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Re: how to relocate servers transparently

The biggest problem you will have is with the DNS.

Set 1 of the DNS servers to the new IP, and keep 1 behind.

Make sure the TTL is low... very low.

Then, make sure the new DNS server on the new IP address is up and running
with the old DNS server on the old IP (if possible), so at all times there
is at least 1 DNS server running and active.

Then do the switch.

This way should help you minimize downtime.


----- Original Message ----- 
From: "Rhesa Rozendaal" <lists.debian@rhesa.com>
To: <debian-isp@lists.debian.org>
Sent: Monday, 14 June, 2004 5:36 PM
Subject: how to relocate servers transparently

> Hello all,
> I'm looking for some practical advice on moving servers from one
> colocation to another.
> In a couple of weeks, we need to move our servers to a different
> colocation, which means all the ip addresses will change.
> The servers are running regular stuff: web, mail, ftp, and two dns
> In the past I witnessed such a move, and there were a lot of problems
> with the DNS. As it turned out, many DNS servers out there kept caching
> the old ip addresses for over 3 days, causing a lot of connection issues
> for many users. Beforehand we did lower the ttl on all the domains prior
> to the move, but many dns servers seemed to ignore that. On top of that,
> we moved both our dns servers at the same time, which was a big mistake
> So, what I'd like to hear from you is practical advice on how to avoid
> connection problems after the move is complete.
> Will it be enough to keep 1 dns server behind? I'm afraid it won't be,
> given the dns caching problem mentioned above. Is there a way to have
> that 1 dns server act as a proxy or port forwarder in some way? Can that
> be done between two different class A networks?
> Btw, the servers are running debian stable (woody).
> Thanks in advance,
> Rhesa Rozendaal
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