"Docker builds images in layers, caching each one.When you rebuild, Docker reuses unchanged layers to avoid re-executing steps - this is build caching. So the order of your instructions and the size of your build context have huge impact on speed and image size. Here are the quick tips to optimize and achieve 2 times faster speed building images: 1. Place least-changing instructions at the top Every instruction ( FROM, RUN, COPY, etc.) creates a new layer."
"When one layer changes, all layers after it are rebuilt.So to maximize cache reuse, put the least frequently changing instructions (e.g., installing OS packages) near the top, and the most frequently changing (like copying your source code) at the bottom. Example: Bad Dockerfile: When you change any source file, the entire build re-runs from COPY . ., which invalidates cache for npm install."
Docker caches image layers so rebuilds reuse unchanged layers and avoid re-executing steps. Instruction order and build context size significantly affect build speed and final image size. Place least-changing instructions such as installing OS packages near the top to preserve their cache. Place frequently changing operations like copying source code toward the end to avoid invalidating earlier cached steps. Each Dockerfile instruction (FROM, RUN, COPY, etc.) creates a new layer, and when a layer changes, all subsequent layers are rebuilt. Minimizing context and ordering instructions carefully can roughly double build speed.
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