[openstack-dev] [neutron] dns-nameservers order not honored

John Kasperski jckasper at linux.vnet.ibm.com
Tue Jun 23 20:21:50 UTC 2015

Hi Paul,

There is an old bug on this issue:  

If I remember correctly, the root of the problem was the database
definition for the DNS values.

On 06/23/2015 01:48 PM, Paul Ward wrote:
> I haven't dug into the code yet, but from testing via CLI and REST
> API, it appears neutron does not honor the order in which users
> specify their dns-nameservers.  For example, no matter what order I
> specify and for dns-nameservers, they are always
> ordered with the numerically lowest IP first when doing a subnet-show
> (ie, will be first, even if I specified first).  As
> stated above, CLI and REST API behave the same.
> I believe this is a problem because these are passed to activation on
> a deployed VM in the order neutron lists them in the subnet.  A user
> may have a reason they want the numerically higher DNS IP listed
> first, say if they are trying to load balance their DNS servers.  By
> always ordering them numerically, we give them no way to do this.
> So my question is... is this by design or an oversight?  If it's an
> oversight, I'll dig into the code and propose a patch.
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John Kasperski

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