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Docker

Containerize anything. Docker basics, Dockerfiles, and Compose.

Browse 40 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

40 articles · page 1 of 2

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 Healthchecks Healthchecks tell Docker if a container is alive. Restart policies tell it what to do when it is not. Together they keep your services running.
  9. 09 Compose Aliases Network aliases let containers reach each other under multiple names. Learn how aliases work in Compose, when to use them, and the gotchas to avoid.
  10. 10 Docker vs Podman Compare Docker and Podman on architecture, security, compatibility, and developer experience. Learn which container runtime fits your workflow in 2026.
  11. 11 Compose Watch Learn how to use Docker Compose Watch to automatically sync file changes and rebuild containers during development. Faster feedback loops without manual restarts.
  12. 12 Docker Init Learn how to use docker init to scaffold Dockerfiles, Compose files, and .dockerignore for your projects in seconds. Supports Node.js, Python, Go, Rust, and more.
  13. 13 Docker Scout Learn how to use Docker Scout to scan container images for CVEs, analyze software dependencies, and get actionable remediation advice directly from the CLI.
  14. 14 Slim Images Practical techniques to reduce Docker image size by 90% or more. Covers multi-stage builds, Alpine and distroless bases, layer optimization, and dependency management.
  15. 15 Image Optimization Reduce Docker image size and build time with multi-stage builds, layer caching, distroless bases, and practical Dockerfile patterns.
  16. 16 BuildKit Advanced Master BuildKit's cache mounts, secret mounts, SSH forwarding, and parallel builds to speed up Docker image creation and keep secrets out of layers.
  17. 17 Entrypoint Patterns Master ENTRYPOINT vs CMD, entrypoint scripts, signal handling, and init processes to build containers that start and stop reliably.
  18. 18 Logging & Monitoring Configure Docker logging drivers to route container logs to files, syslog, or centralized systems. Includes monitoring with Prometheus and cAdvisor.
  19. 19 Trivy Scanning Use Trivy to find vulnerabilities in Docker images, Dockerfiles, and IaC before they reach production. Includes CI pipeline integration examples.
  20. 20 tmpfs Mounts Use Docker tmpfs mounts to store sensitive or ephemeral data in memory, keeping it off disk and out of container layers entirely.