[SR-Users] Using DNS for Service Discovery with Kamailio
Daniel-Constantin Mierla
miconda at gmail.com
Mon Jan 30 17:20:02 CET 2017
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
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users
> mailing list
> sr-users at lists.sip-router.org
> <mailto:sr-users at lists.sip-router.org>
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
> <http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users>
>
>
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
> list
> sr-users at lists.sip-router.org <mailto:sr-users at lists.sip-router.org>
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
> <http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users>
>
>
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
--
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20170130/1c8e3850/attachment.html>
More information about the sr-users
mailing list