"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 builds images in layers and caches each layer to avoid rerunning unchanged steps on rebuilds. Layer cache reuse dramatically speeds builds and reduces image size. Instruction order matters because each Dockerfile instruction creates a new layer and changing one layer invalidates subsequent caches. Place least-frequently changing instructions such as OS package installation near the top and put frequently changing steps like copying source code near the bottom. Minimize build context size to reduce unnecessary busting of cache and copying overhead. Structuring Dockerfiles this way can often halve build times and produce smaller, more efficient images.
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