How to deploy golang with docker

In today's software development, containerization has become a very popular deployment method. Docker is one of the most popular containerization tools. In Docker, we can use various programming languages ​​to create applications and deploy them to various cloud platforms. Today, we will focus on how to use Docker to deploy an application written in Golang.

Golang is a very popular modern programming language, especially for web application and server-side application development. There is an increasing number of Golang developers because of its many advanced features such as high performance, cross-platform support, and built-in concurrency support. This makes Golang a very ideal programming language for writing modern applications. Let’s see how to deploy our Golang application using Docker.

First, we need to obtain the official image of Golang from Docker Hub. This is very simple, just enter the following command in the terminal:

docker pull golang:latest

This will download and install the latest version of the Golang image. Wait patiently during the downloading process and make sure you have a good internet connection.

Next, we will create a new Golang application. Here we will create a simple website to display a welcome message. First, create a folder and create a new file called main.go inside it:

mkdir myapp
cd myapp
touch main.go

Now, open your favorite code editor and open the main.go file. Then, enter the following:

package main

import (
    "fmt"
    "log"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "欢迎来到我的网站!")
    })

    log.Fatal(http.ListenAndServe(":8080", nil))
}

This program uses Golang’s standard library to create a simple website and send a welcome message to anyone who visits the root URL. We can use the Golang compiler to compile it into a binary file. However, here we will use Docker to build and run it.

Next, we need to create a Dockerfile that contains all the steps required to build and run our application. Create a new Dockerfile in the myapp folder:

touch Dockerfile

Next, we open the Dockerfile and enter the following:

FROM golang:latest

WORKDIR /go/src/app
COPY . .

RUN go get -d -v ./...
RUN go install -v ./...

CMD ["app"]
EXPOSE 8080

Let’s see what this Dockerfile is doing:

• FROM golang:latest will use the Golang official image we downloaded previously as the base image.
• WORKDIR /go/src/app will create a working directory named go/src/app.
• COPY . .Copy the entire application to the working directory.
• RUN go get -d -v ./... will download and install all dependencies (if any).
• RUN go install -v ./... will compile our application and place the binaries in the /bin/app directory.
• CMD ["app"] will run the binary we just compiled as the container's main process.
• EXPOSE 8080 will expose the container’s 8080 port so that we can access this port from the host.

Now, we are ready to build our Docker image. To do this, navigate to the myapp folder in the terminal and run the following command:

docker build -t myapp .

This will build a new image called myapp using the Dockerfile we just created. After the build is complete, we can run it as a container:

docker run -p 8080:8080 myapp

This will create a new container called myapp and map it to the host's 8080 port. Open http://localhost:8080 in your browser and you should be able to see a welcome message.

Now, we have successfully used Docker to deploy a Golang application. We can take our own code, build them into containers, and deploy them to any cloud platform. The power and portability of Docker make containerized applications a future trend, allowing application developers to focus more on the implementation of business logic.

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