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How do I grant a user permission to use Hadoop via Kerberos?

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http://serverfault.com – I've setup Hadoop to use Kerberos (following the Cloudera security guide), but it is unclear how I connect to hadoop with regular users (e.g. username=myuser). Currently I have myself authenticated with Kerberos with my Keberos admin user (via kinit kerbadmin/admin), but that doesn't seem to help. Do I need to tell Hadoop that kerberos user "kerbadmin" is allowed to use Hadoop? Running something like hadoop fs -ls / results in a permission issue: 11/09/13 11:13:03 WARN ipc.Client: Exception encountered while connecting to the server : javax.security.sasl.SaslException: GSS initiat (HowTos)