Using cross-zone load balancing with zonal shift
Networking & Content Delivery Blog
This article discusses using cross-zone load balancing with zonal shift in AWS, focusing on Application Load Balancers (ALBs) and Network Load Balancers (NLBs). Key points include:
- Zonal shift allows mitigation of single Availability Zone (AZ) impairments
- Cross-zone load balancing helps distribute traffic evenly across targets during a zonal shift
- Recommended monitoring strategies include:
- Using synthetic canaries
- Tracking CloudWatch metrics per AZ
- Creating alarms for availability, latency, and fault rate
- Outlier detection helps identify problematic AZs
- Zonal autoshift can automatically respond to AZ impairments
The article provides detailed guidance on creating comprehensive monitoring and alerting strategies to detect and respond to single-AZ performance issues.
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