A little doc using Jolokia plugin for monitoring a Java virtual machine (JVM):
I use the Jolokia JVM agent - not the WAR deployment.
Example for tomcat monitoring with jolokia agent:
Needs:
- Jolokia jolokia-agent-jvm Jolokia – Download
- JAVA_OPTS config
- Checkmk plugin mk_jolokia.py
- Checkmk config agent jologia.cfg
- Python libs urllib3, requests
Install:
mk_jolokia.py - plugin:
# /usr/lib/check_mk_agent/plugins/mk_jolokia.py
(chmod+x mk_jolokia.py)
The mk_jolokia.py plugin nees python libraries ‘urllib3’ and ‘requests’.
See ‘check_mk_agent’ debug output:
<<<jolokia_info>>>
Error: mk_jolokia requires the requests library. Please install it on the monitored system.
if so, install python-pip and the library
dnfinstallpython-pip
pipinstallrequests
checkmk.cfg:
# /etc/check_mk/jolokia.cfg
instances = [
{
'protocol':'http',
'server':'127.0.0.1',
'port': 7777,
'suburi':'jolokia',
'instance':'jolokia-lab'
}
]
Jolokia JVM agent:
Place the jar file on the host:
# /usr/lib/java/jolokia-agent-jvm-2.1.1-javaagent.jar
(chmod+r, should be readable)
Call it with JAVA_OPTS:
# /etc/tomcat/conf.d/1-jolokia.conf
JDK_JAVA_OPTIONS="-javaagent:/usr/lib/java/jolokia-agent-jvm-2.1.1-javaagent.jar=port=7777,host=0.0.0.0"
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