Why Kustomize Overlays Create Configuration Drift

Episode notes

In this episode of DevOps Daily, Lucas and Luna tackle a subtle but costly problem in Kubernetes configuration management: Kustomize overlays that silently diverge from their base configurations. Using a real-world example from a mid-size e-commerce company, they break down how three overlays intended to customize deployments for dev, staging, and production environments ended up creating a cascade of misconfigurations. Lucas explains the root cause—a common anti-pattern where overlay patches override base fields without version control warnings—and walks through how a simple diff-and-lint pipeline could have caught the drift before it caused a production outage. Luna challenges the assumption that Kustomize alone is enough for configuration hygiene, and they discuss when teams should consider tools like Helm or Jsonnet for tighter validation. If you are using Kustomize in your Kubernetes workflows, this episode will save you from a painful debugging session.