Kubernetes at Scale: Implementing GitOps with ArgoCD
How we transitioned to a pure GitOps workflow to manage 500+ microservices with zero downtime and automated rollbacks.
The Problem with ClickOps
Managing infrastructure manually or via ad-hoc scripts quickly becomes a nightmare at scale. Configuration drift occurs, and tracking changes becomes impossible. Enter GitOps.
Why ArgoCD?
By declaring our entire Kubernetes state in Git repositories, ArgoCD acts as a reconciliation engine. It constantly compares the live cluster state with the Git repository. If someone manually edits a deployment, ArgoCD immediately overwrites it back to the declared state in Git.
Progressive Delivery
We use Argo Rollouts to implement Canary deployments. When a new version of a microservice is merged, it is routed 5% of traffic. We monitor error rates and latency in Datadog automatically. If metrics remain stable, traffic is gradually increased to 100%. If an anomaly is detected, Argo automatically rolls back to the previous stable version in seconds.