目录

基于Node构建应用

app.js

const http = require('http');
const os = require('os');

console.log("Kubia server starting...");

var handler = function(request, response) {
  console.log("Received request from " + request.connection.remoteAddress);
  response.writeHead(200);
  response.end("You've hit " + os.hostname() + "\n");
};

var www = http.createServer(handler);
www.listen(8080);

Dockerfile

FROM node:16-slim
ADD app.js /app.js
ENTRYPOINT ["node", "app.js"]

构建

docker build -t wangjunjian/kubia .

运行

docker run -d -p 8080:8080 wangjunjian/kubia:latest

查看运行的容器

docker ps

CONTAINER ID        IMAGE                              COMMAND                  CREATED              STATUS              PORTS                     NAMES
2fe47d1cbcde        wangjunjian/kubia:latest           "node app.js"            About a minute ago   Up About a minute   0.0.0.0:8080->8080/tcp   wonderful_ramanujan

访问应用

curl http://localhost:8080

You've hit 2fe47d1cbcde

可以看到容器的ID作为主机名

发布应用

docker push wangjunjian/kubia:latest

基于Kubernetes部署应用

编写kubia.yaml

apiVersion: v1
kind: Service
metadata:
  name: kubia
  labels:
    app: kubia
spec:
  type: NodePort
  ports:
  - port: 8080
    targetPort: 8080
    nodePort: 30088
  selector:
    app: kubia

---

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

部署

kubectl apply -f kubia.yaml

service/kubia created
deployment.apps/kubia created

访问服务

for _ in {1..5}; do curl http://localhost:30088; done

You've hit kubia-864465c9d-744qc
You've hit kubia-864465c9d-kzql7
You've hit kubia-864465c9d-kzql7
You've hit kubia-864465c9d-744qc
You've hit kubia-864465c9d-kzql7

如果在集群外访问，将localhost替换为集群中的任意一台服务器的IP即可。

参考资料