As many of you might already know Java VisualVM an all in one Java troubleshooting tool is available as a JDK tool in Sun JDK distributions starting from JDK 6 update 7 and Apple's Java for Mac OS X 10.5 Update 4. Also VisualVM a stand alone separately downloadable tool is also available at visualvm.dev.java.net. It's a visual tool enhances the capability of performance and monitoring analysis for Java SE platform for both production and development environments. You can find more detailed information in the VisualVM product site.
But our topic is how to make visualvm work through SSH Tunnel specifically in production systems where it's a normal practice to allow only SSH access on port 22 for the users or administrators, hence visualvm will not work with the default settings as it uses port 1099 to communicate to remote host via jstatd. For some reason, VisualVM doesn't seem to work through SSH Port Forwarding or SSH Proxy which seems to be a big blocker for many people which wish yo use this tool in this similar kind of setup.
The only way i came up so far to make the VisualVM work is to use to use a system proxifier like WideCap (Free) or ProxyCap (Shareware) and was able to connect to remotely a running java process over ssh proxy. Here are the steps detailing on how to configure ,
1) Download WideCap and install.
2)Open WideCap control panel and click on new proxy , provide hostname as localhost, port
8333, and select the socks version of your SSH that your client and server uses.
3)Add a new application and point to the location of java.exe and create new rule to get triggered when the java is started.
4) Enable WideCap.
5) run putty or any ssh client as SSH proxy daemon. (e.g) putty -D 8333 username@server or ssh -D 8333 user@host
6) Start VisualVM and add remote host and now you should be able to see the java process running on the remote server and you should be able to connect and monitor.
On a cautious note that widecap is not very consistent and it crashes outlook (at least for me ) and IE sometimes but on the other hand proxycap seem to work fine along with other standard windows applications without problems.
Also if you run into problems make sure all the instructions are followed in this link
IBM Blockchain 101: Quick-start guide for developers - This developerWorks quick-start guide is for application developers who are new to blockchain technology and want to quickly set up an IBM Blockchain netwo...
2 weeks ago