ambari/ambari-server/src/main/resources/stacks/HDP/1.3.2/configuration/cluster-env.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
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<configuration>
    <property>
        <name>security_enabled</name>
        <value>false</value>
        <description>Hadoop Security</description>
    </property>
    <property>
        <name>kerberos_domain</name>
        <value>EXAMPLE.COM</value>
        <description>Kerberos realm.</description>
    </property>
    <property>
        <name>ignore_groupsusers_create</name>
        <value>false</value>
        <description>Whether to ignore failures on users and group creation</description>
    </property>
    <property>
        <name>smokeuser</name>
        <value>ambari-qa</value>
        <property-type>USER</property-type>
        <description>User executing service checks</description>
    </property>
    <property>
        <name>smokeuser_keytab</name>
        <value>/etc/security/keytabs/smokeuser.headless.keytab</value>
        <description>Path to smoke test user keytab file</description>
    </property>
    <property>
        <name>user_group</name>
        <value>hadoop</value>
        <property-type>GROUP</property-type>
        <description>Hadoop user group.</description>
    </property>
</configuration>