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CentOS 6.1 Release Notes
Last updated: Dec 12, 2011
Translations of these release notes are available for the following languages :
[:Manuals/ReleaseNotes/CentOS6.1/Czech:Česky (cs)] - [:DavidHrbac:David Hrbáč]
[:Manuals/ReleaseNotes/CentOS6.1/German:Deutsch (de)] - [:ChristophGaluschka:Christoph Galuschka]
[:Manuals/ReleaseNotes/CentOS6.1/Italian:Italiano (it)] - [:GianlucaCecchi:Gianluca Cecchi]
[:Manuals/ReleaseNotes/CentOS6.1/Japanese:日本語 (ja)] - [:TadashiJokagi:Tadashi Jokagi]
[:Manuals/ReleaseNotes/CentOS6.1/Dutch:Dutch (nl)] - [:JoshuaThijssen:Joshua Thijssen]
[:Manuals/ReleaseNotes/CentOS6.1/BrazilianPortuguese:Português do Brasil (pt-br)] - [:CleberSouza:Cleber Paiva de Souza]
[:Manuals/ReleaseNotes/CentOS6.1/Chinese:简体中文 (zh-cn)] - [:TimothyLee:Timothy Lee]
[:Manuals/ReleaseNotes/CentOS6.1/ChineseTW:繁體中文 (zh-tw)] - [:TimothyLee:Timothy Lee]
Welcome to the CentOS 6.1 release. CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by our Upstream OS Provider (UOP)FootNote(Visit http://www.redhat.com/rhel/).
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.)
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.
The [http://wiki.centos.org/AdditionalResources/Repositories/CR continuous release ( CR ) repository] makes generally available packages that will appear in the next point release of CentOS, on a testing and hotfix basis until formally released.
Please read through the other sections before trying an install or reporting an issue.
3. Install Media and sha1sum
i386 2ef1eb330efeb8bca5646700481b1a645f726bdb CentOS-6.1-i386-bin-DVD1.iso e12d7f473fa7f13931738f3c37f57d99e66c2ff2 CentOS-6.1-i386-bin-DVD2.iso ff2a275577d0dff56debb47aca28ef4019d0be6e CentOS-6.1-i386-LiveCD.iso 9ea2b421c0fe91cb3a1c4de8cf741b3d3cc8aa8e CentOS-6.1-i386-LiveDVD.iso 89b0cb3cad239b55e3de74ec741738b8def45f30 CentOS-6.1-i386-minimal.iso b0163bcf2777b9c19542a89106094aafea45f3aa CentOS-6.1-i386-netinstall.iso x86_64 6cf7de61f851bbdb6859ce0a33d65d9554219509 CentOS-6.1-x86_64-bin-DVD1.iso 7bfd52eaa5ada445982c3f528c1f481bbcda85c8 CentOS-6.1-x86_64-bin-DVD2.iso 94c9c829c8ce8500d764a91b4714b8e1b8240d8b CentOS-6.1-x86_64-LiveCD.iso 9f00cbee90f9fd12d0f60dabecba170b9272b2ee CentOS-6.1-x86_64-LiveDVD.iso aecef89e8a6d0996e9aefb0001d5ae5fd8e408f1 CentOS-6.1-x86_64-minimal.iso 2d0e5c3c91717996c7d3d35658f79ccac767b564 CentOS-6.1-x86_64-netinstall.iso
4. New Functionality
There are a number of yum changes and enhancements. James Antill has described these in detail in a blog post: http://illiterat.livejournal.com/8221.html
5. Known Issues
On Intel and AMD based processor architectures, CentOS 6 requires PAE support for 32-bit x86 chips, following the upstream's [https://bugzilla.redhat.com/show_bug.cgi?id=589332 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 [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/ch-guimode-x86.html#id4594292 the official documentation] for details. [http://wiki.centos.org/TipsAndTricks/KickStart 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-6.1-i386-netinstall.iso, CentOS-6.1-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-6.1-x86_64-netinstall.iso,CentOS-6.1-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 [https://bugzilla.redhat.com/show_bug.cgi?id=652724 upstream bug] which appears on systems with less than 4 GB RAM. This can be ignored.
- Content for both the i386 and x86_64 arches is split into two DVDs. We have tried to get all basic server and basic desktop installs only from DVD-1.
- 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.
There is no longer a boot.iso image in the images/ directory of the installation tree. Use the netinstall.iso instead as documented in [http://wiki.centos.org/FAQ/CentOS6#head-c44e0ab6188ce37ff04eb13dbb34e3f61d08ddab CentOS-6 FAQ #1].
Many people have complained that Ethernet interfaces are not started with the new default NetworkManager tool. See [http://wiki.centos.org/FAQ/CentOS6#head-b67e85d98f0e9f1b599358105c551632c6ff7c90 CentOS-6 FAQ#2].
A forum user has [https://www.centos.org/modules/newbb/viewtopic.php?viewmode=flat&topic_id=32549&forum=55 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 [https://bugzilla.redhat.com/show_bug.cgi?id=599040 BZ#599040].
The packages tog-pegasus and libcmpiCppImpl0 can not be installed at the same time due to file conflicts. See upstream bugzilla entry [https://bugzilla.redhat.com/show_bug.cgi?id=759302 #759302] for details.
Several packages have .centos. in their name and are not modified, see [http://bugs.centos.org/view.php?id=5281 CentOS Bug #0005281] for details. Here are the SRPMS affected:
On Live CD/DVD, Anaconda crash after timezone selection screen when the hostname is modified. See upstream bugzilla entry [https://bugzilla.redhat.com/show_bug.cgi?id=698282 #698282] for details.
- Due to space constraints, some packages (like Gimp) were removed from the LiveCD. Some smaller packages were added, like rdesktop,tigervnc,vinagre and tsclient
system-config-date is missing a changelog entry (this is a carryover from the CentOS-6.0 build). See [http://bugs.centos.org/view.php?id=5284 CentOS Bug #0005284] for details.
6. Fixed Issues
[http://bugs.centos.org/view.php?id=4943 CentOS bug #0004943]: ntp defaults to [0-2].rhel.pool.ntp.org
[http://bugs.centos.org/view.php?id=4964 CentOS bug #0004964]: system monitor applet segfaults a second after it is added to the panel
[http://bugs.centos.org/view.php?id=4969 CentOS bug #0004969]: DVD ISO fails to install automatically on uEFI based systems
[http://bugs.centos.org/view.php?id=4993 CentOS bug #0004993]: /etc/abrt/gpg_keys still references RHEL keys
[http://bugs.centos.org/view.php?id=4995 CentOS bug #0004995]: grub-0.97-68.el6 breaks some scripts having image files in /usr/share/grub/x86_64-unknown
[http://bugs.centos.org/view.php?id=5084 CentOS bug #0005084]: Tomcat6 init.d script sets ownership of log files wrong, breaking if TOMCAT_USER is anything other than tomcat
[http://bugs.centos.org/view.php?id=5158 CentOS bug #0005158]: centos6 BASH_VERSINFO/MACHTYPE
7. Packages and Applications
7.1. Packages modified by CentOS
7.2. Packages removed from CentOS that are included upstream
7.3. Packages added by CentOS that are not included upstream
8. 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.
8.1. Special Interest Groups
CentOS consists of different [http://wiki.centos.org/SpecialInterestGroup Special Interest Groups] (SIGs) that bring together people with similar interests. The following SIGs already exist:
[:SpecialInterestGroup/Artwork:Artwork] - create and improve artwork for CentOS releases and promotion
[:SpecialInterestGroup/Promo:Promotion] - help promoting CentOS online or at events
[:SpecialInterestGroup/Virtualization: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
8.2. Mailinglists and Fora
Another way you can help others in the community is by actively helping and resolving problems that users come up against in [http://lists.centos.org/mailman/listinfo the mailing lists] and [http://www.centos.org/modules/newbb/ the fora].
8.3. 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 [http://lists.centos.org/mailman/listinfo/centos-docs centos-docs] mailing list.
9. 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
[https://www.centos.org/modules/newbb/index.php?cat=9 CentOS-6 fora]
We thank everyone involved for helping us produce this product.
Copyright (C) 2011 The CentOS Project