Docker · 11 phases · 40 topics · ~8 h

The Docker Roadmap

Every phase is labelled by level so you can start where you are. Each topic opens with a real-life analogy, then commands and code you run yourself, then questions with reveal answers. Progress is saved as you go.

Beginner no prior knowledgeIntermediate day-to-day workAdvanced production and interviews

Where should I start?

Pick a path for your goal

New to containers

You've heard of Docker but never used it seriously.

Java developer

You want your Spring Boot app containerised properly.

Production & internals

You'll run containers at scale.

The full curriculum

Level

Phase 0

The Docker Mindset

Beginner ~54 min0/4 · 0%

Why containers exist, and the vocabulary everything else in this course builds on.

Phase 1

Images & Containers

Beginner ~54 min0/4 · 0%

The two core objects in Docker, their full lifecycle, and the commands you'll type a hundred times a day.

Phase 2

Dockerfile Mastery

Beginner ~69 min0/5 · 0%

Writing your own images — instructions, layers, caching, and the habits that separate a working Dockerfile from a good one.

Phase 3

Data & Volumes

Intermediate ~41 min0/3 · 0%

Containers are disposable; your data usually isn't. This phase is about keeping the two separate on purpose.

Phase 4

Docker Networking

Intermediate ~41 min0/3 · 0%

How containers talk to each other, to your host, and to the outside world.

Phase 5

Docker Compose

Intermediate ~40 min0/3 · 0%

Stop typing 15-flag docker run commands by hand — describe your whole multi-container app in one file.

Phase 6

Dockerizing Java & Spring Boot

Intermediate ~54 min0/4 · 0%

Everything from Phases 1-5, applied specifically to the JVM's quirks and Spring Boot's conventions.

Phase 7

Optimization & Security

Advanced ~27 min0/2 · 0%

Making images smaller, builds faster, and containers genuinely harder to break out of.

Phase 8

Registries, CI/CD & Interview Mastery

Advanced ~55 min0/4 · 0%

Getting your image from your laptop to production, and the interview questions that test whether you actually understand any of this.

Phase 9

Container Internals

Advanced ~28 min0/4 · 0%

What a container really is: Linux namespaces, cgroups, the runtime stack (containerd, runc, OCI), overlay filesystems, and rootless containers.

Phase 10

Production Docker: BuildKit, Runtime & Debugging

Advanced ~30 min0/4 · 0%

Faster, safer builds with BuildKit and buildx (multi-arch images, cache and secret mounts, remote caches), running containers properly (restart policies, healthchecks, limits, read-only filesystems, logging drivers), debugging containers in trouble, and the wider container ecosystem.

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