Dear List,
I have implemented JMelody ( http://code.google.com/p/javamelody/ ) with
just a small and simple modification of web.xml of the Debian package of
Nuxeo DM 5.4 (Tomcat) as described here
http://code.google.com/p/javamelody/wiki/UserGuideAdvanced#Deployment_on_Tomcat_without_modification_of_monitored_webapps_(
<http://code.google.com/p/javamelody/wiki/UserGuideAdvanced#Deployment_on_Tomcat_without_modification_of_monitored_webapps_%28>
This works flawlessly and is quite nice. Next I integrated this monitor
facility into our monitoring system of choice Icinga (a Nagios fork)
with a plugin: https://github.com/sbower/nagios_javamelody_plugin/wiki
Any pointers or insights regarding normal and abnormal/danger usage of
system resourced are very welcome!
This gives me besides a website with an overview of system/app/service
statuses the possibility to send alerts in various ways.
My problem now is how to define sensible warning & critical values for
the things JMelody can monitor:
(as defined in:
https://github.com/sbower/nagios_javamelody_plugin/blob/master/src/main/java/advws/net/nagios/jmeoldy/core/CheckJMelody.java
)
private final static String ACTIVE_CONNECTIONS =
"activeConnections"; //activeConnections
private final static String ACTIVE_THREADS = "activeThreads";
//activeThreads
private final static String GC = "gc";
//gc
private final static String HTTP_HITS_RATE = "httpHitsRate";
//httpHitsRate
private final static String HTTP_MEAN_TIMES = "httpMeanTimes";
//httpMeanTimes
private final static String HTTP_SESSIONS = "httpSessions";
//httpSessions
private final static String HTTP_SYSTEM_ERRORS =
"httpSystemErrors"; //httpSystemErrors
private final static String LOADED_CLASSES_COUNT =
"loadedClassesCount"; //loadedClassesCount
private final static String SQL_HITS_RATE = "sqlHitsRate";
//sqlHitsRate
private final static String SQL_MEAN_TIMES = "sqlMeanTimes";
//sqlMeanTimes
private final static String SQL_SYSTEM_ERRORS =
"sqlSystemErrors"; //sqlSystemErrors
private final static String THREAD_COUNT = "threadCount";
//threadCount
private final static String USED_CONNECTIONS = "usedConnections";
//usedConnections
private final static String USED_MEMORY = "usedMemory";
//usedMemory
private final static String USED_NON_HEAP_MEMORY =
"usedNonHeapMemory"; //usedNonHeapMemory
So I am looking for critical and warning levels for each of these items.
I understand that this has also to do with hardware, OS, number of
users, database system in use and possibly other variables, but I have
to start somewhere. Any pointers or insights regarding normal and
abnormal/dangerous usage of system resources are very welcome! Thanks in
advance, Olaf
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