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https://issues.apache.org/jira/browse/HDFS-5804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14077791#comment-14077791
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Jeff Hansen commented on HDFS-5804:
-----------------------------------
I would probably recommend adding a comment to line 77 of
http://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HdfsNfsGateway.apt.vm?view=markup&pathrev=1614125
Specifically:
> The above are the only required configuration for the NFS gateway in
> non-secure mode. However, note that in most cases of non-secure
> installations, you will need to include "root" in the list of users provided
> under `hadoop.proxyuser.nfsserver.groups` as root will generally be the user
> that initially executes the mount.
Thanks Brandon! By the way, I'd like to concede that I may have made commented
(in my stack overflow response) about the lack of certain details in the
documentation that were always there -- as I recall, I was VERY tired and
distracted the first time I went through the instructions and had trouble
concentrating =) When I re-read it, I thought, that's funny, many of those
things that I complained about not being there were in fact there...
> HDFS NFS Gateway fails to mount and proxy when using Kerberos
> -------------------------------------------------------------
>
> Key: HDFS-5804
> URL: https://issues.apache.org/jira/browse/HDFS-5804
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: nfs
> Affects Versions: 3.0.0, 2.2.0
> Reporter: Abin Shahab
> Assignee: Abin Shahab
> Fix For: 3.0.0, 2.4.0
>
> Attachments: HDFS-5804-documentation.patch, HDFS-5804.patch,
> HDFS-5804.patch, HDFS-5804.patch, HDFS-5804.patch, HDFS-5804.patch,
> HDFS-5804.patch, HDFS-5804.patch, exception-as-root.log,
> javadoc-after-patch.log, javadoc-before-patch.log
>
>
> When using HDFS nfs gateway with secure hadoop
> (hadoop.security.authentication: kerberos), mounting hdfs fails.
> Additionally, there is no mechanism to support proxy user(nfs needs to proxy
> as the user invoking commands on the hdfs mount).
> Steps to reproduce:
> 1) start a hadoop cluster with kerberos enabled.
> 2) sudo su -l nfsserver and start an nfs server. This 'nfsserver' account has
> a an account in kerberos.
> 3) Get the keytab for nfsserver, and issue the following mount command: mount
> -t nfs -o vers=3,proto=tcp,nolock $server:/ $mount_point
> 4) You'll see in the nfsserver logs that Kerberos is complaining about not
> having a TGT for root.
> This is the stacktrace:
> java.io.IOException: Failed on local exception: java.io.IOException:
> org.apache.hadoop.security.AccessControlException: Client cannot authenticate
> via:[TOKEN, KERBEROS]; Host Details : local host is:
> "my-nfs-server-host.com/10.252.4.197"; destination host is:
> "my-namenode-host.com":8020;
> at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:764)
> at org.apache.hadoop.ipc.Client.call(Client.java:1351)
> at org.apache.hadoop.ipc.Client.call(Client.java:1300)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
> at com.sun.proxy.$Proxy9.getFileLinkInfo(Unknown Source)
> at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
> at com.sun.proxy.$Proxy9.getFileLinkInfo(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileLinkInfo(ClientNamenodeProtocolTranslatorPB.java:664)
> at org.apache.hadoop.hdfs.DFSClient.getFileLinkInfo(DFSClient.java:1713)
> at
> org.apache.hadoop.hdfs.nfs.nfs3.Nfs3Utils.getFileStatus(Nfs3Utils.java:58)
> at
> org.apache.hadoop.hdfs.nfs.nfs3.Nfs3Utils.getFileAttr(Nfs3Utils.java:79)
> at
> org.apache.hadoop.hdfs.nfs.nfs3.RpcProgramNfs3.fsinfo(RpcProgramNfs3.java:1643)
> at
> org.apache.hadoop.hdfs.nfs.nfs3.RpcProgramNfs3.handleInternal(RpcProgramNfs3.java:1891)
> at
> org.apache.hadoop.oncrpc.RpcProgram.messageReceived(RpcProgram.java:143)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:787)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:281)
> at
> org.apache.hadoop.oncrpc.RpcUtil$RpcMessageParserStage.messageReceived(RpcUtil.java:132)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:787)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
> at
> org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
> at
> org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
> at
> org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:555)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
> at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:107)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:88)
> at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
> at
> org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
> at
> org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
> Caused by: java.io.IOException:
> org.apache.hadoop.security.AccessControlException: Client cannot authenticate
> via:[TOKEN, KERBEROS]
> at org.apache.hadoop.ipc.Client$Connection$1.run(Client.java:620)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
> at
> org.apache.hadoop.ipc.Client$Connection.handleSaslConnectionFailure(Client.java:583)
> at
> org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:667)
> at org.apache.hadoop.ipc.Client$Connection.access$2600(Client.java:314)
> at org.apache.hadoop.ipc.Client.getConnection(Client.java:1399)
> at org.apache.hadoop.ipc.Client.call(Client.java:1318)
> ... 43 more
> Caused by: org.apache.hadoop.security.AccessControlException: Client cannot
> authenticate via:[TOKEN, KERBEROS]
> at
> org.apache.hadoop.security.SaslRpcClient.selectSaslClient(SaslRpcClient.java:170)
> at
> org.apache.hadoop.security.SaslRpcClient.saslConnect(SaslRpcClient.java:387)
> at
> org.apache.hadoop.ipc.Client$Connection.setupSaslConnection(Client.java:494)
> at org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:314)
> at org.apache.hadoop.ipc.Client$Connection$2.run(Client.java:659)
> at org.apache.hadoop.ipc.Client$Connection$2.run(Client.java:655)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
> at
> org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:654)
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