Red Hat Enterprise Linux 6 6.6 Release Notes Edition 6

Transcription

Red Hat Enterprise Linux 6 6.6 Release Notes Edition 6
Red Hat Enterprise Linux 6
6.6 Release Notes
Release Notes for Red Hat Enterprise Linux 6.6
Edition 6
Red Hat Customer Content Services
Red Hat Enterprise Linux 6 6.6 Release Notes
Release Notes for Red Hat Enterprise Linux 6.6
Edition 6
Red Hat Custo mer Co ntent Services
Legal Notice
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Abstract
The Release No tes pro vide high-level co verage o f the impro vements and additio ns that have
been implemented in Red Hat Enterprise Linux 6 .6 . Fo r detailed do cumentatio n o n all changes
to Red Hat Enterprise Linux fo r the 6 .6 update, refer to the Technical No tes.
T able of Cont ent s
T able of Contents
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Preface
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⁠E nhanc ed SCSI Unit Attentio n Hand ling
⁠O p en vSwitc h Kernel Mo d ule
⁠l ib hug etlb fs Sup p o rt fo r IBM Sys tem z
⁠K eywo rd s fo r ip ld ev and c o nd ev in c io _ig no re Availab le fo r IBM Sys tem z
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⁠C hang es to HPN Ad d -O n
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⁠S CAP Sec urity G uid e
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⁠N ew lib ic a APIs
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⁠N ew Pac kag es : hyp erv-d aemo ns
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⁠T ec hno lo g y Preview: Red Hat Enterp ris e Linux 6 .6 Ho s ted as a G eneratio n 2 Virtual Mac hine
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⁠E nhanc ements to d evic e-map p er
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⁠Q SAM Ac c es s Metho d fo r Data s haring with z /O S - Stag e 1
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⁠d m-era Tec hno lo g y Preview
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⁠keep alived Fully Sup p o rted
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⁠H APro xy Fully Sup p o rted
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⁠C TDB Up g rad e
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. .7. .. Hardware
. . . . . . . . .Enablement
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⁠S up p o rt fo r Intel Wild c at Po int-LP PCH
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⁠S up p o rt fo r VIA VX9 0 0 Med ia Sys tem Pro c es s o r
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⁠FIPS 140 Revalid atio ns
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⁠B etter Intero p erab ility with Ac tive Direc to ry
⁠A p ac he Mo d ules fo r External Authentic atio n
⁠A uto mated s ud o Co nfig uratio n o n IPA Clients
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⁠N ew Pac kag e: g d k-p ixb uf2
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⁠P erfo rmanc e Co -Pilo t (PCP)
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⁠N ew Pac kag es : java-1.8 .0 -o p enjd k
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. . . . . . . . . . . Versions
Component
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Revision
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1
Red Hat Ent erprise Linux 6 6 .6 Release Not es
Preface
Red Hat Enterprise Linux minor releases are an aggregation of individual enhancement, security and
bug fix errata. The Red Hat Enterprise Linux 6.6 Release Notes documents the major changes made to
the Red Hat Enterprise Linux 6 operating system and its accompanying applications for this minor
release. D etailed notes on changes (that is, bugs fixed, enhancements added, and known issues
found) in this minor release are available in the Technical Notes. The Technical Notes document also
contains a complete list of all currently available Technology Previews along with packages that
provide them.
Important
The online Red Hat Enterprise Linux 6.6 Release Notes, which are located online here, are to be
considered the definitive, up-to-date version. Customers with questions about the release are
advised to consult the online Release and Technical Notes for their version of Red Hat
Enterprise Linux.
Capabilities and limits of Red Hat Enterprise Linux 6 as compared to other versions of the system are
available in the Knowledge Base article available at https://access.redhat.com/site/articles/rhel-limits.
Should you require information regarding the Red Hat Enterprise Linux life cycle, refer to
https://access.redhat.com/support/policy/updates/errata/.
2
⁠Chapt er 1 . Kernel
Chapter 1. Kernel
Enhanced SCSI Unit At t ent ion Handling
The kernel in Red Hat Enterprise Linux 6.6 has been enhanced to enable user space to respond to
certain SCSI Unit Attention conditions received from SCSI devices via the udev event mechanism. The
supported Unit Attention conditions are:
3F 03 INQUIRY D ATA HAS CHANGED
2A 09 CAPACITY D ATA HAS CHANGED
38 07 THIN PROVISIONING SOFT THRESHOLD REACHED
2A 01 MOD E PARAMETERS CHANGED
3F 0E REPORTED LUNS D ATA HAS CHANGED
Because SCSI Unit Attention conditions are only reported in response to a SCSI command, no
conditions are reported if no commands are actively being sent to the SCSI device.
Red Hat Enterprise Linux 6.6 does not provide any default udev rules for these events, but usersupplied udev rules can be written to handle them. For example:
ACTION=="change", SUBSYSTEM=="scsi",
ENV{SDEV_UA}=="INQUIRY_DATA_HAS_CHANGED", TEST=="rescan",
ATTR{rescan}="x"
causes a SCSI device to be rescanned if the inquiry data changes. The rules for the supported
events should match on the following SD EV_UA environment strings:
ENV{SDEV_UA}=="INQUIRY_DATA_HAS_CHANGED"
ENV{SDEV_UA}=="CAPACITY_DATA_HAS_CHANGED"
ENV{SDEV_UA}=="THIN_PROVISIONING_SOFT_THRESHOLD_REACHED"
ENV{SDEV_UA}=="MODE_PARAMETERS_CHANGED"
ENV{SDEV_UA}=="REPORTED_LUNS_DATA_HAS_CHANGED"
Note that in all cases the D EVPATH environment variable in the udev rule is the path of the device
that reported the Unit Attention. Also, multipath I/O currently verifies that multiple paths to a device
have some of the same attributes, such as the capacity. As a consequence, automatically rescanning
a device in response to a capacity change can cause that some paths to a device have the old
capacity and some paths have the new capacity. In such cases, multipath I/O stops using paths with
the capacity change.
Open vSwit ch Kernel Module
Red Hat Enterprise Linux 6.6 includes the Open vSwitch kernel module as an enabler for Red Hat's
layered products. Open vSwitch is supported only in conjunction with products that contain the
accompanying user-space utilities. Please note that without these required user-space utilities, Open
vSwitch will not function and cannot be enabled for use. For more information, please refer to the
following Knowledge Base article: https://access.redhat.com/knowledge/articles/270223.
libhuget lbfs Support for IBM Syst em z
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Red Hat Ent erprise Linux 6 6 .6 Release Not es
The l i bhug etl bfs library is now supported on IBM System z architecture. The library enables
transparent exploitation of large pages in C and C++ programs. Applications and middleware
programs can profit from the performance benefits of large pages without changes or recompilations.
Keywords for ipldev and condev in cio_ignore Available for IBM Syst em z
Red Hat Enterprise Linux 6.6 enables the use of keywords for the IPL device (ipldev) and console
device (condev) to make installation easier when a system uses the ci o _i g no re command to
blacklist devices. Allowing pre-defined CIO blacklists prevents problems in the following cases:
No default console device number is available at installation time.
There are no devices other than the IPL device as a base to clone Linux guests.
Performing ramdisk-based installations with no devices other than the CCW console.
4
⁠Chapt er 2 . Net working
Chapter 2. Networking
Changes t o HPN Add-On
Starting with Red Hat Enterprise Linux 6.6, the High Performance Networking (HPN) Add-On is no
longer be available as a separate product. Instead, the functionality found in the HPN Add-On has
been integrated into the base product and delivered as part of the Red Hat Enterprise Linux base
channel.
In addition to including the HPN functionality into the base Red Hat Enterprise Linux 6 product, the
RD MA over Converged Ethernet (RoCE) implementation has also been updated. RoCE uses Global
Identifier or GID -based addressing for node-to-node communication. Previously, GID s were encoded
based on the Ethernet interface's MAC address along with the VLAN ID (if used). Under certain
circumstances, the compute entity that runs the RoCE protocol is not aware that its traffic is VLANtagged. The compute entity can then sometimes create or assume a wrong GID , which can result in
connectivity problems. The updated RoCE implementation resolves this problem by changing the
way the RoCE GID s are encoded, and instead bases them off the IP addresses of the Ethernet
interface. All systems that use the RoCE protocol need to be upgraded to Red Hat
Enterprise Linux 6.6 to ensure connection reliability due to this change in the wire protocol format.
Please refer to this Red Hat Knowledge Base article for additional information:
https://access.redhat.com/site/articles/971333.
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Red Hat Ent erprise Linux 6 6 .6 Release Not es
Chapter 3. Security
SCAP Securit y Guide
The scap-security-guide package has been included in Red Hat Enterprise Linux 6.6 to provide
security guidance, baselines, and associated validation mechanisms that use Security Content
Automation Protocol (SCAP). SC AP Securi ty G ui d e contains the necessary data to perform
system security compliance scans regarding prescribed security policy requirements; both a written
description and an automated test (probe) are included. By automating the testing, SC AP Securi ty
G ui d e provides a convenient and reliable way to verify system compliance on a regular basis.
New libica APIs
Red Hat Enterprise Linux 6.6 introduces new libica library APIs for supported cryptographic modes,
including hardware and software indication. The APIs show cryptographic exploiters what
cryptographic functions are available and if hardware or software will be used to process
cryptographic requests. In the past, this information could only be obtained by using stand-alone
tools primarily intended for administrators.
6
⁠Chapt er 4 . Virt ualiz at ion
Chapter 4. Virtualization
New Packages: hyperv-daemons
New hyperv-daemons packages have been added to Red Hat Enterprise Linux 6.6. The new packages
include the Hyper-V KVP daemon, previously provided by the hypervkvpd package, the Hyper-V
VSS daemon, previously provided by the hypervvssd package, and the hv_fco py daemon,
previously provided by the hypervfcopyd package. The suite of daemons provided by hyperv-daemons
are needed when a Linux guest is running on a Microsoft Windows host with H yp er- V.
T echnology Preview: Red Hat Ent erprise Linux 6.6 Host ed as a Generat ion 2
Virt ual Machine
As a Technology Preview, Red Hat Enterprise Linux 6.6 can be used as a generation 2 virtual
machine in the Microsoft Hyper-V Server 2012 R2 host. In addition to the functions supported in the
previous generation, generation 2 provides new functions on a virtual machine; for example: boot
from a SCSI virtual hard disk, and UEFI firmware support.
7
Red Hat Ent erprise Linux 6 6 .6 Release Not es
Chapter 5. Storage
Enhancement s t o device-mapper
Several significant enhancements to d evi ce-mapper have been introduced in Red Hat
Enterprise Linux 6.6:
The d m-cache device-mapper target, which allows fast storage devices to act as a cache for
slower storage devices, has been added as a Technology Preview. See the lvmcache manual
page for more information.
The device-mapper-multipath ALUA priority checker no longer places the preferred path device in its
own path group if there are other paths that could be used for load balancing.
The fast_i o _fai l _tmo parameter in the mul ti path. co nf file now works on iSCSI devices in
addition to Fibre Channel devices.
Better performance can now be achieved in setups with a large number of multipath devices due
to an improved way in which the device-mapper multipath handles sysfs files.
A new fo rce_sync parameter in mul ti path. co nf has been introduced. The parameter
disables asynchronous path checks, which can help limit the number of CPU contention issues
on setups with a large number of multipath devices.
QSAM Access Met hod for Dat a sharing wit h z /OS - St age 1
Red Hat Enterprise Linux 6.6 introduces a new interface that enables Linux applications like D ata
Stage to access and process (read-only) data in physical sequential data sets owned by z/OS
without interfering with z/OS. By avoiding FTP or NFS transfer of data from z/OS, the turnaround time
for batch processing is significantly reduced.
dm-era T echnology Preview
The device-mapper-persistent-data package now provides tools to help use the new d m-era device
mapper functionality released as a Technology Preview. The d m-era functionality keeps track of
which blocks on a device were written within user-defined periods of time called an era. This
functionality allows backup software to track changed blocks or restore the coherency of a cache
after reverting changes.
8
⁠Chapt er 6 . Clust ering
Chapter 6. Clustering
keepalived Fully Support ed
The keepalived package is now fully supported. The keepalived package provides simple and robust
facilities for load-balancing and high-availability. The load-balancing framework relies on the wellknow and widely used Linux Virtual Server kernel module providing Layer4 network load-balancing.
The keepal i ved daemon implements a set of health checkers to load-balanced server pools
according to their state. The keepalived daemon also implements the Virtual Router Redundancy
Protocol (VRRP), allowing router or director failover to achieve high availability.
HAProxy Fully Support ed
The haproxy package is now fully supported. HAP ro xy is a stand-alone, layer-7, high-performance
network load balancer for TCP and HTTP-based applications which can perform various types of
scheduling based on the content of the HTTP requests.
CT DB Upgrade
Red Hat Enterprise Linux 6.6 contains a new version of the CTD B agent, in which some internal
operations have changed to improve stability and reliability. As a consequence, the new version
cannot be mixed with older versions running in parallel in the same cluster. To update CTD B in an
existing cluster, CTD B must be stopped on all nodes in the cluster before the upgrade starts, and the
nodes can then be updated one by one and started again.
9
Red Hat Ent erprise Linux 6 6 .6 Release Not es
Chapter 7. Hardware Enablement
Support for Int el Wildcat Point -LP PCH
Broadwell-U PCH SATA, HD Audio, TCO Watchdog, and I2C (SMBus) device ID s have been added
for the drivers, which enables support for the next generation mobile platform in Red Hat
Enterprise Linux 6.6.
Support for VIA VX900 Media Syst em Processor
VIA VX900 Media System Processor is supported in Red Hat Enterprise Linux 6.6.
10
⁠Chapt er 8 . Indust ry St andards and Cert ificat ion
Chapter 8. Industry Standards and Certification
FIPS 14 0 Revalidat ions
Federal Information Processing Standards Publications (FIPS) 140 is a U.S. government security
standard that specifies the security requirements that must be satisfied by a cryptographic module
utilized within a security system protecting sensitive, but unclassified information. The standard
provides four increasing, qualitative levels of security: Level 1, Level 2, Level 3, and Level 4. These
levels are intended to cover the wide range of potential applications and environments in which
cryptographic modules may be employed. The security requirements cover areas related to the
secure design and implementation of a cryptographic module. These areas include cryptographic
module specification, cryptographic module ports and interfaces; roles, services, and authentication;
finite state model; physical security; operational environment; cryptographic key management;
electromagnetic interference/electromagnetic compatibility (EMI/EMC); self-tests; design assurance;
and mitigation of other attacks.
The following targets have been fully validated:
NSS FIPS-140 Level 1
Suite B Elliptic Curve Cryptography (ECC)
The following targets have been revalidated:
OpenSSH (Client and Server)
Openswan
dm-crypt
OpenSSL
Suite B Elliptic Curve Cryptography (ECC)
Kernel Crypto API
AES-GCM, AES-CTS, and AES-CTR ciphers
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Red Hat Ent erprise Linux 6 6 .6 Release Not es
Chapter 9. Authentication and Interoperability
Bet t er Int eroperabilit y wit h Act ive Direct ory
Added functionality of System Securi ty Servi ces D aemo n (SSSD) enables better
interoperability of Red Hat Enterprise Linux clients with Active D irectory, which makes identity
management easier in Linux and Windows environments. The most notable enhancements include
resolving users and groups and authenticating users from trusted domains in a single forest, D NS
updates, site discovery, and using NetBIOS name for user and group lookups.
Apache Modules for Ext ernal Aut hent icat ion
A set of Apache modules has been added to Red Hat Enterprise Linux 6.6 as a Technology Preview.
The mo d _authnz_pam, mo d _i ntercept_fo rm_submi t, and mo d _l o o kup_i d enti ty Apache
modules in the respective packages can be used by Web applications to achieve tighter interaction
with external authentication and identity sources, such as Identity Management in Red Hat Enterprise
Linux.
Aut omat ed sudo Configurat ion on IPA Client s
In Red Hat Enterprise Linux 6.6, the i pa-cl i ent-i nstal l script configures the sud o utility on IPA
clients by default. FreeIPA sudo integration is a widely popular feature, which can, however, pose
some configuration challenges. The integration is now seamless, and i pa-cl i ent-i nstal l
leverages a newly added IPA provider in sssd.
12
⁠Chapt er 1 0 . Deskt op and G raphics
Chapter 10. Desktop and Graphics
New Package: gdk-pixbuf2
The gdk-pixbuf2 package, previously a part of the gtk2 package, has been added to Red Hat
Enterprise Linux 6.6. The gdk-pixbuf2 package contains an image-loading library that can be
extended by loadable modules for new image formats. The library is used by toolkits such as GTK+
or Clutter. Note that downgrading the libraries included in the gdk-pixbuf2 and gtk2 packages can fail.
13
Red Hat Ent erprise Linux 6 6 .6 Release Not es
Chapter 11. Performance and Scalability
Performance Co-Pilot (PCP)
Performance Co-Pilot (PCP) provides a framework and services to support system-level performance
monitoring and management. Its light-weight, distributed architecture makes it particularly well-suited
to centralized analysis of complex systems.
Performance metrics can be added using the Python, Perl, C++ and C interfaces. Analysis tools can
use the client APIs (Python, C++, C) directly, and rich web applications can explore all available
performance data using a JSON interface.
For further information, consult the extensive manual pages in the pcp and pcp-libs-devel packages.
The pcp-doc package installs comprehensive documentation in the /usr/share/d o c/pcp-d o c/*
directory. PCP also provides a manual page for every tool; type man toolname on the command
line to view the manual page for that tool.
14
⁠Chapt er 1 2 . G eneral Updat es
Chapter 12. General Updates
New Packages: java-1.8.0-openjdk
New java-1.8.0-openjdk packages, which contain the OpenJD K 8 Java Runtime Environment and the
OpenJD K 8 Java Software D evelopment Kit, are now available in Red Hat Enterprise Linux 6.6 as a
Technology Preview.
15
Red Hat Ent erprise Linux 6 6 .6 Release Not es
Component Versions
This appendix is a list of components and their versions in the Red Hat Enterprise Linux 6.6 release.
T ab le A.1. C o mp o n en t Versio n s
C o mp o n en t
Versio n
Kernel
QLogic q l a2xxx driver
QLogic ql2xxx firmware
2.6.32-494
8.07.00.08.06.6-k
ql23xx-firmware-3.03.27-3.1
ql2100-firmware-1.19.38-3.1
ql2200-firmware-2.02.08-3.1
ql2400-firmware-7.03.00-1
ql2500-firmware-7.03.00-1
Emulex l pfc driver
iSCSI initiator utils
D M-Multipath
LVM
16
10.2.8020.1
iscsi-initiator-utils-6.2.0.873-11
device-mapper-multipath-libs-0.4.9-80
lvm2-2.02.108-1
Revision Hist ory
Revision History
R evisio n 0.0- 0.4
T u e O ct 14 2014
Release of the Red Hat Enterprise Linux 6.6 Release Notes.
Milan N avrát il
17