最近开始接触kubernates，在上面部署了下springboot，记录下。

１、创建一个Springboot应用

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import org.springframework.web.bind.annotation.RequestMapping;    import org.springframework.web.bind.annotation.RestController;        @RestController    public class HelloController {            @RequestMapping(value = "/")        public String hello(){            System.out.println("hello方法");            return "Hello, k8s!";        }    }

    之后mvn clean package，打包，得到app.jar，和Dockerfile放在同一个目录下

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mjduan@mjduan-ubuntu:/opt/software/docker/springboot-k8s$ ll    total 676796    drwxr-xr-x 2 mjduan mjduan      4096 2月  15 15:43 ./    drwxr-xr-x 4 mjduan mjduan      4096 2月  15 15:30 ../    -rw-r--r-- 1 mjduan mjduan  16674428 2月  15 15:31 app.jar    -rw-r--r-- 1 mjduan mjduan       362 2月  15 15:37 Dockerfile

２、制作镜像

 Dockerfile的内容为

    List-2.1

FROM openjdk:8        ADD app.jar /opt/app/app.jar    RUN bash -c 'touch /opt/app/app.jar'        # 开放8080端口    EXPOSE 8080        ENV TZ=Asia/Shanghai    RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone        # 配置容器启动后执行的命令    ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/opt/app/app.jar"]

之后执行命令来得到镜像

    List-2.2

mjduan@mjduan-ubuntu:/opt/software/docker/springboot-k8s$ docker build -t hello:1.0 .

3、将该镜像放到所有的节点上

    之后将这个镜像放到k8s的master和俩个node上，这里我是先用

docker save hello:1.0>hello.tar

    命令得到文件hello.tar，之后将hello.tar用scp命令传到k8s的master和俩个node上。

    之后在k8s的master和俩个node上，执行如下命令得到镜像hello:1.0

docker load -i hello.tar

4、kubernates上部署

    好了，上述步骤完成后，在k8s的master上创建yaml文件

[root@localhost mjduan]# vi /data/mjduan/hello.yaml

    hello.yaml的内容如下

apiVersion: apps/v1beta2    kind: Deployment    metadata:      name: example-demo3      labels:        app: example-demo3    spec:      replicas: 1      revisionHistoryLimit: 10      selector:        matchLabels:          app: example-demo3      template:        metadata:          labels:            app: example-demo3        spec:          containers:          - name: example-demo3            #image名称是我们的hello:1.0            image: hello:1.0            ports:            - containerPort: 8080              protocol: TCP            livenessProbe:              httpGet:                path: /                port: 8080              initialDelaySeconds: 30              timeoutSeconds: 30            imagePullPolicy: Never          # Comment the following tolerations if Dashboard must not be deployed on master          tolerations:          - key: node-role.kubernetes.io/master            effect: NoSchedule    ---    apiVersion: v1    kind: Service    metadata:      name: example-demo3      labels:        app: example-demo3    spec:      ports:        - port: 8080          targetPort: 8080      selector:        app: example-demo3      type: NodePort

    部署Docker image，命令如下

[root@localhost mjduan]# kubectl create -f hello.yaml     deployment.apps/example-demo3 created    service/example-demo3 created

    查看pod信息，如下

[root@localhost mjduan]# kubectl get pods    NAME                             READY     STATUS              RESTARTS   AGE    example-demo3-746fc684df-h4dpq   1/1       Running             0          10s

    查看service,如下,NAME为example-demo3的那个就是我们刚刚部署的，端口映射是宿主机的32300对应到容器的8080

[root@localhost mjduan]# kubectl get services    NAME            TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE    example-demo3   NodePort    10.107.189.127   
    
             8080:32300/TCP   1m    kubernetes      ClusterIP   10.96.0.1        
     
              443/TCP          2h
     
    

    访问服务

[root@localhost mjduan]# curl http://k8s.master:32300    Hello, k8s!