java 连接kerberos hadoop

要在Java中连接Kerberos Hadoop，首先需要使用Kerberos认证来访问Hadoop集群。这需要在Java代码中配置Kerberos认证，以便将用户凭据传递给Hadoop集群。

首先，需要配置Jaas文件来指定Kerberos认证的配置信息。在Java代码中，可以使用`LoginContext`类来加载Jaas文件，并进行Kerberos认证。

其次，需要创建一个`UserGroupInformation`对象，用于传递用户的身份和凭据信息。可以通过调用`UserGroupInformation`类的`loginUserFromKeytab`或者`loginUserWithSubject`方法来使用Kerberos凭据进行认证。这将获取Kerberos的票据，并将其用于与Hadoop集群的通信。

最后，可以使用`UserGroupInformation`对象来连接Hadoop集群，并执行相关操作，如读取、写入HDFS文件，提交MapReduce作业等。在执行这些操作时，Hadoop集群将使用Kerberos票据来验证用户的身份和权限。

总之，在Java代码中连接Kerberos Hadoop需要通过配置Jaas文件，使用`UserGroupInformation`来传递用户的Kerberos凭据，以及使用Kerberos票据来访问Hadoop集群。这样就可以在Java中使用Kerberos认证来连接Hadoop集群，并进行相应的操作。

相关问题

java api连接kerberos认证的es

要使用Java API连接使用Kerberos认证的Elasticsearch集群，你需要遵循以下步骤：

1. 首先，你需要为你的Java应用程序配置Kerberos认证。这可以通过在你的应用程序中使用JAAS（Java Authentication and Authorization Service）框架来完成。

2. 然后，你需要在Elasticsearch集群中启用Kerberos认证。这可以通过在elasticsearch.yml配置文件中设置以下属性来完成：

xpack.security.authc.realms:
  kerberos.kerb1:
    type: kerberos
    order: 0
    krb5_file_path: /path/to/krb5.conf
    keytab_path: /path/to/elasticsearch.keytab

其中，`krb5_file_path`是指向Kerberos配置文件的路径，`keytab_path`是指向Elasticsearch服务的keytab文件路径。

3. 接下来，你需要使用Java API创建一个Elasticsearch客户端，并使用Kerberos认证进行身份验证。以下是一个示例代码：

public class KerberosESClient {
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        conf.setBoolean("hadoop.security.authentication", true);
        UserGroupInformation.setConfiguration(conf);
        UserGroupInformation.loginUserFromKeytab("your_principal", "/path/to/your/keytab");
        Settings settings = Settings.builder()
                .put("cluster.name", "your_cluster_name")
                .put("xpack.security.user", "your_username:your_password")
                .put("client.transport.sniff", true)
                .build();
        TransportClient client = new PreBuiltXPackTransportClient(settings)
                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("your_es_host"), 9300));
        SearchResponse response = client.prepareSearch().execute().actionGet();
        client.close();
    }
}

在上面的代码中，`UserGroupInformation`类用于从指定的keytab文件中获取Kerberos凭证，然后使用这些凭证创建一个Elasticsearch客户端。`Settings`类用于配置一些连接参数，例如集群名称、节点授权信息等。`TransportClient`类用于实现与Elasticsearch节点的通信，可以使用`prepareSearch`方法发送一个查询请求并获取结果。

希望这个回答能够帮助到你！

java api连接kerberos认证的es 生成一个demo，要求使用最新的java api

好的，我可以为您提供一个 Java API 连接 Kerberos 认证的 Elasticsearch 的示例代码。

首先，您需要在 Maven 项目中添加以下 Elasticsearch 和 Kerberos 相关的依赖：

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-client</artifactId>
    <version>7.15.1</version>
</dependency>

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.15.1</version>
</dependency>

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-to-slf4j</artifactId>
    <version>2.14.1</version>
</dependency>

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.14.1</version>
</dependency>

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.14.1</version>
</dependency>

<dependency>
    <groupId>com.sun.security.auth.module</groupId>
    <artifactId>jaas</artifactId>
    <version>1.8.0_212</version>
</dependency>

<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-common</artifactId>
    <version>3.3.1</version>
</dependency>

<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-auth</artifactId>
    <version>3.3.1</version>
</dependency>

接下来，您需要创建一个 `RestHighLevelClient` 对象并为其配置 Kerberos 认证，示例代码如下：

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.UserGroupInformation;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.sniff.Sniffer;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.ThreadContext;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.elasticsearch.xpack.core.security.authc.support.UsernamePasswordToken;
import org.elasticsearch.xpack.security.authc.AuthenticationToken;
import org.elasticsearch.xpack.security.authc.support.DefaultAuthenticationFailureHandler;
import org.elasticsearch.xpack.security.authc.support.UsernamePasswordToken;
import org.elasticsearch.xpack.security.transport.netty4.SecurityNetty4Transport;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.security.PrivilegedAction;
import java.util.concurrent.TimeUnit;

public class ElasticsearchKerberosClient {

    private final String clusterName;
    private final String[] nodeIps;
    private final String realm;
    private final String username;
    private final String password;
    private final String serviceName;
    private final String keytabPath;

    private RestHighLevelClient client;
    private Sniffer sniffer;

    public ElasticsearchKerberosClient(String clusterName, String[] nodeIps, String realm, String username, String password, String serviceName, String keytabPath) {
        this.clusterName = clusterName;
        this.nodeIps = nodeIps;
        this.realm = realm;
        this.username = username;
        this.password = password;
        this.serviceName = serviceName;
        this.keytabPath = keytabPath;
    }

    public void init() throws Exception {
        final Configuration conf = new Configuration();
        conf.set("hadoop.security.authentication", "Kerberos");

        UserGroupInformation.setConfiguration(conf);
        UserGroupInformation.loginUserFromKeytab(username, keytabPath);

        final Settings settings = Settings.builder()
                .put("cluster.name", clusterName)
                .put("xpack.security.user", username + ":" + password)
                .put(SecurityNetty4Transport.SSL_KEYSTORE_PASSWORD_SETTING.getKey(), password)
                .put(SecurityNetty4Transport.SSL_TRUSTSTORE_PASSWORD_SETTING.getKey(), password)
                .put(SecurityNetty4Transport.SSL_KEYSTORE_PATH_SETTING.getKey(), "path/to/keystore.jks")
                .put(SecurityNetty4Transport.SSL_TRUSTSTORE_PATH_SETTING.getKey(), "path/to/truststore.jks")
                .put(SecurityNetty4Transport.SSL_KEYSTORE_TYPE_SETTING.getKey(), "JKS")
                .put(SecurityNetty4Transport.SSL_TRUSTSTORE_TYPE_SETTING.getKey(), "JKS")
                .put(SecurityNetty4Transport.SSL_HTTP_ENABLED_SETTING.getKey(), true)
                .put(SecurityNetty4Transport.SSL_TRANSPORT_ENABLED_SETTING.getKey(), true)
                .put(SecurityNetty4Transport.SSL_KEYSTORE_KEY_PASSWORD_SETTING.getKey(), password)
                .put("xpack.security.transport.ssl.verification_mode", "certificate")
                .put("xpack.security.transport.ssl.enabled", true)
                .put("xpack.security.authc.token.enabled", true)
                .put("xpack.security.authc.realms.kerberos.krb5.files", "/etc/krb5.conf")
                .put("xpack.security.authc.realms.kerberos.krb5.service_name", serviceName)
                .put("xpack.security.authc.realms.kerberos.acceptor_principal", "HTTP/_HOST@REALM")
                .build();

        final RestClient restClient = RestClient.builder(
                new HttpHost(nodeIps[0], 9200, "https"),
                new HttpHost(nodeIps[1], 9200, "https"),
                new HttpHost(nodeIps[2], 9200, "https"))
                .setHttpClientConfigCallback(httpClientBuilder -> {
                    httpClientBuilder.disableAuthCaching();
                    return httpClientBuilder;
                })
                .setRequestConfigCallback(requestConfigBuilder ->
                        requestConfigBuilder.setConnectTimeout((int) TimeUnit.MINUTES.toMillis(1))
                                .setConnectionRequestTimeout((int) TimeUnit.MINUTES.toMillis(1))
                                .setSocketTimeout((int) TimeUnit.MINUTES.toMillis(1)))
                .build();

        final ThreadContext threadContext = new ThreadContext(settings);
        final DefaultAuthenticationFailureHandler failureHandler = new DefaultAuthenticationFailureHandler(settings, threadContext);
        final Sniffer sniffer = Sniffer.builder(restClient)
                .setSniffIntervalMillis(30000)
                .setFailureListener(new Sniffer.FailureListener() {
                    @Override
                    public void onFailure(TransportAddress address) {
                        if (address != null) {
                            failureHandler.authenticationFailed(address.toString(), null);
                        }
                    }
                })
                .build();
        this.sniffer = sniffer;

        final RestHighLevelClient client = new RestHighLevelClient(restClient) {
            @Override
            public AuthenticationToken authenticate(AuthenticationToken token) {
                if (token instanceof UsernamePasswordToken) {
                    final UsernamePasswordToken upToken = (UsernamePasswordToken) token;
                    final String upTokenUsername = upToken.username();
                    final String upTokenPassword = new String(upToken.credentials().clone());

                    return new UsernamePasswordToken(upTokenUsername, upTokenPassword.toCharArray());
                } else {
                    return token;
                }
            }
        };
        this.client = client;
    }

    public void close() {
        try {
            if (client != null) {
                client.close();
            }
            if (sniffer != null) {
                sniffer.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public RestHighLevelClient getClient() {
        return client;
    }

    public static void main(String[] args) throws Exception {
        final String clusterName = "elasticsearch";
        final String[] nodeIps = {"127.0.0.1", "127.0.0.2", "127.0.0.3"};
        final String realm = "YOUR-REALM.COM";
        final String username = "YOUR-USERNAME";
        final String password = "YOUR-PASSWORD";
        final String serviceName = "elasticsearch";
        final String keytabPath = "/path/to/keytab";

        final ElasticsearchKerberosClient esClient = new ElasticsearchKerberosClient(clusterName, nodeIps, realm, username, password, serviceName, keytabPath);
        esClient.init();

        final RestHighLevelClient client = esClient.getClient();
        // TODO: 使用 client 对象进行 Elasticsearch 查询操作

        esClient.close();
    }

}

请根据您的实际情况，修改示例代码中的参数和配置。