Four Docker Techniques That Shrink Image Size from Gigabytes to Megabytes

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Bloated Docker images slow down deployments and waste disk space, but several practical techniques can reduce image sizes by up to 90%. Multi-stage builds separate the build environment from the final runtime image, eliminating toolchains and dev dependencies from production containers. Choosing the right base image matters significantly — options range from full Debian (~1 GB) down to distroless or scratch images as small as 8–15 MB for compiled languages like Go and Rust. Proper layer ordering, a well-configured .dockerignore file, and combining cleanup commands within single RUN instructions prevent unnecessary data from being baked into layers. Tools like 'docker history' and 'dive' help developers measure actual layer sizes and identify waste, with real-world results showing Node.js apps shrinking from 1.1 GB to under 180 MB and Go services reaching single-digit megabytes.

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