How to activate JMX on my JVM for access with jconsole

Question

How to activate JMX on a JVM for access with jconsole

User · Answer

Running in a Docker container introduced a whole slew of additional problems for connecting so hopefully this helps someone. I ended up needed to add the following options which I'll explain below:

-Dcom.sun.management.jmxremote=true
-Dcom.sun.management.jmxremote.local.only=false
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false
-Djava.rmi.server.hostname=${DOCKER_HOST_IP}
-Dcom.sun.management.jmxremote.port=9999
-Dcom.sun.management.jmxremote.rmi.port=9998

DOCKER_HOST_IP

Unlike using jconsole locally, you have to advertise a different IP than you'll probably see from within the container. You'll need to replace ${DOCKER_HOST_IP} with the externally resolvable IP (DNS Name) of your Docker host.

JMX Remote & RMI Ports

It looks like JMX also requires access to a remote management interface (jstat) that uses a different port to transfer some data when arbitrating the connection. I didn't see anywhere immediately obvious in jconsole to set this value. In the linked article the process was:

Try and connect from jconsole with logging enabled
Fail
Figure out which port jconsole attempted to use
Use iptables/firewall rules as necessary to allow that port to connect

While that works, it's certainly not an automatable solution. I opted for an upgrade from jconsole to VisualVM since it let's you to explicitly specify the port on which jstatd is running. In VisualVM, add a New Remote Host and update it with values that correlate to the ones specified above:

Then right-click the new Remote Host Connection and Add JMX Connection...

Don't forget to check the checkbox for Do not require SSL connection. Hopefully, that should allow you to connect.

User · Answer

Step 1  Run the application using following parameters   -Dcom sun management jmxremote port 9999  -Dcom sun management jmxremote authenticate false  -Dcom sun management jmxremote ssl false   Above arguments bind the application to the port 9999   Step 2  Launch jconsole by executing the command jconsole in command prompt or terminal   Select    Remote Process     and enter the url as  IP Address  9999 and click on Connect button to connect to the remote application   You can refer this link for complete application

User · Answer

I had this exact issue  and created a GitHub project for testing and figuring out the correct settings   It contains a working Dockerfile with supporting scripts  and a simple docker-compose yml for quick testing

User · Answer

On Linux  I used the following params   -Djavax management builder initial   -Dcom sun management jmxremote  -Dcom sun management jmxremote port 9010  -Dcom sun management jmxremote local only false -Dcom sun management jmxremote authenticate false  -Dcom sun management jmxremote ssl false   and also I edited  etc hosts so that the hostname resolves to the host address  192 168 0 x  rather than the loopback address  127 0 0 1

User · Answer

Note  Java 6 in the latest incarnation allows for jconsole to attach itself to a running process even after it has been started without JMX incantations   If that is available to you  also consider jvisualvm as it provides a wealth of information on running processes  including a profiler

User · Answer

The below options works for me  -Dcom sun management jmxremote true -Dcom sun management jmxremote port 9010 -Dcom sun management jmxremote rmi port 9010 -Dcom sun management jmxremote local only false -Dcom sun management jmxremote authenticate false -Dcom sun management jmxremote ssl false -Djava rmi server hostname  host name   and remember to open 9010 port in the server sudo ufw allow 9010 udp sudo ufw allow 9010 tcp sudo ufw reload

User · Answer

along with below command line parameters     -Dcom sun management jmxremote port 9999 -Dcom sun management jmxremote authenticate false -Dcom sun management jmxremote ssl false   Sometimes in the linux servers   imx connection doesn t get succeeded  that is because   in cloud linux host  in  etc hosts so that the hostname resolves to the host address    the best way to fix it is  ping the particular linux server from other machine in network and use that host IP address in the   -Djava rmi server hostname IP address that obtained when you ping that linux server    But never rely on the ipaddress that you get from linux server using ifconfig me  the ip that you get there is masked one which is present in the host file

User · Answer

Run your java application with the following command line parameters   -Dcom sun management jmxremote port 8855 -Dcom sun management jmxremote authenticate false -Dcom sun management jmxremote ssl false   It is important to use the -Dcom sun management jmxremote ssl false parameter if you don t want to setup digital certificates on the jmx host    If you started your application on a machine having IP address 192 168 0 1  open jconsole  put 192 168 0 1 8855 in the Remote Process field  and click Connect

User · Answer

I m using WAS ND 7 0  My JVM need all the following arguments to be monitored in JConsole      -Djavax management builder initial       -Dcom sun management jmxremote      -Dcom sun management jmxremote port 8855      -Dcom sun management jmxremote authenticate false      -Dcom sun management jmxremote ssl false

User · Answer

First you need to check if your java process is already running with JMX parameters  Do this    ps -ef   grep java   Check your java process you need to monitor  If you can see jmx rmi parameter Djmx rmi registry port xxxx then use the port mentioned here in your java visualvm to connect it remotely under jmx connection    If it s not running through jmx rmi port then you need to run your java process with below mentioned parameters    -Djmx rmi registry port 1234 -Djmx rmi port 1235 -Dcom sun management jmxremote authenticate false -Dcom sun management jmxremote ssl false   Note  port numbers are based on your choice   Now you can use this port for jmx coneection  Here it is port 1234

User · Answer

The relevant documentation can be found here   http   java sun com javase 6 docs technotes guides management agent html  Start your program with following parameters     -Dcom sun management jmxremote -Dcom sun management jmxremote port 9010 -Dcom sun management jmxremote rmi port 9010 -Dcom sun management jmxremote local only false -Dcom sun management jmxremote authenticate false -Dcom sun management jmxremote ssl false   For instance like this   java -Dcom sun management jmxremote     -Dcom sun management jmxremote port 9010     -Dcom sun management jmxremote local only false     -Dcom sun management jmxremote authenticate false     -Dcom sun management jmxremote ssl false     -jar Notepad jar   -Dcom sun management jmxremote local only false is not necessarily required but without it  it doesn t work on Ubuntu  The error would be something like this   01 Oct 2008 2 16 22 PM sun rmi transport  customer  TCPTransport AcceptLoop executeAcceptLoop WARNING  RMI TCP Accept-0  accept loop for ServerSocket addr 0 0 0 0 0 0 0 0 port 0 localport 37278  throws java io IOException  The server sockets created using the LocalRMIServerSocketFactory only accept connections from clients running on the host where the RMI remote objects have been exported      at sun management jmxremote LocalRMIServerSocketFactory 1 accept LocalRMIServerSocketFactory java 89      at sun rmi transport  customer  TCPTransport AcceptLoop executeAcceptLoop TCPTransport java 387      at sun rmi transport  customer  TCPTransport AcceptLoop run TCPTransport java 359      at java lang Thread run Thread java 636    see http   bugs sun com bugdatabase view bug do bug id 6754672  Also be careful with -Dcom sun management jmxremote authenticate false which makes access available for anyone  but if you only use it to track the JVM on your local machine it doesn t matter   Update   In some cases I was not able to reach the server  This was then fixed if I set this parameter as well  -Djava rmi server hostname 127 0 0 1

[java] How to activate JMX on my JVM for access with jconsole?

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