Using *RT for HA purposes was: [Asterisk-Users] Realtime MultipleAsterisk boxes, iaxusers

[Alistair Cunningham]

Tijmen,

We use SER for this to load balance across multiple Asterisks. We then 
use a custom program to monitor the health of the Asterisks and update 
SER's configuration should one go down. 2 SERs share a single IP address 
for users to contact using heartbeat.

It works well, and we have several customers with it in production. The 
load balacing isn't perfect, and it can give uneven loads at low 
capacity, but it gets better as load increases which is where it matters.

Alistair Cunningham,
Integrics Ltd,
+44 (0)7870 699 479
http://integrics.com/


tijmen van den brink wrote:
> I did some research about Asterisk and High Availability and some sort 
> of load balancing. The High Availability issue isnn't much of a problem. 
> I did it with heartbeat en realtime. But the load balancing issue is 
> realy a problem. You want a load balancer to make decisions based on 
> call ID. The call ID is stored in the SIP header (layer 7)  and for all 
> I know there are only a few load balancers that can make decisions based 
> on this layer and those load balancers are not SIP aware. So for now I 
> don't think load balancing with *servers could be easily achieved.
> 
> On 1/4/06, *Kevin P. Fleming* <kpfleming at digium.com 
> <mailto:kpfleming at digium.com>> wrote:
> 
>     Asterisk wrote:
> 
>      > In my case I would be using DNS round robin.  So a UA would only be
>      > registering to one * server at a time.  So wouldn't in fact be an
>      > active/passive?
> 
>     No. You have said that you want the _other_ servers to be aware of that
>     phone's registration and be able to deliver calls to it directly. That
>     will not work.
> 
>     If you want the other servers to send calls to that phone through the
>     server it registered with, then yes, that can easily be done.
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> -- 
> Tijmen van den Brink
> Wilhelminaweg 46
> 3441 XC Woerden
> Tel: 0642233831
> MSN: tijmenvandenbrink at hotmail.com <mailto:tijmenvandenbrink at hotmail.com>
> Skype: tijmenvdbrink at skype.com <mailto:tijmenvdbrink at skype.com>
> SIP:697116 at fwd.pulver.com <mailto:SIP:697116 at fwd.pulver.com>
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