Multi-cluster GitOps

Overview

GitOps shines in multi-cluster environments. By treating clusters as just another resource to be declared in Git, you can scale management to hundreds of clusters consistently.

Strategies

• Hub-and-Spoke: A central management cluster (Hub) controls many target clusters (Spokes).
• Cluster Groups: Tag clusters (e.g., env=production, region=us-east) and apply GitOps policies to groups.

Example: ArgoCD ApplicationSet (Multi-Cluster)

Targeting multiple clusters based on labels.

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
spec:
  generators:
  - clusters:
      selector:
        matchLabels:
          environment: production
  template:
    spec:
      project: default
      destination:
        server: '{{server}}'

Result: ArgoCD will automatically create/update an application in every cluster labeled with environment: production.

ArgoCD: Syncing 5 applications across 5 production clusters...
Status: Synced