[Gllug] load balancing ip's

[Dan Kolb]

Murray wrote:

> For reasons beyond my control, the domain must resolve to exactly 1 ip
> address.  Not fussed about complex load balancing tricks, just want an easy
> way to split the load across multiple servers.
> 
> Can it be done with iptables? I know you can use that to NAT 1 ip -> 1 ip,
> but can you do 1 ip -> many ip?
> 
> What's the best/easiest solution?

You can use Linux IP Virtual Servers (IPVS) to provide load balancing - 
we used it with success at ex-workplace. Be prepared for some headaches 
in setting it up, though.

Alternatively, OpenBSD's pf has this facility built-in - you can 
redirect requests to a range of IP addresses, and tell it to use those 
IP addresses in a round-robin fashion (it might now support other 
load-balancing algorithms, but I'm not sure).

Dan


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