[dns-operations] Custom DNS server as backend for authoritative DNS server

Klaus Darilion klaus.mailinglists at pernau.at
Wed Mar 20 18:51:14 UTC 2019


Am 15.03.2019 um 03:52 schrieb Mark E. Jeftovic:
>
> You can do what you want with PowerDNS.
>
> You would specify your backend first, then the normal backend (i.e. 
> bind). Any query that doesn't garner a response from your backend will 
> fall through to the next one.
>
Almost. PowerDNS will query every backend first to find the one with the 
best matching zone.

E.g. first backend has example.com zone. Second backend not, and also no 
more-specific. Then there is an incoming query for www.example.com.

PDNS will ask the first backend for www.example.com. It will receive "no 
zone". Then it will ask for "example.com" --> The backend returns "match"(*)

Now PDNS will ask the second backend for www.example.com. It will 
receive "no zone". Here PowerDNS will break and use the first backend as 
"best match".

regards

Klaus

* if the backend is smart it could return "example.com" on the first 
query for "www.example.com" as best match.

> https://doc.powerdns.com/authoritative/backends/pipe.html
>
> or more recent
>
> https://doc.powerdns.com/authoritative/backends/remote.html
>
> - mark
>
> On 2019-03-14 9:41 PM, Casey Deccio wrote:
>>
>>> On Mar 14, 2019, at 6:15 PM, Mark E. Jeftovic <markjr at easydns.com 
>>> <mailto:markjr at easydns.com>> wrote:
>>>
>>> Off the top of my head, put it behind dnsdist or make it a Powerdns 
>>> backend
>>>
>>
>> Thanks for the ideas.  Earlier today I glanced through the dnsdist 
>> docs and saw some rules for balancing based on IP addresses.  It 
>> wasn't immediately clear how I might determine backend IP (and port?) 
>> based on query name, but someone else suggested off-list that it was 
>> possible.  I suppose I might need to spend some time looking through 
>> the docs and finding some solid examples.
>>
>> I also looked have looked at PowerDNS for specifying a DNS server 
>> backend, but again it wasn't clear to me from reading through the 
>> docs if that was possible.  The BIND backend, for example, seems to 
>> use a BIND configuration file, but doesn't actually query a BIND (or 
>> other server) backend.
>>
>> I also looked at using LUA records, but I'm generating TXT records 
>> based on the query name, and I also wasn't sure if that was possible 
>> with the PowerDNS/LUA, at least it wasn't clear from the examples.
>>
>> Thanks,
>> Casey
>>
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> -- 
> Mark E. Jeftovic <markjr at easydns.com>
> Co-founder & CEO, easyDNS Technologies Inc.
> /Author of Managing Mission Critical Domains & DNS: The Book 
> <https://easydns.com/blog/2018/07/18/new-book-managing-mission-critical-domains-dns/>/
> /Personal Blog: Guerrilla-Capitalism.com 
> <https://guerrilla-capitalism.com>/
>
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