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Nodes Info

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Nodes Info

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The cluster nodes info API allows to retrieve one or more (or all) of the cluster nodes information.

curl -XGET 'http://localhost:9200/_nodes'
curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2'

The first command retrieves information of all the nodes in the cluster. The second command selectively retrieves nodes information of only nodeId1 and nodeId2. All the nodes selective options are explained here.

By default, it just returns all attributes and core settings for a node. It also allows to get only information on settings, os, process, jvm, thread_pool, transport, http and plugins:

curl -XGET 'http://localhost:9200/_nodes/process'
curl -XGET 'http://localhost:9200/_nodes/_all/process'
curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/jvm,process'
# same as above
curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/info/jvm,process'

curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/_all

The _all flag can be set to return all the information - or you can simply omit it.

Operating System information

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The os flag can be set to retrieve information that concern the operating system:

os.refresh_interval_in_millis: Refresh interval for the OS statistics
os.name: Name of the operating system (ex: Linux, Windows, Mac OS X)
os.arch: Name of the JVM architecture (ex: amd64, x86)
os.version: Version of the operating system
os.available_processors: Number of processors available to the Java virtual machine
os.allocated_processors: The number of processors actually used to calculate thread pool size. This number can be set with the processors setting of a node and defaults to the number of processors reported by the OS. In both cases this number will never be larger than 32.

Process information

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The process flag can be set to retrieve information that concern the current running process:

process.refresh_interval_in_millis: Refresh interval for the process statistics
process.id: Process identifier (PID)
process.mlockall: Indicates if the process address space has been successfully locked in memory

Plugins information

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plugins - if set, the result will contain details about the loaded plugins per node:

name: plugin name
description: plugin description if any
site: true if the plugin is a site plugin
jvm: true if the plugin is a plugin running in the JVM
url: URL if the plugin is a site plugin

The result will look similar to:

{
  "cluster_name" : "test-cluster-MacBook-Air-de-David.local",
  "nodes" : {
    "hJLXmY_NTrCytiIMbX4_1g" : {
      "name" : "node4",
      "transport_address" : "inet[/172.18.58.139:9303]",
      "hostname" : "MacBook-Air-de-David.local",
      "version" : "0.90.0.Beta2-SNAPSHOT",
      "http_address" : "inet[/172.18.58.139:9203]",
      "plugins" : [ {
        "name" : "test-plugin",
        "description" : "test-plugin description",
        "site" : true,
        "jvm" : false
      }, {
        "name" : "test-no-version-plugin",
        "description" : "test-no-version-plugin description",
        "site" : true,
        "jvm" : false
      }, {
        "name" : "dummy",
        "description" : "No description found for dummy.",
        "url" : "/_plugin/dummy/",
        "site" : false,
        "jvm" : true
      } ]
    }
  }
}

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