High Availability & Fault Tolerance

Summary

Designing systems to keep running despite individual component failures — redundancy across availability zones, no single points of failure, and automatic failover are the core techniques.

• 1Design a basic high-availability architecture with redundancy across at least 2 availability zones.
• 2Identify the single points of failure in a hypothetical simple architecture and fix them.
• 3Learn the difference between high availability (minimizing downtime) and fault tolerance (continuing to operate despite a failure).