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Export JMX information to Munin
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src/main/java/org/vafer/jmx
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README.md
pom.xml

README.md

jmx2munin

The jmx2munin project exposes JMX MBean attributes to Munin. Some of it's features:

  • strictly complies to the plugin format
  • exposes composite types like Lists, Maps, Set as useful as possible
  • String values can be mapped to numbers

How to use

This is what Munin will call. So you should test this first. Of course with your parameters. This example expose all Cassandra information to Munin.

java -jar jmx2munin.jar \
     -url service:jmx:rmi:///jndi/rmi://localhost:8080/jmxrmi \
     -query "org.apache.cassandra.*:*" \
     -config /path/to/plugin.cfg \

The "url" parameters specifies the JMX URL, the query selects the MBean to expose and the config points to the Munin plugin configuration. Something along the lines of:

graph_title Load average
graph_args --base 1000 -l 0
graph_vlabel load
graph_scale no
graph_category system
load.label load
load.warning 10
load.critical 120
graph_info The load average.
load.info Average load for the five minutes.

More advanced

Sometimes it can be useful to track String values by mapping them into an enum as they really describe states. To find this possible candidates you can call:

java -jar jmx2munin.jar \
     -url service:jmx:rmi:///jndi/rmi://localhost:8080/jmxrmi \
     -query "org.apache.cassandra.*:*" \
     list

It should output a list of possible candidates. This can now be turned into a enum configuration file:

[org.apache.cassandra.db.StorageService:OperationMode]
0 = ^Normal
1 = ^Client
2 = ^Joining
3 = ^Bootstrapping
4 = ^Leaving
5 = ^Decommissioned
6 = ^Starting drain
7 = ^Node is drained

Which we then provide:

java -jar jmx2munin.jar \
     -url service:jmx:rmi:///jndi/rmi://localhost:8080/jmxrmi \
     -query "org.apache.cassandra.*:*" \
     -config /path/to/plugin.cfg \
     -enums /path/to/enums.cfg

Now matching values get replaced by their numerical representation. On the left needs to be a unique number on the right side is a regular expression. If a string cannot be matched according to the spec "U" for "undefined" will be returned.

License

Licensed under the Apache License, Version 2.0 (the "License") You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

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