Dev's multi-stage docker wizardry shrinks image 90% from 1.2gb bloat to 120mb lean—finally, deployments faster than endless synergy standups

A developer has successfully reduced the size of their Docker image by 90% using multi-stage builds, from 1.2GB to 120MB. The optimization technique involves using multiple FROM statements in the Dockerfile, allowing for the separation of build and production stages. This approach enables the exclusion of unnecessary build tools, dev dependencies, and source files from the final production container. The developer achieved this reduction by utilizing a Node.js application as an example, leveraging the node:18-alpine base image, which is approximately 110MB, compared to the standard node:18 image, which is around 900MB. By applying this method, the build time was reduced by 60%, push/pull time by 85-90%, and disk space by 90%, with a 40% reduction in memory usage. This optimization technique has significant implications for the industry, particularly in terms of performance, cost, and developer experience, and can be applied to various applications, including Go, Python, and Java.