Step-by-Step: Configuring Amazon EC2 for Business-Critical Applications, Part 3

How to prepare your EC2 infrastructure to span two different regions — the first step in ensuring your business-critical applications can endure the failure of an entire AWS region.

In Part 1 and Part 2 of this series, we looked at how to prepare the Amazon EC2 infrastructure to support business-critical applications by clustering them across two availability zones (AZs) in the same Amazon Web Services (AWS) region. While that does qualify you for the 99.99 percent AWS Compute SLA, it still does nothing to protect you from the outage of an entire region. As we recently saw in the Dec. 7 AWS outage, relying on a single AWS region leaves you at risk if an entire region experiences an outage.

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