Docker & containers¶
A container packages an application with its dependencies so it runs identically on your laptop, in CI, and on a cluster node — the unit Kubernetes (Part III) orchestrates. This chapter goes deep: what a container actually is at the kernel level, how images and layers work, every important Dockerfile instruction and the build cache, multi-stage builds, registries/tags/digests, container networking and storage, Docker Compose, resource-limit math, day-to-day debugging, and image security. …
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