docker - How to use JCommandCentre to display a JFR recoding on a remote server?

Question

How do I use JCommandCentre for a JFR recording on a remote server. To be more clear I have a docker container running java 11, where a JFR recording is already in progress.

JPID=118
jcmd $JPID JFR.configure repositorypath=/tmp/jcmdrecording/
jcmd $JPID JFR.start name=recording1 filename=JFRfile.jfr disk=true dumponexit=true  maxage=1d maxsize=200m  path-to-gc-roots=true
jcmd $JPID JFR.check

Now, in the JCommandCentre it seems that it's expecting some open port 7091. Is this port automatically started by JFR? And I'm suppose to port-forward my docker port 7091 to my localhost 7091?

Answer 1

You need to start the management agent. You can do this when the application starts or using jcmd.

If you don't care about security on startup.

 java -Dcom.sun.management.jmxremote.port=7091
      -Dcom.sun.management.jmxremote.authenticate=false
      -Dcom.sun.management.jmxremote.ssl=false 
      ...

Using jcmd:

jcmd $JPID ManagementAgent.start
     jmxremote.port=7091
     jmxremote.ssl=false
     jmxremote.authenticate=false