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1. Clustering & Load Balancing
   Clustering allows an application server to support multiple nodes with failover, session data sharing, and load balancing across many network nodes. Load balancing of the application can be done with the help of inbuilt support of Apache server. For detailed information on Clustering please refer Performance and High Availability section.
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2. SSL Encoder
   The advantages of Web server proxies are that they offer a way to get server affinity for SSL-encrypted messages, without any extra hardware. But extensive SSL processing puts an extra load on the proxy. It will be handled by Apache server while Geronimo can handle business logic of the application.
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3. Application Load Sharing
   In many serving systems, Apache and Geronimo servers work together to handle all HTTP requests. Apache handles the request for static pages (including HTML, JPEG, and GIF files), while Geronimo handles requests for dynamic pages (JSPs or servlets) with the help of Tomcat/Jetty. Geronimo servers can also handle static pages, but in combined systems, they're usually set up to handle dynamic requests.
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Summary

Using the Geronimo application server lets you build a secure enterprise infrastructure conforming to the latest standards and requirements.This article gave you an insight into custom configuration of the standard Geronimo installation, with several installation methods.