Re: [lvs-users] ipvs or apache/mod_proxy/mod_balancer

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] ipvs or apache/mod_proxy/mod_balancer
From: Michael Schwartzkopff <misch@xxxxxxxxxxx>
Date: Tue, 30 Jun 2009 14:51:42 +0200
Am Dienstag, 30. Juni 2009 14:39:49 schrieb Olaf Krische:
> Thanks for answering to everyone,
> Malcolm Turnbull wrote:
> > Usually we use Direct Routing mode with proxies(squids) because it is:
> >
> > a) source ip transparent
> > b) return traffic doesn't need to go via the load balancer
> > c) its fast
> Okay, i will try this out. Tho, i am not a big fan of giving each squid an
> IP. I do not own a big block.
> I used to have a hardware loadbalancer, which owns the VIP. It would
> rewrite the incoming packet by replacing the VIP with the IP of the chosen
> real server in the LAN. And the real server then had to answer back to the
> loadbalancer, so he can replace the IP of the real server with the VIP
> again. It felt more...self describing and did not need a special
> configuration on the real servers except the routing.


you can do the same config with LVS. Just use NAT mode. The disadvantage: it 
does not scale that good because every traffix has to be routed back through 
gateway. As a rule of the thumb you can tell: About 10 to 20 real servers  in 
NAT mode.

Dr. Michael Schwartzkopff
MultiNET Services GmbH
Addresse: Bretonischer Ring 7; 85630 Grasbrunn; Germany
Tel: +49 - 89 - 45 69 11 0
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mail: misch@xxxxxxxxxxx

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