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Re: NOTICE: svn.collab.net migration *tonight*

From: John Peacock <jpeacock_at_rowman.com>
Date: 2006-03-14 22:31:07 CET

Garrett Rooney wrote:
> On 3/14/06, C. Michael Pilato <cmpilato@collab.net> wrote:
>> I'm going to try to pull off the svn.collab.net migration tonight, somewhere
>> around midnight Central (US) time. CollabNet Ops should be onhand to tweak
>> DNS for me, so hopefully there will be very little downtime.
>
> When you do so please post the new ip address so that people stuck
> behind slowly updating DNS servers can force a switch --relocate to
> the current tree.

That's what setting a smaller TTL is supposed to ease. If the CollabNet
people can set the TTL for that address to 10 minutes now, then remote
clients will get the new address sooner without having to play games.
DNS is designed specifically to allow the _server_ to dictate terms to
the _client_. Of course, since the current TTL is 24 hours, that isn't
going to be much help. Something to think of moving forward, though.
It doesn't hurt to set the TTL down even if you don't know which 24 hour
period you are going to actually perform an upgrade[1].

Garret - you do realize you'll just have to do a second switch
--relocate once the new name/address is propagated.

John

1. Or you can run tinydns and automatically switch from one record to
another and have the server dynamically adjust the TTL while doing so:

        http://cr.yp.to/djbdns/tinydns-data.html

See the third paragraph under Data Format.

-- 
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
4501 Forbes Boulevard
Suite H
Lanham, MD  20706
301-459-3366 x.5010
fax 301-429-5748
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Received on Tue Mar 14 22:31:06 2006

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