Enable 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.

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.

  1. In the console, select System administration > Cell > Custom properties.

  2. Set the custom cell property odrSessionAffinityEnabled to true. For more information read about custom properties.

  3. Configure generic server clusters for other ODR cells. For more information, read about defining generic server clusters for remote ODR cells.

  4. If we are configuring a multi-tiered configuration, the ODRs in one tier must be configured and operate independently from the ODRs in the other tiers. For more information read about configuring cell affinity in a multi-tiered environment. Note that we can 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.

  6. Merge the plugin-cfg.xml files into one plugin-cfg.xml file. For more information, read about the pluginmerge.bat or pluginmerge.sh script.

  7. Install the new plugin-cfg.xml file on the IBM HTTP server. For more information on how to install a new plugin-cfg.xml file, read about configuring an ODR to dynamically update the web server plug-in configuration.


Subtopics


Related concepts

  • Intelligent Management: custom properties
  • Cell affinity function


    Related tasks

  • Use generic server clusters with cell affinity
  • Create ODRs
  • Configure an ODR to dynamically update the web server plug-in configuration
  • Generating a plugin-cfg.xml
  • Configure cell affinity in a multi-tiered environment
  • Configure ODRs

  • pluginMerge script