flast.indd xviii 1/8/2013 10:40:14 AM Red Hat ® Enterprise Linux 6 Administration ® Real World Skills for Red Hat Administrators Sander van Vugt ffirs.indd i 1/8/2013 10:39:59 AM Senior Acquisitions Editor: Jeff Kellum Development Editor: Gary Schwartz Technical Editors: Floris Meester, Erno de Korte Production Editor: Rebecca Anderson Copy Editor: Kim Wimpsett Editorial Manager: Pete Gaughan Production Manager: Tim Tate Vice President and Executive Group Publisher: Richard Swadley Vice President and Publisher: Neil Edde Book Designer: Judy Fung and Bill Gibson Proofreaders: Louise Watson and Jennifer Bennett, Word One New York Indexer: J & J Indexing Project Coordinator, Cover: Katherine Crocker Cover Designer: Ryan Sneed Cover Image: © Jacob Wackerhausen / iStockPhoto Copyright © 2013 by John Wiley & Sons, Inc., Indianapolis, Indiana Published simultaneously in Canada ISBN: 978-1-118-30129-6 ISBN: 978-1-118-62045-8 (ebk.) ISBN: 978-1-118-42143-7 (ebk.) ISBN: 978-1-118-57091-3 (ebk.) No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at http://www.wiley.com/go/permissions. Limit of Liability/Disclaimer of Warranty: The publisher and the author make no representations or warranties with respect to the accuracy or completeness of the contents of this work and specifically disclaim all warranties, including