How to Dockerize Your Golang Application with Hello, World!

Dockerizing a Golang Application

If you’re a Golang developer, then chances are you’ve wanted to dockerize your application at some point. Dockerizing a Golang application can be a great way to increase its reliability, scalability, and security. In this blog post, we’ll walk through the process of dockerizing a simple Golang application using the official Golang image.

Create the Application

We’ll start by creating a simple “hello, world” application. Create a file called “main.go” with the following contents:

package main

import (
"fmt"
)

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

Next, build the application with the following command:

go build

This will create a binary file called “main” in the current directory. This is the final application that we’ll be deploying in our container.

Create the Dockerfile

Next, we need to create a Dockerfile for our application. This file tells Docker how to configure the environment for our application. Create a file called “Dockerfile” with the following contents:

FROM golang:latest

COPY . /go/src/app
WORKDIR /go/src/app
RUN go build -o main .

CMD ["./main"]

This Dockerfile is telling Docker to use the latest version of Golang as the base image, copy the contents of the current directory into the “/go/src/app” directory inside the container, and then run “go build” to compile the application. It then runs the compiled binary with the command “./main”.

Build the Image

Finally, we can build our image. Run the following command:

docker build -t hello-world .

This command will build an image with the tag “hello-world” from the Dockerfile in the current directory.

Run the Container

With the image built, we can now run the container. Run the following command:

docker run --rm -it hello-world

This will run the container, and output the “Hello, world!” message. Congratulations, you’ve successfully dockerized a Golang application!