synae , 5 months ago (edited 5 months ago)

While planning your change (or project requiring such change), check the relevant(* see edit) DNS TTL. Figure out the point in the future you want to do the actual change (time T), and set the TTL to 60 seconds at T-(TTL*2) or earlier. Then when it comes to the point where you need to make your DNS change, the TTL is reasonable and you can verify your change in some small amounts of minutes instead of wondering for hours.

Edit: literally check all host names involved. They are all suspect