Red Hat Summit4.3. Components
Proxy Server
On the proxy server, the JBoss HTTP Connector mod-cluster consists of four Apache modules.
| Component | Description |
|---|---|
mod_slotmem.so | The Shared Memory Manager module shares the real time worker node information with multiple Apache server processes |
mod_manager.so |
The Cluster Manager module receives and acknowledges messages from nodes, including worker node registrations, worker node load data, and worker node application life cycle events
|
mod_proxy_cluster.so | The Proxy Balancer Module handles request routing to cluster nodes. The Proxy Balancer selects the appropriate destination node based on application location in the cluster, current state of each of the cluster nodes, and the Session ID (if a request is part of an established session). |
mod_advertise.so |
The Proxy Advertisement Module broadcasts the existence of the proxy server via UDP multicast messages. The server advertisement messages contain the IP address and port number where the proxy is listening for responses from nodes that want to join the load-balancing cluster.
|
see Section 5.1.1, “Apache Modules” for detailed information about the available modules including user-configurable parameters.
Worker Node Components
Worker Node Service
The
mod_cluster offered as part of JBoss Enterprise Web Server is used instead of a JBoss HTTP Connector client service for the worker node service. The mod_cluster in JBoss Enterprise Web Server consists of the following two parts:
- Native - Apache HTTP Server module (balancer logic)
- Java - Tomcat6/7 Listener library (worker logic)
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