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6.0 Administration
This section describes how to manage the nodes and services that make up a cluster.
Configuring Security
Describes how to configure MapR security and manage secure clusters.
Configuring Mapr Security
Provides usage information for frequently used security functionality, including Access Control Lists (ACLs), Access Control Expressions (ACEs), file permissions, and subnet whitelisting.
Managing Access Controls
Describes how to create, enable, and use ACLs and ACEs.
Managing Access Control Expressions
Defines and describes how to create, enable, and use ACEs.
Using ACEs for MapR-FS
Managing Whole Volume ACEs
Deleting Whole Volume ACEs

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.
  - Configuring Mapr Security
    Provides usage information for frequently used security functionality, including Access Control Lists (ACLs), Access Control Expressions (ACEs), file permissions, and subnet whitelisting.
    - Getting Started with MapR Security
      Describes two core scenarios that allow quick implementation of security features.
    - Managing Encryption for MapR Core
      Provides information that allows you to use encryption across the MapR platform.
    - Configuring Authentication
      Provides information about MapR ticket, Kerberos, Pluggable Authentication Module (PAM) authentication.
    - Managing Access Controls
      Describes how to create, enable, and use ACLs and ACEs.
      - Managing Access Control Lists
        Defines and describes how to create ACLs.
      - Managing Access Control Expressions
        Defines and describes how to create, enable, and use ACEs.
        ACE Syntax
        Creating User Roles for ACEs
        Defining ACEs
        Using ACEs for MapR-FS
        Managing File and Directory ACEs
        Describes the implications of setting access control expressions on files and directories.
        Managing Whole Volume ACEs
        Setting Whole Volume ACEs
        Deleting Whole Volume ACEs
        Enabling Table and Stream Authorizations with ACEs
      - Creating Subnet Whitelists
        Provides the procedure necessary to restrict access to cluster data.
  - Managing Impersonation
    Provides instructions for enabling and using MapR impersonation features.
- 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

Deleting Whole Volume ACEs

You cannot remove ACEs that have been set; instead, if necessary, use the empty string ("") to deny specific types of access. If the empty string is used to deny a specific type of access, that type of access is denied to all users. To deny access to specific users only, use the negation operator (!).