Tomcat7 with enabled JMX opens 2 additional random listening ports

Question

I run Tomcat7 using JDK7 on Centos6. I enable JMX using the following options:

CATALINA_OPTS=\"${CATALINA_OPTS} -Dcom.sun.management.jmxremote -Dcom.sun.mana         


        

Answer 1

You can use Tomcat's JMX Remote Lifecycle Listener which allows fixing the ports used by the JMX/RMI Server.
The JMX Remote Lifecycle Listener allows configuring the following ports:

• rmiRegistryPortPlatform - The port to be used by the JMX/RMI registry for the Platform MBeans. This one should be used instead of the com.sun.management.jmxremote.port system property
• rmiServerPortPlatform - The port to be used by the Platform JMX/RMI server.

In addtions you can configure the useLocalPorts attribute - Should any clients using these ports be forced to use local ports to connect to the the JMX/RMI server.

Notice that this listener requires catalina-jmx-remote.jar to be placed in $CATALINA_HOME/lib. This jar may be found in the extras directory of the binary download area.