The Rivendell Security Paradigm

All Rivendell modules make use of the following four classes of system resources:

We'll cover each of these concepts in turn.

Hosts

Every physical computer within a given network that is running Rivendell software is referred to as a host. Any host in a Rivendell network can be individually configured and controlled from any other host (provided the system administrator has enabled this capability). Hosts can be used for a wide variety of applications, including content ingestion and management, automatic recording (sometimes referred to as net-catching), onair play out or log (sometimes also referred to as playlist) generation. It is also possible for a single host to perform all of these functions.

Users

Every host on a Rivendell network has one or more users available to it. In this context, a 'user' is merely a set of access policies established by the system administrator that defines what tasks a given host is or is not allowed to perform. Every host has at least one user, called the default user. As the name suggests, this is the set of user policies that are loaded by default when the system starts up. It is also possible to change the user currently in use on a given host by running the RDLogin module.

Groups

A Rivendell group is a system of categories that is used by the audio library to classify and organize the audio within the library. Groups are a very powerful capability, and many operations within Rivendell can be specified on the basis of group membership. The actual classification scheme, including the number of available groups and their names, is completely arbitrary so as to allow each facility to tailor a schema that best fits its own operational requirements. Designing and implementing the group schema is one of the most important tasks facing the Rivendell system administrator, as a well-designed schema can make long-term maintenance and management of the system substantially easier vis-a-vis a poorly thought out one. We will cover groups in detail in the chapters devoted to the RDLibrary and RDAdmin modules.

Services

Every facility at which Rivendell is deployed is presumed to have one or more ultimate destinations for which audio is intended. These could be radio stations (e.g. WAVA), satellite uplink channels, live Internet audio streams, or any mix of the above. Each of these sorts of destinations is referred to in Rivendell as a service, and certain parameters, particularly as regards audio play out and log (playlist) creation, can be configured on the basis of what particular service is being referenced.


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