CentOS 6.0 Release Notes
Last updated: Nov 11, 2011
- Install Media and sha1sum
- Known Issues
- Packages and Applications
- How to help and get help
- Further Reading
Translations of these release notes are available for the following languages :
Nederlands (ne) - Joshua Thijssen
Welcome to the CentOS 6.0 release. CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by our Upstream OS Provider (UOP)1.
CentOS conforms fully with the upstream vendor's redistribution policy and aims to be 100% binary compatible. (CentOS mainly changes packages to remove upstream vendor branding and artwork.)
CentOS 6.0 represents many changes from previous releases.
CentOS 6.0 has been completely rebuilt using a newer build system and library checks to confirm upstream binary compatibility.
We have decided not to follow the UOP's usage of Installation Codes. All 'channels' are available to the System Administrator at time of installation.
Similar to the practice of the upstream vendor, there is no supported path to 'upgrade' an installation of a prior major CentOS release (presently CentOS 5 or CentOS 4) to a new major release. This is not a CentOS imposed limitation, but rather reflects the upstream's approach on this matter. People who feel adventuresome and want to experiment are reminded to take and test backups first. As a note to people who attempt the upgrade in spite of this warning, such as by the unsupported upgradeany option from the media install command line, please note that you will need to manually retrieve the current centos-release package, manually do a rpm -e --nodeps removal of the prior centos-release package, and then manually install the CentOS 6 centos-release package, before yum can have any chance of working properly.
Please read through the other sections before trying an install or reporting an issue. Release Notes for the CentOS-6.0 minimal.iso are available here.
3. Install Media and sha1sum
-------------------------------------------- i386 media and their sha1sums are: fcf49e875cd4494f2af68cf257ab9e93523c9427 CentOS-6.0-i386-bin-DVD.iso 862815623d2e7990207dd78a281837c7eb719e83 CentOS-6.0-i386-netinstall.iso 7264fcdae164501384c68a84f4e5ae26111413c4 CentOS-6.0-i386-minimal.iso -------------------------------------------- x86_64 media and their sha1sums are: 9de87b0c696ebd72b952edb4cc06c24cbdc37d81 CentOS-6.0-x86_64-bin-DVD1.iso 5e3834621f11fbcca78cf7d70625c647045f45f5 CentOS-6.0-x86_64-bin-DVD2.iso 23f9e606cbcbd52d2e5df3716a85cdde336f7bfe CentOS-6.0-x86_64-netinstall.iso fea3f0c576e256c41ad4587a6a7c0aedb59dd593 CentOS-6.0-x86_64-minimal.iso --------------------------------------------
4. Known Issues
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 392MB of memory to work. Text mode will automatically be used if the system has less than 652MB 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 installer media for the 32 bits architecture ( CentOS-6.0-i386-netinstall.iso, CentOS-6.0-i386-bin-DVD.iso ) does not offer at boot time the memory test suite (memtest ). The test is available in the x86_64 ( 64 bits - CentOS-6.0-x86_64-netinstall.iso,CentOS-6.0-x86_64-bin-DVD1.iso ) images. This approach is identical to the one taken by the UOP.
The message "Insufficient memory to configure kdump!" appears during install. This is a known upstream bug which appears on systems with less than 4 GB RAM, and will be solved by updating to kexec-tools-2.0.0-153.el6 or newer, not yet available for CentOS-6 as of this writing.
- Content for x86_64 is split into two DVDs. The second disk contains only packages from upstream's "Optional" channel. Installs not requiring any of the packages from the "Optional" category should run using only DVD#1.
- The i386 DVD is just a bit too large to fit on normal single layer DVD+R media. It can be burnt successfully on DVD-R or dual-layer media.
- Make sure that you setup correctly the selinux context of the public key if you transfer it to a CentOS 6 server with selinux enabled. Otherwise selinux might forbid access to the ~/.ssh/authorized_keys file and by matter of consequence key authentication will not work. In order to setup the correct context you can use:
restorecon -R -v /home/$ACCOUNT/.ssh
- ssh-copy-id from CentOS 6 is aware of selinux contexts and the previous workaround is not needed.
Bug #4964 reports a problem with crashes due to gnome-applets. The issue is reportedly related to the build-order of gnome-system-monitor and gnome-applets. An updated version of gnome-applets that fixes the issue is available from the CR (continuous release) repository.
Bug #4969 reports that the x86_64 DVD fails to automatically install when booting from a uEFI based system. The workaround, as documented in the bug, is:
1) Insert your CentOS 6.0 installation DVD into DVD drive 2) In the pre-boot phase of system startup press <F11> to enter UEFI Boot Manager 3) Enter 'UEFI Boot Settings' 4) Choose 'Add Boot Option' 5) Point to 'BOOTX64.efi' file, whose exact path is /EFI/EFI/BOOT/BOOTX64.efi on the DVD 6) Add Description (e.g. "CentOS 6.0") and optionally add Optional Data (which is passed to the boot image, not necessary)After committing you should see that a new boot option has appeared in the UEFI Boot Manager. Choose this new option and enjoy your CentOS 6.0 installation!
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.
A forum user has reported an issue with use of a local repo with a kickstart install, giving an error [Errno 14] Peer cert cannot be verified or peer cert invalid. The referenced post includes a workaround, and pointers to the upstream bug BZ#599040.
5. Packages and Applications
5.1. Packages modified by CentOS
5.2. Packages removed from CentOS that are included upstream
5.3. Packages added by CentOS that are not included upstream
6. How to help and get help
As a CentOS user there are various ways you can help out with the CentOS community. Take a look at our Contribute page for further information on how to get involved.
6.1. Special Interest Groups
CentOS consists of different Special Interest Groups (SIGs) that bring together people with similar interests. The following SIGs already exist:
Artwork - create and improve artwork for CentOS releases and promotion
Promotion - help promoting CentOS online or at events
Virtualization - unite people around virtualization in CentOS
And we encourage people to join any of these SIGs or start up a new SIG, e.g.
- Alpha, S390, Sparc and PPC port - help with porting CentOS to other architectures
- Hardware compatibility - provide feedback about specific hardware
- RPM Packaging - contribute new useful RPM packages
- Translation - help translating the documentation, website and Wiki content
6.2. Mailinglists and Fora
6.3. Wiki and Website
Even as an inexperienced CentOS user we can use your help. Because we like to know what problems you encountered, if you had problems finding specific information, how you would improve documentation so it becomes more accessible. This kind of feedback is as valuable to others as it would have been to you so your involvement is required to make CentOS better.
So if you want to help out and improve our documentation and Wiki, register on the Wiki or subscribe to the centos-docs mailing list.
7. Further Reading
The following websites contain large amounts of information to help people with their CentOS systems :
Upstream release notes and documentation : http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/index.html
We thank everyone involved for helping us produce this product.
Copyright (C) 2011 The CentOS Project