[OT] Re: Website failover

On Wed, 2004-07-21 at 10:18, Willem Kossen wrote:
> >"John" <john.vanLit@ratio-it.nl> wrote in message
> news:faa10916.0407200315.71aeb3f6@posting.google.c om...
> >all,
> >How can I configure DNS so
> >that a www request always goes to the primary server A but when server
> >A is offline the same request goes automatically to server B?
>
> use one or more linux hosts with iptables as frontend (have dns point to
> them). the linux iptables will than redirect (DNAT) the traffic on port 80
> to your server A. You run a script that will ping server A every couple of
> seconds. If a few pings fail, you will simply update the iptables rule to
> redirect to server B from the script. You also have the script send you an
> email telling you server A is down.

Instead of making this yourself, avoid all the basic pitfalls and use
something that already exists:

http://www.ultramonkey.org/

Ketil Froyn
ketil@froyn.name
http://ketil.froyn.name/