Amazon EKS — Multi-Cluster Management

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Multi-Cluster Management

When one cluster isn’t enough: multi-region, multi-environment, or compliance isolation.

When to Use Multiple Clusters

Reason Example
Environment isolation dev, staging, production
Regional presence US, EU, Asia-Pacific
Compliance PCI DSS requires isolated workloads
Blast radius Limit impact of cluster failures
Team autonomy Each team manages their own cluster

Multi-Cluster Tools

Tool What It Does
ArgoCD (multi-cluster) Deploy to multiple clusters from one ArgoCD
Rancher Manage multiple K8s clusters (any provider)
AWS EKS Connector Register external clusters in AWS Console
Terraform Provision consistent clusters via IaC
eksctl Quick cluster provisioning

ArgoCD Multi-Cluster

# Register a second cluster with ArgoCD
$ argocd cluster add arn:aws:eks:us-west-2:123456789012:cluster/prod-west

# Deploy to multiple clusters
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: my-app-multi-cluster
spec:
  generators:
    - list:
        elements:
          - cluster: prod-east
            url: https://XXXX.us-east-1.eks.amazonaws.com
          - cluster: prod-west
            url: https://XXXX.us-west-2.eks.amazonaws.com
  template:
    spec:
      source:
        repoURL: https://github.com/myorg/manifests.git
        path: overlays/production
      destination:
        server: "{{url}}"
        namespace: production

What’s Next?

Save money: Cost Optimization Strategies.

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