Configure cell affinity in a multi-tiered environment
We can configure the network to contain multiple tiers of on demand routers (ODRs). In multi-tiered environments, configure the ODRs to have unique ODRSESSIONIDs for the different tiers.
We must enable cell affinity and configure the ODRs.
An example environment for configuring cell affinity might include a cluster of ODRs that distribute load to multiple IBM Portal application servers at the front end of the network, while at the back end there are clusters of ODRs that distribute load to multiple Web content managers.
There are three important configuration requirements for this task:
- Within a tier, any generic server cluster configurations we create for cell affinity must refer only to ODRs within that tier.
- Within a tier, the ODR session identifier cookie name, named ODRSESSIONID by default, must be unique for all the other tiers. Configure this cookie name as a custom property on each ODR within that tier.
- If we are using the highly available plugin configuration generator, each plugin-cfg.xml configuration must define the ODR session identifier cookie name to use the IBM HTTP Server to configure ODR affinity. To define the ODR session identifier cookie name, define an additional cell-wide custom property associated with the plugin-cfg.xml generation configuration:
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ODCPluginCfgOdrSessionIdCookie_<configname>=CookieName>
Set ODR session identifier cookie name
- From the administrative console, select...
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Servers | Server types | On demand routers | odr_name | On demand router properties | On demand router settings | Custom properties | New
- Set...
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odrSessionIdCookieName = new_cookie_name
For example, ODRSID_TIER1.
- Repeat for every ODR within the tier.