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[Nam <namnh@xxxxxxxxxxxxxx>]

Public bug reported:

I had three controllers, I found a bug. I can create two dns-nameserver
on one subnet by I run two commands update dns-nameserver parameter AT
THE SAME TIME

How to reproduce:

Topology: http://codepad.org/ff0debPB

Step1: Create one subnet with dns-nameserver is 8.8.8.8

$ neutron subnet-create --name sub-int-net --dns-nameserver 8.8.8.8 int-
net 172.16.69.0/24

Step 2: Update dns-nameserver parameter of "sub-int-net" 
Please running commands AT THE SAME TIME

- On Controller1
$ neutron subnet-update --dns-nameserver 172.1.1.10 sub-int-net

- On Controller2
$ neutron subnet-update --dns-nameserver 172.1.1.20 sub-int-net

The result:

- Before update:
$ neutron subnet-show sub-int-net
This is the result: http://codepad.org/QLRnNebj

- After update
$ neutron subnet-show sub-int-net
This is the result: http://codepad.org/y94cKrGV
(Please note line 7&8)

Check in database:
This is the result: http://codepad.org/tOoWGVs8

In originally, When we update dns-nameserver parameter, the system will remove the existing dns-nameserver and write a new dns-nameserver, which have value in command update 
That mean: after update this subnet has only one dns-nameserver.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1548142

Title:
  Created two dns-nameservers on one subnet by running two commands
  update "dns-nameserver" parameter in case of neutron server active-
  active

Status in neutron:
  New

Bug description:
  I had three controllers, I found a bug. I can create two dns-
  nameserver on one subnet by I run two commands update dns-nameserver
  parameter AT THE SAME TIME

  How to reproduce:

  Topology: http://codepad.org/ff0debPB

  Step1: Create one subnet with dns-nameserver is 8.8.8.8

  $ neutron subnet-create --name sub-int-net --dns-nameserver 8.8.8.8
  int-net 172.16.69.0/24

  Step 2: Update dns-nameserver parameter of "sub-int-net" 
  Please running commands AT THE SAME TIME

  - On Controller1
  $ neutron subnet-update --dns-nameserver 172.1.1.10 sub-int-net

  - On Controller2
  $ neutron subnet-update --dns-nameserver 172.1.1.20 sub-int-net

  The result:

  - Before update:
  $ neutron subnet-show sub-int-net
  This is the result: http://codepad.org/QLRnNebj

  - After update
  $ neutron subnet-show sub-int-net
  This is the result: http://codepad.org/y94cKrGV
  (Please note line 7&8)

  Check in database:
  This is the result: http://codepad.org/tOoWGVs8

  In originally, When we update dns-nameserver parameter, the system will remove the existing dns-nameserver and write a new dns-nameserver, which have value in command update 
  That mean: after update this subnet has only one dns-nameserver.

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