Red Hat ENTERPRISE LINUX 3 - FOR IBM S-390 AND IBM ESERVER ZSERIES, Руководство по установке

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Appendix C. Upgrading Your Current
System
This appendix explains the various methods available for upgrading your Red Hat Enterprise
Linux system.
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 5.0.0 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
Whitepapers available online at http://www.redhat.com/solutions/info/whitepapers/ .
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
extension (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.
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