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GitOps & Continuous Delivery with ArgoCD ☸️

GitOps is an operational framework that takes DevOps best practices used for application development (such as version control, collaboration, compliance, and CI/CD) and applies them to infrastructure automation and application delivery.

🔑 Core GitOps Principles

  1. Declarative System State: The entire system configuration (infrastructure configurations, Kubernetes manifests, applications) is defined declaratively.
  2. Version Controlled (Git): Git is the single source of truth for the desired system state.
  3. Automated Pull/Sync: Software agents automatically pull the desired state from Git and apply it to target environments.
  4. Continuous Reconciliation: The system continuously monitors for drift (differences between desired state in Git and actual state in the cluster) and remediates it.

🐙 Continuous Delivery with ArgoCD

ArgoCD is a declarative, GitOps continuous delivery tool for Kubernetes. It runs as a controller inside the cluster, pulling configurations directly from Git repositories.

Key ArgoCD Features:

  • Active Reconciliation & Drift Detection: Automatically detects when someone modifies resources manually in the cluster and reverts changes to match Git.
  • Application Controller & CRDs: Defines cluster workloads using Custom Resource Definitions (CRDs) like Application and ApplicationSet.
  • Multi-Cluster Management: Allows a single management cluster running ArgoCD to manage deployments across multiple external Kubernetes clusters.
  • Sync Strategies: Supports automated sync, pruning (deleting removed resources), and self-healing.
  • Visual Dashboard: Real-time web UI showing application health, sync status, and resource tree visualizations.

🛠️ GitOps & ArgoCD Patterns

  • App-of-Apps Pattern: A master ArgoCD Application that manages and deploys other Applications, enabling nested configuration management.
  • ApplicationSets: Automates the generation and deployment of multiple ArgoCD Applications across multiple clusters and repositories using generators.