[SR-Users] Using DNS for Service Discovery with Kamailio
Daniel-Constantin Mierla
miconda at gmail.com
Tue Jan 31 12:47:21 CET 2017
Hello,
someone published a npm package for etcd-based discovery service, which
sounds similar to what you want to do:
-
https://www.kamailio.org/w/2015/10/kamailio-dispatcher-discovery-service-with-nodejs-and-etcd/
Alternative to dispatcher, you can also consider using rtjson module to
push back destinations to kamailio in a json document via some API service.
But if you want to watch the state of destinations, then dispatcher is
the way to go.
Cheers,
Daniel
On 31/01/2017 11:28, Casco, Alessio wrote:
> Hello Daniel!
>
> My goal is the following: I would like to use a service discovery
> application (consul is an example) that dynamically guides the
> kamailio back-ends. As soon as a new back-end registers into the
> discovery service, kamailio will start sending traffic to it.
>
> Since writing a module is not an option right now, I though about
> using DNS and SRV records to achieve the same result, doing so I will
> be able to instruct kamailio dynamically, the idea of the dispatcher
> group, came in my mind only because I'd like to have something outside
> the main kamailio config, so in the case I have to change the name or
> do some adjustments, I don't have to restart the entire kamailio but
> use a RPC command for example.
>
> Thanks
> Alessio
>
> On Mon, Jan 30, 2017 at 4:20 PM, Daniel-Constantin Mierla
> <miconda at gmail.com <mailto:miconda at gmail.com>> wrote:
>
> Hello,
>
> if you expect that dispatcher module will list the associated ip
> addresses with the hostname after a DNS SRV lookup, then this is
> not available.
>
> Dispatcher module will still use the single hostname to set r-uri
> (or dst uri) and then TM module does the lookup before sending,
> inside t_relay(). Also, irc, the keepalive is sent only to the
> first ip resolved for a hostname.
>
> If you want to relay on DNS SRV for loadbalancing, you don't need
> dispatcher at all, everything is done transparently for
> configuration file by tm and core.
>
> Maybe you can detail a bit more what you want to achieve with
> dispatcher on this topic and we can think of alternatives,
>
> Cheers,
> Daniel
>
>
> On 26/01/2017 11:34, Casco, Alessio wrote:
>> Thanks for your help,
>>
>> Unfortunately with kamailio 4.4.4, dispatcher module and your
>> suggestions, I still don't see the SRV record picked up (at least
>> using the kamcmd dispatcher.list command).
>>
>> I didn't try the LCR module yet, I want to be sure first that
>> dispatcher is not able to handle SRV first
>>
>> Thanks
>> Alessio
>>
>> On Wed, Jan 25, 2017 at 8:06 PM, Jeremy Gadd
>> <jeremygadd at gmail.com <mailto:jeremygadd at gmail.com>> wrote:
>>
>> Holy cow, sorry about that!
>>
>> Put the hostname in dispatcher (no port or _sip._udp) and
>> enable these:
>>
>> use_dns_cache=on
>> use_dns_failover=on
>> dns_srv_lb=on
>>
>> That's how I got it working (using the LCR module).
>>
>> On Wed, Jan 25, 2017 at 1:05 PM, Jeremy Gadd
>> <jeremygadd at gmail.com <mailto:jeremygadd at gmail.com>> wrote:
>>
>> Put the hostname in dispatcher (no port) and enable these:
>>
>>
>> On Wed, Jan 25, 2017 at 9:30 AM, Casco, Alessio
>> <alessio.casco at nexmo.com
>> <mailto:alessio.casco at nexmo.com>> wrote:
>>
>> Hello Guys!
>>
>> I'd like to be able to use SRV records inside
>> dispatcher groups, so I can automatise the discovery
>> of new backends on my network using DNS
>>
>> I've tried with the following formats into the
>> dispatcher.list file:
>>
>> $group _sip._udp.sip-voice_backends
>> $group sip-voice_backends
>>
>> and none looks to be working, running
>> the kamailio_ctl dispatcher.list won't show me the
>> group set with SRV records. ( I also try NAPTR
>> records, with no luck as well.)
>>
>> * Does the dispatcher module support SRV or NAPTR
>> records? (maybe my format is not correct)
>> * If not, do you have any other idea on what I could
>> do to achieve what I'd like to do?
>>
>> Thanks
>> Alessio
>>
>>
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>
> --
> Daniel-Constantin Mierla
> www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
> Kamailio Advanced Training - Mar 6-8 (Europe) and Mar 20-22 (USA) - www.asipto.com <http://www.asipto.com>
> Kamailio World Conference - May 8-10, 2017 - www.kamailioworld.com <http://www.kamailioworld.com>
>
--
Daniel-Constantin Mierla
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - Mar 6-8 (Europe) and Mar 20-22 (USA) - www.asipto.com
Kamailio World Conference - May 8-10, 2017 - www.kamailioworld.com
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