Red Hat NETWORK SATELLITE 5.1.0 - CHANNEL MANAGEMENT Manual de usuario descargar pdf (Pagina 13)

Building Custom Packages

There are many things that might go wrong when building software packages. This is especially

true when these packages must be delivered and installed through Red Hat Network. This

chapter provides an overview of how to build packages for successful delivery via Red Hat

Network. Topics covered include why to use RPM, how to build packages for RHN, and how to

properly sign packages.

1. Building packages for Red Hat Network

Red Hat Network uses the RPM Package Manager (RPM) technology to determine what

software additions and updates are applicable to each client system. Packages retrieved from

Red Hat Network are usually in RPM format. Entire ISO images, however, are available through

the Software tab of the Red Hat Network website, but are not available in RHN Satellite Server

installations. If your Satellite has Solaris support enabled, you can use RHN Push to upload

Solaris packages to custom channels used by Solaris clients.

RPM is a tool that provides users with a simple method for installing, uninstalling, upgrading,

and verifying software packages. It also allows software developers to package the source code

and compiled versions of a program for end users and developers.

1.1. RPM Benefits

RPM provides the following advantages:

Easy Upgrades

Using RPM, you upgrade individual components of a system without completely reinstalling.

When Red Hat releases a new version of Red Hat Enterprise Linux, users do not have to

reinstall in order to upgrade. RPM allows intelligent, fully-automated, in-place upgrades of

your system. Configuration files in packages are preserved across upgrades so users do

not lose customizations. There are no special upgrade files needed to update a package

because the same RPM file is used to install and upgrade the package.

Package Querying

RPM provides querying options that allows you to search through your entire RPM

database for all packages or just for certain files. You can also easily find out what package

a file belongs to and from where the package came. The files contained in the package are

in a compressed archive, with a custom binary header containing useful information about

the package and its contents. RPM queries the headers quickly and easily.

System Verification

Another feature is the ability to verify packages. If you are worried a file related to a

package was deleted, you can verify the package to check the status of the files it provides.

The verification notifies you of any anomalies. If errors do exist, you can reinstall the files

easily. Modified configuration files are preserved during reinstallation.

Chapter 3.

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Red Hat NETWORK SATELLITE 5.1.0 - CHANNEL MANAGEMENT Manual de usuario Pagina 13