Create a configuration file in XML that specifies registrations. See $GLOBUS_LOCATION/etc/globus_wsrf_mds_aggregator/example-aggregator-registration.xml for several specific examples. The configuration file is described in more detail below.
Run mds-servicegroup-add(1) to perform the registrations specified in that configuration file. For example, to register to the DefaultIndexService with a modified example-aggregator-registration.xml file, you could run a command similar to the following:
```
$GLOBUS_LOCATION/bin/mds-servicegroup-add -s \
https://127.0.0.1:8443/wsrf/services/DefaultIndexService \
$GLOBUS_LOCATION/etc/globus_wsrf_mds_aggregator/example-aggregator-registration.xml
```
- Each registration has a limited lifetime; mds-servicegroup-add should be left running in the background so that it can continue to refresh registrations.
- Depending on administration preference, it may be run on the same host as the aggregator service, on the same host as a member resource, or on any other host(s).

The configuration file consists of an optional defaultServiceGroupEPR, an optional defaultRegistrantEPR, and then one or more ServiceGroupRegistrationParameters blocks, each of which represents one registration.

You can use the example configuration at $GLOBUS_LOCATION/etc/globus_wsrf_mds_aggregator/example-aggregator-registration.xml, replacing the EPRs in that file with the EPRs for your resources. It includes many examples of configurations for GRAM, RFT and other situations.

The general syntax of the configuration file is:


<?xml version="1.0" encoding="UTF-8" ?>
<ServiceGroupRegistrations
  xmlns="http://mds.globus.org/servicegroup/client">

  // An optional default service group EPR.
  <defaultServiceGroupEPR>
    // Default service group EPR
  </defaultServiceGroupEPR>

  // An optional default registrant EPR.
  <defaultRegistrantEPR>
    // Default registrant EPR
  </defaultRegistrantEPR>

  // An optional default security descriptor file.
  <defaultSecurityDescriptorFile>
    // Path name of default security descriptor file
  </defaultSecurityDescriptorFile>

  // One or more service group registration blocks:

  <ServiceGroupRegistrationParameters>
    <ServiceGroupEPR>
      // EPR of the service group to register to
    </ServiceGroupEPR>
    <RegistrantEPR>
      // EPR of the entity to be monitored.
    </RegistrantEPR>
    <InitialTerminationTime>
      // Initial termination time
    </InitialTerminationTime>
    <RefreshIntervalSecs>
      // Refresh interval, in seconds
    </RefreshIntervalSecs>
    <Content type="agg:AggregatorContent">
      // Aggregator-source-specific configuration parameters
    </Content>
  </ServiceGroupRegistrationParameters>

</ServiceGroupRegistrations>

The following table describes the different blocks of the file and any parameters:

Table 1. Aggregator configuration parameters

`defaultServiceGroupEPR` block	Provides a convenient way to register a number of resources to a single service group -- for example, if you wish to register several resources to your default VO index, you can specify that index as the default service group and omit the `ServiceGroupEPR` blocks from each `ServiceGroupRegistrationParameters` block.
`defaultRegistrantEPR`	Provides a convenient way to register a single resource to several service groups -- for example, if you wish to register your local GRAM server to several index servers, you can specify your GRAM server as the default registrant and omit the `RegistrantEPR` blocks from each `ServiceGroupRegistrationParameters` block.
`defaultSecurityDescriptorFile`	Simply the path to the security descriptor file.
`ServiceGroupRegistrationParameters`	Each `ServiceGroupRegistrationParameters` block specifies the parameters used to register a resource to a service group. The parameters specified in this block are:
`ServiceGroupEPR`	The EPR of the service group to register to. This parameter may be omitted if a `defaultServiceGroupEPR` block is specified; in this case, the value of `defaultServiceGroupEPR` will be used instead.
`RegistrantEPR`	The EPR of the resource to register. This parameter may be omitted if a `defaultRegistrantEPR` block is specified; in this case, the value of `defaultRegistrantEPR` will be used instead.
`InitialTerminationTime`	The initial termination time of this registration (this may be omitted). If the initial termination time is omitted, then the mds-servicegroup-add sets the initial termination time to the current wall time plus 2 times that of the specified `RefreshIntervalSecs` parameter.
`RefreshIntervalSecs`	The refresh interval of the registration, in seconds. The mds-servicegroup-add(1) will attempt to refresh the registration according to this interval, by default incrementing the termination time of the registration by 2 times this interval for every successful refresh. If at any point the termination time for the registration expires the registration will be subject to removal within a maximum of 5 minutes.
`Content`	Aggregator-source-specific registration parameters. The content blocks for the various aggregator sources are described in detail in the following sections.

2. Further configuration

Further configuration information is detailed per source: QueryAggregatorSource, SubscriptionAggregatorSource, and ExecutionAggregatorSource.

	Note
	Using the ExecutionAggregatorSource also requires configuring the executable itself, which is also covered in the ExecutionAggregatorSource section.

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