Red Hat ENTERPRISE LINUX AS 2.1 - Guide d'installation télécharger pdf (Page 51)

Appendix C.

Upgrading Your Current System

This appendix explains the various methods available for upgrading your Red Hat Enterprise Linux

system.

C.1. Determining Whether to Upgrade or Re-Install

Although upgrades are supported from Red Hat Enterprise Linux 3, you are more likely to have a

consistent experience by backing up your data and then installing this release of Red Hat Enterprise

Linux 4 over your previous Red Hat Enterprise Linux installation.

This recommended reinstallation method helps to ensure the best system stability possible.

For more information about re-installing your Red Hat Enterprise Linux system, refer to the Technical

Whitepapers available online at http://www.redhat.com/docs/wp/.

If you currently use Red Hat Enterprise Linux 3, you can perform a traditional, installation program-

based upgrade.

However, before you chose to upgrade your system, there are a few things you should keep in mind:

• Individual package conﬁguration ﬁles may or may not work after performing an upgrade due to

changes in various conﬁguration ﬁle formats or layouts.

• If you have one of Red Hat’s layered products (such as the Cluster Suite) installed, it may need to

be manually upgraded after the Red Hat Enterprise Linux upgrade has been completed.

• Third party or ISV applications may not work correctly following the upgrade.

Upgrading your system installs the modular 2.6.x kernel as well as updated versions of the packages

which are currently installed on your system.

The upgrade process preserves existing conﬁguration ﬁles by renaming them with an .rpmsave ex-

tension (for example, sendmail.cf.rpmsave). The upgrade process also creates a log of its actions

in /root/upgrade.log.

Caution

As software evolves, conﬁguration ﬁle formats can change. It is very important to carefully compare

your original conﬁguration ﬁles to the new ﬁles before integrating your changes.

Note

It is always a good idea to back up any data that you have on your systems. For example, if you are

upgrading or creating a dual-boot system, you should back up any data you wish to keep on your

hard drive(s). Mistakes do happen and can result in the loss of all of your data.

Some upgraded packages may require the installation of other packages for proper operation. If you

choose to customize your packages to upgrade, you may be required to resolve dependency prob-

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Red Hat ENTERPRISE LINUX AS 2.1 - Guide d'installation Page 51