1. Prerequisites

In addition to the prerequisites provided here, ensure that you also meet the following prerequisites for secure deployments:

Ensure that the UNIX users (responsible for job submission) have the user ID greater than 1000.

	Note
	We strongly discourage usage of Hadoop service users (hdfs, hbase, hcat, mapred) for submitting jobs. You must instead use separate UNIX users for job submissions.

Download the security policy JAR files:
```
wget http://download.oracle.com/otn-pub/java/jce_policy/6/jce_policy-6.zip
```
Note
These JAR files must be present under $JAVA_HOME/jre/lib/security/s directory
Ensure that you replace the instances of EXAMPLE.COM (under the realm property) in gsInstaller.propertiess file with the actual value of the realm defined in your krb5.conf file.

	Note
	These JAR files must be present under `$JAVA_HOME/jre/lib/security/s` directory