java - VisualVM through firewalls - RMI troubleshooting -


sorry question must have been asked many times, can't succeed in resolving problem. i've read lot of blogs, sites, forums, .... , didn't find solution in case.

case : need connect visualvm on box distant servers (tomcats, weblogics) performance / threads / memory monitoring. servers installed on (physical or virtual) machines protected firewall. large intervals of ports open in firewall , can used, not ports.

tests

  • i've tried direct connections through jmx in visualvm, using following jvm options on server-side @ server startup : 
     -djava.rmi.server.hostname=[hostname] -dcom.sun.management.jmxremote -dcom.sun.management.jmxremote.port=[port] -dcom.sun.management.jmxremote.ssl=false -dcom.sun.management.jmxremote.authenticate=false

i've precised hostname because network hostname , ip address of server not same network of remote server.

no success, visualvm seems searching unknown server.

  • tried starting jstatd on server-side on port accessible (-p option) box (telnet on port works), when launching visualvm on host jstatd port, still seems waiting unreachable.... same behavior jps connecting remote host.

  • tried using same tools on server less network protection, , works. have seen connections between box , server , done on ports different i've specified jstatd. understand port needed first communication (kind of handshake) , real communications done on other ports, not predictible (ex: 60305, 55197, ...). not sure understand how rmi works.

please, me, i'm going crazy !

unfortunately jmx tries open ports other 1 configure. yesterday succeeded connecting tomcat behind firewall via jmx. 2 tricky parts are:

  • put file called jmxremote.access in catalina_home/conf, contains following lines:

    monitorrole readonly controlrole readwrite

  • in server.xml set ports used jmx, via special tomcat listener (catalina-jmx-remote.jar required in /lib):

    <listener classname="org.apache.catalina.mbeans.jmxremotelifecyclelistener"      rmiregistryportplatform="9009" rmiserverportplatform="9010" />

then open these 2 ports on firewall. works. that's tomcat.

another option use ssh tunnelling. in short - connect via ssh , configure forward local port (where jmx client running) ports on other side of tunnel.

references:


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