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CentOS-7 (1708) Release Notes

Last updated: September 15, 2017

1. Translations

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

2. Introduction

The CentOS Project does not provide any verification, certification, or software assurance with respect to security for CentOS Linux. The Security Profiles provided in the CentOS Linux installers are a conversion of the ones included in RHEL Source Code. If certified / verified software that has guaranteed assurance is what you are looking for, then you likely do not want to use CentOS Linux. See this link if you plan to use Security Profiles.

Hello and welcome to the fifth CentOS-7 release. The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL)1. You can read our official product announcement for this release here.

CentOS conforms fully with Red Hat's redistribution policy and aims to have full functional compatibility with the upstream product. CentOS mainly changes packages to remove Red Hat's branding and artwork.

We have decided not to follow Red Hat's usage of Installation Roles. In CentOS Linux all content from every distribution 'channel' is made available to the user at time of installation.

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.

3. Install Media

Various installation images are available for installing CentOS. Which image you need to download depends on your installation environment. All of these images can either be burned on a DVD or dd’ed to an USB memory stick.

If you are unsure which image to use, pick the DVD image. It allows selecting which components you want to install and contains all packages that can be selected from the GUI installer. The 'Everything' DVD is almost twice the size of the ordinary DVD and is not required for most common installs - it is intended for use by sysadmins who want to run their own local mirror.

Live media images are also available, both for Gnome and KDE desktop environments. These allow you to test out CentOS by booting from the DVD or USB stick. You can also install CentOS to your hard disk from the live media images, but please note that what gets installed on your hard disk is exactly the same as you see when using the live media. For more flexibility in selecting which packages you want to have installed, please use the DVD image.

The netinstall image can be used for doing installs over network. After booting the computer with the netinstall image, the installer will ask from where it should fetch the packages to be installed.

The everything image contains all the packages that are available for CentOS-7, including those that are not directly installable from the installer. If you want to install those other packages, you must mount the install media on your installed system after the installation, and copy or install the packages from there. For most users installing from the DVD image and then installing the other packages with ”yum install <packagename>” instead is probably easier.

[Bug 8353]

Attention
At least 1024 MB RAM is required to install and use CentOS-7 (1708). When using the Live ISOs for install, 1024 MB RAM produces very slow results and even some install failures. At least 1344 MB RAM is recommend for LiveGNOME or LiveKDE installs.

4. Verifying Downloaded Installation Images

Before copying the image to your preferred installation media you should check the sha256sum of the downloaded installation images.

sha256sum x86_64:
ec7500d4b006702af6af023b1f8f1b890b6c7ee54400bb98cef968b883cd6546  CentOS-7-x86_64-DVD-1708.iso
8593f5a1631ebfb7581193a7b4ef96d44f500d3ceb49cc4cfbfd71d5698e4173  CentOS-7-x86_64-Everything-1708.iso
9941f5e1257d74e763652ceae5096ed73ddc94a9703ae116931d8713b801fec0  CentOS-7-x86_64-LiveGNOME-1708.iso
4ba63634a8430d134d8a9535c62ff1341c33c898fb1c768a0c6e54fbc92a9133  CentOS-7-x86_64-LiveKDE-1708.iso
bba314624956961a2ea31dd460cd860a77911c1e0a56e4820a12b9c5dad363f5  CentOS-7-x86_64-Minimal-1708.iso
fe3d960cce4d2c1c9f1b66817fe87cc0ee1a1c6c5dd126204cb5c33d51a45620  CentOS-7-x86_64-NetInstall-1708.iso

5. Major Changes

<!> Because of these rebases some 3rd party repositories (Like EPEL, nux!, etc.) may not have all their packages rebuilt to use the newer packages in this release. This may cause the inability to update to the new release until those repositories fix their dependencies. You should contact the 3rd party repository owner to get problems fixed, or remove problem packages from 3rd party repositories to complete the update to this release. This is also true for Special Interest Groups like virt (xen/ovirt), storage (ceph/glusterfs), paas (openshift-origin), and cloud (RDO). You may need to wait to upgrade until the SIGs can build new packages against the 7 (1708) release.

More information can be found at https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_Release_Notes/index.html.

6. Deprecated Features

This release - as already mentioned - features various changes to cryptographic abilities of various packages. Some insecure cryptographic algorithms and protocols are removed from the distro. For a complete list of all removed functions and deprecated packages please take a look at this page.

7. Known Issues

A list of known upstream issues can be found here. Given that we build from the same sources, many if not all of those issues will likely also apply to CentOS Linux. You can also find information on notable updates here.

8. Fixed Issues

9. Packages and Applications

9.1. Packages modified by CentOS

9.2. Packages removed from CentOS that are included upstream

9.3. Packages added by CentOS that are not included upstream

9.4. Packages released as 7.3.1611 updates with older packages on the 7.4.1708 install media

10. Sources

All CentOS-7 sources are hosted at git.centos.org. All code released into the distribution originated from git.centos.org.

Source RPMs will also be published once the release is done, in the usual location at http://vault.centos.org/centos/7/

From a CentOS machine you can easily retrieve sources using the yumdownloader --source <packagename> command.

11. 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.

11.1. Special Interest Groups

CentOS consists of different Special Interest Groups (SIGs) that bring together people with similar interests. The following SIGs already exist (among others):

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

11.2. Mailing Lists and Forums

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 forums.

11.3. 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.

11.4. IRC Presence

The CentOS project maintains a presence on the freenode IRC network as an additional venue for community support and interaction. Please see our IRC wiki article for more information.

12. Further Reading

The following websites contain large amounts of information to help people with their CentOS systems:

13. 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 lots and lots of hours in evenings, nights, weekends and holidays, we couldn't have released this Release in the time we did. A special thanks also goes to the CentOS-community. A more complete list of the contributors to this release can be found at /usr/share/doc/centos-release/Contributors of your new CentOS-7 installation.

Copyright (C) 2017 The CentOS Project


Manuals/ReleaseNotes/CentOS7 (last edited 2017-09-17 11:19:13 by TimothyLee)