Docker / Kubernetes部署Java / SpringBoot项目

小灰灰 2022-04-15 03:55 315阅读 0赞

# 一、部署流程 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlaHVhbmNodW4wMzEx_size_16_color_FFFFFF_t_70]

# 二、构建镜像 #

## 1、创建应用 ##

可以到 [http://start.spring.io/][http_start.spring.io] （或者借助IDE）创建一个SpringBoot 的应用，在创建的时候，请选择Web 依赖，以方便部署到 Kubernetes 之后可以查看效果。

## 2、暴露测试接口 ##

新建一个Rest接口：

@RestController 
    public class HelloCtroller { 
      @RequestMapping("/")
      public String home() { 
      return "Hello Docker World";
      } 
    }

## 3、添加Docker Image 依赖 ##

dockerfile-maven-plugin 用于打包和上传 Docker Image：

<plugin>
     <groupId>com.spotify</groupId>
     <artifactId>docker-maven-plugin</artifactId>
     <version>0.4.14</version>
     <configuration>
       <imageName>${project.groupId}.${project.artifactId}</imageName>
       <dockerDirectory>${project.build.outputDirectory}</dockerDirectory>
       <dockerHost>http://127.0.0.1:2375</dockerHost>
       <resources>
         <resource>
           <directory>${project.build.directory}</directory>
           <include>${project.build.finalName}.jar</include>
         </resource>
       </resources>
     </configuration> 
    </plugin>

`<imageName>${project.groupId}.${project.artifactId}</imageName>`只指定了镜像名称，默认tag为latest，也可以`<imageName>${project.groupId}.${project.artifactId}:${project.version}</imageName>`指定tag。

## 4、jar包的Dockerfile ##

在resources目录下创建Dockerfile文件：

FROM java:8
    MAINTAINER "hoaven"<hoaven@163.com>
    ADD demo-0.0.1-SNAPSHOT.jar app.jar
    EXPOSE 8080
    CMD java -jar app.jar

## 5、war包的Dockerfile ##

FROM tomcat:8
    MAINTAINER "hoaven"<hoaven@163.com>
    ADD demo-0.0.1-SNAPSHOT.war /usr/local/tomcat/webapps/app.war
    EXPOSE 8081
    CMD ["catalina.sh", "run"]

## 6、上传镜像 ##

> mvn clean install docker:build

## 7、docker中运行项目 ##

**docker images 查看镜像**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlaHVhbmNodW4wMzEx_size_16_color_FFFFFF_t_70 1]

**docker run 启动运行镜像**

> docker run -p 8080:8080 -t com.docker.demo:latest

启动成功后可通过访问http://localhost:8080查看效果。

## 8、删除容器 ##

为了集成k8s，先把刚创建的container停止并删除。

> docker stop container\_id  
> docker rm container\_id

# 三、集成k8s #

## 1、创建YAML文件 ##

apiVersion: apps/v1beta2  
    kind: Deployment  
    metadata:  
      name: demo-jar  
      labels:  
        app: demo-jar  
    spec:  
      replicas: 1
      revisionHistoryLimit: 10
      selector:  
        matchLabels:  
          app: demo-jar 
      template:  
        metadata:  
          labels:  
            app: demo-jar  
        spec:  
          containers:  
          - name: demo-jar
            image: com.docker.demo:latest
            ports:  
            - containerPort: 8080
              protocol: TCP  
            livenessProbe:  
              httpGet:  
                path: /  
                port: 8080 
              initialDelaySeconds: 30 
              timeoutSeconds: 30 
            imagePullPolicy: IfNotPresent  
          # 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: demo-jar
      namespace: default
      labels:  
        app: demo-jar
    spec:  
      ports:  
        - port: 8080 
          targetPort: 8080
      selector:  
        app: demo-jar 
      type: NodePort

## 2、创建Deployment和Service ##

> kubectl create -f example-demo.yaml

创建Deployment时会根据replicas参数值来自动创建对应数量的pod。

**查看Service：**  
![在这里插入图片描述][20181121113326276.png]

**查看pod日志：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlaHVhbmNodW4wMzEx_size_16_color_FFFFFF_t_70 2]

**验证Rest接口：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlaHVhbmNodW4wMzEx_size_16_color_FFFFFF_t_70 3]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlaHVhbmNodW4wMzEx_size_16_color_FFFFFF_t_70]: /images/20220415/4977281e9d8c412dab3c9ed483e02cab.png
[http_start.spring.io]: http://start.spring.io/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlaHVhbmNodW4wMzEx_size_16_color_FFFFFF_t_70 1]: /images/20220415/df896f30283a4b67b32db91d6658c2d1.png
[20181121113326276.png]: /images/20220415/1a71934999eb458ba21383ce202a8187.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlaHVhbmNodW4wMzEx_size_16_color_FFFFFF_t_70 2]: /images/20220415/bc7a61c8c6e34ef197563c5591652237.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlaHVhbmNodW4wMzEx_size_16_color_FFFFFF_t_70 3]: /images/20220415/bfda57c69abd4f4f96ee5f54835c6675.png