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Chapter 2.

Introduction to RHN Channels

A Red Hat Network channel is a collection of software packages. Channels help you seg-

regate packages by sensible rules: a channel may contain packages from a speciﬁc Red

Hat distribution, for instance. A channel may contain packages for an application or family

of applications. Users may also deﬁne channels for their own particular needs; a company

may create a channel that contains packages for all of the organization’s laptops, for exam-

ple.

2.1. Base Channels and Child Channels

There are two types of channels: base channels and child channels. A base channel consists

of packages based on a speciﬁc architecture and Red Hat Enterprise Linux release. A child

channel is a channel associated with a base channel that contains extra packages.

A system must be subscribed to only one base channel. A system can be subscribed to

multiple child channels of its base channel. A subscribed system can only install or update

packages available through its Red Hat Network channels.

When a system is registered with Red Hat Network, it is assigned to the base channel that

corresponds to the system’s version of Red Hat Enterprise Linux. Once a system is regis-

tered, its default base channel may be changed to a private base channel on a per-system

basis via the RHN website. Alternately, you can have activation keys associated with a

custom channel so that systems registering with those keys are automatically associated

with the custom channel.

On the Red Hat Network website, the Channels page (located under the Channels tab on

the top navigation bar) provides a list of all base channels and their child channels. Clicking

on the name of a channel displays the Channel Details page, which provides a list of all

of the packages in that channel, its errata, and any associated systems.

2.2. Subscribing to Channels

Subscribe systems to channels in the following ways:

• Registration through activation keys — Because of the simplicity and speed of activa-

tion keys, this is the preferred method for registering systems as clients of either RHN

Proxy Server or RHN Satellite Server. Systems registered using an activation key are

subscribed to all channels associated with that activation key. For more information on

activation keys, consult the Red Hat Network Client Conﬁguration Guide and the Red

Hat Network Reference Guide.

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