💡 Originally published on devtocash.com — where this guide stays updated. I write hands-on DevOps/SRE deep-dives there weekly.
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
I walk you through it step-by-step with real Dockerfiles: shrinking a 1.2 GB image down to 80 MB using multi-stage builds — plus the common pitfalls that silently break your CI pipelines. Full guide at devtocash.com
Originally published at devtocash.com
📌 Read the latest version of this guide — plus the full library of DevOps, SRE, Kubernetes, observability & cloud-cost guides — on devtocash.com.
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