Dockerfile Tutorial (STOP Copy-Pasting!) | Build Faster, Smarter Docker Images

Most developers copy-paste Dockerfiles and run docker build . without really knowing what’s happening under the hood.

In this step-by-step breakdown, I’ll walk you through a real-world Dockerfile — line by line — and show you:

✅ What each instruction actually does (FROM, COPY, RUN, CMD, etc.)
✅ The hidden danger of docker build .
✅ Why your builds are slow (hint: it’s your build context)
✅ How to use .dockerignore to fix CI performance
✅ Simple best practices that save HOURS in the pipeline

Whether you're new to Docker or just tired of slow builds and flaky cache issues, this video is your no-BS guide to writing better Dockerfiles — fast.

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Видео Dockerfile Tutorial (STOP Copy-Pasting!) | Build Faster, Smarter Docker Images канала LearnwithDevOpsEngineer