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Each Carbon-based product uses a database to store information such as user management details and registry data. All nodes in the cluster must use one central database for config and governance registry mounts. These instructions assume you are installing MySQL as your relational database management system (RDBMS), but you can install another supported RDBMS as needed. You can create the following databases and associated datasources.

WSO2_USER_DB

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Configure the shared registry database and mounting details in the <PRODUCT_HOME>/repository/conf/registry.xml file of the manager node as shown below:

<dbConfig name="sharedregistry">
	<dataSource>jdbc/WSO2RegistryDB</dataSource>
</dbConfig>

<remoteInstance url="https://localhost:9443/registry">
	<id>instanceid</id>
	<dbConfig>sharedregistry</dbConfig>
	<readOnly>false</readOnly>
	<enableCache>true</enableCache>
	<registryRoot>/</registryRoot>
	<cacheId>regadmin@jdbc:mysql://carbondb.mysql-wso2.com:3306/REGISTRY_DB?autoReconnect=true</cacheId>
</remoteInstance>

<mount path="/_system/config" overwrite="true">
	<instanceId>instanceid</instanceId>
	<targetPath>/_system/asNodes</targetPath>
</mount>

<mount path="/_system/governance" overwrite="true">
	<instanceId>instanceid</instanceId>
	<targetPath>/_system/governance</targetPath>
</mount>

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• The dataSource you specify under the <dbConfig name="sharedregistry"> tag must match the jndiConfig name specified in the master-datasources.xml file of the manager and worker.
• The registry mount path is used to identify the type of registry. For example, ”/_system/config” refers to configuration registry, and "/_system/governance" refers to the governance registry.
• The dbconfig entry enables you to identify the datasource you configured in the master-datasources.xml file. We use the unique name sharedregistry to refer to that datasource entry. 
• The remoteInstance section refers to an external registry mount. We can specify the read-only/read-write nature of this instance as well as caching configurations and the registry root location. In case of a worker node, the readOnly property should be true, and in case of a manager node, this property should be set to false. 
• Additionally, we must specify cacheId, which enables caching to function properly in the clustered environment. Note that cacheId is the same as the JDBC connection URL of the registry database. This value is the cacheId of the remote instance. Here the cacheId should be in the format of $database_username@$database_url, where $database_username is the username of the remote instance database and $database_url is the remote instance database URL. This cacheID is used to identify the cache it should look for when caching is enabled. In this case, the database we should connect to is REGISTRY_DB, which is the database shared across all the master/workers nodes. You can identify that by looking in the mounting configurations, where the same datasource is being used.
• You must define a unique name “id” for each remote instance, which is then referred to from mount configurations. In the above example, the unique ID for the remote instance is instanceId. 
• In each of the mounting configurations, we specify the actual mount path and target mount path. The targetPath can be any meaningful name. In this instance, it is /_system/asNodes.

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