CentOS is an enterprise Linux distribution based
on the sources from Red Hat Enterprise Linux.
CentOS conforms with Red Hat's redistribution
policy and aims to be 100% binary compatible. Each
CentOS version is supported for 7 years (by means
of security updates). A new CentOS version is
released every 2 years and each CentOS version is
regularly updated (every 6 months) to support
newer hardware. Currently, there are 4 different
supported CentOS releases: CentOS-5 is based on
Red Hat Enterprise Linux 5, CentOS-4 is based on
RHEL4, CentOS-3 is based on RHEL3, and CentOS-2 is
based on RHAS2.1.
System requirement is not defined
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release is based on the upstream release EL 6.0 and includes packages from all variants. All upstream repositories have been combined into one, to make it easier for end users to work with. LiveCDs and LiveDVDs will also be available, and can be used as an install source. A lightweight server edition and a minimal installation CD will be published.
ext4 is now a fully supported file system. libvirt was updated to 0.8.2. bind was updated to 9.7 and now supports NSEC3. ebtables was added. PHP 5.3 is now available in addition to the stock PHP. System Security Services Daemon (SSSD) has been added. Further upgrades include newer version of several wireless drivers, Samba3x, ghostscript, LVM, mod_nss, Subversion, and GCC, plus others.
This release has bugfixes, feature enhancements, and new hardware support. There are no new ISO images for this release. Installs moving forward will be off the 4.8 media and an upgrade will move you from version 4.8 to version 4.9. This is done to maintain compatibility with third party kernel drivers, which are designed to be installed as part of the installation process.
OpenOffice.org has been updated to version 3.1.1,
Samba3x is available in version 3.3.8, PostgreSQL84 in version 8.4, and there is a release of Freeradius2. The latter three aren't installed by default, but they can be used to upgrade from the still included older versions of these packages. Other upgrades include a newer version of the wireless drivers suite, including the ath9k and iwlwifi drivers. GDB, Valgrind, and SystemTap also have been updated. The Live CD has been released in version 5.5 to reflect these changes.
This release adds KVM as a technology preview for virtualization, and extends the number of supported file systems, as XFS is supported in the 64-bit release. FUSE support has been added to the base distribution. ext4 (still as a technology preview) has been updated. On the desktop side, the rebase of ALSA is the most noteworthy change. For developers, version 4.4 of gcc is available. For the first time, the LiveCD has been released at the same time as the corresponding point release of CentOS. From now on, the Live CD will no longer be announced as a separate release.