[dehrmann]

> building across multiple regions and AZs is a thing

If you do this for resiliency, be prepared to pay the capacity tax (2 regions means 2x capacity, 3 regions means 1.5x), have the machines already running in a multi-region setup (don't expect to be able to spin up instances or even get capacity during an outage), and ready to deal with the added complexity of multi-region hosting.

[coredog64]

There’s all kinds of fun pitfalls with multi-AZ. Like you can create RDS subnets across multiple AZs but then you can’t remove an AZ. Which really sucks when your core database covers all 5 us-east-1 AZs and randomly can’t failover because you picked an instance type that use1-az4 can’t host.