Kubernetes 官方 java 客户端之四：内部应用

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>
    <parent>        <groupId>com.bolingcavalry</groupId>        <artifactId>kubernetesclient</artifactId>        <version>1.0-SNAPSHOT</version>        <relativePath>../pom.xml</relativePath>    </parent>
    <groupId>com.bolingcavalry</groupId>    <artifactId>helloworld</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>helloworld</name>    <description>Demo project for Spring Boot</description>    <packaging>jar</packaging>
    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>
        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>
        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>            <optional>true</optional>        </dependency>                <dependency>            <groupId>io.kubernetes</groupId>            <artifactId>client-java</artifactId>        </dependency>
    </dependencies>
    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>                <version>2.3.0.RELEASE</version>                <!--该配置会在jar中增加layer描述文件，以及提取layer的工具-->                <configuration>                    <layers>                        <enabled>true</enabled>                    </layers>                </configuration>            </plugin>        </plugins>    </build>
</project>

package com.bolingcavalry.demo;
import com.google.gson.Gson;import io.kubernetes.client.openapi.ApiClient;import io.kubernetes.client.openapi.Configuration;import io.kubernetes.client.openapi.apis.CoreV1Api;import io.kubernetes.client.openapi.models.V1PodList;import io.kubernetes.client.util.Config;import lombok.extern.slf4j.Slf4j;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;
import java.util.List;import java.util.stream.Collectors;
@SpringBootApplication@RestController@Slf4jpublic class DemoApplication {
    public static void main(String[] args) {        SpringApplication.run(DemoApplication.class, args);    }
    @RequestMapping(value = "/hello")    public List<String> hello() throws Exception {        ApiClient client = Config.defaultClient();        Configuration.setDefaultApiClient(client);
        CoreV1Api api = new CoreV1Api();
        // 调用客户端API取得所有pod信息        V1PodList v1PodList = api.listPodForAllNamespaces(null, null, null, null, null, null, null, null, null);
        // 使用Gson将集合对象序列化成JSON，在日志中打印出来        log.info("pod info \n{}", new Gson().toJson(v1PodList));
        return v1PodList                .getItems()                .stream()                .map(value ->                        value.getMetadata().getNamespace()                        + ":"                        + value.getMetadata().getName())                .collect(Collectors.toList());    }}

# 指定基础镜像，这是分阶段构建的前期阶段FROM openjdk:8u212-jdk-stretch as builder# 执行工作目录WORKDIR application# 配置参数ARG JAR_FILE=target/*.jar# 将编译构建得到的jar文件复制到镜像空间中COPY ${JAR_FILE} application.jar# 通过工具spring-boot-jarmode-layertools从application.jar中提取拆分后的构建结果RUN java -Djarmode=layertools -jar application.jar extract
# 正式构建镜像FROM openjdk:8u212-jdk-stretchWORKDIR application# 前一阶段从jar中提取除了多个文件，这里分别执行COPY命令复制到镜像空间中，每次COPY都是一个layerCOPY --from=builder application/dependencies/ ./COPY --from=builder application/spring-boot-loader/ ./COPY --from=builder application/snapshot-dependencies/ ./COPY --from=builder application/application/ ./ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]

mvn clean package -U -DskipTests

docker build -t 192.168.50.43:5888/common/helloworld:1.0-SNAPSHOT .

apiVersion: v1kind: Servicemetadata:  name: helloworld  namespace : kubernetesclientspec:  type: NodePort  ports:    - port: 8080      nodePort: 30100  selector:    name: helloworld---apiVersion: extensions/v1beta1kind: Deploymentmetadata:  namespace : kubernetesclient  name: helloworldspec:  replicas: 1  template:    metadata:      labels:        name: helloworld    spec:      serviceAccountName: kubernates-client-service-account      containers:        - name: helloworld          image: 192.168.50.43:5888/common/helloworld:1.0-SNAPSHOT          tty: true          livenessProbe:            httpGet:              path: /actuator/health/liveness              port: 8080            initialDelaySeconds: 5            failureThreshold: 10            timeoutSeconds: 10            periodSeconds: 5          readinessProbe:            httpGet:              path: /actuator/health/readiness              port: 8080            initialDelaySeconds: 5            timeoutSeconds: 10            periodSeconds: 5          ports:            - containerPort: 8080          resources:            requests:              memory: "512Mi"              cpu: "100m"            limits:              memory: "1Gi"              cpu: "1000m"