[SR-Users] Kamailio Active / Active HA.

Mon Dec 29 19:07:36 CET 2014

Hi Mahmoud,

maybe no-one answered, since it is holiday season and we don't have
guaranteed response times for an open-source mailinglist? Everybody
does community work beside their regular job for free...

You basically need to share a database between the two. There is not
"the one-and-only" way to do this, there are different options here.
You can either use db_cluster to write to several databases in
parallel or you can use some sort of Multi-Master Replication at
database level. The only requirement is, that both servers have the
same data at the same time, no matter how you achieve it.

I personally prefer Maria-DBs Galera Multi-Master-Replication in
conjunction with db_cluster, where i use db_cluster just for database
failover (i have a primary and a backup database server for my
Kamailio-Servers). But that's only my personal view on it.

Thanks,
Carsten

2014-12-29 17:01 GMT+01:00 Mahmoud Ramadan Ali <cisco.and.more.blog at gmail.com>:
> Hi Dears,
> Nobody answered my simple question yet ! what are the prerequisites that i
> need prior to using the db_mode = 1 dialog parameter to synchronize the
> dialogs between the two servers ?
> Do i need to configure Mysql DB Master / Master replication or use only the
> DB_Cluster module
> http://kamailio.org/docs/modules/4.1.x/modules/db_cluster.html to tell the
> servers where to synchronize dialogs ? in other words in Opensips there is a
> module parameter modparam("dialog", "replicate_dialogs_to",
> "192.168.1.111:8080")  to designate the destination that will send the
> dialogs to BUT such parameter is NOT exist in the Kamailio dialog module Doc
> so how the two Kamailo server will know about its peer to send dialogs to it
> ?!
>
> Best regards
>
>
>
> On Mon, Dec 29, 2014 at 1:32 PM, Ben Langfeld <ben at langfeld.me> wrote:
>>
>> 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/
>>
>>
>>
>> _______________________________________________
>> 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/