Secure Cluster Mode

Setting	Description
HDFS Namenode	Full URI to the Namenode, e.g., `hdfs://machine.company.com:8020`
Datameer Private Folder	Path to the Datameer user's directory on HDFS
Job Tracker	Hostname and port of the JobTracker e.g., machine.company.com:8020
Datameer Principal	Fully qualified Kerberos principal for the Datameer user, e.g., `user/machine.company.com@COMPANY.COM`
Datameer Principal Keytab Path	Absolute path of the keytab file containing the credentials of the Datameer user, e.g., `/path/to/file.keytab`
Yarn Principal	Fully qualified Kerberos principal for the Namenode service user, user will almost always be `yarn` (e.g., yarn/machine.company.com@COMPANY.COM.) This is the same property as you would configure on the NameNode (i.e., should have the NameNode's hostname.) `yarn.resourcemanager.principal` parameter from the Hadoop configuration.
HDFS Principal	Fully qualified Kerberos principal for the Namenode service user, user is almost always be `hdfs` (e.g., hdfs/machine.company.com@COMPANY.COM). This is the same property as you would configure on the NameNode, (i.e., should have the NameNode's hostname.) `hdfs.namenode.kerberos.principal` parameter from the Hadoop configuration.
Mapred Principal	Fully qualified Kerberos principal for the JobTracker service user, user is almost always be `mapred` (e.g., mapred/machine.company.com@COMPANY.COM) This is the same property as you would configure on the NameNode, (i.e., should have the JobTracker's hostname.) `mapreduce.jobhistory.principal` parameter from the Hadoop configuration.

Creating a Kerberos keytab

To create a keytab file for a Kerberos principal, das/machine.company.com@COMPANY.COM, run the ktuil application on a machine with Kerberos client software and access to the Kerberos realm.

ktutil: addent -password -p das/machine.company.com@COMPANY.COM -k 1 -e des3-cbc-sha1
<ENTER PASSWORD>
ktutil: wkt das.keytab

This action creates a keytab file das.keytab which can now be used to authenticate the Kerberos principal.

Depending on your Kerberos realm's configured encryption types, the values for the -e argument might change. To find the avaliable encryption types look for the libdefaults section in your Kerberos configuration file, usually /etc/krb5.conf:

[libdefaults]
       default_realm = LOCAL.NETWORK
       dns_fallback = no
       noaddresses = TRUE
       default_tgs_enctypes = des3-cbc-sha1
       default_tkt_enctypes = des3-cbc-sha1
       permitted_enctypes = des3-cbc-sha1

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