用 java fabric客户连接 k8s（GKE) 并创建一个deployment

    io.fabric8
    openshift-client
    5.9.0

从$HOME/.kube/目录下获取config文件，放在项目的指定目录下，代码中会用到。

    public static String getAccessToken() throws IOException {
        GoogleCredential credential = GoogleCredential
                .fromStream(new FileInputStream(
                        "src/main/java/xxxxxx.json"))// 加载服务帐户认证文件
                .createScoped(SCOPES);

        // 刷新token
        credential.refreshToken();
        // 获取token
        String preAccessToken1 = credential.getAccessToken();
        System.out.println(preAccessToken1);
        String accessToken  = preAccessToken1.substring(0, preAccessToken1.indexOf(".."));
        System.out.println(accessToken);
        return accessToken;
    }

该 xxxxxx.json 需要从GKE平台下载，即创建GKE集群时候，用的账号，对应的json文件。

public static KubernetesClient getFabricClient(String accessToken) throws IOException {
    File configFile = new File("src/main/java/config");
    final String configYAML = String.join("n", Files.readAllLines(configFile.toPath()));
    Config config = Config.fromKubeconfig(configYAML);
    config.setTrustCerts(true);
    config.setMasterUrl("https://apiserver-ip");
    config.setOauthToken(accessToken);
    KubernetesClient kubernetesClient = new DefaultKubernetesClient(config);
    return kubernetesClient;
}

private static final String NAMESPACE = "HelloKitty";
public static void createDeployment(KubernetesClient client ) {
    Namespace ns = new NamespaceBuilder().withNewmetadata().withName(NAMESPACE).addToLabels("this", "rocks").endmetadata().build();
    logger.info("Created namespace: {}", client.namespaces().createOrReplace(ns));

    ServiceAccount fabric8 = new ServiceAccountBuilder().withNewmetadata().withName("fabric8").endmetadata().build();

    client.serviceAccounts().inNamespace(NAMESPACE).createOrReplace(fabric8);
    try {
        Deployment deployment = new DeploymentBuilder()
                .withNewmetadata()
                .withName("nginx")
                .endmetadata()
                .withNewSpec()
                .withReplicas(1)
                .withNewTemplate()
                .withNewmetadata()
                .addToLabels("app", "nginx")
                .endmetadata()
                .withNewSpec()
                .addNewContainer()
                .withName("nginx")
                .withImage("nginx")
                .addNewPort()
                .withContainerPort(80)
                .endPort()
                .endContainer()
                .endSpec()
                .endTemplate()
                .withNewSelector()
                .addToMatchLabels("app", "nginx")
                .endSelector()
                .endSpec()
                .build();

        deployment = client.apps().deployments().inNamespace(NAMESPACE).create(deployment);
        logger.info("Created deployment: {}", deployment);

        logger.info("Scaling up: {}", deployment.getmetadata().getName());
        client.apps().deployments().inNamespace(NAMESPACE).withName("nginx").scale(2, true);
        logger.info("Created replica sets: {}", client.apps().replicaSets().inNamespace(NAMESPACE).list().getItems());
        // logger.info("Deleting: {}", deployment.getmetadata().getName());
        // client.resource(deployment).delete();
    } finally {
        // client.namespaces().withName(NAMESPACE).delete();
    }
    logger.info("Done.");

}

参考文章1 文章2