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[Zengfa Gao <zengfa.gao@xxxxxx>]

Public bug reported:

I have Openstack deployed with DVR support.

I did following to setup my networks

neutron net-create demo-net
netdemoaid=$(neutron net-list | awk '{if($4=="'demo-net'"){print $2;}}')
neutron subnet-create demo-net 10.100.102.0/24 --name demo-subnet
subnetdemoid=$(neutron subnet-list | awk '{if($4=="'demo-subnet'"){print $2;}}')
neutron router-create demo-router
routerdemoid=$(neutron router-list | awk '{if($4=="'demo-router'"){print $2;}}')
exnetid=$(neutron net-list | awk '{if($4=="'ext-net'"){print $2;}}')
neutron router-gateway-set $routerdemoid $exnetid
neutron router-interface-add demo-router $subnetdemoid

root@Linux:/tmp#  neutron l3-agent-list-hosting-router 9182ecba-00ac-42ce-b0d1-801003bb1b14
+--------------------------------------+--------------------------------------------------+----------------+-------+
| id                                   | host                                             | admin_state_up | alive |
+--------------------------------------+--------------------------------------------------+----------------+-------+
| 2d6505ef-e7a5-4672-a040-3a50f764a193 | controller-controller1-25ic4624koca | True           | :-)   |
+--------------------------------------+--------------------------------------------------+----------------+-------+

Then I boot an instance:
nova boot --image cirros --flavor m1.tiny --key-name default --nic net-id=$netdemoid cirrosinstance
root@Linux:/tmp#  neutron l3-agent-list-hosting-router 9182ecba-00ac-42ce-b0d1-801003bb1b14
+--------------------------------------+-----------------------------------------------------+----------------+-------+
| id                                   | host                                                | admin_state_up | alive |
+--------------------------------------+-----------------------------------------------------+----------------+-------+
| 2d6505ef-e7a5-4672-a040-3a50f764a193 | controller-controller1-25ic4624koca    | True           | :-)   |
| 339eb96b-9c9d-400a-a45f-e0f2ed6ebf2e | controller-controller0-tqqqqwwogbnv    | True           | :-)   |
| 6b1cc42d-f701-47ba-a0fc-661fb3bc22ae | novacompute2-novacompute2-b4jb7jtppnas | True           | :-)   |
| fdffb433-b5f6-4d10-bdc4-2030a9800b2a | controller-controller2-7piq4lqrgtma    | True           | :-)   |
+--------------------------------------+-----------------------------------------------------+----------------+-------+

We have qrouter binded to three controllers instead of just one controller.
We have qrouter binded to novacompute2 because we have DVR enabled, and instance is on this compute node.
Look at "ip netns", only have SNAT on controller1
DHCP servers for subnetdemo are running on controller0 and controller2

We only need qrouter bind to one controller, not three controllers.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1411874

Title:
  DVR router is seen on multiple controller nodes

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  I have Openstack deployed with DVR support.

  I did following to setup my networks

  neutron net-create demo-net
  netdemoaid=$(neutron net-list | awk '{if($4=="'demo-net'"){print $2;}}')
  neutron subnet-create demo-net 10.100.102.0/24 --name demo-subnet
  subnetdemoid=$(neutron subnet-list | awk '{if($4=="'demo-subnet'"){print $2;}}')
  neutron router-create demo-router
  routerdemoid=$(neutron router-list | awk '{if($4=="'demo-router'"){print $2;}}')
  exnetid=$(neutron net-list | awk '{if($4=="'ext-net'"){print $2;}}')
  neutron router-gateway-set $routerdemoid $exnetid
  neutron router-interface-add demo-router $subnetdemoid

  root@Linux:/tmp#  neutron l3-agent-list-hosting-router 9182ecba-00ac-42ce-b0d1-801003bb1b14
  +--------------------------------------+--------------------------------------------------+----------------+-------+
  | id                                   | host                                             | admin_state_up | alive |
  +--------------------------------------+--------------------------------------------------+----------------+-------+
  | 2d6505ef-e7a5-4672-a040-3a50f764a193 | controller-controller1-25ic4624koca | True           | :-)   |
  +--------------------------------------+--------------------------------------------------+----------------+-------+

  Then I boot an instance:
  nova boot --image cirros --flavor m1.tiny --key-name default --nic net-id=$netdemoid cirrosinstance
  root@Linux:/tmp#  neutron l3-agent-list-hosting-router 9182ecba-00ac-42ce-b0d1-801003bb1b14
  +--------------------------------------+-----------------------------------------------------+----------------+-------+
  | id                                   | host                                                | admin_state_up | alive |
  +--------------------------------------+-----------------------------------------------------+----------------+-------+
  | 2d6505ef-e7a5-4672-a040-3a50f764a193 | controller-controller1-25ic4624koca    | True           | :-)   |
  | 339eb96b-9c9d-400a-a45f-e0f2ed6ebf2e | controller-controller0-tqqqqwwogbnv    | True           | :-)   |
  | 6b1cc42d-f701-47ba-a0fc-661fb3bc22ae | novacompute2-novacompute2-b4jb7jtppnas | True           | :-)   |
  | fdffb433-b5f6-4d10-bdc4-2030a9800b2a | controller-controller2-7piq4lqrgtma    | True           | :-)   |
  +--------------------------------------+-----------------------------------------------------+----------------+-------+

  We have qrouter binded to three controllers instead of just one controller.
  We have qrouter binded to novacompute2 because we have DVR enabled, and instance is on this compute node.
  Look at "ip netns", only have SNAT on controller1
  DHCP servers for subnetdemo are running on controller0 and controller2

  We only need qrouter bind to one controller, not three controllers.

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