What is ArgoCD?

ArgoCD is a tool that automatically keeps your applications running exactly as you define in your code repository. It continuously syncs your desired application state with what’s actually running in your Kubernetes cluster, making deployments faster and more reliable.

Let's break it down

  • “Automatically keeps your applications running”: It means ArgoCD handles updates without you manually clicking buttons.
  • “Exactly as you define in your code repository”: Your application’s setup (like version, location) is stored in a Git repo, and ArgoCD follows those instructions precisely.
  • “Continuously syncs”: It constantly checks for changes in your code and applies them to your cluster in real-time.
  • “Desired application state”: The ideal setup you want for your app (e.g., “run version 2.0 on server X”).
  • “Kubernetes cluster”: A group of servers that manage your apps in containers.

Why does it matter?

ArgoCD matters because it eliminates manual deployment errors, speeds up updates, and ensures your apps always match your code. This saves time, reduces mistakes, and lets teams focus on building features instead of fixing deployment issues.

Where is it used?

  • In cloud environments where teams deploy apps to Kubernetes (like Google Cloud or AWS).
  • For DevOps teams automating software releases in companies like Spotify or Tesla.
  • When managing multiple apps across different environments (e.g., testing, staging, production).
  • In organizations adopting “GitOps,” where code repositories are the single source of truth for infrastructure.

Good things about it

  • Automates deployments, reducing human error and saving hours of manual work.
  • Provides real-time visibility into deployment status, so you know exactly what’s happening.
  • Works with any Git repository, making it easy for developers to use familiar tools.
  • Supports complex setups like multi-cluster management and can roll back changes instantly if something breaks.

Not-so-good things

  • Requires knowledge of Kubernetes and GitOps, which can be challenging for beginners.
  • Adds complexity to your setup, as you need to manage ArgoCD itself alongside your apps.
  • May be overkill for very small projects or teams with simple deployment needs.
  • Can struggle with non-Kubernetes environments, limiting its flexibility outside containerized apps.