Red Hat ENTERPRISE LINUX 5 - VIRTUAL SERVER ADMINISTRATION, Installation Manual

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Chapter 24. Upgrading Your Current System
258
Warning
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
problems. Otherwise, the upgrade procedure takes care of these dependencies, but it may need to
install additional packages which are not on your system.
Depending on how you have partitioned your system, the upgrade program may prompt you to add an
additional swap file. If the upgrade program does not detect a swap file that equals twice your RAM, it
asks you if you would like to add a new swap file. If your system does not have a lot of RAM (less than
256 MB), it is recommended that you add this swap file.
24.2. Upgrading Your System
The
Upgrade Examine
screen appears if you have instructed the installation program to perform an
upgrade.
Note
If the contents of your
/etc/redhat-release
file have been changed from the default,
your Red Hat Enterprise Linux installation may not be found when attempting an upgrade
to Red Hat Enterprise Linux 5.5.
You can relax some of the checks against this file by booting with the following boot
command:
linux upgradeany
Use the
linux upgradeany
command if your Red Hat Enterprise Linux installation was
not given as an option to upgrade.
To perform an upgrade, select
Perform an upgrade of an existing installation
. Click
Next
when you
are ready to begin your upgrade.
To re-install your system, select
Perform a new Red Hat Enterprise Linux installation
and refer
to
http://www.redhat.com/docs/wp/
as well as
Chapter 4, Installing on Intel
®
and AMD Systems
,
Chapter 12, Installing on IBM System i and IBM System p systems
, or
Chapter 17, Installing on IBM
System z Systems
for further instructions.