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
- In the administrative console, select System Administration
> Cell > Custom Properties.
- Set the custom cell property odrSessionAffinityEnabled
to true. See Custom properties
for more information.
- Configure generic server clusters for other ODR cells.
See Defining generic server clusters for remote ODR cells
for more information.
- 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.
- Generate a plugin-cfg.xml. See Generating a plugin-cfg.xml
for more information.
- Merge the plugin-cfg.xml files into
one plugin-cfg.xml file. See pluginMergebat|.sh script
for more information.
- 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.