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    Docker

    10 guides

    Beginner Docker 5 min

    Docker Without the Buzzwords

    Understand what Docker actually is and does (images, containers, Dockerfiles, ports, volumes, and Compose) without the enterprise hype.

    dockercontainersdockerfile
    Beginner Docker 12 min

    Images, Containers, and Dockerfiles: The Three Things Everyone Mixes Up

    The recipe, the snapshot, and the running instance: what an image, a container, and a Dockerfile actually are, and how docker build and docker run connect them.

    dockerimagescontainers
    Beginner Docker 12 min

    Your First Dockerfile: Packaging a Node App Without Summoning a Demon

    A real working Dockerfile for a Node and Express app, every instruction explained, plus .dockerignore and the node_modules trap.

    dockerdockerfilenode
    Beginner Docker 13 min

    Ports, Volumes, and Environment Variables: The Docker Why Is Nothing Working Trio

    The three Docker settings that break most beginner setups, and exactly what 3000:3000 really means.

    dockerportsvolumes
    Beginner Docker 10 min

    Docker Compose: Running Your App, Database, and Redis Without 12 Terminal Tabs

    One file to start a Node API, PostgreSQL, and Redis together, with the networks, volumes, and env vars wired up.

    dockerdocker-composepostgres
    Beginner Docker 12 min

    Docker Volumes: Why Your Database Keeps Forgetting Everything

    Why containers are disposable but your data should not be, named volumes versus bind mounts, and how to reset a database on purpose instead of by accident.

    dockervolumespostgres
    Beginner Docker 11 min

    Docker Networking: Why localhost Betrays You

    Why localhost means something different inside a container, how Compose service names work, and the API connection bugs that follow.

    dockernetworkingcompose
    Beginner Docker 12 min

    Dockerizing a Full-Stack App: Frontend, Backend, Database, and Pain

    How Docker fits a real app with a frontend, a Node backend, Postgres, and Redis, and why the frontend is often Dockerized for dev but shipped as static files.

    dockerfull-stackcompose
    Beginner Docker 15 min

    Production Docker: Dev Containers Are Not Automatically Production Containers

    Multi-stage builds, smaller images, non-root users, health checks, restart policies, and secrets, and why npm run dev is not a production command.

    dockerproductionmulti-stage
    Beginner Docker 13 min

    Docker Debugging: When the Container Is Running But Your App Is Dead Inside

    A practical survival guide for Docker problems: ps, logs, exec, inspect, rebuilding without cache, and reasoning through it built but does not work.

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