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[Hardik Italia <hardik.italia@xxxxxx>]

Public bug reported:

Setup:
1)      Multimode setup with 1 controller & 2 compute nodes running linux+KVM.
2)      NFS for shared storage. (instances_path = /opt/stack/data/nova/instances is shared)
 
Steps:
1) Create 2 private networks.
2) Create a DVR router and add an interface to each of the above network.
3) Create 1st VM on private network 1 and on compute node1
4) Create 2nd VM on private network 2 and on compute node 2
5) Migrate VM2 from compute node 2 to compute node 1 (nova live-migrate VM2)
6) Notice that after VM2 migrates to compute node1, router namespace is still there on the compute node 2.


Example:

Before migration: VM11 & VM12 are hosted on the different compute nodes
(CN-1 & CN-2).

stack@CTL:~$ nova show vm11 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host                 | CN-1                                                     |
| OS-EXT-SRV-ATTR:hostname             | vm11                          
                           |
stack@CTL:~$ nova show vm12 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host                 | CN-2                                                     |
| OS-EXT-SRV-ATTR:hostname             | vm12                                                     |


Router namespace is present on both the compute nodes:

stack@CN-1:~$ ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8

stack@CN-2:~$ sudo ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8


After migrating VM12 to CN-1:(Both VMs are now hosted on CN-1)

stack@CTL:~$ nova show vm11 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host                 | CN-1                                                     |
| OS-EXT-SRV-ATTR:hostname             | vm11                                                     |
stack@CTL:~$ nova show vm12 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host                 | CN-1                                                     |
| OS-EXT-SRV-ATTR:hostname             | vm12                                                     |


Router namespace is still present on the compute node2 which is not
hosting any VMs.

stack@CTL:~$ nova list
+--------------------------------------+------+--------+------------+-------------+------------+
| ID                                   | Name | Status | Task State | Power State | Networks   |
+--------------------------------------+------+--------+------------+-------------+------------+
| 0a2f82e0-3edd-47c5-aa24-a29d5b826a55 | vm11 | ACTIVE | -          | Running     | n1=1.1.1.4 |
| 1274d128-c39c-4598-a8f6-d4629a259bbc | vm12 | ACTIVE | -          | Running     | n2=2.2.2.3 |

stack@CN-2:~/devstack$ sudo ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: l3-dvr-backlog

** Tags added: l3-dvr-backlog

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https://bugs.launchpad.net/bugs/1518444

Title:
  DVR: router namespace is not getting removed once all VMs from a
  compute node migrates to other node

Status in neutron:
  New

Bug description:
  Setup:
  1)      Multimode setup with 1 controller & 2 compute nodes running linux+KVM.
  2)      NFS for shared storage. (instances_path = /opt/stack/data/nova/instances is shared)
   
  Steps:
  1) Create 2 private networks.
  2) Create a DVR router and add an interface to each of the above network.
  3) Create 1st VM on private network 1 and on compute node1
  4) Create 2nd VM on private network 2 and on compute node 2
  5) Migrate VM2 from compute node 2 to compute node 1 (nova live-migrate VM2)
  6) Notice that after VM2 migrates to compute node1, router namespace is still there on the compute node 2.

  
  Example:

  Before migration: VM11 & VM12 are hosted on the different compute
  nodes (CN-1 & CN-2).

  stack@CTL:~$ nova show vm11 | grep OS-EXT-SRV-ATTR:host
  | OS-EXT-SRV-ATTR:host                 | CN-1                                                     |
  | OS-EXT-SRV-ATTR:hostname             | vm11                          
                             |
  stack@CTL:~$ nova show vm12 | grep OS-EXT-SRV-ATTR:host
  | OS-EXT-SRV-ATTR:host                 | CN-2                                                     |
  | OS-EXT-SRV-ATTR:hostname             | vm12                                                     |

  
  Router namespace is present on both the compute nodes:

  stack@CN-1:~$ ip netns
  qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8

  stack@CN-2:~$ sudo ip netns
  qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8

  
  After migrating VM12 to CN-1:(Both VMs are now hosted on CN-1)

  stack@CTL:~$ nova show vm11 | grep OS-EXT-SRV-ATTR:host
  | OS-EXT-SRV-ATTR:host                 | CN-1                                                     |
  | OS-EXT-SRV-ATTR:hostname             | vm11                                                     |
  stack@CTL:~$ nova show vm12 | grep OS-EXT-SRV-ATTR:host
  | OS-EXT-SRV-ATTR:host                 | CN-1                                                     |
  | OS-EXT-SRV-ATTR:hostname             | vm12                                                     |


  Router namespace is still present on the compute node2 which is not
  hosting any VMs.

  stack@CTL:~$ nova list
  +--------------------------------------+------+--------+------------+-------------+------------+
  | ID                                   | Name | Status | Task State | Power State | Networks   |
  +--------------------------------------+------+--------+------------+-------------+------------+
  | 0a2f82e0-3edd-47c5-aa24-a29d5b826a55 | vm11 | ACTIVE | -          | Running     | n1=1.1.1.4 |
  | 1274d128-c39c-4598-a8f6-d4629a259bbc | vm12 | ACTIVE | -          | Running     | n2=2.2.2.3 |

  stack@CN-2:~/devstack$ sudo ip netns
  qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8

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