Forwarding to two servers

[Kevin Darcy]

On 8/6/2010 7:28 PM, CLOSE Dave (DAE) wrote:
> Sten Carlsen wrote:
>
>    
>> I believe you could use forwarding to the internal server for each individual name:
>>
>> zone "HOST1" {
>>     type forward;
>>     forwarders{ private.domain.server.IP; };
>> }
>>
>> This should do the trick but not elegant, not easy. I would start hinting to
>> management that changes are needed as this is not manageable in the long term.
>> Think also about adding search domains to the hosts that need these lookups.
>>      
> Well, of course, I've already complained about the lack of domains on
> the PRIV server. But it's a production system already installed at a
> large number of customer sites. Changing it will be a long and difficult
> process. I know what needs to be fixed there but I can't do it myself.
>
> Your suggestion of separate forwarding zones for each PRIV host, while
> not elegant as you say, may be fairly practical. I can script an update
> to named.conf based on the actual hosts present on the PRIV system. I've
> tried that and it works! Thanks for the idea.
>    
If you're going to script this _anyway_, why not create separate master 
zones for all of the PRIV names, as previously suggested?

That way you can still resolve the names even if access/connectivity to 
the PRIV server(s) is temporarily interrupted.

The only downside I can see to that is that if the *values* of the PRIV 
names are very dynamic, you might have to run the script quite 
frequently, which can lead to concurrency/locking issues. Using nsupdate 
to make the actual changes to the zones should alleviate most of those 
issues.

                                                                         
                                             - Kevin