Docker Image Layering & Multi-Stage Dockerfiles
Build isolated container images, understand copy-on-write image layers, Docker caching, and write lightweight multi-stage Alpine Dockerfiles.
Docker Architecture & Multi-Stage Builds
### Why Multi-Stage Docker Builds?
Standard single-stage Dockerfiles include build tools (compilers, devDependencies, SDKs) in the final output image, producing bloated 1GB+ images. **Multi-Stage Builds** separate compilation environments from final minimal runtime images (e.g. Alpine Linux).
