Enabling cell affinity

The cell affinity function preserves sessions even in the event of an on demand router (ODR outage when you configure unbridged, on demand router (ODR) topologies.

Before you begin

You can use this feature if you have installed Version 6.0.2.6, or Version 6.1.0.5 or later.

About this task

The cell affinity function prevents the loss of sessions when there are multiple ODRs within multiple, unbridged cells, and the IBM® HTTP Server is configured to forward session traffic, either through load-balancing or failover, to more than one ODR.

Procedure

  1. In the administrative console, select System Administration > Cell > Custom Properties.
  2. Set the custom cell property odrSessionAffinityEnabled to true. See Custom properties for more information.
  3. Configure generic server clusters for other ODR cells. See Defining generic server clusters for remote ODR cells for more information.
  4. If you are configuring a multi-tiered configuration, the ODRs in one tier must be configured and operate independently from the ODRs in the other tiers. See Configuring cell affinity in a multi-tiered environment for more information. Note that you may also optionally perform this step in a single-tiered environment if you simply want to use a cookie name other than ODRSESSIONID.
  5. Generate a plugin-cfg.xml. See Generating a plugin-cfg.xml for more information.
  6. Merge the plugin-cfg.xml files into one plugin-cfg.xml file. See pluginMergebat|.sh script for more information.
  7. Install the new plugin-cfg.xml file on the IBM HTTP server. Refer to Configuring an on demand router to dynamically update the Web server plug-in configuration for more information on how to install a new plugin-cfg.xml file.

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