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Changing the default port numbers
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The config-substitutions.properties file lets you specify a totally new set of ports and define an automatic port offset for when you run multiple servers (or instances of the same server).
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For example, an entry such as hostName=localhost can be overridden by an environment variable or system property org.apache.geronimo.config.substitution.hostName=foo.
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The following example shows the config-substitutions.properties file for the Tomcat distribution of Geronimo. The file provided with the Jetty distribution is nearly identical. Changes to the file should be made when the server is stopped.
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There are a number of reasons why you might want to use other port numbers than those provided by default. Most common startup problems are in fact associated with port conflicts. You can use monitoring utilities like Active Ports that will quickly tell you what application or process is using what port so you can customize Geronimo's ports accordingly. On Unix-like platforms, you can always use something like netstat -nao | grep -i list to get the ports in use along with what application is holding that port. Alternatively, you can use netstat -nab on a Windows platform.