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From Guy Waugh <>
Subject Re: [users@httpd] High availability concept question
Date Wed, 30 Apr 2008 23:50:34 GMT
Adam Martin wrote:
> If I load balance between two 2.2 Apache HTTP Servers on two separate 
> physical servers, what type of device or software can I place in front 
> of the web servers to allow users to access either web server via one IP 
> Address?  I did a quick search in the documentation but wasn’t sure what 
> to look for.  Would it be as simple as pointing the users to a router 
> configured with some type of forwarding?  How do I prevent this device 
> from becoming a single point of failure?  I know these questions are not 
> Apache specific, at least I don’t think they, but after being a member 
> of this list for a couple of months and seeing the level of expertise on 
> this board I figured someone could point me in the right direction.  I 
> am not asking for a how-to response, just concepts on where to start to 
> start looking or which documentation I should look at.  Thanks.

One (open source) solution would be to use an LVS load balancing server 
( to do the load balancing. If you 
want high availability (no single point of failure in the load balancer) 
couple LVS with heartbeat (, so that if your 
active load balancer fails, the inactive load balancer takes over.

There is a learning curve with both those technologies, so if you don't 
have much time (or even if you do), it might be worth a visit to, Simon Horman's project site, in which he 
supplies prebuilt packages to combine LVS and heartbeat together.

The official User-To-User support forum of the Apache HTTP Server Project.
See <URL:> for more info.
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