A Deep Dive into OverlayFS, Namespaces, and the Magic of `{}`

If you’ve ever run docker run hello-world , you’ve witnessed magic. A container spins up in milliseconds, isolated from your host, with its own filesystem, network, and process tree. But what actually happens when you hit Enter? As DevOps engineers, we often treat Docker as a black box. We write YAML, push images, and hope for the best. But when things break—when a container won’t start, when disk space vanishes, or when networking fails—knowing the internals isn’t just "nice to have." It’s surv