Dockerfile Tutorial | Build Your First Docker Image (Step-by-Step) | Episode 4
In this video, you’ll learn how to write your first Dockerfile from scratch and build a real Docker image for a Python Flask application.
A Dockerfile is like a recipe — once written, Docker can recreate the exact same environment anytime, anywhere.
We’ll cover:
What a Dockerfile is and why it matters
Step-by-step breakdown of a real Dockerfile
Understanding core instructions: FROM, WORKDIR, COPY, RUN, ENV, EXPOSE, CMD
Building your image using docker build
Running your container with port mapping
How Docker processes instructions layer by layer
Important optimization tip: Layer caching (save minutes on rebuilds!)
You’ll also learn a crucial best practice used by professionals to speed up Docker builds dramatically.
By the end of this video, you’ll be able to create, build, and run your own Docker images confidently.
🚀 Next Episode: Docker Volumes — Persist Your Data Like a Pro