"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. Optimized version:"
Docker builds images as a sequence of layers, caching each layer so unchanged layers can be reused on rebuilds. Instruction order and build context size strongly affect build speed and final image size. Changing an early layer invalidates cache for all following layers, causing repeated work. To maximize cache reuse, place the least frequently changing instructions (such as OS package installation) near the top of the Dockerfile and the most frequently changing steps (such as copying source code) near the bottom. Avoid large or changing build context contents and move long-running installs above source COPY steps. These practices can roughly halve build time and trim image size.
Read at Medium
Unable to calculate read time
Collection
[
|
...
]