RHCE - RH302 Red Hat Certified Engineer Certification Exam Preparation Course in a Book for Passing the RHCE - RH302 Red Hat Certified Engineer Exam - The How To Pass on Your First Try Certification Study Guide - Second Edition

Jason Hall

Description

The first edition of this Book is regarded as a classic in its field. Now, in an expanded and updated version of this bestselling book, the author once again presents a step-by-step guide to RHCE Certification.

This self-study exam preparation guide for the RHCE - RH302 Red Hat Certified Engineer exam contains everything you need to test yourself and pass the Exam. Including all the exam topics, covered indepth and insider secrets, complete explanations of all RHCE subjects, test tricks and tips, over 250 highly realistic sample questions, and exercises designed to strengthen understanding of the RHCE concepts and prepare you for exam success on the first attempt are provided.

Can you imagine valuing a book so much that you send the author a "Thank You" letter?

This book includes new exercises and sample questions never before in print. Offering numerous sample questions, critical time-saving tips plus information available nowhere else, this book will help you pass the RHCE - RH302 Red Hat Certified Engineer exam on your FIRST try.

Buy this. Read it. And Pass the RHCE - RH302 Red Hat Certified Engineer Exam.

This book provides a laser sharp focus on all the exam objectives with a cohesive, concise, yet comprehensive coverage of all the topics included in the RHCE - RH302 Red Hat Certified Engineer Lab Exam.

It includes over 250 questions modeled after the real exam with answers and an Exam Quick Prep feature which recaps all the important points for the last hour preparation before taking the exam.

Covers all RH302 exam topics, including:

* Hardware installation and configuration

* The boot process

* Linux filesystem administration

* Package management and Kickstart

* User and group administration

* System administration tools

* Kernel services and configuration

* Apache and Squid

* Network file sharing services (NFS, FTP, and Samba)

* Domain Name System (DNS)

* E-mail (servers and clients)

* Extended Internet Services Daemon (xinetd), the Secure package, and DHCP

* The X Window System

* Firewalls, SELinux, and troubleshooting

Sujets

• Certification Guides
• Computers
• Informatique

Informations

• Publié par: Emereo Publishing
• Date de parution: 24 octobre 2012
• Nombre de lectures: 0
• EAN13: 9781486431557
• Langue: English
• Poids de l'ouvrage: 4 Mo

Extrait

RHCE–RH302 Red Hat Certified Engineer Certification Exam Preparation Guide Second Edition

Copyright © Notice of Rights All rights reserved. No part of this book may be reproduced or transmitted in any form by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. Notice of Liability The information in this book is distributed on an “As Is” basis without warranty. While every precaution has been taken in the preparation of the book, neither the author nor the publisher shall have any liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or indirectly by the instructions contained in this book or by the products described in it. Trademarks Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and the publisher was aware of a trademark claim, the designations appear as requested by the owner of the trademark. All other product names and services identified throughout this book are used in editorial fashion only and for the benefit of such companies with no intention of infringement of the trademark. No such use, or the use of any trade name, is intended to convey endorsement or other affiliation with this book.

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This self-study exam preparation guide for the RHCE - RH302 Red Hat Certified Engineer exam contains valuable information to assist you in passing the Exam. It includes all the exam topics, over 250 sample questions, and exercises designed to strengthen understanding of the RHCE concepts and prepare you for exam success on the first attempt. Covers all RH302 exam topics, including: installation and configuration Hardware  The boot process  Linux filesystem administration management and Kickstart Package and group administration User  System administration tools  Kernel services and configuration  Apache and Squid  Network file sharing services (NFS, FTP, and Samba) Name System (DNS) Domain (servers and clients) E-mail  Extended Internet Services Daemon (xinetd), the Secure package, and DHCP  The X Window System  Firewalls, SELinux, and troubleshooting.

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1 Contents 1CONTENTS .............................................................................................................................. 5 2WHAT IS RED HAT CERTIFIED ENGINEER? ............................................................................. 10 2.1O VERVIEW ................................................................................................................................ 10 2.1.1What is the goal of RHCE Certification? ....................................................................... 10 2.2T HE RHCEE XAM ....................................................................................................................... 10 2.2.1What are the benefits of getting certified by Red Hat? ............................................... 11 2.2.211What is the Verification and Validity Period? .............................................................. 2.2.311When should I consider getting re-certified? ............................................................... 3INSTALLATION AND HARDWARE CONFIGURATION .............................................................. 12 3.1O VERVIEW ................................................................................................................................ 12 3.2I NSTALLATION ............................................................................................................................ 12 3.2.1Using DVD .................................................................................................................... 12 3.2.2............................................................................................................ 13Using Hard Disk 3.2.3Using Network ............................................................................................................. 14 3.3K ICKSTART F ILE .......................................................................................................................... 14 3.3.1................................................................................................... 14Creating Kickstart file 3.3.2Use of Kickstart file ...................................................................................................... 16 3.4C ONFIGURING H ARDWARE ........................................................................................................... 17 3.4.1Graphical utilities ......................................................................................................... 18 4THE BOOT PROCESS .............................................................................................................. 24 4.1O VERVIEW ................................................................................................................................ 24 4.2G RUB ....................................................................................................................................... 24 4.2.1Grub configuration file ................................................................................................. 24 4.2.2Configuring Grub.......................................................................................................... 25 4.3S TARTING INIT ............................................................................................................................ 27 4.3.1............................................................................................................ 27./etc/inittab file 4.3.2runlevel ........................................................................................................................ 30 4.3.3Initializing System ........................................................................................................ 31 STARTING SERVICES....................................................................................................................... 31 4.3.4........................................................................................... 33Using command chkconfig 4.4U SING G RAPHICAL UTILITIES ......................................................................................................... 35 5FILESYSTEM ADMINISTRATION ............................................................................................. 37 5.1O VERVIEW ................................................................................................................................ 37 5.2F ILESYSTEM I NFORMATION ........................................................................................................... 37 5.2.1./etc/fstab file .............................................................................................................. 37 Copyright The Art of Service org Email:[e-mail]│Web:http://theartofservice.com│eLearning:http://theartofservice. 5

5.2.2./etc/mtab.................................................................................................................... 38 5.2.339Mounting a filesystem ................................................................................................. 5.2.4Unmounting a filesystem ............................................................................................. 39 5.2.5Creating a filesystem.................................................................................................... 40 5.3C REATING S WAP SPACE ............................................................................................................... 41 5.3.1Enabling swap space .................................................................................................... 42 5.3.2Disabling swap space ................................................................................................... 42 5.4C HECKING AND R EPAIRING A FILESYSTEM ........................................................................................ 43 5.4.1Searching for badblocks ............................................................................................... 44 5.5A UTOMATICALLY MOUNTING A FILESYSTEM ..................................................................................... 44 5.5.1Checking status of automount ..................................................................................... 45 5.6RAID DISKS ............................................................................................................................... 46 5.6.1Creating RAID device.................................................................................................... 46 5.7L OGICAL V OLUME G ROUP ............................................................................................................ 48 5.7.1Creating A Logical Volume Group ................................................................................ 48 5.7.2Remove a logical volume ............................................................................................. 50 5.7.3Remove a volume group .............................................................................................. 50 5.7.4........................................................................................... 50Remove a physical volume 5.7.5Logical volume management utility............................................................................. 51 6PACKAGE MANAGEMENT ..................................................................................................... 52 6.1O VERVIEW ................................................................................................................................ 52 6.2U SING YUM ............................................................................................................................... 52 6.3U SING RPM ............................................................................................................................... 54 6.4U SING MAKE ............................................................................................................................. 56 6.5P ACKAGE M ANAGER ................................................................................................................... 56 7USER AND GROUP ADMINISTRATION ................................................................................... 58 7.1O VERVIEW ................................................................................................................................ 58 7.2C REATING U SER A CCOUNT ........................................................................................................... 58 7.2.1General format............................................................................................................. 61 7.2.2Changing default values............................................................................................... 61 7.3M ODIFYING USER ACCOUNT ......................................................................................................... 62 7.4D ELETING USER ACCOUNT ............................................................................................................ 62 7.5G ROUP A DMINISTRATION ............................................................................................................ 62 7.5.1....................................................................................................... 62Adding New Group 7.5.2Modifying group information....................................................................................... 63 7.5.3Deleting group ............................................................................................................. 63 7.6U SING U SER M ANAGER ............................................................................................................... 63 7.6.1Changing user password .............................................................................................. 65 7.7S PACE U SAGE ............................................................................................................................ 65 8SYSTEM ADMINISTRATION ................................................................................................... 67 8.1O VERVIEW ................................................................................................................................ 67 8.2G ETTING A DMINISTRATION R IGHTS ................................................................................................ 67 Copyright The Art of Service  Email:[e-mail]│Web:http://theartofservice.com│eLearning:http://theartofservice.org 6

8.2.1.......................................................................................................... 67The su command 8.2.2Using the su.................................................................................................................. 67 8.2.3Administrative commands ........................................................................................... 68 8.2.4etc/sudoers file............................................................................................................. 68 8.3C HANGING OWNER AND GROUP .................................................................................................... 69 8.4M ONITORING S YSTEM PERFORMANCE ............................................................................................ 70 8.4.1.................................................................................................. 70Using System Monitor 8.4.2Using top ...................................................................................................................... 72 8.4.3Other commands ......................................................................................................... 73 8.5L OG INFORMATION ..................................................................................................................... 74 9KERNEL SERVICES AND CONFIGURATION ............................................................................. 76 9.1O VERVIEW ................................................................................................................................ 76 9.2K ERNEL M ODULES ...................................................................................................................... 76 9.2.1Modules Loaded into Kernel ........................................................................................ 76 9.2.2Inserting module into kernel ........................................................................................ 77 9.2.3Removing module from kernel ..................................................................................... 77 9.2.477Using modprobe command.......................................................................................... 9.3P ROCESS AND K ERNEL I NFORMATION ............................................................................................. 78 9.3.1.......................................................................................................... 78The ps command 9.3.278Changing priority of process ........................................................................................ 9.3.3Using dmesg................................................................................................................. 79 9.3.4Syslogd ......................................................................................................................... 79 9.4A UTOMATING T ASKS ................................................................................................................... 81 9.4.1Using at ........................................................................................................................ 81 9.4.283Using batch command ................................................................................................. 9.4.3Using cron .................................................................................................................... 84 10WEB SERVER......................................................................................................................... 86 10.1O VERVIEW ........................................................................................................................... 86 10.2S TARTING A PACHE ................................................................................................................. 86 10.3M AIN C ONFIGURATION FILE ..................................................................................................... 88 10.3.188Global Environment Configuration.......................................................................... 10.3.289Main server section ................................................................................................. 10.3.3Virtual hosts section ................................................................................................ 91 10.4HTTPS ERVER C ONFIGURATION ............................................................................................... 91 11...................................................................................................................... 97SQUID SERVER 11.1O VERVIEW ........................................................................................................................... 97 11.2C ONFIGURING S QUID ............................................................................................................. 97 11.2.1...................................................................................................... 97Network options 11.2.2Neighbor selection algorithm option ...................................................................... 97 11.2.3Cache size options ................................................................................................... 97 11.2.4Log File and Cache directory section ....................................................................... 98 11.2.5Access control section ............................................................................................. 98 Copyright The Art of Service  Email:[e-mail]│Web:http://theartofservice.com│eLearning:http://theartofservice.org 7

11.2.6Administrative parameters ..................................................................................... 99 11.3C ACHE M ANAGER .................................................................................................................. 99 11.4S QUID D AEMON .................................................................................................................. 100 12NFS SERVER ........................................................................................................................ 101 12.1O VERVIEW ......................................................................................................................... 101 12.2S TARTING NFS SERVICE ........................................................................................................ 101 12.2.1101Format of hostname.............................................................................................. 12.2.2102Options format ...................................................................................................... 12.3A CCESSING THE NFS DIRECTORY ............................................................................................. 103 12.4NFSS ERVER C ONFIGURATION ................................................................................401................ 12.5U SING NFSSTAT ................................................................................................................... 105 13SAMBA SERVER .................................................................................................................. 107 13.1O VERVIEW ......................................................................................................................... 107 13.2S AMBA S ERVER C ONFIGURATION ............................................................................................ 107 13.3S AMBA CONFIGURATION FILE ................................................................................................. 111 13.4S TARTING S AMBA SERVICE ..................................................................................................... 112 13.4.1.............................................................................................. 112Checking the service 14FTP SERVER ........................................................................................................................ 114 14.1O VERVIEW ......................................................................................................................... 114 14.2S TARTING VSFTD .................................................................................................................. 114 14.3C ONFIGURING VSFTPD .......................................................................................................... 114 14.4 FTP COMMAND PROMPT ....................................................................................................... 115 14.5V ERY S ECURE FTP DAEMON C ONFIGURATION ........................................................................... 117 15...................................................................................................................... 119LDAP SERVER 15.1O VERVIEW ......................................................................................................................... 119 15.2C ONFIGURATION ................................................................................................................. 119 THE SCHEMA DIRECTORY CONTAINS THE SCHEMA FILES. THE VARIOUS SCHEMA FILES ARE: ......120 15.3S TARTING THE LDAP ............................................................................................................. 121 15.4O VERVIEW ......................................................................................................................... 121 15.5S ETTING NIS DOMAIN NAME .................................................................................................. 121 15.6C ONFIGURING NIS............................................................................................................... 122 15.7S TARTING NIS SERVER .......................................................................................................... 122 15.7.1Staring NIS server .................................................................................................. 122 15.7.2Starting ypbind service .......................................................................................... 122 15.8M APPING I NFORMATION ....................................................................................................... 123 15.8.1124NIS database ......................................................................................................... 16DHCP SERVER ..................................................................................................................... 124 16.1O VERVIEW ......................................................................................................................... 124 16.2S TARTING THE DHCP SERVER 24.........................1........................................................................ 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16.3C ONFIGURATION FILE ............................................................................................................ 124 16.4W ORKING OF DHCP SERVER .................................................................................................. 125 16.5DHCP CLIENT ..................................................................................................................... 125 17DNS SERVER ....................................................................................................................... 127 17.1O VERVIEW ......................................................................................................................... 127 17.2S TARTING N AMED DAEMON .................................................................................................. 127 17.3BINDC ONFIGURATION GUI.................................................................................................. 127 17.4I MPORTANT FILES ................................................................................................................. 129 18MAIL SERVICES ................................................................................................................... 131 18.1O VERVIEW ......................................................................................................................... 131 18.2S ENDMAIL .......................................................................................................................... 131 18.2.1etc/mail ................................................................................................................. 131 18.2.2133Important Files ...................................................................................................... 18.3P OSTFIX ............................................................................................................................. 134 18.3.1Starting postfix server ........................................................................................... 134 18.3.2134Configuration file................................................................................................... 18.4S WITCHING MTA ................................................................................................................ 136 18.5D OVECOT ........................................................................................................................... 136 18.5.1Starting Dovecot.................................................................................................... 137 18.5.2137Configuration file................................................................................................... 19NETWORK SECURITY........................................................................................................... 139 19.1O VERVIEW ......................................................................................................................... 139 19.2T HE DAEMON XINETD ........................................................................................................... 139 19.3U SING TCP WRAPPERS ......................................................................................................... 140 19.3.1etc/hosts.allow ...................................................................................................... 140 19.3.2etc/hosts.deny ....................................................................................................... 140 19.4S ECURITY L EVEL C ONFIGURATION ........................................................................................... 141 19.4.1Configuration files ................................................................................................. 143 19.5C OMMAND R EFERENCE ......................................................................................................... 144 20PAM AND SELINUX ............................................................................................................. 145 20.1PAM ................................................................................................................................ 145 20.2 ETC / PAM . D ......................................................................................................................... 145 20.3SEL INUX ............................................................................................................................ 146 20.3.1SELinux administration.......................................................................................... 146 20.4C OMMAND R EFERENCE ......................................................................................................... 148 21OVER 250 EXAM PREPARATION QUESTIONS ...................................................................... 149 22ANSWERS ........................................................................................................................... 195

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2 What is Red Hat Certified Engineer?

2.1 Overview

Red Hat Certified Engineer (RHCE) is a performance-based test that measures actual competency on live systems. Called the "crown jewel of Linux certifications," RHCE proves an individual's ability to configure networking services and security on servers running a Red Hat OS. RHCE was recently named the hottest certification in all of IT by CertCities.com.

2.1.1 What is the goal of RHCE Certification?

The primary goal of RHCE and RHCT certification is to meet the demand of individuals and employers for useful metrics of individual skills and competencies with Red Hat Linux, the largest-selling distribution of Linux. The RHCE Program provides performance-based certification at two critical job role levels: Technician (RHCT) and Engineer (RHCE).

2.2 The RHCE Exam

Becoming a Red Hat Certified Engineer requires passing a3.5 hourhands-on exam. There are four different approaches to preparing for the exam depending on your existing level of Linux expertise. These are the Standard Track, Rapid Track, Success Pack and Live Access Labs. To determine your level of expertise, you can take the pre-assessment questionnaire at https://www.redhat.com/apps/training/assess/.

There is no prerequisite for taking the exam, but it is recommended students have substantial real world system administration experience before making an attempt.

The RHCE exam is performance-based in two very specific and important senses. First, the actual performance of candidates is tested by requiring them to successfully complete installation, configuration, troubleshooting, and maintenance tasks similar to those they must complete on the job as system Copyright The Art of Service  Email:[e-mail]│Web:http://theartofservice.com│eLearning:http://theartofservice.org 10