Docker – Java Flight Recorder Docker Container

containersdockerjava

I want to profile a Java app inside a Docker container with JFR. How do I do so? The application I want to profile is not mine, so I can't alter the Dockerfile or any of the source code.

Docker run cmd:

docker run -itd --privileged --memory="_g" --cpuset-cpus x-y -p 
p1:p1 -p p2:p2 -p p3:p3 -p p4:p4 -p p5:p5 --net=host -v 
<hostDirectory>:<containerDirectory> --name=<containerName> <image>

Best Answer

If the Java app is running on a recent JDK, you may be able to attach to the process using jcmd and start a recording, i.e. 

jcmd <pid> JFR.start name=test
jcmd <pid> JFR.dump name=test filename=recording.jfr
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