CentOS 6.9 Release Notes

Last updated: April 5, 2017

1. Translations

Translations of these release notes are available for the following languages :

2. Introduction

Welcome to the CentOS 6.9 release. CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by Red Hat1.

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.

Similar to the practice of the upstream vendor, there is no supported path to 'upgrade' an installation of a prior major CentOS release (CentOS 5) 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 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-6.9. All packages and updates to the 6.9 tree are built against the 6.9 tree and may not work correctly with older 6.x packages. If you want some packages in 6.9, please upgrade all packages. You will have issues if you perform only partial updates.

3. Install Media and sha256sum

sha256sum x86_64:
d27cf37a40509c17ad70f37bc743f038c1feba00476fe6b69682aa424c399ea6  CentOS-6.9-x86_64-bin-DVD1.iso
631b8640460f46a8139a6a7cbbac5f3594d08c32945449b6bbd65234929ce7a4  CentOS-6.9-x86_64-bin-DVD2.iso
422af57b493b8af49d485885a730c5a1d955f803fac85aa51311c393168b9080  CentOS-6.9-x86_64-minimal.iso
6b2cbec908708476389b143841a8e73462506de0744bda8b4192d3655d5bb8d2  CentOS-6.9-x86_64-netinstall.iso
ae56f677786673ad476477ed2df84ce80cf5f9b90a44e25146e69ef3cfd02602  CentOS-6.9-x86_64-LiveDVD.iso

sha256sum i386:
0724a468ec0c4ac46ac6a1daba0273be697a37bb7f4e9fed8ad84ad270cdee2f  CentOS-6.9-i386-bin-DVD1.iso
d95e427ca39588f4287f3bfdb080110c8dcbbfff76e1a6394395ec06858c8275  CentOS-6.9-i386-bin-DVD2.iso
e104b3bc2261e40c020e4047d31a4454a00435787c54fb0a376261f9348382b7  CentOS-6.9-i386-minimal.iso
c498a47b5ec47ecc8423c96bb80e5dd530e4d98bb839c60476cf113d1e4de0d6  CentOS-6.9-i386-netinstall.iso
4f7cd0be1c223b22427830b101e3e1765a93d27ed668047d8183976247a8a427  CentOS-6.9-i386-LiveDVD.iso

4. Major changes

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:

The following controllers from the be2iscsi driver have been deprecated:

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:

Please see the Red Hat Technical Notes for more details concerning deprecated and removed functionality. Please pay special attention to information about using MD5, MD4 and SHA0 in cryptography packages and new limitations in accepted Diffie-Hellmann (DH) parameters.

6. Known Issues

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 6.8 updates with older packages on the 6.9 install media

8. Sources

All CentOS sources are now hosted at vault.centos.org:

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:

And we encourage people to join any of these SIGs or start up a new SIG, e.g.

9.2. 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 the mailing lists and the 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 :

11. Thanks

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) 2017 The CentOS Project


Manuals/ReleaseNotes/CentOS6.9 (last edited 2017-04-10 13:58:16 by InyongHwang)