Security

You can’t secure what you don’t understand. And with container images, understanding means knowing exactly what’s inside — every package, every library, every potential vulnerability. Most teams treat their container images as black boxes. They pull a base image, add their code, and push it to production. But that base image? It contains hundreds of packages you didn’t explicitly choose. Any of them could have known vulnerabilities. Trivy makes the invisible visible. It’s an open-source vulnerability scanner that tells you exactly what’s in your images and what risks they carry. ...

GitOps promises that Git is the source of truth. But what if someone kubectl edits a deployment? What if a mutating webhook changes a resource? What if the cluster silently diverges from what Git says it should be? This is configuration drift, and it’s one of the most insidious problems in Kubernetes operations. ArgoCD can help you detect it — if you configure it correctly. What Is Configuration Drift? Drift happens when the actual state of your cluster differs from the desired state in Git. ...

Kubernetes Network Policies are one of those features that everyone knows they should use but few actually understand. The YAML looks intimidating, the behavior is non-intuitive, and the mental model takes time to develop. I’ve spent hours debugging policies that “should work” but didn’t. Let me save you that pain with a visual approach to understanding Network Policies. The Default: Everything Talks to Everything By default, Kubernetes allows all pod-to-pod communication. Any pod can reach any other pod across any namespace. This is convenient for getting started but terrible for security. ...