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CentOS 6.10 Release Notes
Last updated: July 3rd, 2018
- Install Media and sha256sum
- Major changes
- Deprecated Features
- Known Issues
- Packages and Applications
- How to help and get help
- Further Reading
Translations of these release notes are available for the following languages :
Welcome to the CentOS 6.10 release. CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by Red Hat1. You can read our official product announcement for this release here
CentOS conforms fully with Red Hat's redistribution policy and aims to be functionally compatible. CentOS mainly changes packages to remove upstream vendor branding and artwork.
The 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.
NOTE: There is NO mechanism to pick only partial upgrades of packages to CentOS-6.10. All packages and updates to the 6.10 tree are built against the 6.10 tree and may not work correctly with older 6.x packages. If you want some packages in 6.10, please upgrade all packages. You will have issues if you perform only partial updates.
3. Install Media and sha256sum
The installation kit is split into two DVDs. It is possible to do a full install with only the first DVD. The second DVD contains only supplementary RPMs, which can be installed afterwards if needed. The installer does not ask for the second DVD during installation. You should check the sha256sum of the downloaded installation images.
sha256sum x86_64: a68e46970678d4d297d46086ae2efdd3e994322d6d862ff51dcce25a0759e41c CentOS-6.10-x86_64-bin-DVD1.iso 723ca530171faf29728b8fe7bb6d05ca2ceb6ba9e09d73ed89f2c0ff693e77a5 CentOS-6.10-x86_64-bin-DVD2.iso 7c0dee2a0494dabd84809b72ddb4b761f9ef92b78a506aef709b531c54d30770 CentOS-6.10-x86_64-minimal.iso 56f7b078a3b443095ba006cdc85319c691251cda98c5d73d12ef6db7aff6b4c1 CentOS-6.10-x86_64-netinstall.iso 1375342d72579d0816ad60a8a27c1acfa81d18fbe7cef20cbd08c8fedd2fa475 CentOS-6.10-x86_64-LiveDVD.iso sha256sum i386: 25d95b3f178e59bd672fa97e043a9191cbf73bb6cd12f5df9b540fa88076cae8 CentOS-6.10-i386-bin-DVD1.iso 64967808de00d8d6426a24c98c7239d30bcb99fa177736b72bacf9e22c85aeab CentOS-6.10-i386-bin-DVD2.iso cfa7d1808ab1ef4821276b18e05f4a4a7d15560a6a2d8e31caf2fa07fd4cd252 CentOS-6.10-i386-minimal.iso 54cb419451db9cb97ea1128739156803e9b3fef10a61248eac6a31708e3355e0 CentOS-6.10-i386-netinstall.iso d94892863c113acd633f169e84870dae8bbb9b57b873e06d38e99c7b73c52ce7 CentOS-6.10-i386-LiveDVD.iso
ISO downloads are available here
4. Major changes
- The following packages have been rebased to a newer upstream release: pacemaker, clufter, gcc-libraries
- GCC now supports retpolines, which aids in mitigating Spectre Variant 2 attacks
- iptables-services can now read configuration files from /etc/sysctl.d
- BIND contains the new root KSK in preparation for the upcoming DNSSEC Root Zone Key-Signing-Key rollover
5. Deprecated Features
The following device drivers have been deprecated, they may be removed in future releases and will not receive updates:
The following controllers from the megaraid_sas driver have been deprecated:
- Dell PERC5, PCI ID 0x15
- SAS1078R, PCI ID 0x60
- SAS1078DE, PCI ID 0x7C
- SAS1064R, PCI ID 0x411
- VERDE_ZCR, PCI ID 0x413
- SAS1078GEN2, PCI ID 0x78
The following controllers from the be2iscsi driver have been deprecated:
- BE_DEVICE_ID1, PCI ID 0x212
- OC_DEVICE_ID1, PCI ID 0x702
- OC_DEVICE_ID2, PCI ID 0x703
NOTE: Deprecated drivers SHOULD still function in CentOS 6 until EOL, they will likely not be supported in future versions of CentOS (ie, CentOS 7)
The following packages have been deprecated and may be removed in future releases of CentOS 6. They will no longer receive updates:
The following items have seen some or all items removed from the upstream source code:
- openswan component
- seabios component
- Btrfs file system
- eCryptfs file system
- mingw component
- virtio-win component
- fence-agents component
- systemtap component
- matahari component
- openscap component
TLS compression support has been removed from NSS to prevent security risks.
Mozilla no longer includes code signing trust attributes in their CA trust list. The ca-certificates package has been modified to reinclude those code signing trust attributes by default. The ca-legacy command can be used to select whether the unmodified Mozilla CA trust list should be used or not.
ipt and xt actions have been dropped from iproute due to long-standing issues with those actions.
Please see the Red Hat Technical Notes for more details concerning deprecated and removed functionality.
6. Known Issues
- On UEFI-capable systems, CentOS 6.x writes its boot configuration to /boot/efi/EFI/redhat. This will cause problems for those who want to have CentOS and RHEL installed on the same system. This issue may remain unfixed for the lifetime of CentOS 6. CentOS 7 does not have this issue.
UEFI on CentOS-6.10: None of the i386 (32 bit) CentOS-6.10 ISOs will work with UEFI. All the x86_64 CentOS-6.10 ISOs (except LiveDVD) should boot and work with UEFI. No versions of CentOS 6 will work with Secure Boot turned on. Secure Boot must be disabled to install CentOS 6. For further detail please take a look at CentOS Bug #6321.
Even though there is an option for upgrading when booting from the .iso images, the recommended way of upgrading is via yum update. Minimal will only update the packages that reside on the minimal iso, and when booting from DVD, the installer can't handle switching to the 2nd DVD if upgrading a package that resides on the 2nd DVD.
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.
- 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/.sshssh-copy-id from CentOS 6 is aware of selinux contexts and the previous workaround is not needed.
Many people have complained that Ethernet interfaces are not started with the new default NetworkManager tool. See CentOS-6 FAQ#2.
Several packages have .centos. in their name but are not modified packages, see CentOS Bug #5281 for details. Here are the SRPMS still affected in the 6.10:
There is an issue with loading the ipv6 kernel module in some cases, which produces this error: Unknown symbol unregister_inet6addr_notifier . See bug 10927 for details.
Due to the changes in the Xorg subsystem the VirtualBox Tools have to be rebuilt for the GUI to start
If you use the SCL or Xen4CentOS repositories the locations of these have changed as these repos are now being maintained by Special Interest Groups. If you get errors updating your SCLs, do: yum remove centos-release-SCL then yum install centos-release-scl-rh. Xen should update as part of the normal update process.
One can do USB key installs by using dd to copy individual ISO files to a USB key using the device name (not the partition name). This will overwrite the entire USB key. Here is an example for the DVD1:
dd if=CentOS-6.10-x86_64-bin-DVD1.iso of=/dev/sdb
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
7.4. Packages released as 6.9 updates with older packages on the 6.10 install media
All CentOS sources are now hosted at vault.centos.org:
Software Collections: http://vault.centos.org/6.10/SCL/Source/SPackages/
9. 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.
9.1. 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
9.2. Mailinglists and Fora
9.3. 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.
10. Further Reading
The following websites contain large amounts of information to help people with their CentOS systems :
Upstream release notes and documentation : https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.10_Release_Notes/index.html
We thank everyone involved for helping us produce this product and would like to specifically acknowledge the extra effort made by the QA Team. Without them working almost 24/7 we couldn't have released this as fast as we did.
Copyright (C) 2018 The CentOS Project