[Users] Load Balancing

[Watkins, Bradley]

> -----Original Message-----
> From: users-bounces at openser.org 
> [mailto:users-bounces at openser.org] On Behalf Of Andreas Granig
> Sent: Tuesday, December 05, 2006 8:20 AM
> To: Marcos Hack
> Cc: Thomas Deillon; users at openser.org
> Subject: Re: [Users] Load Balancing
> 
> Marcos Hack wrote:
>   > I don't know these modules, but here we solve this problem using a
> > unique VIP (Virtual IP) for all openSER cluster nodes.
> 
> How do you ensure that all messages belonging to one 
> transaction are balanced to the same physical server? Is 
> there now SIP support in LVS?
> 

I use UltraMonkey (www.ultramonkey.org), but it's basically a packaging
of Linux-HA and LVS.

LVS supports connection persistence, and that works very well.  The
level of granularity of load balancing is on a per-IP basis, not
per-transaction (LVS only does L3 load-balancing, not L4-7).  But
assuming a reasonable value for the persistence timeout, there should be
no problems with SIP transactions (and I haven't experienced anything
problematic).

Ldirectord also supports SIP health checks (they're pretty basic OPTIONS
requests, but it's something), and will fail over to working SIP
proxies.  Of course, in-progress transactions will fail as the OpenSER
process on one box doesn't have the stateful knowledge of the other.

Regards,
- Brad
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