Availability Zones and High Availability
An Availability Zone (AZ) is one or more discrete data centers within a Region, each with independent power, cooling, and networking.
High availability requires deploying resources across multiple AZs.
A resilient architecture typically includes:
- Load balancing across AZs
- Stateless services distributed across AZs
- Database replication (Multi-AZ)
Deploying in a single AZ creates a single point of failure.
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