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16.2. Managing mod_cluster
The
mod_cluster properties provide direct management over how the mod_cluster domain operates. Almost any part of the mod_cluster configuration can be managed through JBoss ON, but two elements are critical for domain behavior:
- How the
mod_clusterdomain handles sticky sessions. Sticky sessions are enabled inmod_clusterby default, but this can be disabled or its behavior can be changed through the configuration properties. - Enabling advertising (multicast).
mod_clustercan send the JBoss information to any VirtualHost configured in the HTTP server. This allows workers to find the cluster and register themselves with the JBoss server dynamically.
Figure 16.3. Setting Server-Level Properties
The server-level operations apply to all web application contexts configured within the
mod_cluster domain. The obvious ones that impact the web application contexts are enabling and disabling all contexts. The other options are used to reset the mod_cluster domain after an error (reset the node) or reload the cluster configuration after making changes to the cluster properties.
Figure 16.4. Running Server-Level Operations
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