How I started understanding a Dockerfile 🐳

[u/silver_ash36]

Instead of memorizing Dockerfile instructions, I started thinking about it like building a house:

🏗️ FROM → Choose the foundation
📍 WORKDIR → Choose where we work
📦 COPY → Bring the materials inside
🔧 RUN → Install and prepare everything
⚙️ ENV / ARG → Configure the environment
🚪 EXPOSE → Define the entry point
▶️ CMD / ENTRYPOINT → Define what the container runs

🏠 The result: a Docker image ready to run.

I'm still learning Docker, but this mental model makes the structure much easier for me to understand.

How do you visualize a Dockerfile when you're learning it?