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Docker

Containerize anything. Docker basics, Dockerfiles, and Compose.

Browse 8 tutorials → Other topics

Why learn Docker?

  • "Works on my machine" stops being an excuse.

  • A standard packaging format every cloud and CI system understands.

  • Run any database or service locally in one command.

  • The first step toward Kubernetes and modern deployment.

What you can build with Docker

Local dev environments Reproducible CI builds Shipping apps to any cloud Running open-source services without installing them

Docker tutorials

8 articles

Hand-written tutorials, ordered as a recommended learning path.

  1. 01 What is Docker? A clear, no-hype introduction to Docker — what containers actually are, how they differ from virtual machines, and the vocabulary you need before installing anything.
  2. 02 Install & First Container A step-by-step setup guide for Docker on Windows, macOS, and Linux. Install the engine, verify it works, and run your first container in under fifteen minutes.
  3. 03 Dockerfile Basics Learn how to write a Dockerfile from scratch. Understand each instruction, build a real image for a small Node application, and run it as a container.
  4. 04 Docker Compose Learn Docker Compose by building a small two-service app — a web API and a Postgres database — defined in a single compose.yaml file and started with one command.
  5. 05 Images, Layers & Volumes A practical deep dive into how Docker images are stored as layers, how the build cache works, and the real difference between bind mounts and named volumes.
  6. 06 Multi-Stage Builds Use Docker multi-stage builds to ship tiny production images — build with full toolchains, copy only the artifacts. Examples for Node and Go, with .dockerignore and size comparisons.
  7. 07 Env Vars & Secrets How to feed configuration into Docker containers without baking it into the image — ENV vs ARG, --env-file, Compose env, BuildKit secret mounts, and Docker Swarm secrets, with safe defaults.
  8. 08 Docker Networking A practical guide to Docker networking: the default bridge, user-defined bridges, host networking, container DNS, and how port publishing actually works.