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6.0 Administration
This section describes how to manage the nodes and services that make up a cluster.
Administrator's Reference
This section contains in-depth reference information for the administrator.
MapR Environment
This section provides information associated with the MapR environment.
Environment Variables
Describes the environment variables specific to MapR.

MapR 6.0 Documentation

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.
- 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.
  - maprcli and REST API Syntax
    This section provides information about the MapR command API. Most commands can be run on the command-line interface (CLI), or by making REST requests programmatically or in a browser.
  - Utilities
    This section contains information about various scripts and utilities.
  - Configuration Files
    This section contains reference information about various configuration files.
  - Alarms Reference
    The pages in this section provide details about all of the types of alarms.
  - MapR Environment
    This section provides information associated with the MapR environment.
    - MapR Parameters
    - Default MapR Configurations
    - Environment Variables
      Describes the environment variables specific to MapR.
      - About env_override.sh
    - Ports Used by MapR
    - Log Files
    - Cluster Maintenance Schedule
    - Language Support for MapR-DB Tables
      This section lists the human languages that MapR-DB tables can store, retrieve, and process.
- Troubleshooting Cluster Administration
- Best Practices for Backing Up MapR Information

Environment Variables

Describes the environment variables specific to MapR.

For MapR 6.0 and later, environment variables should be set in /opt/mapr/conf/env_override.sh. Editing /opt/mapr/conf/env.sh is no longer recommended. For more information, see About env_override.sh.

Variable	Example Values	Description
`CLDB_EXTERNAL_RPC_PORT`	5000	If clients outside the cluster cannot reach CLDB on the default port, use the `CLDB_EXTERNAL_RPC_PORT` environment variable to specify the port on which CLDB can be reached.
`JAVA_HOME`	/usr/lib/jvm/java-7-sun	The directory where the correct version of Java is installed.
`MAPR_HOME`	/opt/mapr (default)	The directory in which MapR is installed.
`MAPR_EXTERNAL`	10.10.123.25,10.10.123.30	If your cluster nodes have multiple NICs, use the MAPR_EXTERNAL environment variable to grant external clients access to a cluster node on specific IP addresses. The value of the MAPR_EXTERNAL environment variable on a node is a comma-separated list of up to four IP addresses with no spaces.
`MAPR_SUBNETS`	10.10.123.0/24,10.10.124.0/24	`MAPR_SUBNETS` is used for MapR RPC to RPC communication. The MFS, CLDB, NFS, and LOOPBACKNFS modules use this environment variable. The NFS and LOOPBACKNFS modules use this environment variable when registering with CLDB. If you do not want MapR to use all NICs on each node, use this environment variable to restrict MapR traffic to specific NICs. Set `MAPR_SUBNETS` to a comma-separated list of up to four subnets in CIDR notation with no spaces. If you do not set `MAPR_SUBNETS`, MapR uses all NICs present on the node. When `MAPR_SUBNETS` is set, make sure that the node can reach all nodes in the cluster (servers and clients) using the specified subnets.
`MAPR_USER`	`mapr` (default)	Used with configure.sh to specify the user under which MapR runs its services. If not explicitly set, it defaults to the user `mapr`. After `configure.sh` is run, the value is stored in `daemon.conf`.
`MAPR_ECOSYSTEM_LOGIN_OPTS`	`hybrid`	Specifies the JAAS configuration to use with installed open source components.

(Topic last modified: 2019-04-29)