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Building Resilient Multi-cluster Applications with Amazon EKS, Part 1: Implementing Cross-cluster Load Balancing with NLB

Networking & Content Delivery Blog

This article discusses building resilient multi-cluster applications using Amazon EKS, focusing on cross-cluster load balancing with Network Load Balancer (NLB) through AWS Load Balancer Controller (LBC) version 2.10+.

  • Multi-cluster deployment offers benefits like blue-green upgrades, enhanced workload resilience, and improved disaster recovery
  • New feature enables NLB to register targets from different EKS clusters into the same target group
  • Uses a ConfigMap for each TargetGroupBinding to manage targets across multiple clusters
  • Demonstrates two scenarios: extending existing NLB configuration and implementing new multi-cluster load balancing
  • Provides step-by-step guide for configuring cross-cluster traffic distribution

The solution allows seamless traffic routing across multiple Kubernetes clusters, improving application availability and simplifying cluster management.

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