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Ranger Overview

Last updated: 2021-06-07 17:25:20

    Ranger Overview

    Ranger is a framework for centralized security management of Hadoop components in the field of big data. Users can use Ranger to securely access data in a cluster. It is mainly designed to monitor Hadoop components, and control service launch and resource access. The major goals of Ranger include:

    • Centralized security management of big data components in the web UI or using RESTful APIs provided by Ranger.
    • Authorization to perform specific operations with big data components based on roles and attributes.
    • Centralized auditing of user access and administrative operations (security-related) with big data components.

    Ranger Architecture

    Ranger is mainly composed of Ranger Admin, Ranger UserSync, and Ranger Plugin. Both Ranger Admin and Ranger UserSync are a separate JVM process, while Ranger Plugin needs to be installed on different nodes depending on different components.

    • Ranger Admin is used to manage configured policies, created services, and audit logs and reports. It also persistently saves the policies and services to the database for regular queries from Ranger Plugin.
    • Ranger UserSync is used to synchronize information from LDAP, File, and Unix to Ranger Admin, for example, user and group information from users' Unix or LDAP directory access systems. To synchronize user and group information from Unix, you need to enable the unixAuthenticationService process and persistently store the synchronized information.
    • Ranger Plugin will be deployed on service nodes as needed and periodically synchronize policy information from Ranger Admin.

    The following table lists the components that can be integrated with Ranger.

    Service Installation Nodes EMR Versions
    HDFS NameNode EMR v2.0.1 and above
    HBase Master, RegionServer EMR v2.0.1 and above
    Hive HiveServer2 EMR v2.0.1 and above
    YARN ResourceManager EMR v2.0.1 and above
    Presto All coordinators EMR v2.0.1 and above
    Impala All daemons EMR v2.2.0 and above
    Kudu All masters EMR v3.2.0
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