Containerize a Go-Gin application with docker!

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Maheshwar Ligard's photo
Maheshwar Ligard July 17
,
2023 <
>
3 min read
Introduction
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introduce

Containerization has become a popular way of packaging and deploying applications. Docker, one of the most popular containerization platforms, enables developers to easily package their applications into lightweight, portable containers that can run anywhere. In this article, we'll 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 computer

Docker installed on your computer

Build the Gin framework application

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

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 JSON messages.

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

Create Dockerfile

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

Create a new file in the same directory as the file with the following contents:

Dockerfilemain.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 the base image and copy our application code into the directory. Then, we download the required dependencies and build our application. In the second stage, we use the official Alpine Linux image as the base image, and copy the executable generated by the first stage to the directory. Finally, we specify the command to run the application when the container starts. /app/app

Build a Docker image

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

docker build -t gin-example .
This command tells Docker to build a new image with that name using the one in the current directory. gin-exampleDockerfile

run docker container

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

docker run -p 8080:8080 gin-example
This command tells Docker to run a new container from the image and maps port 8080 in the container to port 8080 on the host. gin-example

If all is well, you should be able to access your Gin framework application by navigating to http://localhost:8080 in your web browser.

in conclusion

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

I hope this helps you! !