Let's talk about the process and steps of combined deployment of Golang and Docker

Golang is one of the most popular modern programming languages. Its powerful concurrency control capabilities and concise syntax make it highly valuable in developing web applications, network services and cloud computing. Docker is a technology for quickly building, publishing, and running applications. It packages the entire application and its dependencies into a container, and provides powerful container management capabilities so that the application can run stably in different environments. Therefore, combining Golang with Docker for deployment can make applications more flexible and convenient to migrate and deploy in development, testing and production environments.

This article mainly introduces the process and steps of Golang and Docker deployment.

Preparation work

Before starting the deployment of Golang and Docker, you need to make some preparations, including the following points:

1. Install Docker

Since we want to use Docker for application deployment, Docker must be installed first. For the installation of Docker, please refer to its official documentation.

2. Write Golang application

Before deploying, you need to write the Golang application and ensure that it can run normally locally. Here is a simple sample program as an example, which is used to listen to HTTP requests and return the requested parameters to the client:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello, %s!", r.URL.Path[1:])
    })

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

Save the above code as a main.go file, through The command go run main.go can start the application locally.

Build application Docker image

After the application is written, it needs to be packaged into a Docker image and uploaded to Docker Hub or other private image repositories for use in different environments deploy. The following are the steps to build a Docker image:

1. Create a Dockerfile file

The Dockerfile file is a script file used to build a Docker image, which contains all the commands required to build the image. The following is a simple example Dockerfile:

# 指定基础镜像，这里使用了 Golang 官方镜像
FROM golang

# 将本地应用程序复制到容器的 /app 目录中
ADD . /app

# 指定容器启动时要运行的命令
ENTRYPOINT /app/main

# 暴露监听端口，和应用程序中的端口保持一致
EXPOSE 8080

The above Dockerfile specifies the base image as the Golang official image, copies the local application to the /app directory of the container, and specifies the command to run when the container starts. is /app/main. At the same time, the port monitored by the application is also exposed, making the port accessible through the host's network interface.

2. Build a Docker image

Build a Docker image through the following command:

docker build -t my-golang-app .

This command will build the Dockerfile file in the current directory through the Docker image and specify the name of the image. for my-golang-app.

3. Upload the Docker image

The completed Docker image can be uploaded to Docker Hub or other private image warehouses for deployment in different environments. We take Docker Hub as an example and upload the Docker image through the following command:

docker login
# 输入 Docker Hub 的用户名和密码进行登录

docker tag my-golang-app username/my-golang-app
# 将本地的镜像打上标签并指定上传到 Docker Hub 上的仓库

docker push username/my-golang-app
# 上传 Docker 镜像到 Docker Hub 上

At this point, we have completed the construction and uploading of the Docker image for the Golang application.

Running the application in Docker

After completing the building and uploading of the Docker image, we can start the application in Docker. The following are the steps to start the application in Docker:

1. Pull the Docker image

Pull the Docker image of the Golang application from Docker Hub or private image repository:

docker pull username/my-golang-app

2. Run the Docker image

Run the Docker image through the following command:

docker run -d -p 8080:8080 username/my-golang-app

This command runs the Docker image named username/my-golang-app , and map the host port 8080 where the image runs to the 8080 port in the container. After the Docker container is started, we can access the Golang application by accessing the host's http://localhost:8080/.

Summary

This article introduces how to deploy Golang applications with Docker. After successfully completing the preparation work, application writing, Docker image building, image uploading and image running, We found that application deployment through Docker technology can not only quickly build, publish and run applications, but also improve the stability and scalability of applications, which brings great benefits to the application development and operation and maintenance processes. convenience.

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