A typical Node.js Docker image weighs 1.2 GB. A Go binary image can be 800 MB. Most of that weight comes from build tooling, dev dependencies, and operating system packages that have no business being in a production container.
Docker multi-stage builds solve this by separating the build environment from the runtime environment. You compile your application in a fat container with all the tools, then copy only the final artifact into a minimal runtime image.
The result: images that are 10x to 50x smaller, faster to deploy, and more secure.
A multi-stage Dockerfile has multiple FROM statements. Each FROM begins a new stage. You can copy artifacts from earlier stages into later ones, leaving behind everything you do not need.
Key Topics
- Introduction
- How Multi-Stage Builds Work
- Real-World Examples by Language
- Advanced Multi-Stage Patterns
- Image Size Optimization Techniques
Read the full article: https://devtocash.com/blog/docker-multi-stage-builds
Originally published at devtocash.com
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