1. Setting up Hadoop Service URLs

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

Edit $gateway/conf/topologies$cluster-name.xml to add an entry similar to the following, for each Hadoop service:
```
<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 the complete internal cluster URL required to access the service, including:
  - $schema -- the service protocol
  - $hostname -- the resolvable internal host name
  - $port -- the service listening port
Save the file.
The gateway creates a new WAR file with modified timestamp in $gateway/data/deployments.
Note
It is not necessary to restart the Knox server after making changes to the topology/Hadoop Cluster services.

	Note
It is not necessary to restart the Knox server after making changes to the topology/Hadoop Cluster services.