[SR-Users] Kamailio Active / Active HA.

[Ben Langfeld]

Good point. Mobicents is on my list of projects to which I'm due to
contribute something. I'll get on it shortly.

On 29 December 2014 at 11:26, Carsten Bock <carsten at ng-voice.com> wrote:

> Hi Ben,
>
> that's absolutely for sure! It took us ~2 years to get the DNS-SRV
> implementation of major DSL-Modem-Manufacturer right ;-)
> Nevertheless, it's the way to go for redundancy. And since Mobicents
> is open-source, we can probably simply provide a patch to fix it :-)
>
> Kind regards,
> Carsten
>
> 2014-12-29 12:13 GMT+01:00 Ben Langfeld <ben at langfeld.co.uk>:
> > On 27 December 2014 at 23:44, Carsten Bock <carsten at ng-voice.com> wrote:
> >>
> >> Hi Mahmoud,
> >>
> >> Thy typical way, to build a Active/Active setup is by using DNS-SRV
> >> records. The two servers get different IPs and you announce both IPs
> >> using DNS to the devices. Most common User-Agents support this
> >> nowadays, so that's kind of easy. It is specified in RFC3263:
> >> "Locating SIP-Servers" (http://tools.ietf.org/html/rfc3263).
> >>
> >> However, when using DNS-SRV records, dialogs and transactions are
> >> still associated with a single server, even though the User-Agent has
> >> an Alternative, in case one server fails. If you want to increase the
> >> HA for this, you can advertise the Domain name instead of an IP
> >> (causes more DNS-Lookups).
> >
> >
> > Just a word of caution here, there are several SIP stacks which don't
> handle
> > SRV lookups correctly. I don't mean to discourage you from this, but
> just to
> > be aware of it. For example, Mobicents only understands SRV record sets
> > which return domain names. If you return IPs, Mobicents will go ahead and
> > look them up as A records and fail.
> >
> >>
> >> You can share the dialog state etween two nodes by using the dialog
> >> module in db-only mode (db_mode = 1, see
> >> http://kamailio.org/docs/modules/devel/modules/dialog.html#idp15368320
> ).
> >> You cannot share transactions between two nodes, only dialogs.
> >>
> >> In addition, you can work with virtual IPs with Heartbeat/Pacemaker.
> >>
> >> At a big operator, we've used a combination of the two: Active/Passive
> >> for one site and DNS-SRV to distribute it among different sites.
> >>
> >> Kind regards,
> >> Carsten
> >>
> >> 2014-12-26 19:07 GMT+01:00 Mahmoud Ramadan Ali
> >> <cisco.and.more.blog at gmail.com>:
> >> > Hi Dears,
> >> > I have successfully configured Kamailio HA using Heartbeat and
> Pacemaker
> >> > so
> >> > if one of the two servers should go down the other server will own the
> >> > virtual IP address and take over.
> >> > But i have two questions:
> >> >
> >> > 1.This model is considered to be Active / Passive redundancy so one
> >> > server
> >> > will process the SIP signaling until it goes down and i'm wondering is
> >> > there
> >> > is any way two achieve Active / Active redundancy and if so how the
> >> > signaling will be handled on the servers so they can be aware of the
> >> > transactions and dialogs traversing the servers ? does the signalling
> >> > will
> >> > be replicated or synchronized between the servers or what ?!
> >> >
> >> > 2.What about the servers DB and how they should be designed in a
> cluster
> >> > mode ? i want to replicate all the DBs of the server to get consistent
> >> > user
> >> > registration using the subscriber table for example.
> >> >
> >> > Thanks in advance and Best regards.
> >> >
> >> > _______________________________________________
> >> > 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
> >> >
> >>
> >>
> >>
> >> --
> >> Carsten Bock
> >> CEO (Geschäftsführer)
> >>
> >> ng-voice GmbH
> >> Schomburgstr. 80
> >> D-22767 Hamburg / Germany
> >>
> >> http://www.ng-voice.com
> >> mailto:carsten at ng-voice.com
> >>
> >> Office +49 40 5247593-0
> >> Fax +49 40 5247593-99
> >>
> >> Sitz der Gesellschaft: Hamburg
> >> Registergericht: Amtsgericht Hamburg, HRB 120189
> >> Geschäftsführer: Carsten Bock
> >> Ust-ID: DE279344284
> >>
> >> Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
> >> http://www.ng-voice.com/imprint/
> >>
> >> _______________________________________________
> >> 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
> >
> >
> >
> > _______________________________________________
> > 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
> >
>
>
>
> --
> Carsten Bock
> CEO (Geschäftsführer)
>
> ng-voice GmbH
> Schomburgstr. 80
> D-22767 Hamburg / Germany
>
> http://www.ng-voice.com
> mailto:carsten at ng-voice.com
>
> Office +49 40 5247593-0
> Fax +49 40 5247593-99
>
> Sitz der Gesellschaft: Hamburg
> Registergericht: Amtsgericht Hamburg, HRB 120189
> Geschäftsführer: Carsten Bock
> Ust-ID: DE279344284
>
> Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
> http://www.ng-voice.com/imprint/
>
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