Zero-Downtime Kubernetes Deployments with ArgoCD

Introduction

In modern cloud-native environments, downtime is the enemy. This post walks through how we achieve zero-downtime deployments using ArgoCD and Kubernetes rolling updates.

Prerequisites

• Kubernetes cluster (GKE/EKS/AKS)
• ArgoCD installed
• Helm 3.x

Step 1: Configure ArgoCD Application

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: my-app
  namespace: argocd
spec:
  source:
    repoURL: https://github.com/Gaya2001/my-app
    targetRevision: HEAD
    path: helm/my-app
  destination:
    server: https://kubernetes.default.svc
    namespace: production
  syncPolicy:
    automated:
      prune: true
      selfHeal: true

Step 2: Rolling Update Strategy

Configure your Deployment to use rolling updates with appropriate surge and unavailability settings.

Conclusion

With ArgoCD and proper Kubernetes configuration, zero-downtime deployments become the default behaviour for your entire platform.