Configuring the SAP Web Dispatcher

The following figure shows how to include the SAP Web Dispatcher as load balancer in the Workload Distribution scenario:

For more information about the SAP Web Dispatcher concept, see the SAP Web Dispatcher documentation.

1. Configure the Web Dispatcher profile and adjust files icrgroups.txt and urlinfo.txt for the zone definition (see the example files at the end of this section).

   icrgroups.txt

   File icrgroups.txt consists of two sections, separated by an empty line.

   Note icrgroups.txt (for n zones)

   version 1.0

   8888888

   J2EE<ClusterID_J2EEDispatcher_1>J2EE<ClusterID_J2EEDispatcher_2>…J2EE<ClusterID_J2EEDispatcher_n>(empty row)<zonealias_1>:J2EE<J2EEDispatcherClusterID_1><zonealias_2>:J2EE<J2EEDispatcherClusterID_2>…(empty row)

   Enter J2EE plus the J2EE dispatcher cluster ID row by row as instance name in the first section of this file.

   The J2EE dispatcher registers itself on the message server with the cluster ID when the J2EE Engine is installed. You can, for example, look for the corresponding cluster ID using the configuration tools.

   Caution

   Make sure that you use the correct notation.

   In the second section of the file, you define a zone alias and assign one or more instances to this zone. You can assign multiple instances to a zone by inserting a comma as separator between the instances, for example:

<zonealias_2>:J2EE<J2EEDispatcherClusterID_2>,J2EE<J2EEDispatcherClusterID_3>,...

urlinfo.txt

File urlinfo.txt consists of 1 section without empty lines.

8PREFIX=/irj~<zonealias_1>/&GROUP=<zonealias_1>&CASE=&VHOST=*.*;&STACK=J2EE8PREFIX=/irj~<zonealias_2>/&GROUP=<zonealias_2>&CASE=&VHOST=*.*;&STACK=J2EE8

PREFIX=/irj~<zonealias_n>/&GROUP=<zonealias_n>&CASE=&VHOST=*.*;&STACK=J2EE8(empty row)

http://host:port/<prefix>/…/…

1. (Optional) If files icrgroups.txt andurlinfo.txt are contained in a directory other than the SAP Web Dispatcher, specify the complete path in the Web Dispatcher profile.

   See also examples for UNIX™ and Windows™.

2. Check if the zone separator is entered for each server node in the J2EE cluster.

   The zone separator is a special symbol that is used in the URL to separate the context nodes of the application from the zone (logon group).

   Tip

   irj~zawhere ~ is the zone separator

   For more information, see Configuring the Zone Separator .