[[cat-master]]
=== cat master API
++++
<titleabbrev>cat master</titleabbrev>
++++

Returns information about the master node, including the ID, bound IP address,
and name.


[[cat-master-api-request]]
==== {api-request-title}

`GET /_cat/master`

[[cat-master-api-prereqs]]
==== {api-prereq-title}

* If the {es} {security-features} are enabled, you must have the `monitor` or
`manage` <<privileges-list-cluster,cluster privilege>> to use this API.

[[cat-master-api-query-params]]
==== {api-query-parms-title}

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=http-format]

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=cat-h]

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=help]

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=local]

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=cat-s]

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=cat-v]


[[cat-master-api-example]]
==== {api-examples-title}

[source,console]
--------------------------------------------------
GET /_cat/master?v=true
--------------------------------------------------

The API returns the following response:

[source,txt]
--------------------------------------------------
id                     host      ip        node
YzWoH_2BT-6UjVGDyPdqYg 127.0.0.1 127.0.0.1 YzWoH_2
--------------------------------------------------
// TESTRESPONSE[s/YzWoH_2.+/.+/ non_json]

This information is also available via the `nodes` command, but this
is slightly shorter when all you want to do, for example, is verify
all nodes agree on the master:

[source,sh]
--------------------------------------------------
% pssh -i -h list.of.cluster.hosts curl -s localhost:9200/_cat/master
[1] 19:16:37 [SUCCESS] es3.vm
Ntgn2DcuTjGuXlhKDUD4vA 192.168.56.30 H5dfFeA
[2] 19:16:37 [SUCCESS] es2.vm
Ntgn2DcuTjGuXlhKDUD4vA 192.168.56.30 H5dfFeA
[3] 19:16:37 [SUCCESS] es1.vm
Ntgn2DcuTjGuXlhKDUD4vA 192.168.56.30 H5dfFeA
--------------------------------------------------
// NOTCONSOLE
