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80 lines
3.1 KiB
Markdown
80 lines
3.1 KiB
Markdown
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# jmx2munin
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The [jmx2munin](http://github.com/tcurdt/jmx2munin) project exposes JMX MBean attributes to [Munin](http://munin-monitoring.org/).
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Some of it's features:
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* strictly complies to the plugin format
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* exposes composite types like Lists, Maps, Set as useful as possible
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* String values can be mapped to numbers
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# How to use
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This is what the Munin script will call. So you should test this first. Of course with your parameters. This example expose all Cassandra information to Munin.
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java -jar jmx2munin.jar \
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-url service:jmx:rmi:///jndi/rmi://localhost:8080/jmxrmi \
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-query "org.apache.cassandra.*:*"
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The "url" parameters specifies the JMX URL, the query selects the MBeans (and optionally also the attributes) to expose.
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java -jar jmx2munin.jar \
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-url service:jmx:rmi:///jndi/rmi://localhost:8080/jmxrmi \
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-query "org.apache.cassandra.*:*" \
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-attribute org_apache_cassandra_db_storageservice_livenodes_size
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The script that does the actual interaction with munin you can find in the contrib section. It's the one you should link in the your Munin plugin directory.
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:/etc/munin/plugins$ ls -la cassandra_*
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lrwxrwxrwx 1 root root 37 2011-04-07 19:58 cassandra_nodes_in_cluster -> /usr/share/munin/plugins/jmx2munin.sh
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In the plugin conf you point to the correct configuration
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[cassandra_*]
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env.query org.apache.cassandra.*:*
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[cassandra_nodes_in_cluster]
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env.config cassandra/nodes_in_cluster
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A possible configuration could look like this
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graph_title Number of Nodes in Cluster
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graph_vlabel org_apache_cassandra_db_storageservice_livenodes_size
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org_apache_cassandra_db_storageservice_livenodes_size.label number of nodes
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The script will extract the attributes from the config and caches the JMX results to reduce the load when showing many values.
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# More advanced
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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:
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java -jar jmx2munin.jar \
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-url service:jmx:rmi:///jndi/rmi://localhost:8080/jmxrmi \
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-query "org.apache.cassandra.*:*" \
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list
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It should output a list of possible candidates. This can now be turned into a enum configuration file:
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[org.apache.cassandra.db.StorageService:OperationMode]
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0 = ^Normal
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1 = ^Client
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2 = ^Joining
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3 = ^Bootstrapping
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4 = ^Leaving
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5 = ^Decommissioned
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6 = ^Starting drain
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7 = ^Node is drained
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Which you then can provide:
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java -jar jmx2munin.jar \
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-url service:jmx:rmi:///jndi/rmi://localhost:8080/jmxrmi \
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-query "org.apache.cassandra.*:*" \
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-enums /path/to/enums.cfg
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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.
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# License
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Licensed under the Apache License, Version 2.0 (the "License")
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You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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