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Shrink Docker Images and Fix Slow Builds With Layer Caching

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-18

A repeatable procedure for Docker build speed and size: inspect layers with docker history, order instructions for cache hits, use multi-stage builds, add a .dockerignore, pin and clean package installs, and verify cache reuse in CI.

Every build reinstalls dependencies and the image is a gigabyte. Reorder the Dockerfile for layer caching, use multi-stage builds, add a real .dockerignore, and measure what each layer costs.

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#docker#dockerfile#build-cache#image-size#multi-stage

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