Connecting jconsole remotely

For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

Connecting jconsole remotely - the principles

BEWARE - this first is a "shows you how" and is insecure ... I am doing the demo this way because the security requirements add various issues that would complicate the first demonstration of principle.

1. Set up your SERVER to allow jmx remote connections on an otherwise unused port - we have done this by changing the Java options in the catalina.sh script - around line 188 in version 6.0.18 (ahead of the comment shown below) I added 2 lines:

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.port=9876"

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.authenticate=false"

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.ssl=false"

# ----- Execute The Requested Command --------------------------

2. Restart the server via that catalina.sh script

3. Start the jconsole monitor

jconsole 192.168.200.215:9876

Now ... you should go back and add authenticated users ... lots of instructions available - here are some URLs to start you!

http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html#remote
http://forums.sun.com/thread.jspa?threadID=737279
http://java.sun.com/j2se/1.5.0/docs/guide/management/faq.html
http://blogs.sun.com/jmxetc/entry/troubleshooting_connection_problems_in_jconsole

If you want to try out this (and all the other Tomcat stuff) with us ... have a look at out Apache httpd / Tomcat course ... you may want to ask for an "extra day" too if you're wanting to go into the more advanced topics in detail.
(written 2009-03-14)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

A506 - Web Application Deployment - Java - Installing and Deploying optional Technologies
  [1718] Increasing Java Virtual Machine memory for Tomcat - (2008-07-24)
  [2079] Java - Memory Allocation and garbage collection - (2009-03-14)
  [2082] Jmeter - a first test case - (2009-03-14)
  [3043] Gathering information - logging - with log4j. First steps. - (2010-11-12)

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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