Test-Driven Infrastructure With Chef
Stephen Nelson-Smith
Learning Scala: Practical Functional Programming for the JVM
Jason Swartz
RHSA III
Wander Boessenkool, Chen Chang, Will Dinyes, George Hacker, ...
Red Hat System Administration (3)
Pro Apache Hadoop
Sameer Wadkar & Jason Venner
Time Management for System Administrators
Thomas A. Limoncelli
RT Essentials
Richard Foley