CentOS 6.5

Il primo Dicembre è stata rilasciata la versione 6.5 di CentOS, basata sul rilascio upstream di RedHat Enterprise Linux 6.5; tutti i repository upstream sono stati combinati in uno solo per facilitare il lavoro degli utenti finali.

E’ possibile effettuare un update da versioni precedenti della 6.x (se non avete modificato il file di configurazione di yum) con il comando:

yum update

Per il download della distribuzione, vi consiglio di scaricarla dal mirror del GARR (la Rete Italiana dell’Università e della Ricerca).

Le maggiori feature di questa versione includono:

• The Precision Time Protocol – previously a technology preview – is now fully supported. The following drivers support network time stamping: bnx2x, tg3, e1000e, igb, ixgbe, and sfc.
• OpenSSL has been updated to version 1.0.1.
• OpenSSL and NSS now support TLS 1.1 and 1.2.
• KVM received various enhancements. These include improved read-only support of VMDK- and VHDX-Files, CPU hot plugging and updated virt-v2v-/virt-p2v-conversion tools.
• Hyper-V and VMware drivers have been updated.
• Updates to Evolution (2.32) and Libre Office (4.0.4).

Alcuni problemi noti in questa versione:

• 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

• Up to version 4.3.4 of VirtualBox the building of the openGL module will fail. See also this thread. This will probably be solved in a future release of VirtualBox.

• 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.

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

• The full x86_64 install and the minimal ISO are bootable on EFI-hardware (For further detail please take a look at CentOS Bug #0006321).

• 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 6.5:

• at-spi
• gtk2-engines
• libcanberra
• libgail-gnome
• libwmf

• 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.

• There may be some 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, boost-*, python.i686.

• There is an issue running Microsoft Windows on VMware Workstation using glib2-2.26.1-3 and kernel-2.6.32-431 (included in CentOS-6.5). Please see this discussion on VMware.com