Migrating DNS records - The ranting of an IT Professional
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The ranting of an IT Professional

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Feb 23 2009   7:51PM GMT

Migrating DNS records



Posted by: Jason Tramer
DNS, best practices

I am really tired of the way some people handle DNS record changes. It’s like people (even people in the IT industry) don’t seem to realize that changes are not instant. It takes on average between 24-48 hours for any record changes to propagate across the Internet and yet you have DNS cowboys trying to cut-over records and then wonder why names aren’t resolving, or mail isn’t flowing.

Best rule of thumb I have seen is maneuver your record change in a way that for that 24-48 hour period either record will work, if you can’t do that at least make your change on Friday before you head to the pub and make sure everyone knows that things may not work properly during the weekend.

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Troy Tate  |   Feb 23 2009   8:13PM GMT

Another thing you can do is set the lifetime on the record to a much lower time a few days before you make the changes. This will cause the cached entries to expire quicker and new ones to be propagated faster. That’s part of the reason there’s a lifetime on DNS entries.