GitOps with ArgoCD and Kubernetes
🎯 Problem Statement Traditional deployment approaches often suffer from: Manual deployments leading to human errors Configuration drift between environments Lack of audit trail for changes Slow rollback processes during incidents No single source of truth for cluster state 💡 Solution Overview I implemented a GitOps-based continuous deployment pipeline using ArgoCD that treats Git as the single source of truth for declarative infrastructure and application definitions. 🏗️ Architecture ┌ │ └ ┌ │ │ │ └ ┌ │ │ │ │ │ └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ G ( - - - ─ ─ ─ ─ A S R ─ ─ i C ─ ─ ─ ─ p o e ─ ─ t I B T P ─ ─ ─ ─ p u p ─ ─ H u e u ─ ─ ─ ─ l r o ─ ─ u P i s s ─ ─ ─ ─ i c s ─ ─ b i l t h ─ ─ ─ │ ▼ ─ c e i ─ │ │ ▼ ─ p d ─ ┌ │ │ │ │ │ └ ─ ─ ─ a t ─ ─ A e I ─ ─ ─ ─ ─ ─ t C o ─ ─ c l m ─ ─ ─ ─ ─ ─ i o r ─ ─ t i a ─ ─ ┌ │ │ └ ─ ─ ─ ─ o d y ─ ─ i n g ─ ─ ─ N ─ ─ ─ ─ ─ n e ─ ─ o e e ─ ─ ─ a ─ ─ ─ ─ ─ ─ ─ n ) ─ ─ ─ m ─ ─ ─ ─ ─ ─ ─ s ─ ─ ─ D e ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ e s ─ ─ ─ ─ ┐ │ │ │ ┘ ┐ │ │ │ │ │ ┘ ─ ─ v p ─ ─ ─ ─ ─ ─ ─ ─ ─ a ─ ─ ─ ─ ─ ─ ─ ─ ─ c ─ ─ ─ ─ ─ ─ ─ ─ K ─ e ─ ─ ─ ─ ─ ─ ─ ─ u ┐ │ │ ┘ ─ ─ ─ ► ► ─ ─ b ─ ─ D ─ ┌ │ │ │ └ ┌ │ │ │ │ ┼ │ └ ─ e ┌ │ │ └ ─ ─ e ─ ─ ─ ─ ─ ─ ─ r ─ N ─ ─ ─ v ─ ─ ─ ─ ─ ─ ─ n ─ S a ─ ─ ─ e ─ ─ ─ ─ ( - - ─ - ─ ─ e ─ t m ─ ─ ─ l ─ ─ C ( ─ ─ C ─ ─ ─ t ─ a e ─ ─ ─ o ─ ─ o K ─ ─ D S H ─ R ─ ─ e ─ g s ─ ─ ─ p ─ ─ n 8 ─ ─ A y e ─ o ─ ─ s ─ i p ─ ─ ─ e ─ ─ f s ─ ─ r P n a ─ l ─ ─ ─ n a ─ ─ ─ r ─ ─ i ─ ─ g l c l ─ l ─ ─ C ─ g c ─ ─ ─ ─ ─ g Y ─ │ │ ▼ ─ o a t ─ b ─ │ ▼ ─ l ─ e ─ ─ ─ W ─ ─ A ─ ─ C t h ─ a ─ ─ u ┐ │ │ ┘ ─ ─ o ─ ─ R M ─ ─ D f ─ c ─ ─ s ─ ─ r ─ ─ e L ─ ─ o C ─ k ─ ─ t ┌ │ │ └ ─ ─ k ─ ─ p ) ─ ─ r h ─ ─ ─ e ─ N ─ ─ ─ f ─ ─ o ─ ─ m e ─ ─ ─ r ─ a ─ ─ ─ l ─ ─ ─ ─ ) c ─ ─ ─ ─ P m ─ ─ ─ o ─ ─ ─ ─ k ─ ─ ─ ─ r e ─ ─ ─ w ─ ─ ─ ─ ─ ─ ─ ─ o s ─ ─ ─ ─ ┐ │ │ │ ┘ ┐ │ │ │ │ ┼ │ ┘ ─ ─ d p ─ ─ ─ ─ ─ ─ ─ a ─ ─ ─ ─ ─ ─ ─ c ─ ─ ─ ─ ─ ─ ─ e ─ ─ ─ ─ ─ ─ ┐ │ │ ┘ ─ ─ ─ ─ ─ ─ ─ ─ ┌ │ │ │ └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ C R ( ─ ─ ─ │ │ │ │ ─ ─ ─ ─ o e A ─ ─ ┐ │ ┘ ─ ─ ─ n g C ─ ─ ─ ─ ─ t i R ─ ─ ─ ─ ─ a s / ─ │ │ │ │ │ ┘ ─ ─ ─ i t G ─ ▲ │ │ ─ ─ ─ n r C ─ ─ ─ ─ e y R ─ ─ ─ ─ r ) ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐ ┘ ┐ │ │ │ ┘ │ 🛠️ Technologies Used Category Technology GitOps Platform ArgoCD 2.8+ CI Platform GitHub Actions Container Registry Azure Container Registry Kubernetes AKS / GKE Secrets Management Sealed Secrets / External Secrets Notifications Slack, Microsoft Teams Metrics Prometheus + ArgoCD Metrics 📁 Repository Structure # a ├ ├ ├ │ │ └ # g ├ │ │ │ │ │ │ │ │ │ ├ │ │ │ │ │ │ └ p ─ ─ ─ ─ i ─ ─ ─ A p ─ ─ ─ ─ G t ─ ─ ─ p - i o p r s D . └ R t p a ├ │ │ │ │ └ a ├ │ │ │ └ i ├ ├ └ l e r o g ─ E O s p ─ ─ r ─ ─ n ─ ─ ─ i p c c i ─ A p - p ─ ─ g ─ ─ f ─ ─ ─ c o k t D s r s o r a e h w └ M e / b ├ ├ ├ └ ├ ├ └ c a ├ ├ └ p └ a c i m t r u o ─ E C p a ─ ─ ─ ─ v ─ ─ ─ d p ─ ─ ─ r ─ s e n o i f b r ─ . o o s ─ ─ ─ ─ e ─ ─ ─ / p ─ ─ ─ o ─ t r g n o i / k m n / e r l j r t r i n l f c d f / d s i k l d s p i a a a e m u - e t e l i i e e n u a e t r c p p p c y c m s o R o . g p r g s y v a o a p p p t - t a s r e w y u l v r t s g d t - - - s p u n - i p s a r o i e o i / i d s p / r r a n n o / m a y c s m n o e t r o e g g g s l t m e s i g n v a o j / e i / i i e . . z / s . g d e r n t o n y y a y i . c / x o n t a a t a n y t / r . m m i m g a . y R y l l o l . m y e a n y l a p m . a m o l y m l s a l i m t l o r y 🔄 GitOps Workflow CI Pipeline (GitHub Actions) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 name: CI Pipeline on: push: branches: [main] pull_request: branches: [main] jobs: build-and-push: runs-on: ubuntu-latest steps: - uses: actions/checkout@v7 - name: Build and test run: | docker build -t app:${{ github.sha }} . docker run app:${{ github.sha }} npm test - name: Push to ACR uses: azure/docker-login@v1 with: login-server: ${{ secrets.ACR_LOGIN_SERVER }} username: ${{ secrets.ACR_USERNAME }} password: ${{ secrets.ACR_PASSWORD }} - run: | docker tag app:${{ github.sha }} ${{ secrets.ACR_LOGIN_SERVER }}/app:${{ github.sha }} docker push ${{ secrets.ACR_LOGIN_SERVER }}/app:${{ github.sha }} update-manifests: needs: build-and-push runs-on: ubuntu-latest steps: - uses: actions/checkout@v7 with: repository: org/gitops-repo token: ${{ secrets.GH_PAT }} - name: Update image tag run: | cd apps/overlays/dev kustomize edit set image app=${{ secrets.ACR_LOGIN_SERVER }}/app:${{ github.sha }} - name: Commit and push run: | git config user.name "github-actions" git config user.email "github-actions@github.com" git add . git commit -m "Update dev image to ${{ github.sha }}" git push ArgoCD Application Definition 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 apiVersion: argoproj.io/v1alpha1 kind: Application metadata: name: my-app-dev namespace: argocd finalizers: - resources-finalizer.argocd.argoproj.io spec: project: default source: repoURL: https://github.com/org/gitops-repo.git targetRevision: HEAD path: apps/overlays/dev destination: server: https://kubernetes.default.svc namespace: dev syncPolicy: automated: prune: true selfHeal: true syncOptions: - CreateNamespace=true retry: limit: 5 backoff: duration: 5s maxDuration: 3m0s factor: 2 🔐 Security Implementation RBAC - Role-based access control for ArgoCD users SSO Integration - Azure AD / GitHub OAuth Sealed Secrets - Encrypted secrets in Git Network Policies - ArgoCD namespace isolation Audit Logging - Complete audit trail of all changes 📊 Results & Metrics Metric Before After Deployment Frequency Weekly Multiple per day Lead Time for Changes 2-3 days < 1 hour Mean Time to Recovery 4 hours < 15 minutes Change Failure Rate 15% < 2% 🔑 Key Learnings Separation of Concerns - Keeping app code and configuration in separate repos provides clear boundaries Progressive Delivery - Promoting changes through environments (dev → staging → prod) catches issues early Self-Healing - ArgoCD’s self-heal feature ensures the cluster always matches the desired state Observability - ArgoCD’s built-in dashboard provides excellent visibility into deployment status 🔗 Resources GitHub Repository: github.com/yourusername/gitops-argocd Related Blog Post: Getting Started with GitOps Interested in implementing GitOps? 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