Simon Willison’s Weblog

AWS in 2025: The Stuff You Think You Know That’s Now Wrong (via) Absurdly useful roundup from Corey Quinn of AWS changes you may have missed that can materially affect your architectural decisions about how you use their services.

A few that stood out to me:

• EC2 instances can now live-migrate between physical hosts, and can have their security groups, IAM roles and EBS volumes modified without a restart. They now charge by the second; they used to round up to the hour.
• S3 Glacier restore fees are now fast and predictably priced.
• AWS Lambdas can now run containers, execute for up to 15 minutes, use up to 10GB of RAM and request 10GB of /tmp storage.

Also this note on AWS's previously legendary resistance to shutting things down:

While deprecations remain rare, they’re definitely on the rise; if an AWS service sounds relatively niche or goofy, consider your exodus plan before building atop it.