Docker Multi-Stage Builds Guide

Multi-stage builds in Docker enable the creation of optimized, minimal Docker images by using multiple build stages within a single Dockerfile. This guide explores techniques for utilizing multi-stage builds across various programming languages and scenarios, including advanced optimization practices.

COPY --from=builder /app/package.json ./

This command copies the package.json file from the builder stage to the current image stage. It ensures that only necessary files are included in the final image, reducing its size.

The `--from` flag specifies which previous build step to copy files from.

live demo · related simulation● LIVE

FROM gradle:7.6-jdk17 AS builder

This line defines a new stage named 'builder' using the official Gradle image with Java 17 and Alpine Linux.

The `AS` keyword assigns a name to this build stage, making it easier to reference in subsequent commands.

Frequently asked questions

What are Docker multi-stage builds?

Docker multi-stage builds allow you to create streamlined and efficient Docker images by utilizing multiple build stages within a single image. Each stage can use different base images and commands, resulting in smaller final images.

▶ Try it live

Everything above runs in your browser — open Hash Function Avalanche Visualizer and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Hash Function Avalanche Visualizer simulation