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Unable to get service running on remote machine

Moderators: Vladimir Kondratyev, Anton Katilin

Unable to get service running on remote machine

Postby lkhosh » Mon Oct 31, 2016 6:29 pm

Hello Moderators!

I am having a hard time to connect to Youkit on my remove Ubuntu from local YourKit Client.
I can only connect to this Ubuntu via terminal, and the authentication is a private key.

The application I need to profile is running on Ubuntu via Tomcat.
1. I connect to Ubuntu.
2. Install/unpack Yourkit
wget https://www.yourkit.com/download/yjp-20 ... ux.tar.bz2
Unpack: tar xfj yjp-2016.02-b43-linux.tar.bz2
3. switch to YourKit directory
cd /home/user/yjp-2016.02/bin
4. sudo ./yjp.sh -integrate
Going through the options: chose Tomcat server, provided <TOMCAT_HOME>/bin/startup.sh
All other option configurations I picked option 2 for now (which is 'No')
Service is running on PRODUCTION
5. After selecting all options, got positive result:
Startup script to be used for profiling has been successfully created:

Now, I tried few options here and not sure if any are correct.
OPTION 1) Stopped the tomcat, restearted it with /usr/share/tomcat/bin/startup_with_yjp.sh
tomcat's PID changed and when running ps -ef | grep tomcat
UID changed from tomcat to root
instead of : tomcat 31889 1 0 Oct27 + all teh details about tomcat
I get : root 990 + all the details about tomcat
Supposedly NOW the service is running with the profiler, but I am not able to connect from YourKit UI on my client machine.
If try to connect without specifying PORT - connection times out - cant find profiled application
To specify port I need to look in teh following directory <user home>/.yjp/log/<session name>-<PID>.log , but there is no such directory created in my home directory.

OPTION 2) /bin/yjp.sh -attach <PID>
~/yjp-2016.02/bin$ sudo ./yjp.sh -attach 31889 =========> run command
=====got error==========
Attaching to process 31889 using default options
[YourKit Java Profiler 2016.02-b43] Log file: /root/.yjp/log/yjp-8401.log
com.yourkit.runtime.PresentableException: com.sun.tools.attach.AttachNotSupportedException: Unable to open so cket file: target process not responding or HotSpot VM not loaded
at com.yourkit.f.a.a(a:99)
at com.yourkit.f.b.attach(a:133)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.yourkit.Main$5.run(a:8)

Attach to a running JVM failed."
1. Am i NOT supposed to unpack yjp-2016.02-b43-linux.tar.bz2 before I try integrate or attach?
<directory with unpacked content>/bin/yjp.sh -integrate
<directory with unpacked content>/bin/yjp.sh -attach <PID>
2. If I want to attach Profiler to a running app, do I run directly -attach and skip -integrate?
I have a Project with the deadline to develop a procedure of determining a Memory Leak of our services with the help of YourKit Java Profiler. Please help!

Thank you for your time.
Posts: 1
Joined: Mon Oct 31, 2016 5:51 pm

Re: Unable to get service running on remote machine

Postby Anton Katilin » Tue Nov 01, 2016 7:28 am

You should replace your existing /usr/share/tomcat/bin/startup.sh with the (content of) generated /usr/share/tomcat/bin/startup_with_yjp.sh and the restart Tomcat normally.

The log file should be created inside the home directory of the user under which you run Tomcat.

More on remote profiling troubleshooting:
https://www.yourkit.com/docs/java/help/ ... leshooting
Anton Katilin
Posts: 5924
Joined: Wed Aug 11, 2004 8:37 am

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