[SR-Users] Kamailio Active / Active HA.

[Mahmoud Ramadan Ali]

Thank you Carsten...
Very useful information, i will try this and contact the mailing list if i
have issues.


On Sun, Dec 28, 2014 at 1:44 AM, 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).
>
> You can share the dialog state between 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.
> >
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>
>
>
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