[[cat-nodeattrs]]
== cat nodeattrs

The `nodeattrs` command shows custom node attributes.

["source","sh",subs="attributes,callouts"]
--------------------------------------------------
% curl 192.168.56.10:9200/_cat/nodeattrs
node       host    ip          attr  value
Black Bolt epsilon 192.168.1.8 rack  rack314
Black Bolt epsilon 192.168.1.8 azone us-east-1
--------------------------------------------------

The first few columns give you basic info per node.


["source","sh",subs="attributes,callouts"]
--------------------------------------------------
node       host    ip
Black Bolt epsilon 192.168.1.8
Black Bolt epsilon 192.168.1.8
--------------------------------------------------


The attr and value columns can give you a picture of custom node attributes.

[source,sh]
--------------------------------------------------
attr  value
rack  rack314
azone us-east-1
--------------------------------------------------

[float]
=== Columns

Below is an exhaustive list of the existing headers that can be
passed to `nodeattrs?h=` to retrieve the relevant details in ordered
columns.  If no headers are specified, then those marked to Appear
by Default will appear. If any header is specified, then the defaults
are not used.

Aliases can be used in place of the full header name for brevity.
Columns appear in the order that they are listed below unless a
different order is specified (e.g., `h=attr,value` versus `h=value,attr`).

When specifying headers, the headers are not placed in the output
by default.  To have the headers appear in the output, use verbose
mode (`v`). The header name will match the supplied value (e.g.,
`pid` versus `p`).  For example:

["source","sh",subs="attributes,callouts"]
--------------------------------------------------
% curl 192.168.56.10:9200/_cat/nodeattrs?v&h=name,pid,attr,value
name       pid   attr  value
Black Bolt 28000 rack  rack314
Black Bolt 28000 azone us-east-1
--------------------------------------------------

[cols="<,<,<,<,<",options="header",subs="normal"]
|=======================================================================
|Header |Alias |Appear by Default |Description |Example
|`node`|`name`|Yes|Name of the node|Black Bolt
|`id` |`nodeId` |No |Unique node ID |k0zy
|`pid` |`p` |No |Process ID |13061
|`host` |`h` |Yes |Host name |n1
|`ip` |`i` |Yes |IP address |127.0.1.1
|`port` |`po` |No |Bound transport port |9300
|`attr` | `attr.name` | Yes | Attribute name | rack
|`value` | `attr.value` | Yes | Attribute value | rack123
|=======================================================================