Cloud Regions and Availability Zones
What are cloud regions and availability zones? How do they affect application architecture?
What are cloud regions and availability zones? How do they affect application architecture?
A region is a geographic area containing multiple data centers (e.g., us-east-1). Availability zones (AZs) are isolated data centers within a region, connected by low-latency links. Deploy across multiple AZs for high availability - if one AZ fails, your app continues running. Choose regions based on user proximity (latency), compliance requirements, and service availability.
Understanding regions and AZs is fundamental to designing resilient cloud applications. AWS has 30+ regions with 3-6 AZs each. Deploying across AZs provides fault tolerance with minimal latency penalty. Multi-region deployments add disaster recovery but increase complexity and cost.
AWS CLI region commands
Multi-AZ deployment in Terraform
- Deploying everything in a single AZ, creating a single point of failure
- Choosing regions only based on cost without considering user latency
- Not accounting for data residency and compliance requirements
- What is the difference between high availability and disaster recovery?
- How do you handle data replication across availability zones?
- What factors influence region selection for a new application?
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