DOC-1828 rladmin cluster master reference

content/rs/references/cli-utilities/rladmin/cluster/master.md

@@ -0,0 +1,44 @@
+---
+Title: rladmin cluster master
+linkTitle: master
+description: Identifies or changes the cluster's master node.
+weight: $weight
+alwaysopen: false
+toc: "true"
+headerRange: "[1-2]"
+tags: ["configured"]
+categories: ["RS"]
+aliases:
+---
+
+Identifies the cluster's master node. Use `set` to change the cluster's master to a different node.
+
+```sh
+cluster master [ set <node_id> ]
+```
+
+### Parameters
+
+| Parameter | Type/Value | Description |
+|-----------|------------|-------------|
+| node_id | integer | Unique node ID |
+
+### Returns
+
+Returns the ID of the cluster's master node. Otherwise, it returns an error message.
+
+### Example
+
+Identify the cluster's master node:
+
+```sh
+$ rladmin cluster master
+Node 1 is the cluster master node
+```
+
+Change the cluster master to node 3:
+
+```sh
+$ rladmin cluster master set 3
+Node 3 set to be the cluster master node
+```