Frank Denis says Stop using ridiculously low DNS TTLs

One of the best DNS posts I’ve seen in the last decade, on short TTL issues. It’s also a great tutorial on how to do data-driven technical analysis.

As a DNS administrator, I knew it was bad, but not that bad. 🙂

I like to use 1 hour TTL during normal times and 1 or 5 minutes during moves, along with a box left behind to redirect requests. But as the article points out, it’s easy to forget to up the TTL after the move.

One of the interesting asides is that if you’re going to use super-low DNS TTL’s, then what about your application cache TTL’s? 🙂

Off-topic, but Frank’s blog post on how he lost weight is quite interesting. At first I thought, “this guy really likes to go overboard,” but large-scale studies of dieters show that diets almost entirely fail, yet he succeeded.

Stop using ridiculously low DNS TTLs HN

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