"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:"
"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 builds images in layers and caches each layer. Rebuilding reuses unchanged layers to avoid re-executing steps, which is build caching. Instruction order and build context size significantly affect build speed and final image size. Each Dockerfile instruction (FROM, RUN, COPY, etc.) creates a new layer. When a layer changes, all subsequent layers are rebuilt, reducing cache reuse. To maximize caching, place the least-frequently-changing steps (for example installing OS packages) near the top and the most frequently changing steps (for example copying source code) near the bottom. Changing source files can invalidate earlier caches such as npm install.
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