How to use Docker with Go?

With the gradual popularization of cloud computing technology, Docker, as a lightweight containerization technology, has attracted more attention. As an efficient and concise new generation programming language, Go language can improve programmers' development efficiency when combined with Docker. This article will introduce how to use Docker in Go language.

1. Introduction to Docker

Docker can be regarded as a lightweight virtual machine based on Go language, with the following characteristics:

1. Management Strong

Docker provides a complete management mechanism that not only effectively manages different applications, but also flexibly expands and contracts resources.

2. Easy to use

Docker’s API is simple to understand and can be easily integrated into applications.

3. Save hardware resources

Docker can maximize the use of physical server resources and improve hardware utilization.

2. How to use Docker in Go language

There are two main ways to use Docker in Go language:

1. Using Docker’s API

Docker provides a REST API interface, which can perform container management and other functions by sending HTTP requests.

The following is a simple example to illustrate how to use Docker's API in Go language.

First you need to use the "net/http" package in the Go language to send HTTP requests. For detailed information about the request, please refer to Docker's official documentation. For example, when creating a container, you can use the following command:

curl -X POST -H "Content-Type: application/json" -d '{

  "Image": "ubuntu",
  "AttachStdin": false,
  "AttachStdout": true,
  "AttachStderr": true,
  "Tty": true,
  "OpenStdin": true,
  "StdinOnce": false
}' http://localhost:4243/containers/create?name=myubuntu

Among them, the requested URL is "http://localhost:4243/containers/create?name=myubuntu" and the request type is POST. If the creation is successful, the container ID is returned, otherwise an error message is returned.

The implementation in Go language is as follows:

import (
"bytes"
"encoding/json"
"io/ioutil"
"net/http "
"os"
)

func createContainer(name string) (string, error) {
//Requested URL
url := "http://localhost: 4243/containers/create?name=" name
//Request method POST
req, err := http.NewRequest("POST", url, nil)
if err != nil {

return "", err

}
//Set request header information
req.Header.Set("Content-Type", "application/json")
//Send request
resp, err := http.DefaultClient.Do(req)
if err != nil {

return "", err

}
defer resp.Body.Close()

//Read return result
content, err := ioutil.ReadAll(resp.Body)
if err != nil {

return "", err

}

//Result returned by parsing
var respStruct struct {

Id string `json:"Id"`

}
err = json.Unmarshal(content, &respStruct)
if err != nil {

return "", err

}
//Return container ID
return respStruct .Id, nil
}

2. Using Docker’s Go language SDK

Docker officially provides the Go language SDK, which can be used directly in the Go language. First install the SDK through the following command:

go get github.com/docker/docker/client

Then use the "context" and "github.com/docker/docker/client" of the Go language The package can easily use Docker's SDK. Here is a simple example:

import (
"context"
"github.com/docker/docker/api/types"
"github.com/docker/docker/client"
)

func main() {
//Connect Docker
ctx := context.Background()
dockerCli, err := client.NewClientWithOpts(client.FromEnv)
if err != nil {

panic(err)

}
//List all containers
containers, err := dockerCli.ContainerList(ctx, types.ContainerListOptions{})
if err != nil {

panic(err)

}
//Output container ID and name
for _, container := range containers {

fmt.Println(container.ID, container.Names)

}
}

3. Summary

Docker is indeed a very excellent containerization technology, and Go language is also a rapid development programming language. By combining the two, programmers can be provided with a more efficient development experience. This article introduces two ways to use Docker in Go language. I hope it will be helpful to readers.

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