[Freeswitch-users] FreeSWITCH HA + Loadbalancing

Michael Giagnocavo mgg at giagnocavo.net
Sat Aug 29 12:39:52 PDT 2009

Also please remember this means every _application_ also must be "failover" aware. So, if you're using a little calling card or billing app to control your routing, that app will have to explicitly enroll its state as well as restore itself.

Live migration is possible via OpenVZ. OVZ does not have the same overhead of other virtualization techniques such as Hyper-V, ESX, Xen, etc. So you can do media without much worry.  OVZ can work with other virtualization, too; you can spin it up inside of a VMware machine.

But this is *live* migration of the container. It's "just" pausing your container, copying the whole memory, and resuming it on another node. This is not "dead" migration or failover after calls break. However, you could try running a very frequent sync in OVZ, so that if there was a node failure, you could resume from a previously saved state. But, I highly doubt performance would be good enough for this to work successfully on any serious deployment.


From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Raimund Sacherer
Sent: Saturday, August 29, 2009 12:33 PM
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] FreeSWITCH HA + Loadbalancing

Hmm, so basically 100 interested companys which each chip in 1000 bucks :-)

sounds like lots of manpower, but on the other hand, I do not know the issues regarding the SIP protocoll, but, basically, isn't it *just* to tell another FS box to listen on port x for voicetraffic, forward it to ip on port y?

ok, i understand there's a lot going on under the hood, i guess it would mean to setup a call, but take care to not really set up the call, just the internal state ...

hmm, could it theoretically be done with the event system? ok, i guess I have to dive further into the internals to fully understand the scope.

But a live migration, where the box is available, be possible right now? Would be a step i would like to implement just to be able to do work on a hardware node if necesary without interrupting the service ...

Raimund Sacherer
    Open Source It Consulting

Parc Bit - Centro Empresarial Son Espanyol
Edificio Estel - Local 3D
07121 -  Palma de Mallorca

On Aug 29, 2009, at 6:01 PM, Anthony Minessale wrote:

We have previously estimated the development of live fail over (after a box dies where live migration is no longer possible) to exceed 100k in development costs.

It requires several additions to the sofia sip library, freeswitch and a dependancy on some other code we would have to implement to manage it.

It may or may not be worth it to raise that kind of funding just to avoid an occasional disaster.

Then there is a matter of securing the time of the developers necessary to carry out the implementation.

On Aug 29, 2009 10:19 AM, "Brian West" <brian at freeswitch.org<mailto:brian at freeswitch.org>> wrote:

I was able to do this using OpenVZ, You can get away with it on
smaller instances... like if you're doing one instance per company but
don't expect live migration to work as well on large instances with
thousands of calls up at once. You need a fast network, fast disks and
to follow the howto on the wiki.


On Aug 29, 2009, at 4:58 AM, Steve Kurzeja wrote: > You still have hardware failures and fail-over...

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