1. Set up Hadoop Service URLs

To configure access to an internal Hadoop service through the Knox Gateway:

Add the following service for each Hadoop service to the /etc/knox/conf/topologies $cluster-name.xml:
```
<topology>
   <gateway>
     ...
   </gateway>  
  <service>
    <role>$service_name</role>
    <url>$schema://$hostname:$port</url>
  </service>
</topology>
```
where:
- $service_name is either WEBHDFS, WEBHCAT, WEBHBASE, OOZIE, HIVE, NAMENODE, or JOBTRACKER.
- url is complete internal cluster URL required to access the service including the following:
  - $schema is the service protocol.
  - $hostname is the resolvable internal host name.
  - $port is port the service listening port.
Save the file.
The gateway creates a new WAR file with modified timestamp in /var/lib/knox/data/deployments .