Jack was standing in front of his empty "Apartment Building." He knew about Namespaces and Cgroups, but he was frustrated. He had his App code sitting on his laptop, but he couldn't just "throw" the files into the building.
He needed a way to give Docker a precise, step-by-step Instruction Book.
"It’s like an ancient scroll," Jack realized. "If I write the instructions correctly, Docker will read it and build exactly what I need, every single time."
So, how do we write this "Instruction Book"? Jack realized that every Dockerfile is just a list of steps to turn an empty room into a working office for his code.
Here are the 5 core commands you need to know:
