Setting Up a Hostmap Provider

Add the hostmap provider to the cluster topology descriptor and a parameter for each DataNode in the cluster, as follows:

Open the cluster topology descriptor file, $cluster-name.xml, in a text editor.
Add the Hostmap provider to topology/gateway using the following format:
```
<provider>
    <role>hostmap</role>
    <name>static</name>
    <enabled>true</enabled>
    <param>
        <name>$external-name</name>
        <value>$internal-dn-host</value>
    </param>
</provider>
```
where:
- $cluster-name.xml is the name of the topology descriptor file, located in $gateway /conf/topologies.
- $external-name is the value that the gateway uses to replace $internal_host host names in responses.
- $internal-dn-host is a comma-separated list of host names that the gateway will replace when rewriting responses.
To the hostmap provider, add a param for each additional DataNode in your cluster:
<param> <name> $external-name2 </name> <value> $internal-dn2-host</value> </param>
Save the file.
Saving the results automatically deploys the topology with the change. The result is the creation of a new WAR file with modified timestamp in $gateway/data/deployments.