Regions, Availability Zones, and Fault Tolerance
Understand geographic distribution, availability zones, and why your application should survive a datacenter fire.
In 2017, a single Amazon S3 outage in the US-East-1 region took down a significant portion of the internet. Slack, Trello, IFTTT, and thousands of other services went offline — not because their code was broken, but because they depended on infrastructure in a single location and that location had a problem.
The lesson was painful but simple: if your entire application runs in one place, a problem in that place takes everything down. Cloud providers build the tools for redundancy, but they do not force you to use them. Understanding regions, availability zones, and fault tolerance is the difference between an application that survives infrastructure failures and one that goes down with the ship.
Regions — The Geography of Cloud
A region is a geographic area where a cloud provide
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