opensearch-docs-cn/_opensearch/rest-api/cat/cat-nodes.md

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cat nodes

Introduced 1.0 {: .label .label-purple }

The cat nodes operation lists node-level information, including node roles and load metrics.

A few important node metrics are pid, name, master, ip, port, version, build, jdk, along with disk, heap, ram, and file_desc.

Example

GET _cat/nodes?v

Path and HTTP methods

GET _cat/nodes

URL parameters

All cat nodes URL parameters are optional.

In addition to the common URL parameters, you can specify the following parameters:

Parameter	Type	Description
bytes	Byte size	Specify the units for byte size. For example, 7kb or 6gb. For more information, see Supported units.
full_id	Boolean	If true, return the full node ID. If false, return the shortened node ID. Defaults to false.
local	Boolean	Whether to return information from the local node only instead of from the master node. Default is false.
master_timeout	Time	The amount of time to wait for a connection to the master node. Default is 30 seconds.
time	Time	Specify the units for time. For example, 5d or 7h. For more information, see Supported units.
include_unloaded_segments	Boolean	Whether to include information from segments not loaded into memory. Default is false.

Response

ip         | heap.percent | ram.percent | cpu load_1m | load_5m | load_15m | node.role | master | name
172.18.0.3 |     31       |     97      |       3     |  0.03   |   0.10   |  0.14 dimr |  *    |  odfe-node2
172.18.0.4 |     45       |     97      |       3     |  0.19   |   0.14   |  0.15 dimr |  -    |  odfe-node1