K8S官方java sdk与fabric8 sdk

文章目录

1、版本选择
[2、k8s官方Java sdk测试](#2、k8s官方Java sdk测试)
[3、fabric8 sdk测试](#3、fabric8 sdk测试)
4、总结

1、版本选择

spring-cloud-kubernetes同时支持了k8s官方的java client sdk,以及fabric8的client sdk。直接选用它引入的版本(如下)就OK,避免一些兼容性坑，适合本地虚拟机的k8s v1.19.16版本应该正好OK。

pom 复制代码

      <dependency>
            <groupId>io.kubernetes</groupId>
            <artifactId>client-java</artifactId>
            <version>19.0.1</version>
        </dependency>

pom 复制代码

        <dependency>
            <groupId>io.fabric8</groupId>
            <artifactId>kubernetes-client</artifactId>
            <version>6.13.4</version>
        </dependency>

也可以直接使用以下pom配置锁定版本

pom 复制代码

 <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>3.2.9</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>2023.0.3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!--<dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${project.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>-->
        </dependencies>
    </dependencyManagement>

IDEA运行配置使用远程Java环境，也就是k8s master节点进行执行，因为创建client对象默认需要加载~/.kube/config认证信息以访问k8s apiserver

2、k8s官方Java sdk测试

官方sdk监听pod测试

java 复制代码

package com.example.myk8s.demo;

import com.google.gson.reflect.TypeToken;
import io.kubernetes.client.openapi.Configuration;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1Pod;
import io.kubernetes.client.util.Config;
import io.kubernetes.client.util.Watch;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;


@Slf4j
public class k8sOfficePodWatcher {
    @SneakyThrows
    public static void main(String[] args) {
        Configuration.setDefaultApiClient(Config.defaultClient());
        CoreV1Api api = new CoreV1Api();
        Watch<V1Pod> watch = Watch.createWatch(
                api.getApiClient(),
                api.listNamespacedPodCall("default", null, null, null, null, null, null, null, null, null, null, true, null),
                new TypeToken<Watch.Response<V1Pod>>() {
                }.getType()
        );
        watch.forEach(event -> {
            System.out.println(event.type);
            switch (event.type) {
                case "ADDED" -> log.info("Pod created: {}", event.object.getMetadata().getName());
                case "MODIFIED" -> log.info("Pod modified: {}", event.object.getMetadata().getName());
                case "DELETED" -> log.info("Pod deleted: {}", event.object.getMetadata().getName());
                default -> log.info("Unhandled event type: {}", event.type);
            }
        });
    }
}

3、fabric8 sdk测试

fabric8 sdk监听pod测试

java 复制代码

package com.example.myk8s.demo;

import io.fabric8.kubernetes.api.model.Pod;
import io.fabric8.kubernetes.client.*;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class k8sFabric8PodWatcher {

    public static void main(String[] args) {
        Config config = new ConfigBuilder().build();
        KubernetesClient client = new KubernetesClientBuilder().withConfig(config).build();
        client.pods().inNamespace("default").watch(new Watcher<Pod>() {
            @Override
            public void eventReceived(Action action, Pod pod) {
                switch (action) {
                    case ADDED -> log.info("Pod created: {}", pod.getMetadata().getName());
                    case MODIFIED -> log.info("Pod modified: {}", pod.getMetadata().getName());
                    case DELETED -> log.info("Pod deleted: {}", pod.getMetadata().getName());
                    default -> log.info("Unhandled event type: {} for pod {}", action, pod.getMetadata().getName());
                }
            }

            @Override
            public void onClose(WatcherException cause) {
                if (cause != null) {
                    log.error("Watch closed due to an error: {}", cause.getMessage());
                } else {
                    log.info("Watch closed normally.");
                }
            }
        });
    }
}

4、总结

1、官方sdk提供Java，go，python等多种语言版本，fabric8仅Java

2、官方sdk api稍难用一点，fabric8有更友好的api,比如基于fabric8 的创建出来的client对象可以直接操作各种资源，且大量使用builder模式构建参数对象，基本不用看文档就能玩。

3、fabric8内置了更多的高级功能，比如模拟框架、更简单的配置选项以及更好的错误处理机制，支持自定义资源定义，并且更容易集成到 CI/CD 流程中。

fabric8官方入口
 fabric8文档