CentOS 6.8 Released

eva2000 · May 26, 2016

Doing my yum updates for a few servers, I noticed CentOS 6.8 is out now [CentOS-announce] Release for CentOS Linux 6.8 i386 and x86_64

We are pleased to announce the immediate availability of CentOS Linux
6.8 and install media for i386 and x86_64 Architectures. Release Notes
for 6.8 are available at:

Manuals/ReleaseNotes/CentOS6.8 - CentOS Wiki

We recommend everyone review these release notes.

CentOS Linux 6.8 is derived from source code released by Red Hat, Inc.
for Red Hat Enterprise Linux 6.8. All upstream variants have been
placed into one combined repository to make it easier for end users.
Workstation, server, and minimal installs can all be done from our
combined repository. All of our testing is only done against this
combined distribution.

There are many fundamental changes in this release, compared with the
past CentOS Linux 6 releases, and we highly recommend everyone study
the upstream Release Notes as well as the upstream Technical Notes
about the changes and how they might impact your installation. (See
the 'Further Reading' section if the CentOS release notes link above).

All updates since the upstream 6.8 release are also on the CentOS
mirrors as zero day updates. When installing CentOS-6.8 (or any other
version) from any of our media, you should always run 'yum update'
after the install to apply these.

Users consuming our centos-cr repositories will already be running all
the packages that make up CentOS-6.8, and all updates released since.
They will notice only the centos-release and anaconda updates today
when moving to CentOS Linux 6.8. For more information on the CR
repository for future updates, see this link:
AdditionalResources/Repositories/CR - CentOS Wiki

Release Announcements for all updated packages are available here:
The CentOS-CR-announce May 2016 Archive by thread

+++++++++++++++++++++++
Upgrading From Prior Major CentOS Versions:

We recommend everyone perform a fresh reinstall rather than attempt an
inplace upgrade from other major CentOS versions (CentOS-2.1, CentOS-3.x,
CentOS-4.x, CentOS-5.x).

+++++++++++++++++++++++
Upgrading from CentOS-6.0 / 6.1 / 6.2 / 6.3 / 6.4 / 6.5 / 6.6 or 6.7

CentOS Linux is designed to automatically upgrade between releases
within a major version (in this case, CentOS-6). Unless you have
edited your yum default configuration, a 'yum update' should move your
machines seamlessly from any previous CentOS Linux 6.x release to 6.8.
We also test this in our QA cycles and have noticed no problems, any
issues would be mentioned in the Release Notes.
Click to expand...

From Manuals/ReleaseNotes/CentOS6.8 - CentOS Wiki !

Major changes

libreswan replaces openswan as VPN endpoint solution (support added in NetworkManager)

sssd has a number of new capabilities and now supports smart cards, support for SSLv2 has been disabled

XFS support increased to a maximum file system size of 300TB

various applications now support TLSv1.2, i.e. OpenLDAP, yum, stunnel, vsftpd, git, postfix and others. Also TLSv1.2 has been enabled by default in various packages

various applications now support elliptic-curve parameters, i.e. Perl Net:SSLeay or Perl IO::Socket::SSL

dmidecode now supports SMBIOS 3.0.0

kickstart files can now be pulled from https sources

chrony has been added as an alternative to NTPd

squid 3.4 is available as a replacement to squid 3.1

enhancements have been made for guests running Hyper-V i.e. reporting kernel crashes to the hypervisor or running as a generation 2 guest

New package rear can be used to continuously create recovery images

SSLv3 and older insecure protocols are disabled by default, and various packages now have more configuration options to select the desired protocols

libreoffice has been rebased to 4.3.7.2

various packages have been rebased to more current version i.e. elfutils, SystemTap, ipmitool, memtest86+, icedtea-web, various hardware drivers, shadow utils, virt-who and others

Click to expand...

to update
Code (Text):
yum update --disableplugin=priorities --enablerepo=remi -y
Code (Text):
cat /etc/redhat-release
CentOS release 6.8 (Final)

eva2000 · May 26, 2016

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.

VirtualBox may have problems starting CentOS 6 VMs that were created in UEFI mode.
UEFI on CentOS-6.8: None of the i386 (32 bit) CentOS-6.8 ISOs will work with UEFI. All the x86_64 CentOS-6.8 ISOs should boot and work with UEFI. No versions of CentOS 6.8 will work with Secure Boot turned on. Secure Boot must be disabled to install CentOS 6.8. (For further detail please take a look at CentOS Bug #6321).

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.

Content for both the i386 and x86_64 architectures 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:
Code (Text):
restorecon -R -v /home/$ACCOUNT/.ssh
ssh-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 6.8:

at-spi

gtk2-engines

libgail-gnome
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:
Code (Text):
dd if=CentOS-6.8-x86_64-bin-DVD1.iso of=/dev/sdb
Click to expand...
hmm memory usage seems to get higher for installs !

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.

Click to expand...

yum buyvm.net's kvm centos6 suffers from this one so need to go into console to start it up first before ssh'ing in

Many people have complained that Ethernet interfaces are not started with the new default NetworkManager tool. SeeCentOS-6 FAQ#2.

Click to expand...

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