GitOps with ArgoCD — Declarative Deployment on Kubernetes

Push-based deployment (CI runs kubectl apply) is fragile. GitOps flips the model: Git is the single source of truth and ArgoCD continuously synchronizes the cluster with the desired state.

GitOps Principles¶

• Declarative — the entire system described in Git (YAML/Helm/Kustomize)
• Versioned — every change is a Git commit with an audit trail
• Automatic — an agent (ArgoCD) detects drift and corrects it
• Pull-based — the cluster pulls state from Git; CI doesn’t need cluster credentials

ArgoCD Setup¶

An ArgoCD Application for each service — mapping a Git repo/path to a K8s namespace. Auto-sync: a change in Git → automatic deployment. Health checks verify the deployment is healthy. If not → automatic rollback.

Advantages Over Push-Based CI/CD¶

The CI pipeline doesn’t need cluster credentials — more secure. Drift detection — if someone manually changes a resource, ArgoCD reverts it. Rollback = git revert. Audit trail = Git log.

Git = Single Source of Truth¶

GitOps with ArgoCD is the cleanest model for Kubernetes deployment. Declarative, auditable, automatic.