The CD iso images for the x86_64 architecture released
initially were incorrect. CD images 1, 3, 4 ,5 and 6 contained an incorrect
timestamp. The master images on central mirror server have been updated with
the correct versions. To check that you have the correct version of the
images, check the file .discinfo inside each image. The first line
should be 1195929648.203590.

The graphical installer is for systems with over 512MB of
memory. Using the graphical installer on systems with less than 512MB may
cause problems.

The anaconda installer needs at least 128MB of memory to work, and will
only use text mode if the system has less than 256MB of RAM.

When you select a lot of packages during a install the amount of memory
required and the time to process the dependencies increases. So it is
advised that on slower systems or systems with limited memory you do a
minimal installation and use yum afterwards to install any missing packages.

Selecting the Extras repository during installation requires that you have
a working internet connection. If not Anaconda may hang trying to reach the
internet. If you are not performing a network install and have selected the
Extras repository then Anaconda will ask you to configure a network
interface so that it can reach the internet.

Kickstart scripts that worked for 5.0 may have
issues on CentOS 5.1 installation trees. So first test your kickstart
scripts with CentOS 5.1 before using them in production.

The CentOS 5.1 kernel has known issues
regarding autofs and nfs. These will most likely be fixed in in a future
update to CentOS 5.1. More information and a patch can be found in bug
report #2448. Note: This issue is fixed by the
2.6.18-53.1.4.el5 kernel update now available in the updates repository.

nautilus-sendto has a require for libgaim.so.0. This file
no longer exists in the CentOS-5 tree, as gaim was replaced by pidgin. This
is an upstream bug, please see bug
report 2483.

During the boot process you may see the message "Memory for crash
kernel (0x0 to 0x0) notwithin permissible range" appear. This message
comes from the new kdump infrastructure. It is a harmless message and can be
safely ignored.

If you use the Virtualization suite (Xen etc.) then the package libvirt
will get installed. Since CentOS 5.1 this package has a dependency for
dnsmasq, which is a lightweight DNS and DHCP server. If you have any other
DNS or DHCP daemons running on the same system you should check that dnsmasq
does not interfere with those.

There is a typo in /etc/X11/xinit/Xsession which causes
errors to appear in .xsession-errors. This is a known bug (#2258)
and will probably be fixed in CentOS 5.2.

The Dovecot package on x86_64 kernels requires the parameter "login_process_size
= 64" to be added to /etc/dovecot.conf after an upgrade to CentOS 5.1.

The system-config-httpd webserver configuration program
still writes configuration files for httpd-2.0 and not for the included
httpd-2.2 webserver (bug
#2078). There is no known date or release for a fixed version.

The yum-security plugin allows the user to download specific patches based
on bugzilla ID and security fixes for specific CVE and upstream releases.
This plugin is not yet working in CentOS 5.1 however we hope to have that
fixed in the near future. An independent announcement will be made once its
working.

The yum-utils package has been moved from extras to Base by the UOP. In
addition, the allowdowngrade, fastestmirror, kernel-module, merge-conf,
priorities, refresh-updatesd, repolist, and tsflags yum plugins are also
provided in CentOS 5.1.