind to the new host, so cause the problem.

  FIX:
  I think we should update the binding:host_id of dhcp port to the new host.

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