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Learning AWS - Second Edition by Amit Shah, Aurobindo Sarkar

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Zonal Availability or Availability Zone Redundancy

Availability Zones are distinct geographical locations engineered to be insulated from failures in other zones.  It is critically important from a HA perspective to run your application stack in more than one zone. In addition, avoid dependencies across the zones as far as possible. For sites with very high request loads, a 3-zone configuration may be the preferred configuration to handle zone-level failures. In this situation, if one zone goes down, then other two AZs can ensure continuing high availability and uninterrupted customer experience.

In the event of a zone failure in a multi-AZ configuration, there are several challenges. The DNS record will contain multiple IP addresses and ...

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