Ben is a project lead for an open source software project at University of Washington. He has worked as a professional software engineer, bioinformatics consultant, and computer science professor.
The answer to 2 is that Docker builds images in layers with rebuilds being triggered for all layers after a change has been detected. Since installing dependencies takes time and happens less frequently than code updates, it is better to isolate that step to avoid having dependencies installed every time you tweak your code.
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The answer to 2 is that Docker builds images in layers with rebuilds being triggered for all layers after a change has been detected. Since installing dependencies takes time and happens less frequently than code updates, it is better to isolate that step to avoid having dependencies installed every time you tweak your code.