> I suggest using perl and Net::DNS::Update to send DDNS updates to your 
> master.  But if you're not using dynamic dns you'll need to come up with 
> your own way to do it.

Don't forget to define a low TTL for your web server else your original
server will still be cached for a while (default 3 days?).

What about IP alias: the secondary web server could takeover 
the IP address then you don't have to manipulate DNS records.

Regards
-- Beat

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