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POTomcat 6, JMX and the dynamic port problem
 

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  1. POTomcat 6, JMX and the dynamic port problem
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    <p>after reading and trying a lot around, I have to ask if anyone has a solution for my problem.</p> <p>I am trying to set up some Tomcats (V6) behind a firewall. This is no big deal - but I want to monitor them via JMX.</p> <p>I read the TC docu and came across the <a href="http://tomcat.apache.org/tomcat-6.0-doc/config/listeners.html" rel="noreferrer">JMXRemoteLifecycleListener</a>. My test TC installation is set up exactly as stated in the above link. Thus I don't get a connection from one host in our network to another. Additionally a third, random port is open every time I start TC.</p> <p>In my server.xml the listener is activated</p> <pre><code>&lt;Listener className="org.apache.catalina.mbeans.JmxRemoteLifecycleListener" rmiRegistryPortPlatform="8050" rmiServerPortPlatform="8060" /&gt; </code></pre> <p>catalina.out says that everything is okay.</p> <pre><code>2011-06-14 16:46:48,819 [main] INFO org.apache.catalina.mbeans.JmxRemoteLifecycleListener- The JMX Remote Listener has configured the registry on port 8050 and the server on port 8060 for the Platform server </code></pre> <p>The ports are open, I can connect to them via telnet from any other host. I am able to connect to to the vm locally with (<code>service:jmx:rmi://&lt;hostname&gt;:8xxx/jndi/rmi://&lt;hostname&gt;:8xxxx/jmxrmi</code>)</p> <p>Netstats output is as follows:</p> <pre><code>tcp6 0 0 :::8080 :::* LISTEN 11291/java tcp6 0 0 :::8050 :::* LISTEN 11291/java tcp6 0 0 :::8060 :::* LISTEN 11291/java tcp6 0 0 127.0.0.1:8005 :::* LISTEN 11291/java tcp6 0 0 :::60901 :::* LISTEN 11291/java tcp6 0 0 127.0.0.1:8009 :::* LISTEN 11291/java </code></pre> <p>Tomcat is even started with all sufficient VM options</p> <pre><code>CATALINA_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=TRUE -Dcom.sun.management.jmxremote.password.file=$CATALINA_HOME/conf/jmxremote.password -Dcom.sun.management.jmxremote.access.file=$CATALINA_HOME/conf/jmxremote.access" </code></pre> <p>Does anyone has a hint why I am stuck here? Thanks in advance!</p>
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    1. USMartin Röbert
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    1. COtry setting the port in the VM options It looks like you are missing that in your first line of the Cat opts -Dcom.sun.management.jmxremote.port=8086
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    2. CO@Keibosh Regarding the documentation this Option should be a avoided if you are using the TC listener. And even with this option it does not work.
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      1. USMartin Röbert
    3. COGotcha, glossed over too quick the first time. If its running locally without a problem on those ports, You could be hitting this issue. http://olegz.wordpress.com/2009/03/23/jmx-connectivity-through-the-firewall/ halfway down in the article he discusses the private address being pushed to the client and not the public one.
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