Jang Michael H. - RHCSA/RHCE Red Hat Linux certification study guide: exams (EX200 & EX300)

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For the young widows and widowers:
may they find the courage to face their fears,
to navigate their way through the pain,
and to find hope for a brighter future.

Michael Jang (RHCE, LPIC-2, UCP, LCP, Linux+, MCP) is currently a Senior Technical Writer for ForgeRock. His experience with computers goes back to the days of jumbled punch cards. He has written other books on Linux certification, including LPIC-1 in Depth, Mike Meyers Linux+ Certification Passport, and Sair GNU/Linux Installation and Configuration Exam Cram. His other Linux books include Linux Annoyances for Geeks, Linux Patch Management, and Mastering Fedora Core Linux 5. He has also written or contributed to books on Microsoft operating systems, including MCSE Guide to Microsoft Windows 98 and Mastering Windows XP Professional, Second Edition.

Alessandro Orsaria (RHCE, RHCA, CCIE x 2) is an IT professional with more than 15 years experience in the industry. He has authored articles for technical Linux magazines and is currently employed by a global equity hedge fund as an IT Infrastructure Architect. Alessandro is Red Hat RHCE and RHCA certified and has achieved two Cisco CCIE certifications in Routing & Switching and Datacenter. He holds an MBA from Imperial College of London and a degree in physics.

Alex Davies works for a proprietary trading firm, where he is responsible for Linux systems and manages a team of Linux engineers across Chicago, New York, London, and Singapore. Alex is the author of MySQL Clustering and MySQL High Availability Cookbook. Earlier in his career he was both RHCE and RHCA certified and received the RHCE of the Year award in 2009 from Red Hat. Alex also holds a degree in economics from the University of Durham.

Id like to thank Mark Craig and Jamie Nelson of ForgeRock for supporting my efforts to update this book. Id also like to thank Alessandro Orsaria for taking on the work required to update this book. We would not have a Seventh Edition without him. Most importantly for me, Id like to thank my sweet wife, Donna; you are the love of my life.

Mike Jang

First, I owe a huge debt of gratitude to Mike Jang and Tim Green for giving me the opportunity to work on the Seventh Edition of this book. More people have contributed than I can possibly mention here, but I must thank Conor Kiernan and Neil Jones at Marshall Wace for their encouragement and support. I also owe a lot to Alex, Koti, and Vlad, who helped me in many ways to get where I am today. Last but certainly not least, thank you, Julia, for your patience and sweetness while I was working on this project.

Alessandro Orsaria

Thanks to all the incredibly hard-working folks at McGraw-HillAmy Stonebraker, Tim Green, LeeAnn Pickrell, Jody McKenzie, Bart Reed, and Jim Kussowfor their help in launching a great series and being solid team players.

L inux is thriving. Red Hat is at the forefront of the Linux revolution. And Red Hat Certified System Administrators (RHCSA) and Engineers (RHCE) are making it happen.

Even in the current economic recovery, business, education, and governments are cost conscious. They want control of their operating systems. Linuxeven Red Hat Enterprise Linuxsaves money. The open-source nature of Linux allows users to control and customize their operating systems to a higher degree than other systems. While there is a price associated with Red Hat Enterprise Linux (RHEL), the cost includes updates and support. With KVM, its possible to set up a cluster of virtual, independent installations of RHEL (and other operating systems) on a single physical computer. Many companies have already converted rooms full of physical systems into closets of just a few systems, each configured with banks of virtual machines. As an RHCSA and an RHCE, you can join in that revolution.