Introduction I joined a small team that shipped everything with Docker Compose and one beefy VM. We were proud — containers, immutable images, fast deploys. At first, this looked fine… until it wasn’t. This is not a tutorial on manifests. It’s a set of real mistakes, decisions, and trade-offs I lived through while moving from Docker-only workflows to Kubernetes. Here’s what we learned the hard way. The Trigger Traffic spiked after a marketing campaign. Our single VM hit CPU and memory limits. Services crashed, logs disappeared, and the restart logic was messy. We chose Kubernetes because it promised automatic restarts, scaling, and better deployment control. That decision exposed a dozen hidden assumptions. What Went Wrong (and why it stung) Misreading Docker for Kubernetes We treated Kubernetes as "Docker, but bigger". We containerized everything and expected the platform to be magic. Reality: containers are just a packaging unit. Kubernetes adds scheduling, networking, and state management.…