[SR-Users] Kamailio Redundancy examples/pointers required

[Javier Gallart]

Hello

the net.ipv4.ip_nonlocal_bind = 1 options works fine. We have a very basic
redundancy level, but it fits our current needs; sometimes it's even harder
to troubleshoot the redundancy failures than the actual failures. We have 2
identical servers running kamailio and  listening to the same ip
addresses/ports (you need to enable the sysctl option for that). A
heartbeat process controls in what machine the actual ip addresses are
active. The DB is in one of the servers but we update the shared memory in
both. For us having the DB down for a while is not critical because all the
data is in memory. When one servers goes down the other one takes over
immediately. It's a very comfortable setup also for doing upgrades in the
configuration in a controlled manner.
Hope it helps

Regards

Javi

> ------------------------------
>
> Message: 6
> Date: Thu, 26 Jan 2012 12:13:18 +0500
> From: Sammy Govind <govoiper at gmail.com>
> Subject: Re: [SR-Users] Kamailio Redundancy examples/pointers required
> To: "SIP Router - Kamailio (OpenSER) and SIP Express Router (SER) -
>        Users   Mailing List" <sr-users at lists.sip-router.org>
> Message-ID:
>        <CAJUJwtjMGTuNe1Cu5+BDthgj0xrSJrBM03XzcjZhWJ8Ar7=onQ at mail.gmail.com
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>
> Hi,
> Thanks for taking out time for this. really appreciate your ideas. Here are
> few things I've found useful so far.
>
> http://kamailio.org/events/2011-fosdem/p_usrloc.pdf
> This looks like one thing that one could have to ensure more reliability
> but we do need other application level and physical level failover
> techniques additionally.
>
> For using any technique like Linux-HA, Heartbeat, keepalived, UCARP or any
> floating/virtual IP techniques I really hope that the sysctl option
> mentioned in b/m thread really works.
> http://www.mail-archive.com/sr-users@lists.sip-router.org/msg03714.html


> http://old.nabble.com/Kamilio-Failover-Options-td21947502.html
> DNS SRV is one option. Using another Kamailio on top of two Kamailio is
> again a SPOF so I think its of no use at all.
>
> I hope to get a very reliable and working solution out of these forums.
>
> Regards,
> Sammy
>
> On Wed, Jan 25, 2012 at 9:49 PM, Andreas Granig <agranig at sipwise.com>
> wrote:
>
> > Hi Sammy,
> >
> > On 01/25/2012 02:08 PM, Sammy Govind wrote:
> > > I've been looking for ways to create a redundant Kamailio cluster. I've
> > > googled alot but haven't got any concrete or final wording on any one
> > > solution that'll just work perfectly. The basic requirement is that in
> >
> > HA is never really easy :)
> >
> > > case of Kamailio application failure or in case of physical machine
> > > error the whole setup just starts working on secondary server.
> > >
> > > Please suggest anything whichever you guys are using. Any reference
> URLs
> > > would be very much appreciated.
> >
> > For 1+1 setups, you can use a master/master replication (people also use
> > drbd to sync the whole table space, not sure how good that works) on db
> > level, use write-back mode in kamailio to make sure your registrations
> > are written to DB immediately, then use heartbeat to do the IP/process
> > fail-overs on network/power failures. On top, you can do manual checks
> > to trigger a fail-over in case of high-level failures. I guess this is
> > the typical and most straight-forward scenario. Your mileage might vary,
> > depending on specific environment variables (e.g. you might want to
> > announce your active server via RIP/OSPF using quagga instead of the
> > more common gratuitous arp if your servers are geographically split).
> >
> > For scaling larger, put a kamailio instance acting as load-balancer in
> > front of your proxies and scale them by providing some sharding
> > information to the lb.
> >
> > Also the new db_cassandra backend in master branch looks pretty
> > promising when it comes to HA/scaling. Maybe someone can provide some
> > best practices regarding that as well?
> >
> > Andreas
> >
> >
> > _______________________________________________
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> >
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