Using the Gin framework to implement containerized deployment and management functions

In today's cloud computing era, containerization has become a very popular application deployment and management method. The Gin framework is a lightweight web framework of the GO language. It has the characteristics of high performance, low memory consumption, and easy maintenance. Therefore, it has become one of the preferred frameworks for web development using the GO language. This article will introduce how to use the Gin framework to implement containerized deployment and management functions. Let us learn about it together.

1. Introduction to Docker

Docker is currently the most popular container technology, which can package applications and their dependencies into containers so that they can easily run anywhere. Docker is open source and has become the de facto standard container solution in the industry.

2. Example of Docker packaging of Gin framework

The following is a simple example of using Docker to package Gin framework:

1. Create and enter the project directory:

mkdir docker-gin && cd docker-gin

2. Create a Dockerfile:

FROM golang:1.13

Settings Working directory

WORKDIR /go/src/app

Install Gin framework

RUN go get github.com/gin-gonic/gin

Add all File to working directory

ADD ./go/src/app

Run command

CMD ["go", "run", "main.go"]

3. Create a main.go file:

package main

import "github.com/gin-gonic/gin"

func main() {
r := gin.Default()
r.GET("/", func (c *gin.Context) {

c.JSON(200, gin.H{
  "message": "Hello World",
})

})
r.Run (":8080")
}

4. Build the image and run the container:

docker build -t docker-gin .
docker run -p 8080 :8080 docker-gin

Now you can access our application through http://localhost:8080.

But after that, we further write some logic to achieve our deployment and management purposes.

3. Containerization deployment and management

Based on the above examples, we add the following two APIs to implement containerization deployment and management functions:

1. POST / deploy: Implement container deployment function

By uploading a zip file, decompressing and building a new image, and finally deploying the new container through Kubernetes scheduling.

The following is a simplified implementation:

func handleDeploy(c *gin.Context) {
file, header, err := c.Request.FormFile("file")
if err != nil {

c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return

}
defer file.Close()

// Save the uploaded file to the local
filename := "deploy/" header. Filename
out, err := os.Create(filename)
if err != nil {

c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return

}
defer out.Close()
_, err = io. Copy(out, file)
if err != nil {

c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return

}

// Decompress the uploaded file
zipReader, err := zip.OpenReader(filename)
if err != nil {

c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return

}
defer zipReader.Close()
for _, zipFile := range zipReader.File {

srcObj, err := zipFile.Open()
if err != nil {
  c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
  return
}
defer srcObj.Close()

dstPath := "deploy/" + zipFile.Name
if !strings.HasPrefix(dstPath, "deploy/") {
  c.JSON(http.StatusBadRequest, gin.H{"error": "invalid file"})
  return
}
if zipFile.FileInfo().IsDir() {
  os.MkdirAll(dstPath, zipFile.Mode())
} else {
  dstObj, err := os.Create(dstPath)
  if err != nil {
    c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
    return
  }
  defer dstObj.Close()

  _, err = io.Copy(dstObj, srcObj)
  if err != nil {
    c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
    return
  }
}

}

// Build a new image and call Kubernetes deployment
cmd := exec.Command("bash", "-c", "docker build -t docker-gin-" strconv.FormatInt(time.Now() .Unix(), 10) " . && kubectl apply -f deploy.yml")
cmd.Dir = "./deploy"
out, err = cmd.CombinedOutput()
if err != nil {

c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return

}
c.JSON(http.StatusOK, gin.H{"message": string(out)})
}

2. DELETE / stop: Close the current container

The following is a simplified implementation:

func handleStop(c *gin.Context) {
// Get the current container ID
hostname , err := os.Hostname()
if err != nil {

c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return

}
cmd := exec.Command("bash", "-c", "kubectl get pod - o jsonpath='{.items[0].metadata.name}'")
cmdOutput, err := cmd.Output()
if err != nil {

c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return

}
podName := strings.TrimSpace(string(cmdOutput))

// Close the current container
cmd = exec.Command("bash", "-c", "kubectl delete pod " podName)
cmdOutput, err = cmd.CombinedOutput()
if err != nil {

c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return

}
c.JSON(http.StatusOK, gin.H{"message": string(cmdOutput )})
}

The implementation of the above two APIs is based on Kubernetes for container management. The use of Kubernetes will not be introduced in detail here.

4. Summary

This article introduces how to use Docker to encapsulate the Gin framework and implement containerized deployment and management functions. In practice, we can implement more detailed implementations based on actual needs. Here is just a simple example. In short, using containerization technology for application deployment and management can improve development efficiency, avoid environment configuration problems, and reduce operation and maintenance difficulties. It is a highly recommended approach.

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