How to dockerize Go application

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How to dockerize Go application

Introduction

When you develop an application then you need to dockerize your application.

Guide

Create an application, say Hello world under ./cmd/test/main.go.

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go mod init test
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package main

import "fmt"

func main() {
	fmt.Println("Hello world")
}

Create Dockerfile to dockerize application.

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FROM golang:alpine AS builder

WORKDIR /src

COPY go.mod go.sum ./
RUN go mod download

COPY ./cmd ./cmd

RUN go build -o app ./cmd/test

FROM alpine:3

WORKDIR /app

COPY --from=builder /src/app ./

ENTRYPOINT ./app

Build docker image following command.

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docker build -t test:latest .

Run docker image following command.

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docker run -it --rm test:latest

Then should print Hello world on terminal.

Conclusion

The multiple stage is important in Dockerfile. It can optimize size of docker image.