Strategy

Strategy: Use Spare Region Capacity to Survive Availability Zone Failures

High Scalability

Aug 2, 2012 — 1 min read

In the wake of the recent Amazon problems Ryan Lackey offers some practical first responder cloud survival advice:

If you're a large site (particularly a PaaS) on AWS and care about availability, you need to have spare capacity in your region (using Reserve Instances, like Netflix does) to cover when a single AZ disappears, and your own external to AWS load balancing (not DNS based), with your own per-AZ subsidiary load balancers (nginx or whatever) running within EC2.

You need a robust database layer, ideally multi-region or AWS + nonAWS, but that's more site specific.

Going multiregion is the next step, and the above is an essential part of getting to that point.

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