On this episode of This is My Architecture https://amzn.to/2zCHg2v, Oz from SimilarWeb walks us through how they use 2 AWS regions in an active/active scenario. They use a Route 53 decision tree, including calculated health checks, to both figure out if a region is healthy as well as trigger a planned maintenance fail-over of a region.
Host: Benjamin Feldon, Sr. Manager, Solutions Architecture, AWS Financial Services
Customer: Oz Katz, VP R&D, Production Engineering, SimilarWeb
Publisher: Amazon Web Services
You can watch this video also at the source.