ArgoCD Multi-Cluster GitOps: Sync Waves, Canary Rollouts & Secret Management
Deep-dive architectural patterns for orchestrating declarative Kubernetes deployments across multiple EKS and GKE clusters with automated canary rollouts and dynamic secrets.
Sikander Ali
Senior DevOps Architect (CKA, AWS Pro)
Executive Engineering Summary & Takeaways
- Hub-and-Spoke ArgoCD control planes separate deployment definitions from cluster access credentials.
- Sync Waves and PreSync Hooks ensure database migrations run to completion before application pods update.
- Argo Rollouts with Prometheus metrics automates traffic shifting and instantaneous rollback upon error threshold breach.
1. Hub-and-Spoke Control Plane Architecture
Managing individual GitOps controllers inside every single Kubernetes cluster leads to configuration drift and credential sprawl. In enterprise architectures, we deploy a centralized ArgoCD Hub cluster that securely drives spoke clusters across multi-cloud regions.
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
name: core-microservices
namespace: argocd
spec:
generators:
- clusters:
selector:
matchLabels:
environment: production
template:
metadata:
name: '{{name}}-core-api'
spec:
project: default
source:
repoURL: 'https://github.com/technofreaks/gitops-manifests.git'
targetRevision: HEAD
path: 'environments/{{name}}/core-api'
destination:
server: '{{server}}'
namespace: production
syncPolicy:
automated:
prune: true
selfHeal: trueReady to Upgrade Your Cloud Infrastructure?
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