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Shared February 28, 2026
If you use containers but haven't yet mastered Dockerfiles and image building, you're just "running pre-built stuff."
In this lesson, I'll show you the complete Dockerfile structure and how to build an image using Podman (with the same industry standard used with Docker).
✅ What you will learn:
What an image is and why building is the foundation of everything
Dockerfile structure (essential instructions and flow)
Main commands: FROM, WORKDIR, COPY, ADD, RUN, ENV, EXPOSE, CMD, ENTRYPOINT
How to build an image in practice: podman build -t
How to tag, version, and list images
Best practices: caching, layers, .dockerignore, image size, and security
Common errors and how to avoid "heavy and insecure" images
🎯 If you are a Dev, DevOps, Infra, SRE, or want to enter the field, mastering this is mandatory.
💬 Comment below: Do you want an example using Java, Node, or Python in a Dockerfile?
🔔 Subscribe to Rubão's Channel — the next lesson will cover push/pull, registry, and image hardening.
#podman #dockerfile #containers #devops #linux #cloudnative #kubernetes #containersecurity
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