Course Wrap-Up¶

You can now trace a container from application dependency to OCI image, filesystem layers, runtime configuration, namespaces, cgroups, process lifecycle, networking, storage, and a higher-level Docker or Kubernetes workflow.

Next, build a small application with a non-root Dockerfile, Compose stack, named database volume, health check, and reverse proxy. Then deploy the same immutable image to a Kubernetes lab and troubleshoot it with the method from the previous chapter. Understanding the layers is what turns commands into engineering decisions.