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 3.2. Creating Keytab files

Step 1: As the root user, start the kadmin tool on the KDC server: 

/usr/krb5/sbin/kadmin.local
kadmin.local:

Step 2: Create the keytab files for all services in your Hadoop cluster.

  1. Use kadmin utility to execute the following: 

    kadmin: xst -norandkey -k $keytab_file_name $principal_name/fully.qualified.domain.name

    The $keytab_file_name must use the following mandatory naming conventions:

    Table 5.17. Secure deployment - Mandatory naming conventions for keytab files
    Service Name Keytab File Name Principal Name Permissions Owner
    NameNode nn.service.keytab nn 700 hdfs:hadoop
    NameNode spnego.service.keytab HTTP 700 hdfs:hadoop
    Secondary NameNode nn.service.keytab nn 700 hdfs:hadoop
    Secondary NameNode spnego.service.keytab HTTP 700 hdfs:hadoop
    JobTracker jt.service.keytab jt 700 mapred:hadoop
    TaskTracker tt.service.keytab tt 700 mapred:hadoop
    DataNode dn.service.keytab dn 700 hdfs:hadoop
    HBase Master hm.service.keytab hm 700 hbase:hadoop
    HBase RegionServer rs.service.keytab rs 700 hbase:hadoop
    Hive Metastore hive.service.keytab hive 700 hive:hadoop
    Oozie oozie.service.keytab oozie 700 oozie:hadoop
    Oozie spnego.service.keytab HTTP 700 oozie:hadoop
    WebHCat spnego.service.keytab HTTP 700 webhcat:hadoop

    For example, to create NameNode principals' (nn, host, and HTTP) keytab files, execute the following commands: 

    kadmin: xst -k nn.service.keytab nn/NAMENODE
kadmin: xst -k spnego.service.keytab HTTP/NAMENODE

  2. On each of the node in your cluster, change directory to the $keytab directory.

    [Note]Note

    The location is specified by the keytabdirproperty in the gsInstaller.properties file

  3. Copy the appropriate keytab file on each of node in your cluster.

Step 3: Follow the steps listed in Step - 2 above, to create keytab files according to the following mandatory naming conventions:

Table 5.18. Secure deployment - Mandatory naming conventions for HDFS and Smoke test users' keytab files
User Name Principal Name (mandatory naming convention)
HDFS User Value specified for hdfsuser.headless.keytab property in master-install-location/gsInstaller/gsInstaller.properties file.
Smoke Test User Value specified for smoke_test_user.headless.keytab property in master-install-location/gsInstaller/gsInstaller.properties file.

Step 4: Use the klist utlity on each of your service to verify that the correct keytab files and principals are associated with the correct service. For example, to verify the keytabs for the NameNode, execute the following command: 

klist –k -t /etc/security/nn.service.keytab

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