如何使用Kubernetes部署Nodejs的Http服务

谁践踏了优雅 2022-01-10 07:19 372阅读 0赞

### 制作镜像 ###

mkdir nodeappk8s # 项目名称
    cd nodeappk8s
    npm init # 一路回车
    vim app.js # 创建文件,内容在下面
    npm i -S express # 安装依赖
    # 在package.json文件中新增 {"start": "node app.js"}
    npm start # 测试你的程序没有问题
    vim Dockerfile # 创建Dockerfile, 内容在下面
    docker build -t pengj/nodeappk8s:v1.0.0 . # 构建镜像, 请更改为自己账号名称
    docker run -p 8888:8888 pengj/nodeappk8s:v1.0.0 # 测试你的镜像没有问题
    # 这里需要在你的docker仓库新建镜像,之后执行下面的操作; 我的地址为: https://hub.docker.com/u/pengj
    # 如果先登录再创建,则推送会报仓库不存在
    docker login # 登录, 输入账号和密码
    docker push pengj/nodeappk8s:v1.0.0 # 推送镜像
    复制代码

`app.js`内容

var express = require('express');
    
    var PORT = 8888;
    
    var app = express();
    app.get('/', function (req, res) {
      res.send('Hello world\n');
    });
    
    app.listen(PORT);
    console.log('Running on http://localhost:' + PORT);
    
    复制代码

`Dockerfile`内容

#node镜像版本
    FROM node:8-alpine
    #声明作者
    MAINTAINER Hapiman
    #在image中创建文件夹
    RUN mkdir -p /home/Service
    #将该文件夹作为工作目录
    WORKDIR /home/Service
    
    # 将node工程下所有文件拷贝到Image下的文件夹中
    COPY . /home/Service
    
    #使用RUN命令执行npm install安装工程依赖库
    RUN npm install
    
    #暴露给主机的端口号
    EXPOSE 8888
    #执行npm start命令，启动Node工程
    CMD [ "npm", "start" ]
    复制代码

### 部署镜像 ###

#### 前提 ####

如果你没有搭建`k8s`集群,可以参考[k8s搭建][k8s]

#### 部署 ####

# 新增名字为`node-kube-apps`的namespace,内容在下面,在nodeapp-k8s.yaml会使用
    kubectl apply -f node-kube-apps.yaml
    # 在master机器上创建nodeapp-k8s.yaml,内容在下面,你需要更换`pengj/nodeappk8s:v1.0.0`为你自己的镜像仓库或者直接使用(省事)
    vim nodeapp-k8s.yaml
    # 部署配置, 如果多次部署会存在重复文件, 可以使用kubectl delete -f nodeapp-k8s.yaml删除
    kubectl apply -f nodeapp-k8s.yaml
    # 执行成功会输出
    # deployment "nodeapp-deploy" created
    # service "nodeapp-svc" created
    # ingress "nodeapp-ingress" created
    复制代码

#### 校验 ####

# 可能会出现0/2, 1/2的情况, 等一会儿就OK
    kubectl get deployments -n kube-apps |grep nodeapp
    # nodeapp-deploy   2/2     2            2           109m
    kubectl get svc -n kube-apps |grep nodeapp
    # nodeapp-svc   NodePort   10.97.144.116   <none>        8080:31000/TCP   109m
    kubectl get ingress -n kube-apps |grep nodeapp
    # nodeapp-ingress   nodeappk8s.local             80      110m
    kubectl get pods -n kube-apps |grep nodeapp
    # nodeapp-deploy-5c84c9d676-m7zwc   1/1     Running   0          110m
    # nodeapp-deploy-5c84c9d676-v8r6g   1/1     Running   0          110m
    复制代码

**两种访问方式:**

1.使用集群之间可见ip访问, 只能够在集群部署的机器上可用: `curl http://10.97.144.116:8080/ping`

2.使用通用的ip访问, 但是需要使用配置文件中`32000`端口才行

详细代码[在这里][Link 1]

`nodeapp-k8s.yaml`文件中定义了3类资源`Deployment`、`Service`、`Ingress`;

`Deployment`设置了`replicas: 2`，表示会运行两个`POD`，`strategy`的滚动策略为`RollingUpdate`，`resources`区域定义了一个POD的资源限制，通过`livenessProbe`和`readinessProbe`设置了健康检查

`kube-apps.yaml`内容

apiVersion: v1
    kind: Namespace
    metadata:
       name: node-kube-apps
       labels:
         name: node-kube-apps
    复制代码

`nodeapp-k8s.yaml`内容

---
    apiVersion: extensions/v1beta1
    kind: Deployment
    metadata:
      name: nodeapp-deploy
      namespace: node-kube-apps
      labels:
        k8s-app: nodeappk8s
    spec:
      replicas: 2
      revisionHistoryLimit: 10
      minReadySeconds: 5
      strategy:
        type: RollingUpdate
        rollingUpdate:
          maxSurge: 1
          maxUnavailable: 1
      template:
        metadata:
          labels:
            k8s-app: nodeappk8s
        spec:
          containers:
          - image: pengj/nodeappk8s:v1.0.0
            imagePullPolicy: Always
            name: nodeappk8s
            ports:
            - containerPort: 8888
              protocol: TCP
            resources:
              limits:
                cpu: 100m
                memory: 100Mi
              requests:
                cpu: 50m
                memory: 50Mi
            livenessProbe:
              tcpSocket:
                port: 8888
              initialDelaySeconds: 10
              timeoutSeconds: 3
            readinessProbe:
              httpGet:
                path: /
                port: 8888
              initialDelaySeconds: 10
              timeoutSeconds: 2
    
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: nodeapp-svc
      namespace: node-kube-apps
      labels:
        k8s-app: nodeappk8s
    spec:
      type: NodePort
      ports:
        - name: api
          port: 8888
          targetPort: 8888
          nodePort: 32000
      selector:
        k8s-app: nodeappk8s
    
    ---
    apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: nodeapp-ingress
      namespace: node-kube-apps
    spec:
      rules:
      - host: nodeappk8s.local
        http:
          paths:
          - path: /
            backend:
              serviceName: nodeapp-svc
              servicePort: api
    复制代码

### 参考文档 ###

[手摸手教你写 Kubernetes 的 golang 服务][Kubernetes _ golang]

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转载于:https://juejin.im/post/5cff66e76fb9a07ea803c127

[k8s]: https://link.juejin.im?target=https%3A%2F%2Fgithub.com%2Fhapiman%2Fgorice%2Fblob%2Fmaster%2Fk8s%2Fk8s%25E6%2590%25AD%25E5%25BB%25BA.md
[Link 1]: https://link.juejin.im?target=https%3A%2F%2Fgithub.com%2Fhapiman%2Fnodeappk8s
[Kubernetes _ golang]: https://link.juejin.im?target=https%3A%2F%2Fwww.qikqiak.com%2Fpost%2Fwrite-kubernets-golang-service-step-by-step%2F