# Containerizing Go-Gin application using docker!

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## **Introduction**

Containerization has become a popular way of packaging and deploying applications. Docker is one of the most popular containerization platforms, which enables developers to easily package their applications into a lightweight, portable container that can run anywhere. In this article, we will explore how to containerize a Gin Framework application using Docker.

## **Prerequisites**

To follow along with this tutorial, you will need the following:

* Go programming language installed on your machine
    
* Docker installed on your machine
    

## **Building the Gin Framework Application**

First, let's create a simple Gin Framework application that we will containerize using Docker. Here is an example of a simple Gin Framework application:

```go
package main

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()

	r.GET("/", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{
			"message": "Hello, world!",
		})
	})

	r.Run(":8080")
}
```

This application creates a simple HTTP server that responds to GET requests on the root URL with a JSON message.

Save this code in a file named `main.go`. Now, let's build this application.

```go
go mod init example.com/hello
go mod tidy
go build
```

These commands will create a Go module for our application, download the required dependencies, and build the application. You should now have an executable file named `hello`.

## **Creating a Dockerfile**

Now that we have built our Gin Framework application, let's create a Dockerfile that will allow us to build a Docker image for our application.

Create a new file named `Dockerfile` in the same directory as your `main.go` file, with the following content:

```go
FROM golang:1.16-alpine AS build

WORKDIR /app
COPY . .

RUN go mod download
RUN go build -o /app/hello

FROM alpine:latest

WORKDIR /app
COPY --from=build /app/hello .

CMD ["./hello"]
```

This Dockerfile specifies a two-stage build process. In the first stage, we use the official Golang Docker image as a base image, and copy our application code to the `/app` directory. We then download the required dependencies and build our application. In the second stage, we use the official Alpine Linux image as a base image, and copy the executable file generated in the first stage to the `/app` directory. Finally, we specify the command to run our application when the container starts.

## **Building a Docker Image**

To build a Docker image for our Gin Framework application, we need to run the following command:

```go
docker build -t gin-example .
```

This command tells Docker to build a new image with the name `gin-example` using the `Dockerfile` in the current directory.

## **Running the Docker Container**

Now that we have built a Docker image for our application, we can run it in a container using the following command:

```go
docker run -p 8080:8080 gin-example
```

This command tells Docker to run a new container from the `gin-example` image, and map port 8080 in the container to port 8080 on the host machine.

If everything worked correctly, you should be able to access your Gin Framework application by navigating to [`http://localhost:8080`](http://localhost:8080) in your web browser.

## **Conclusion**

In this article, we have explored how to containerize a Gin Framework application using Docker. We created a simple Gin Framework application and created a Dockerfile to build a Docker image for the application.

I hope this helps, you!!

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