[[cluster-nodes-info]] == Nodes Info The cluster nodes info API allows to retrieve one or more (or all) of the cluster nodes information. [source,js] -------------------------------------------------- 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 <>. 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`, `plugins` and `ingest`: [source,js] -------------------------------------------------- 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. [float] [[os-info]] ==== Operating System information 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. [float] [[process-info]] ==== Process information 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 [float] [[plugins-info]] ==== Plugins information `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: [source,js] -------------------------------------------------- { "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 } ] } } } -------------------------------------------------- [float] [[ingest-info]] ==== Ingest information `ingest` - if set, the result will contain details about the available processors per node: * `type`: the processor type The result will look similar to: [source,js] -------------------------------------------------- { "cluster_name": "elasticsearch", "nodes": { "O70_wBv6S9aPPcAKdSUBtw": { "ingest": { "processors": [ { "type": "date" }, { "type": "uppercase" }, { "type": "set" }, { "type": "lowercase" }, { "type": "gsub" }, { "type": "convert" }, { "type": "remove" }, { "type": "fail" }, { "type": "foreach" }, { "type": "split" }, { "type": "trim" }, { "type": "rename" }, { "type": "join" }, { "type": "append" } ] } } } } --------------------------------------------------