🚀 Size-Reduction-Distroless-img

A lightweight, interactive Go calculator CLI app containerized using a multi-stage Docker build — reducing image size from 854MB to just 1.9MB using the scratch base image 🐳📉.

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🧮 About the App

This is a simple command-line calculator written in Go (calculator.go). It supports basic arithmetic operations (+, -, *, /) and takes user input in the format:

🐳 Dockerized with Multi-stage Build

The project uses a two-stage Docker build:

1. Stage 1: Compiles the Go binary using the full Golang environment.
2. Stage 2: Copies only the compiled binary into a scratch image, resulting in an extremely small final image.

🔧 How to Build & Run

✅ At first Build in main repo

docker build -t go-calculator .

✅ At second Build in without the multistage repo

docker build -t reduced-calculator .

✅ Check the docker images size

docker images

📦 Image Size Comparison

Docker Image Base	Image Size
ubuntu (single stage)	854 MB
scratch (multistage)	1.9 MB ✅