K8S部署SpringBoot应用

灰太狼 2023-10-10 09:55 60阅读 0赞

## 必要条件 ##

1.  K8S环境机器做部署用，推荐一主双从。[推荐安装文档][Link 1]
2.  Docker Harbor私有仓库，准备完成后在需要使用仓库的机器docker login。
3.  开发机器需要Docker环境，build及push使用

### 基础配置准备 ###

#### 一、构建基本Springboot工程，本例所用版本及结构如下图 ####

![版本及结构][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70]  
创建测试代码，简单打印几行log  
![测试代码][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70 1]

#### 二、maven配置 ####

##### 1. properties配置 #####

##### 2. plugins配置 #####

<plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        
        <plugin>
            <groupId>com.spotify</groupId>
            
            <artifactId>dockerfile-maven-plugin</artifactId>
            <version>1.4.10</version>
            <configuration>
                
                <dockerfile>src/main/docker/Dockerfile</dockerfile>
                <repository>${docker.repostory}/${docker.image.prefix}/${project.artifactId}</repository>
                
                <tag>${project.version}</tag>
                <buildArgs>
                    
                    <JAR_FILE>target/${project.build.finalName}.jar</JAR_FILE>
                </buildArgs>
            </configuration>
        </plugin>
    </plugins>

#### 三、Dockerfile文件 ####

#基础镜像，如果本地仓库没有，会从远程仓库拉取
    FROM openjdk:8-jdk-alpine
    #容器中创建目录
    RUN mkdir -p /usr/local/pasq
    #编译后的jar包copy到容器中创建到目录内
    COPY target/dockertest-0.0.1.jar /usr/local/pasq/app.jar
    #指定容器启动时要执行的命令
    ENTRYPOINT ["java","-jar","/usr/local/pasq/app.jar"]

### 构建镜像并推送 ###

1.  构建镜像，执行如下命令  
    ![插件编译][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70 2]  
    构建镜像日志如下  
    ![编译日志][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70 3]
2.  完成后`docker images`可以查看打包的镜像  
    ![在这里插入图片描述][20190924185804504.png]
3.  命令窗口执行`docker push REPOSITORY`推送至docker harbor  
    ![推送][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70 4]  
    docker harbor可以查看到推送的镜像  
    ![dockerharbor][]

### K8S部署 ###

#### 1. 创建dockertest.yaml文件如下 ####

apiVersion: v1
    kind: Service
    metadata:
      name: dockertest
      namespace: default
      labels:
        app: dockertest
    spec:
      type: NodePort
      ports:
      - port: 8080
        nodePort: 30090 #service对外开放端口
      selector:
        app: dockertest
    ---
    apiVersion: apps/v1
    kind: Deployment #对象类型
    metadata:
      name: dockertest #名称
      labels:
        app: dockertest #标注 
    spec:
      replicas: 3 #运行容器的副本数，修改这里可以快速修改分布式节点数量
      selector:
        matchLabels:
          app: dockertest
      template:
        metadata:
          labels:
            app: dockertest
        spec:
          containers: #docker容器的配置
          - name: dockertest
            image: 192.168.1.253:8081/pasq/dockertest:0.0.1 # pull镜像的地址 ip:prot/dir/images:tag
            imagePullPolicy: IfNotPresent #pull镜像时机，
            ports:
            - containerPort: 8080 #容器对外开放端口

#### 2. 运行`kubectl create -f dockertest.yaml`创建Deployment ####

完成后执行`kubectl get pods`如下图，可以看到启动了三个pod  
![getpods][]

#### 3. 运行`kubectl logs -f podsname`查看日志 ####

新开窗口分别查看3个pod的日志，然后访问`k8s master节点IP+service对外开放端口`访问springboot应用，我这里使用`http://192.168.1.250:30090/test/test`, 多刷新几次可以看到pod直接做了负载，如下图：  
pods1:  
![pods1][]  
pods2:  
![pods2][]  
pods3:  
![pods3][]  
运行`kubectl delete -f dockertest.yaml`可以删除pods与service  
修改dockertest.ymal 中replicas数量后，运行`kubectl apply -f dockertest.yaml`可以扩容或收缩副本数量

到此，k8s部署springboot应用完成。有心得交流的朋友可以私信或留言。

[Link 1]: https://kuboard.cn/install/install-k8s.html#from_org_cn
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190924184822107.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20190924184839478.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20190924185504630.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20190924185701972.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[20190924185804504.png]: https://img-blog.csdnimg.cn/20190924185804504.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20190924190446920.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[dockerharbor]: https://img-blog.csdnimg.cn/2019092419055146.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[getpods]: https://img-blog.csdnimg.cn/20190924191239961.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[pods1]: https://img-blog.csdnimg.cn/20190924191810892.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[pods2]: https://img-blog.csdnimg.cn/20190924191825921.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70
[pods3]: https://img-blog.csdnimg.cn/20190924191844629.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3MDYzNzg1,size_16,color_FFFFFF,t_70