29 Dec
2014
29 Dec
'14
6:01 p.m.
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(a)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(a)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(a)langfeld.co.uk>uk>:
handle
--
Carsten Bock
CEO (Geschäftsführer)
ng-voice GmbH
Schomburgstr. 80
D-22767 Hamburg / Germany
http://www.ng-voice.com
mailto:carsten@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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On 27 December 2014 at 23:44, Carsten Bock
<carsten(a)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 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(a)gmail.com>om>:
> > 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(a)lists.sip-router.org
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>
--
Carsten Bock
CEO (Geschäftsführer)
ng-voice GmbH
Schomburgstr. 80
D-22767 Hamburg / Germany
http://www.ng-voice.com
mailto:carsten@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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