Build applications using Golang's web framework Echo framework and Kubernetes

With the development of cloud computing and containerization technology, more and more enterprises are beginning to use Kubernetes to manage and deploy applications. As a high-performance development language, Golang is increasingly favored by developers. This article will introduce how to use Golang's web framework Echo framework and Kubernetes to build applications.

Install Go and Echo framework

First, we need to install the Golang development environment and Echo framework locally. The installation of Golang and Echo framework can be operated according to the official documents, and will not be described in detail here.

Writing an Application

Create a new Golang project in your local development environment. We will create a simple web application through which users can query the current time. Create a new folder and create a file called main.go, copy the following code into the file:

package main

import (
    "net/http"
    "time"

    "github.com/labstack/echo"
    "github.com/labstack/echo/middleware"
)

func main() {
    e := echo.New()

    // Middleware
    e.Use(middleware.Logger())
    e.Use(middleware.Recover())

    // Routes
    e.GET("/", func(c echo.Context) error {
        return c.String(http.StatusOK, time.Now().String())
    })

    // Start server
    e.Logger.Fatal(e.Start(":8080"))
}

In the above code, we have used the Echo framework to create an HTTP server, The current time is returned when the user accesses the root path.

Dockerized Application

To simplify the deployment process, we containerize the application and upload it to Docker Hub. Create a file named Dockerfile and copy the following code into the file:

FROM golang:1.13-alpine

RUN apk --no-cache add gcc g++ make

WORKDIR /app

COPY . .

RUN go build -o main .

EXPOSE 8080

CMD ["./main"]

In the above code, we use the 1.13-alpine image officially provided by Golang as the base image, install the compilation dependencies and Copy the source code into the container. Then run the go build command to compile the executable file and finally start the web server.

Run the following command in the project root directory to build the Docker image:

docker build -t yourdockerhubusername/echo-app .

Deploy to Kubernetes

Before deploying, we need to install the Kubectl tool locally and need to have Available Kubernetes clusters. For detailed steps on installing and configuring the Kubectl tool, please refer to the Kubernetes official documentation.

Create a file called echo-deployment.yaml and copy the following code into the file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: echo-app
  labels:
    app: echo
spec:
  replicas: 2
  selector:
    matchLabels:
      app: echo
  template:
    metadata:
      labels:
        app: echo
    spec:
      containers:
      - name: echo-app
        image: yourdockerhubusername/echo-app
        ports:
        - containerPort: 8080

In the above code, we create a file called echo-app Deployment, while using the container image yourdockerhubusername/echo-app to run the application. The number of copies of this Deployment instance is 2, and each copy starts a web server and listens to port 8080.

Next, we need to create a Service to expose the echo-app Deployment instance. Create a file named echo-service.yaml and copy the following code into the file:

apiVersion: v1
kind: Service
metadata:
  name: echo-service
spec:
  ports:
  - name: http
    port: 80
    targetPort: 8080
  selector:
    app: echo

In the above code, we create a Service named echo-service, listen on port 80 and Forward the request to port 8080 of the echo-app Deployment instance.

Run the following command in the project root directory to deploy the application:

kubectl apply -f echo-deployment.yaml
kubectl apply -f echo-service.yaml

After the above command is completed, you can view the IP address of the Service through the following command:

kubectl get svc echo-service

Connect Next, visit http://ab42b129300ad08ba97c21d61e4c7064 in your browser and the application should run normally and return the current time.

So far, we have successfully built a simple web application using Golang's Echo framework and Kubernetes. This method is simple and efficient, and can greatly improve development and deployment efficiency.

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