golang deployed to docker

In today's rapidly iterative software development environment, the process of deploying applications is becoming increasingly automated and standardized. A major benefit of using container technology is that applications can be deployed across different environments and their operating environment can remain consistent. Docker is a popular containerization technology that provides a standardized running environment for applications so that applications can be easily deployed on different systems. In this article, we will explore how to deploy Golang applications into Docker containers.

1. Create a Golang application

First, we need to create a Golang application. We'll use a simple example program to demonstrate how to package it into a Docker container. Create a file called "hello.go" with the following content:

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

Run the program on your local computer and verify that it correctly outputs "Hello, World!".

2. Creating a Dockerfile

Next, we need to create a Dockerfile that will define how to build our Docker container. Create a file called "Dockerfile" in your application directory and copy the following content into it:

# 构建运行时镜像
FROM golang:1.16-alpine3.13

# 添加应用程序代码
ADD . /go/src/github.com/yourusername/hello

# 将工作目录设置为应用程序代码目录
WORKDIR /go/src/github.com/yourusername/hello

# 构建应用程序
RUN go build -o app

# 将运行时容器暴露在8080端口
EXPOSE 8080

# 设置容器启动指令
CMD ["./app"]

Explain this Dockerfile. First, we use the golang:1.16-alpine3.13 image in golang's official Dockerhub as our basic container to ensure that we have a suitable Golang environment. We then add our application code to the container and set the working directory to our application directory. Next, we build the application, naming it "app". Finally, we expose the container on port 8080 and specify the command to run when the container starts.

3. Build the Docker image

Now we are ready to build the Docker image. Run the following command in your application directory:

docker build -t hello .

This command will build a Docker image named "hello" using the Dockerfile we created earlier. During the build process, Docker will execute every command in the Dockerfile and store it in the image. Build times will vary based on your network speed and local computer performance. After the build is complete, you can check if the new image has been created using the following command:

docker images

You should be able to see the image named "hello".

4. Run Docker Container

The final step is to deploy our application into a Docker container and run it. Run the Docker container using the following command:

docker run -p 8080:8080 hello

This command will start a Docker container named "container" using the "hello" image we just created. The "-p" option maps the container port 8080 to the host port 8080 so that we can access it from the browser on the host. After running the container, you should be able to access "http://localhost:8080" in a web browser on the host machine and see the "Hello, World!" output.

Summary

In this article, we showed how to deploy a simple Golang application into a Docker container. From creating a Golang application to building a Docker image to running a Docker container, all steps are explained in detail in this article. Hopefully this article will be helpful to developers who are looking for how to deploy their Golang applications into Docker containers.

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