CentOS 6.4 Release Major changes and Known Issues

Welcome to the CentOS 6.4 release. CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by our Upstream OS Provider (UOP)

Major changes
As announced in the CentOS-6.3 Release Notes matahari is now deprecated. CentOS-6.4 ships one last update that should remove all remains of matahari. To ensure all remains are erased run yum erase matahari* after updating to 6.4.
dev86, iasl, and qemu-guest-agent have been added to the i386 architecture.

Microsoft Hyper-V drivers have been added to allow CentOS to be more efficient as a Virtual Machine when installed on Microsoft Hyper-V server.
The samba4 libraries (provided by the samba4-libs package) have been upgraded to the latest upstream version to improve interoperability with Active Directory (AD) domains. If you upgrade from CentOS-6.3 to CentOS-6.4 and you have Samba in use, make sure to uninstall the samba4 package to avoid conflicts during the upgrade. samba4 is still – at least in part – considered a technology preview.


Known Issues

The upstream Mozilla NSS disabled support for MD5 hash signed certificates in the 3.14 release, which was added to CentOS 6.4. More details and workarounds can be found in this Fedora bugzilla report
With this release the ABI for the X.org video drivers changes, possibly resulting in a failing X-Session. If you are running 3rd party drivers – i.e. vBox addons, nVidia, ATI or ELRepo – you need to ensure a compatible driver is loaded. In the case of vBox rebuilding the vBox-addons and restarting the X-Session solves this issue. This should not concern anyone who uses the default drivers shipped with CentOS

Up to version 4.2.10 of vBox the building of the openGL module will fail. See also this thread. 4.2.12 solves this issue.

On Intel and AMD based processor architectures, CentOS 6 requires PAE support for 32-bit x86 chips, following the upstream’s requirement
The installer needs at least 406MB of memory to work. Text mode will automatically be used if the system has less than 632MB of memory.

The text installer has limited capabilities compared to the GUI installer. Most notably there is no support for configuring partition layout, storage methods or package selection. Please refer to the official documentation for details. Here you can find some useful information on creating and using kickstart files which can be used to perform advanced configuring without the need for the GUI installer.
The message “Insufficient memory to configure kdump!” appears during install. This is a known issue which appears on systems with less than 2 GB RAM. This can be ignored.
Content for both the i386 and x86_64 architectures is split into two DVDs. We have tried to get all basic server and basic desktop installs only from DVD-1.

There is no longer a boot.iso image in the images/ directory of the installation tree. Use the netinstall.iso instead as documented in CentOS-6 FAQ #1.

Many people have complained that Ethernet interfaces are not started with the new default NetworkManager tool. See CentOS-6 FAQ#2.

tutorial centos

The full x86_64 install ISO is bootable on EFI-hardware (For further detail please take a look at CentOS Bug #0005387).

Several packages have .centos. in their name but are not modified packages, see CentOS Bug #0005281 for details. Here are the SRPMS still affected in the 6.4:

at-spi
gtk2-engines
libcanberra
libgail-gnome
libwmf

An upgrade of existing installations of CentOS-6 can leave the iptables-multi and ip6tables-multi binaries with incorrect SELinux labels. In turn this fact may break 3rd party applications ( such as fail2ban). The bug was reported upstream . A workaround is to run

    restorecon -v /sbin/ip*-multi-1.4.7

The proprietary drivers for older AMD ( former ATI ) video cards, namely the 2xxx, 3xxx and 4xxx series ( both integrated in motherboards or standalone cards) are not compatible with the new version of the X server introduced in CentOS-6.4. As of mid-March 2013 the only known workaround allowing the use of the proprietary drivers is to downgrade the X server ( xorg* packages ) to the versions available in CentOS 6.3. More details about the extensive investigation around this issue is available here. Make sure that you do not allow yum to upgrade again the packages that have been downgraded by adding the following to the end of /etc/yum.conf

    exclude=xorg*

Note that use of proprietary drivers was never needed for CentOS-6 if all you wanted was a dual-monitor setup. See this FAQ entry for more details on using a dual-monitor setup.
The old i686 RPM for Samba4 is included on the x86_64 media in CentOS-6.4. Upstream has removed the i686 RPM for the new version of the package, also leaving the old version in the trees. While we have duplicated this, it causes a problem if you try to upgrade an x86_64 install with samba4-*4.0.0-23.alpha11.el6.i686* RPMS installed. Please remove the samba4*.i686 RPMS from your x86_64 install if you have upgrade issues, then perform the upgrade.
In addition to the samba4 RPM mentioned above, there are also other i686 RPMs that are no longer available on the x86_64 media. If you have any of the following i686 RPMs installed on your x86_64 system, please remove the i686 RPMs before attempting to upgrade: dovecot-devel, evolution-mapi, evolution-mapi-devel, iscsi-initiator-utils, iscsi-initiator-utils-devel, openchange, openchange-devel.

 

Translations

  • Translations of these release notes are available for the following languages :
  • Deutsch (de) – Christoph Galuschka
  • English (en)
  • Nederlands (nl) – Joshua Thijssen
  • Português do Brasil (pt-br) – Cleber Paiva de Souza
  • Romana (ro) – Manuel Wolfshant
  • 简体中文 (zh-cn) – Haowei Lee
  • 繁體中文 (zh-tw) – Timothy Lee

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