Red Hat APPLICATION STACK 1.2 RELEASE User Manual Page 9
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Chapter 1.
1
Introduction
The Migration Planning Guide documents the migration of any minor version of a Red Hat Enterprise
Linux 5 installation to Red Hat Enterprise Linux 6 by highlighting key behavioral changes worthy of
note when migrating.
This guide is intended to increase ease of use of Red Hat Enterprise Linux 6 by providing guidelines
for changes in the product between Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6. This
guide is however not designed to explain all new features: it is focused on changes to the behavior of
applications or components which were part of Red Hat Enterprise Linux 5 and have changed in Red
Hat Enterprise Linux 6 or whose functionality has been superseded by another package.
1.1. Red Hat Enterprise Linux 6
Red Hat Enterprise Linux is the leading platform for open source computing. It is sold by subscription,
delivers continuous value and is certified by top enterprise hardware and software vendors. From the
desktop to the datacenter, Enterprise Linux couples the innovation of open source technology and the
stability of a true enterprise-class platform.
Red Hat Enterprise Linux 6 is the next generation of Red Hat's comprehensive suite of operating
systems, designed for mission-critical enterprise computing and certified by top enterprise software
and hardware vendors. This release is available as a single kit on the following architectures:
• i386
• AMD64/Intel64
• System z
• IBM Power (64-bit)
In this release, Red Hat brings together improvements across the server, systems and the overall Red
Hat open source experience. The following are some of the many improvements and new features that
are included in this release:
Power Management
Tickless kernel and improvements through the application stack to reduce wakeups, power
consumption measurement by PowerTOP, Power Management (ASPM, ALPM), and adaptive system
tuning by Tuned.
Next Generation Networking
Comprehensive IPv6 support (NFS 4, CIFS, mobile support [RFC 3775], ISATAP support), FCoE,
iSCSI, and a new and improved mac80211 wireless stack.
Reliability, Availability, and Serviceability
System level enhancements from industry collaborations to make the most of hardware RAS
capabilities and NUMA architectures.
Fine-grained Control and Management
Improved scheduler and better resource management in the kernel via Completely Fair Scheduler
(CFS) and Control Groups (CG).
- Red Hat Enterprise Linux 6 1
- Migration Planning Guide 1
- Edition 1.1 2
- 1. Document Conventions 5
- 1.2. Pull-quote Conventions 6
- 2. We Need Feedback! 7
- Introduction 9
- Scalable Filesystems 10
- Virtualization 10
- Installation 13
- 2.2.2.1. Behavioral Changes 14
- 2.2.2.2. Command Changes 15
- 2.2.2.3. Packages Changes 15
- 2.2.2.5. Syntax Changes 16
- 2.2.2.4. Script Changes 16
- 2.2.3. Networking 17
- 2.3. Text-Based Installer 18
- Storage and File Systems 19
- 3.2. ext4 20
- 3.3. blockdev 20
- Networking and Services 21
- 4.3. IPTables/Firewalls 22
- 4.4. BIND 22
- 4.5. NTP 23
- 4.6. Kerberos 23
- 4.7. Mail 24
- 4.8. MySQL® 25
- 4.9. PostgreSQL 25
- 4.10. Drupal 25
- 4.11. Squid 25
- 4.12. Bluetooth 26
- 4.13. Cron 26
- 4.14. Logging 27
- Command Line Tools 29
- GDM Configuration 31
- Security and Authentication 33
- 7.4. Checksums 34
- 7.6. System Users 34
- 8.1. Kernel 35
- Package And Driver Changes 37
- Regular Expressions 39
- 9.3. Other Package Changes 40
- 9.4. Driver Changes 41
- 9.5. Library Changes 42
- Appendix A. Revision History 43
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