Base Users Guide: 
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Same Code base for CentOS 5 and CentOS 6 Systems
While there are significant differences beteween CentOS 5 and CentOS 6, Rocks now supports both from the same source code. 5 and 6 Rolls are not interchangeable .
KVM Roll (virtualization)for CentOS 6 64-bit Systems
Xen is no longer supported by RedHat/CentOS 6 system and KVM (Kernel Virtual Machine) is only supported for 64-bit machines. KVM is hardware-only virtualization and requires both capability and BIOS to be enabled.
Environment Modules
CentOS 6 natively supports environment modules instead of *-selector. For Rocks 5.5, the indentical version of modules is compiled and included in the base roll.
New support for Yum repositories
Standard OS-defined Repositories are no longer removed, but are instead disabled. the command yum repolist all, describes configured repos.
Selectable Public and Private Networks at Install
Users are no longer required to select eth0 as the private and eth1 as the public networks for frontend installation. Install screens have drop-down menus to select the detected interface.
Support of BIOS-named Ethernet devices
Version 6 kernels name Ethernet devices differently from Version 5. Devices may have names like p2p1, p35p2, and/or eth0. If you prefer standard device names for 6, you must install a node using the standard kernel flag of biosdevname=0
Support of Frontends with One Physical Interface
The installer will configure a logical Ethernet device (e.g. eth0:0) if only one physical network device is detected during frontend installation.
Creation of Upstart Scripts for CentOS 6
CentOS 6 use upstart to define to boot characteristics
New Command: rocks report post
rocks report post will convert the post section of an xml file to an executable shell script. This is an advanced user feature.
New Package: foundation-sqlite
This implements the SQLite3 single file database. See Upgraded Tracker.
Base: Updated anaconda
Base: Built against CentOS 5.8/6.2 with Updates as of May 8, 2012
Base: Java Updated to Version 7 Update 3
Base: Eclipse Moved to Java Roll and Updated to version 3.7.1
Base: Profile scripts only add once to PATH variables
Base: rocks run host localhost performs a fork instead of an ssh.
Base: Utilize subprocess and hashlib for newer version of Python
Base: Improve performance of report host dhcpd by nearly a factor of 10 on large clusters.
Base: Added Git RPM.
Base: Really fixed Zombie Processes in 411 service
Base: Patched foundation-python to remove a requirement on /usr/local/bin/python.
Base: Updated Version of M2Crypto to 0.21.1
Base: Better Bootstrapping support for building Rocks. Supports "bootstrap0" which starts on a bare OS install. Use yum whenever possible in package installation.
Base: Removed rebuild of Kudzu. CentOS fixed their internal build problems.
Base: Only have 32-bit or 64-bit version of Java. Not both. Works around broken Oracle-supplied RPMs where only one can be installed.
Base: Fixed various graph ordering issues.
HPC: Use environment modules. Set rocks-openmpi as default MPI Module
HPC: Added PVM RPMs for Version 6. PVM dropped from Native OS.
HPC: OpenMPI compiled with SGE integration
Ganglia: Updated profile.d scripts to only add once to PATH
Ganglia: rrdtool renamed to foundation-rrdtool to avoid conflicts with external reposistories.
Ganglia: Removed a Package Conflict with ganglia-pylib
Ganglia: Insured that ganglia linkes with Rocks-compiled rrdtool
Java: Eclipse updated to 3.7.1
Java: JBOSS updated to 6.1.0. Version 5 was deprecated and would not build on CentOS 6
Kernel: Rewrote the rocks tracker to use SQLite for storing hashes. Eliminated segmentation faults of older code.
Kernel: handle difference between syslog and rsyslog
Kernel: build keyutils only on 5, not on 6.
SGE: Added Security Patched to Open Grid Scheduler v6.2 update 5p3
SGE: Fix compilation to work on both 5.8 and 6.2
Bio: Many build fixes for Perl modules.
Bio: Extracted profile scripts to an RPM for easier management
Bio: mpi-blast compiled with the rocks-opemmpi module loaded
Bio: BioPerl now depends on Perl Roll
Bio: BioPerl CPAN support utils updated
Condor: Update Condor to v7.6.6
Condor: No support for CentOS 6/32-bit.
Condor: Install simple condor test.