[asterisk-users] Load balancing Asterisk.

[SIP]

Unless the LB is SIP-aware, and can maintain a SIP session, I don't see
how it would work. As the SIP command stream sends discrete commands,
without some sort of basic level of session awareness, there's no
guarantee over a reasonable-length call that the INVITE and BYE would
even get sent to the same Asterisk box. If there are on-hold messages or
transfers occurring, you add even more possibility of error into the
mix.  Now... you could do some sort of VERY long session timeout, but
overall, that's a hack that's going to drop your concurrent connection
count faster than using a smaller box would.

I don't know of any functioning, SIP-aware load balancers at the moment.
Doesn't mean they don't exist. I just can't think of any off the top of
my head.

N.



Nitzan Kon wrote:
> Alex,
>
> I realize and agree that "hardware" load balancers are actually
> software based. I'm less concerned about that and more about the
> general specs:
>
> Foundry ServerIron XL: rated for 1,000,000 concurrent connections
> Linux box where OpenSIPS is sitting: rated for ...???
>
> Not to mention a simple rule on a load balancer would be much,
> much easier to implement. All I need is IP-based load balancing
> so installing and maintaining OpenSIPS is an overkill.
>
> Again, I appreciate the feedback but I am not asking nor looking
> for a software solution. My question is simple:
>
> Will a HARDWARE load balancer work? any reason why it WON'T work?
>
> Thanks!
>
>
> --- On Thu, 11/20/08, Alex Balashov <abalashov at evaristesys.com> wrote:
>
>   
>> What do you mean by "hardware" options?  There are
>> no ASIC-assisted SIP load balancers out there.  :-)  The
>> embedded "hardware-based" options are load
>> balancers built just like PCs - often on top of a UNIX
>> kernel - that run a software application-aware load
>> balancing suite.
>>
>> Your best bet is a proxy for the round-robin part, and
>> Linux-HA for the high availability of the proxy, as Grygoriy
>> suggested.
>>
>> Nitzan Kon wrote:
>>
>>     
>>> --- On Thu, 11/20/08, Grygoriy Dobrovolskyy
>>>       
>> <megahohol at gmail.com> wrote:
>>     
>>>> 2 openser servers with 3 ip adresses (1 virtual) +
>>>> heartbeat to ensure the
>>>> failover + watchdog to ensure if
>>>>         
>> opensips/kamalio/openser
>>     
>>>> crashes a nice
>>>> failover & reboot, it is working stable here
>>>> (dispatching to 10 servers +
>>>> owners DID dispatch to their respective servers)
>>>>
>>>> join #opensips on freenode if you need more info.
>>>>         
>>> Thanks for the info. :)
>>>
>>> I want to stay away from software solutions however.
>>>       
>> Are there
>>     
>>> any hardware solutions? would a plain load balancer
>>>       
>> work?
>>     
>>> If we can't get it working with a LB we'll
>>>       
>> look at OpenSIPS,
>>     
>>> but I'd like to explore hardware options first.
>>>
>>> Thanks!
>>>
>>> --
>>> Nitzan Kon, CEO
>>> Future Nine Corporation
>>> www.future-nine.com
>>>       
>
>
>
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