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

[James Stevens]

I believe people have used a custom back-end to PowerDNS to run their 
specialist DNS service. Although sounds like Casey has already got that 
bit done?


James

On 15/03/2019 08:55, bert hubert wrote:
> On Thu, Mar 14, 2019 at 07:41:52PM -0600, Casey Deccio wrote:
> 
>> 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.
> 
> Hi Casey,
> 
> dnsdist will do what you want, but it appears we have made our documentation
> very hard to use. All through best intentions I hasten to add. Or I can't
> find the right page, but if I can't find it it is still a problem.
> 
> What you would do in this case is create two servers,
> 
> newServer({address="127.0.0.1:5301", name="special1", pool="special"})
> newServer({address="127.0.0.1:53", name="bind"})
> 
> 
> By default all traffic goes to "bind", as it is in the default pool.
> 
> You then do:
> 
> addAction("yourspecialdomain.com", PoolAction("special"))
> 
> This will in fact match everything within yourspecialdomain.com. It will not
> match 123yourspecialdomain.com. If you have to match thousands or millions
> of domain names we have dedicated ways to do that.
> 
>> 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.
> 
> 
> This is an example:
> whoami.lua     IN LUA TXT  "who:toString()"
> 
> To use actual Lua, start the record with ";" and then Lua away based on the
> 'who'.
> 
> https://blog.powerdns.com/2017/12/15/powerdns-authoritative-lua-records/
> https://doc.powerdns.com/authoritative/lua-records/index.html
> 
> Good luck!
> 
> 	Bert
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