How to deploy web applications with Docker+Golang

Docker and Golang are the two hottest technologies today. Docker, as a representative of container technology, can realize the convenient deployment and management of applications; Golang is an efficient programming language that is widely used in Web applications and systems. Program development. This article will introduce how to use Docker and Golang to implement web application deployment.

1. Install Docker

The installation of Docker is very simple. You can download the installation package of the corresponding platform from the official website for installation. After the installation is complete, you can verify whether the installation was successful by running the docker command.

2. Write a Golang Web application

Let’s write a simple Golang Web application. The code is as follows:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, Docker and Golang!")
}

This program is a simple HTTP server. Listen to port 8080 and respond to client requests through the handler function. Now we can run this program locally and use a browser to access http://localhost:8080. We can see a sentence displayed on the page: "Hello, Docker and Golang!".

3. Create a Docker image

In Docker, an image contains all dependencies and files of an application and can run on any Docker container. We need to create a Docker image to package the Golang application so that it can run on any Docker container.

First, we need to create a file named Dockerfile and define the following content in it:

FROM golang:alpine
COPY . /app
WORKDIR /app
RUN go build -o main .
CMD ["/app/main"]

This Dockerfile defines a Docker container based on the alpine image and places our application Copy to the /app directory. Then execute the go build command to compile our application and name the compiled binary file main. Finally, use the CMD instruction to specify the command to be called when the container is running, that is, to run our application.

Next, we need to use the docker build command to create a Docker image. The command is as follows:

docker build -t my-golang-app .

This command will execute the Dockerfile file in the current directory and name the generated image my- golang-app.

4. Run the Docker container

Now, we already have a Docker image named my-golang-app. We can use the docker run command to run the container. The command is as follows:

docker run -p 8080:8080 my-golang-app

This command will start a Docker container on the current machine and map the 8080 port in the container to the 8080 port of the host. Now, we can access http://localhost:8080 in the browser, and we can see a sentence displayed on the page: "Hello, Docker and Golang!", indicating that our program has successfully run in the Docker container.

5. Summary

This article introduces how to use Docker and Golang to deploy web applications, including creating Docker images and running Docker containers. I believe that through the introduction of this article, readers have understood how to package Golang applications as Docker images and run the program on any Docker container.

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