The Data Node fails to start with the following error: ERROR datanode.DataNode (DataNode.java:secureMain(2692)) - Exception in secureMain java.io.IOException: Login failure for dn/sandbox-hdp.hortonworks.com@HADOOP.COM from keytab /etc/security/keytabs/dn.service.keytab: javax.security.auth.login.LoginException: Receive timed out at org.apache.hadoop.security.UserGroupInformation.loginUserFromKeytab(UserGroupInformation.java:1098) at org.apache.hadoop.security.SecurityUtil.login(SecurityUtil.java:307) at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2491) at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2540) at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:2685) at org.apache.hadoop.hdfs.server.datanode.SecureDataNodeStarter.start(SecureDataNodeStarter.java:77) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.commons.daemon.support.DaemonLoader.start(DaemonLoader.java:243) Caused by: javax.security.auth.login.LoginException: Receive timed out at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:808) at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:617) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755) at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195) at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682) at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680) at javax.security.auth.login.LoginContext.login(LoginContext.java:587) at org.apache.hadoop.security.UserGroupInformation.loginUserFromKeytab(UserGroupInformation.java:1089) ... 10 more Caused by: java.net.SocketTimeoutException: Receive timed out at java.net.PlainDatagramSocketImpl.receive0(Native Method) at java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:143) at java.net.DatagramSocket.receive(DatagramSocket.java:812) at sun.security.krb5.internal.UDPClient.receive(NetClient.java:206) at sun.security.krb5.KdcComm$KdcCommunication.run(KdcComm.java:411) at sun.security.krb5.KdcComm$KdcCommunication.run(KdcComm.java:364) at java.security.AccessController.doPrivileged(Native Method) at sun.security.krb5.KdcComm.send(KdcComm.java:348) at sun.security.krb5.KdcComm.sendIfPossible(KdcComm.java:253) at sun.security.krb5.KdcComm.send(KdcComm.java:229) at sun.security.krb5.KdcComm.send(KdcComm.java:200) at sun.security.krb5.KrbAsReqBuilder.send(KrbAsReqBuilder.java:316) at sun.security.krb5.KrbAsReqBuilder.action(KrbAsReqBuilder.java:361) at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:776) ... 23 more 2018-09-19 07:23:44,416 INFO util.ExitUtil (ExitUtil.java:terminate(124)) - Exiting with status 1 2018-09-19 07:23:44,419 INFO datanode.DataNode (LogAdapter.java:info(47)) - SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down DataNode at sandbox-hdp.hortonworks.com/172.17.0.2 I implemented Kerberos from the Ambari UI. But after Kerberos is enbaled, I am not able to start the datanode. I checked on google for the error, found some solutions like: 1. Adding the following parameter to krb5.conf under the [libdefaults] section: udp_preference_limit = 1. 2 .Checking the hdfs-site.xml file which has entry : <property> <name>dfs.datanode.kerberos.principal</name> <value>dn/_HOST@HADOOP.COM</value> </property> <property> <name>dfs.datanode.keytab.file</name> <value>/etc/security/keytabs/dn.service.keytab</value> </property> 3. Executing klint: # kinit -V -k -t /etc/security/keytabs/dn.service.keytab dn/sandbox-hdp.hortonworks.com@HADOOP.COM Using default cache: /tmp/krb5cc_0 Using principal: dn/sandbox-hdp.hortonworks.com@HADOOP.COM Using keytab: /etc/security/keytabs/dn.service.keytab Authenticated to Kerberos v5 4. Result of cat /etc/hosts : 127.0.0.1 localhost 172.17.0.2 sandbox-hdp.hortonworks.com sandbox-hdp 127.0.0.1 sandbox.hortonworks.com Do I need to do any additional things for kerberos apart from configuring through Ambari UI? ... View more