Containerized deployment using Kubernetes in Beego

Using Kubernetes for containerized deployment in Beego

With the popularity of cloud computing and containerization technology, more and more web applications are beginning to adopt containerized deployment. In containerized deployment, Kubernetes has become one of the de facto standards. This article will introduce how to use Kubernetes for containerized deployment in Beego.

1. What is Beego?

Beego is a simple, fast, MVC framework based on Go (Golang). This is an open source framework that can be used to quickly develop high-performance, scalable, maintainable, and testable web applications.

2. What is Kubernetes?

Kubernetes is an open source container orchestration system for managing containerized applications. It provides the ability to automate the deployment, scaling and management of containerized applications. Kubernetes can run in private and public cloud environments and can be deployed across multiple cloud providers.

3. Why use Kubernetes for container deployment in Beego?

Using Kubernetes for containerized deployment in Beego has the following benefits:

1. Portability: Using containerized deployment technology, applications can be put into containers and Deploy anywhere with Kubernetes.

2. Auto-scaling: Use Kubernetes to automatically expand and shrink application containers horizontally to respond to traffic changes.

3. High availability: High availability can be achieved using Kubernetes. If a node fails, Kubernetes will automatically restart the container on other nodes.

4. Easy to manage: Using Kubernetes can simplify the management of applications and infrastructure.

4. How to use Kubernetes for container deployment in Beego?

The following are the steps for containerized deployment using Kubernetes in Beego:

1. Write a Dockerfile file: A Dockerfile file is a script file for building a Docker container. In the root directory of the Beego application, create a file named Dockerfile and add the following content:

FROM golang:1.13 as builder
WORKDIR /app
COPY . .
RUN go mod download
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -o app .

FROM alpine
RUN apk update && apk add --no-cache ca-certificates
WORKDIR /root/
COPY --from=builder /app/app .
CMD ["./app"]

In the above Dockerfile file, line 1 specifies that the base image used is the official golang:1.13 image. Line 2 specifies the working directory as /app. Line 3 copies the Beego application into the container. Line 4 downloads the modules required by the application. Line 5 compiles. Line 7 copies the application into another base image, alpine, which is small and contains only necessary files. The last line specifies the command to run when the container starts.

2. Build the Docker image: Navigate to the directory where the Dockerfile file is located in the terminal and run the following command to build the Docker image:

docker build -t [image name] .

Where [image name] is the Docker to be created Image name. For example, you can use the following command to create a Docker image named my-app:

docker build -t my-app .

3. Deploy using Kubernetes: In Kubernetes, you can use the following three methods to deploy:

(1) Use Deployment deployment: Use the Deployment resource file (deployment.yaml) to define the deployment of the application. This resource file defines the container image to be used, the number of copies, and other information. The following is an example of a deployment.yaml file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app-deployment
spec:
  selector:
    matchLabels:
      app: my-app
  replicas: 3
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app-container
        image: my-app
        imagePullPolicy: Always
        ports:
        - containerPort: 8080

In this file, line 1 specifies the API version, line 2 specifies the resource (Deployment) to be created, line 4 specifies the resource name, and line 7 The row specifies the selector to indicate the Pod to be controlled, the 10th row specifies the number of copies, and the 13th row specifies the information related to the container image.

(2) Use Pod deployment: Use the Pod resource file (pod.yaml) to define the deployment of a Pod. Specify information such as the container image and application port to be used in the resource file. The following is an example of a pod.yaml file:

apiVersion: v1
kind: Pod
metadata:
  name: my-app-pod
spec:
  containers:
    - name: my-app-container
      image: my-app
      imagePullPolicy: Always
      ports:
        - containerPort: 8080

In this file, line 1 specifies the API version, line 2 specifies the resource (Pod) to be created, line 5 specifies the resource name, and line 7 Line 10 specifies the name of the container image to use, and line 10 specifies the application port.

(3) Use Service deployment: Use the Service resource file (service.yaml) to define the Service object. This file specifies information such as the port to be mapped and the service type. The following is an example of a service.yaml file:

apiVersion: v1
kind: Service
metadata:
  name: my-app-service
spec:
  selector:
    app: my-app
  type: LoadBalancer
  ports:
    - name: http
      port: 8080
      targetPort: 8080

In this file, line 1 specifies the API version, line 2 specifies the resource (Service) to be created, line 5 specifies the resource name, and line 7 Line specifies the service selector, line 9 specifies the service type, and line 10 specifies the correspondence between the service mapping port and the container port.

The above are the steps for containerized deployment using Kubernetes in Beego. This way Beego applications can be deployed quickly and easily.

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