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6.0 Administration
This section describes how to manage the nodes and services that make up a cluster.
Administering Volumes
This section provide information about how to organize and manage data using volumes, a unique feature of MapR clusters.
Managing Data with Volumes
Enabling and Restricting Access to Tenant Volume and Data

6.0 Administration
This section describes how to manage the nodes and services that make up a cluster.
- Administering Users and Clusters
- Administering Nodes
- Administering Volumes
  This section provide information about how to organize and manage data using volumes, a unique feature of MapR clusters.
  - Managing Data with Volumes
  - Managing Snapshots
    This section provide information about managing snapshots.
  - Managing User Disk Usage
  - Managing Schedules
- Administering Files and Directories
- Administering Tables
  Administration of the MapR-DB is done primarily via the command line (maprcli) or with the MapR Control System (MCS). Regardless of whether the MapR-DB table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. MapR-DB administration is associated with tables, columns and column families, and table regions.
- Administering Streams
- Administering MapR Gateways
  A MapR gateway mediates one-way communication between a source MapR cluster and a destination cluster. You can replicate MapR-DB tables (binary and JSON) and MapR-ES streams. MapR gateways also apply updates from JSON tables to their secondary indexes and propagate Change Data Capture (CDC) logs.
- Administering Services
- Monitoring the Cluster
  This section describes how to monitor the health and performance of a MapR cluster.
- Configuring Security
  Describes how to configure MapR security and manage secure clusters.
- Managing Secure Clusters
  Provides procedures that will enable you to use MapR clusters securely.
- Administering the MapR Data Access Gateway
  The MapR Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the MapR cluster. This section describes considerations when upgrading the service, how to modify configuration settings, and how to administer and manage the service.
- Planning for High Availability
- Administrator's Reference
  This section contains in-depth reference information for the administrator.
- Troubleshooting Cluster Administration
- Best Practices for Backing Up MapR Information

Enabling and Restricting Access to Tenant Volume and Data

About this task

In a multi-tenant environment, the tenant volume (share) can be accessed by all users on the tenant instance by default. To restrict access to specific users and/or groups:

Procedure

Log in to the cluster as the cluster administrator and set ACEs on the volume using the volume commands.
For example:
```
maprcli volume modify -name <volumename> -readAce "u:<user>|g:<group>" -writeAce "u:<user>|g:<group>"
```
Here, value for <user> must be the UID of the user and value of <group> must be GID of the group on the tenant host.
TIP: For more information, see maprcli volume modify command.
Log in as the tenant admin and set permissions for data access.
You can set permissions using:
- Linux commands such as chmod, chown, and so on.
- Access control expressions, which can be set on files and directories in the volume. For more information, see Using ACEs for MapR-FS.