Dockerizing a Go Application: Step-by-Step Tutorial

Dockerizing a Go Application Step-by-Step Tutorial

Sure! Here is a step-by-step tutorial on how to dockerize a Go application:

Step 1: Install Docker
First, make sure you have Docker installed on your machine. You can download and install Docker from the official website (

Step 2: Create a Go Application
Create a new directory for your Go application and navigate to it in your terminal. Then, create a new Go file, for example, `main.go`, and add the following code:

package main

import "fmt"

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

Step 3: Create a Dockerfile
In the same directory as your Go application, create a new file called `Dockerfile` (without any file extension). This file will contain the instructions for building your Docker image. Add the following code to the `Dockerfile`:

# Use the official Go image as the base image
FROM golang:1.16-alpine

# Set the working directory inside the container

# Copy the Go modules files
COPY go.mod go.sum ./

# Download and install the Go dependencies
RUN go mod download

# Copy the source code into the container
COPY . .

# Build the Go application
RUN go build -o main .

# Expose a port for the Go application to listen on

# Set the command to run the executable
CMD ["./main"]

Step 4: Build the Docker Image
In your terminal, navigate to the directory containing your Go application and the `Dockerfile`. Run the following command to build the Docker image:

docker build -t my-go-app .

This command will build a Docker image with the tag `my-go-app`. The `.` at the end of the command specifies the build context, which is the current directory.

Step 5: Run the Docker Container
Once the Docker image is built, you can run a Docker container based on that image. Run the following command:

docker run -p 8080:8080 my-go-app

This command will start a Docker container based on the `my-go-app` image and map port 8080 from the container to port 8080 on your local machine.

Step 6: Test the Application
Open your web browser and navigate to `http://localhost:8080`. You should see the message "Hello, Docker!" displayed on the page.

Congratulations! You have successfully dockerized your Go application.

Note: This tutorial assumes that your Go application does not require any additional dependencies or services. If your application requires additional dependencies, you will need to modify the `Dockerfile` accordingly.

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