安装Docker、kubernetes、node.js。

1. 创建Node.js应用程序

var http = require('http');
var handleRequest = function(request, response) {
  console.log('Received request for URL: ' + request.url);

  response.setHeader('content-type', 'text/html;charset=utf-8')
  response.writeHead(200);
  response.end("我爱唱歌...!");
};
var www = http.createServer(handleRequest);
www.listen(8080);

2. 编写镜像文件Dockerfile

FROM node:16.9.1-slim
EXPOSE 8080
COPY server.js .
CMD node server.js

3. 在dockerfile目录下打包镜像

docker build -t hello-node:v1 .

4. 编写k8s中Deployment的配置文件deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: node-deployment
spec:
  selector:
    matchLabels:
      app: node
  replicas: 1 # 告知 Deployment 运行 2 个与该模板匹配的 Pod
  template:
    metadata:
      labels:
        app: node
    spec:
      containers:
      - name: node
        image: hello-node:v2
        ports:
        - containerPort: 8080

5. 创建k8s的Deployment

kubectl apply -f deployment.yaml

6. 创建k8s的Service服务

kubectl expose deployment node-deployment --type=LoadBalancer

7. 浏览器输入localhost:8080就可以啦。

8. 更新应用

kubectl set image deployment/node-deployment node=hello-node:v2
# node=hello-node:v2, 将容器node更换镜像为hello-node:v2