from Hacker News

AWS randomly assigns AZ names differently across accounts

by craigkerstiens on 11/27/24, 7:18 PM with 4 comments

• by everfrustrated on 12/3/24, 7:25 PM

  Been like this for the longest time.

  Makes sense but a real PITA when using a lot of AWS accounts in an org.

  In hindsight they should have assigned AZ identifiers to something less sequential.

  Instead of

  eu-east-1, eu-east-2, eu-east-3

  Do something like

  eu-east-s, eu-east-k, eu-east-p

  where the suffixes are the same for everyone. Less bias to choosing -1 then.

• by awsanswers on 11/27/24, 7:50 PM

  To prevent the effect of people picking the first zone in the list to launch resources into

• by gladiatr72 on 11/27/24, 11:11 PM

  Yeah. There is an api call that shows the mapping between a region's az names and the static az id's. I wasn't an early adopter but encountered the random az assignment in 2010.