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[Bug 1218629] Re: dns order should be honored

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Thu, 03 Sep 2015 19:09:28 -0000
Reply-to: Bug 1218629 <1218629@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Changed in: neutron
       Status: Fix Committed => Fix Released

** Changed in: neutron
    Milestone: None => liberty-3

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https://bugs.launchpad.net/bugs/1218629

Title:
  dns order should be honored

Status in neutron:
  Fix Released

Bug description:
  When a subnet is created with more than one DNS the order they were
  specified is not retained.

  One reason this is an issue is that the user wants to split the DNS
  usage evenly across the available DNS nameservers to lessen the
  probability of the DNS lookups causing a performance bottleneck.

  
  Here's the commands to recreate:

  [root@rhel62 neutron]# neutron net-create mynet
  Created a new network:
  +---------------------------+--------------------------------------+
  | Field                     | Value                                |
  +---------------------------+--------------------------------------+
  | admin_state_up            | True                                 |
  | id                        | 4844005a-88b5-4c33-91de-3a116b2aea97 |
  | name                      | mynet                                |
  | provider:network_type     | local                                |
  | provider:physical_network |                                      |
  | provider:segmentation_id  |                                      |
  | shared                    | False                                |
  | status                    | ACTIVE                               |
  | subnets                   |                                      |
  | tenant_id                 | 1018bf40fe164937956983bf78b3288d     |
  +---------------------------+--------------------------------------+

  [root@rhel62 neutron]# neutron subnet-create --dns-nameserver 192.168.8.1 --dns-nameserver 192.168.1.1 mynet 192.168.1.0/24
  Created a new subnet:
  +------------------+--------------------------------------------------+
  | Field            | Value                                            |
  +------------------+--------------------------------------------------+
  | allocation_pools | {"start": "192.168.1.2", "end": "192.168.1.254"} |
  | cidr             | 192.168.1.0/24                                   |
  | dns_nameservers  | 192.168.1.1                                      |
  |                  | 192.168.8.1                                      |
  | enable_dhcp      | True                                             |
  | gateway_ip       | 192.168.1.1                                      |
  | host_routes      |                                                  |
  | id               | 4448954b-d676-451b-a34c-4e76c8616397             |
  | ip_version       | 4                                                |
  | name             |                                                  |
  | network_id       | 4844005a-88b5-4c33-91de-3a116b2aea97             |
  | tenant_id        | 1018bf40fe164937956983bf78b3288d                 |
  +------------------+--------------------------------------------------+

  [root@rhel62 neutron]# neutron subnet-show 4448954b-d676-451b-a34c-4e76c8616397
  +------------------+--------------------------------------------------+
  | Field            | Value                                            |
  +------------------+--------------------------------------------------+
  | allocation_pools | {"start": "192.168.1.2", "end": "192.168.1.254"} |
  | cidr             | 192.168.1.0/24                                   |
  | dns_nameservers  | 192.168.1.1                                      |
  |                  | 192.168.8.1                                      |
  | enable_dhcp      | True                                             |
  | gateway_ip       | 192.168.1.1                                      |
  | host_routes      |                                                  |
  | id               | 4448954b-d676-451b-a34c-4e76c8616397             |
  | ip_version       | 4                                                |
  | name             |                                                  |
  | network_id       | 4844005a-88b5-4c33-91de-3a116b2aea97             |
  | tenant_id        | 1018bf40fe164937956983bf78b3288d                 |
  +------------------+--------------------------------------------------+

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