Cent OS Bible Ebook PDF Tutorials how to become Pro

Introduction

With the CentOS operating system and the instructions provided in this book, you can
transform your computers into free, safe, and powerful enterprise-class systems. Not
only can you configure your server to share files, printers, web pages, or directory
services to other computers, but you can also use CentOS on everyday workstations as well to
benefit from its security and stability.
Because CentOS includes enterprise-class software, the skills you learn by using CentOS can be
applied to work with the largest, most secure, and most diverse Linux systems in the world.
Using this book is a great start for becoming a Linux professional.




Contents:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxv
Part I Getting Started
Chapter 1: An Overview of CentOS . . . . . . . . . . . . . . . . . . . . . 3
What You Get with CentOS .........................................................................................5
Stepping Stone to Red Hat Enterprise Linux ...............................................................6
What Is Linux? ......................................................................................................................7
Linux’s Roots in UNIX .........................................................................................................7
Common Linux Features ...................................................................................................10
Primary Advantages of Linux ...........................................................................................11
Going Forward with CentOS ............................................................................................12
Help from the CentOS Project ....................................................................................12
Training and Certification ...........................................................................................13
Documentation ............................................................................................................13
Summary ..............................................................................................................................14
Chapter 2: Installing CentOS . . . . . . . . . . . . . . . . . . . . . . . . 15
Using the CentOS Live CD ................................................................................................16
Quick Installation ..............................................................................................................17
Detailed Installation Instructions ...................................................................................18
Installing CentOS 5 .....................................................................................................19
Choosing Computer Hardware ...................................................................................21
Preparing for Installation Using the Live CD .............................................................22
Beginning the Installation ...........................................................................................25
Running CentOS Firstboot ..........................................................................................32
Going Forward after Installation .................................................................................34
Special Installation Procedures .......................................................................................35
Alternatives for Starting Installation ...........................................................................35
Installing from Other Media .......................................................................................37
Starting a VNC Install .................................................................................................40
Performing a Kickstart Installation .............................................................................41

xi

Contents

Special Installation Topics ...............................................................................................46
Setting up to Dual-Boot Linux and Windows ............................................................46
Partitioning Your Disks ...............................................................................................52
Using the GRUB Boot Loader .....................................................................................60
Troubleshooting Installation ............................................................................................65
Summary ..............................................................................................................................67
Chapter 3: Getting Started with the Desktop . . . . . . . . . . . . . . . . 69
Logging in to CentOS .........................................................................................................69
Getting Familiar with the Desktop .................................................................................72
Touring Your Desktop ................................................................................................72
Tips for Configuring Your Desktop ............................................................................79
Using the GNOME Desktop ..............................................................................................80
Using the Metacity Window Manager ........................................................................81
Using the GNOME Panels ...........................................................................................83
Using the Nautilus File Manager ................................................................................88
Changing GNOME Preferences ...................................................................................91
Managing Removable Media .......................................................................................92
Trying Other GNOME Applications ...........................................................................93
Exiting GNOME ..........................................................................................................95
Running 3D Accelerated Desktop Effects .......................................................................96
Switching Desktop Environments ....................................................................................98
Using the KDE Desktop .....................................................................................................98
Starting with KDE .......................................................................................................99
KDE Desktop Basics ..................................................................................................100
Managing Files with the Konqueror File Manager ...................................................102
Using the Konqueror Browser Features ....................................................................107
Configuring Konqueror Options ...............................................................................107
Managing Windows ...................................................................................................110
Configuring the Desktop ...........................................................................................111
Adding Widgets .........................................................................................................113
Using the Xfce Desktop Environment ...........................................................................113
Troubleshooting Your Desktop ......................................................................................114
GUI Doesn’t Work at Startup ...................................................................................115
Tuning Your Video Card and Monitor .....................................................................116
Configuring Video Cards for Gaming .......................................................................118
Getting More Information .........................................................................................118
Summary ............................................................................................................................118
Chapter 4: Using Linux Commands . . . . . . . . . . . . . . . . . . . . 119
The Shell Interface ...........................................................................................................119
Checking Your Login Session ...................................................................................120
Checking Directories and Permissions .....................................................................121

xii

Contents

Checking System Activity .........................................................................................123
Exiting the Shell ........................................................................................................125
Understanding the Shell ..................................................................................................125
Using the Shell in Linux .................................................................................................126
Locating Commands .................................................................................................127
Rerunning Commands ..............................................................................................129
Connecting and Expanding Commands ...................................................................135
Using Shell Environment Variables ..........................................................................138
Managing Background and Foreground Processes ...................................................141
Configuring Your Shell .............................................................................................143
Working with the Linux File System ............................................................................147
Creating Files and Directories ...................................................................................149
Moving, Copying, and Deleting Files .......................................................................155
Using the vi Text Editor ..................................................................................................155
Starting with Vi .........................................................................................................156
Moving around the File ............................................................................................159
Searching for Text .....................................................................................................159
Using Numbers with Commands .............................................................................160
Summary ............................................................................................................................161
Part II Using CentOS
Chapter 5: Accessing and Running Applications . . . . . . . . . . . . . 165
Getting and Installing Software Packages ...................................................................166
Downloading and Installing Applications with yum ...............................................167
Getting CentOS Software Updates ............................................................................175
Managing RPM Packages ................................................................................................176
Using the Add/Remove Window ..............................................................................176
Using the rpm Command .........................................................................................178
Using Software in Different Formats ............................................................................188
Understanding Software Package Names and Formats ............................................189
Understanding Different Archive Formats ................................................................191
Building and Installing from Source Code ...............................................................191
Using CentOS to Run Applications ...............................................................................195
Finding Common Desktop Applications in Linux ...................................................196
Investigating Your Desktop .......................................................................................196
Starting Applications from a Menu ...........................................................................198
Starting Applications from a Run Application Window ..........................................198
Starting Applications from a Terminal Window ......................................................199
Running Remote X Applications ...............................................................................201
Running Microsoft Windows, DOS, and Macintosh Applications ..........................205
Running DOS Applications .......................................................................................207
Running Microsoft Windows Applications in Linux ...............................................209

xiii

Contents

Running Applications in Virtual Environments ..........................................................214
Running Applications Virtually with Xen .................................................................214
Running Applications Virtually with KVM and QEMU ...........................................218
Summary ............................................................................................................................220
Chapter 6: Publishing with CentOS . . . . . . . . . . . . . . . . . . . . 221
Desktop Publishing in Linux ..........................................................................................222
Using Text Editors and Notepads .............................................................................222
Using Word Processors .............................................................................................222
Using Traditional Linux Publishing Tools ...................................................................226
Creating Documents in Groff or LaTeX ...................................................................227
Text Processing with Groff ........................................................................................228
Text Processing with TeX/LaTeX ..............................................................................231
Converting Documents .............................................................................................233
Creating DocBook Documents ..................................................................................234
Understanding SGML and XML ...............................................................................235
Displaying PDF Files with Evince .................................................................................238
Doing Page Layout with Scribus ...................................................................................239
Working with Graphics ...................................................................................................241
Manipulating Images with GIMP ..............................................................................241
Taking Screen Captures ............................................................................................243
Creating Vector Graphic Images with Inkscape .......................................................244
Using Scanners Driven by SANE ...................................................................................246
Web Publishing .................................................................................................................247
Summary ............................................................................................................................248
Chapter 7: Music, Video, and Images in Linux . . . . . . . . . . . . . . 249
Understanding Multimedia and Legal Issues in Linux ..............................................250
Extending Freedom to Codecs .......................................................................................251
Listening to Music in Linux ...........................................................................................251
Configuring a Sound Card ........................................................................................253
Choosing Audio Players ............................................................................................259
Automatically Playing CDs ........................................................................................260
Playing and Managing Music with Rhythmbox .......................................................261
Playing Music with XMMS Audio Player .................................................................264
Using ogg123, mpg321, and play Command-Line Players .....................................267
Using MIDI Audio Players ........................................................................................268
Converting Audio Files with SoX .............................................................................268
Extracting and Encoding Music ................................................................................271
Creating Your Own Music CDs ................................................................................274
Creating CD Labels with cdlabelgen ........................................................................277
Viewing TV and Webcams ..............................................................................................278
Watching TV with Tvtime ........................................................................................279
Videoconferencing and VOIP with Ekiga .................................................................281

xiv

Contents

Playing Video ....................................................................................................................285
Examining Laws Affecting Video and Linux ............................................................285
Understanding Video Content Types .......................................................................286
Watching Video with Xine ........................................................................................288
Using Totem Movie Player ........................................................................................292
Using a Digital Camera ...................................................................................................293
Displaying Images in gThumb ..................................................................................293
Using Your Camera as a Storage Device ..................................................................295
Summary ............................................................................................................................296
Chapter 8: Using the Internet and the Web . . . . . . . . . . . . . . . . 297
Overview of Internet Applications and Commands ...................................................297
Browsing the Web ............................................................................................................300
Understanding Web Browsing ..................................................................................301
Browsing the Web with Firefox ................................................................................305
Setting Up Firefox .....................................................................................................308
Using Text-Based Web Browsers ..............................................................................316
Communicating with E-Mail ..........................................................................................317
E-Mail Basics .............................................................................................................319
Using Evolution E-Mail .............................................................................................320
Thunderbird Mail Client ...........................................................................................322
Text-Based Mail Programs .........................................................................................324
Participating in Newsgroups ..........................................................................................326
Instant Messaging with Pidgin .......................................................................................326
Sharing Files with BitTorrent ........................................................................................328
Using Remote Login, Copy, and Execution .................................................................329
Using Telnet for Remote Login .................................................................................330
Copying Files with FTP ............................................................................................331
Getting Files with Wget ............................................................................................337
Using ssh for Remote Login/Remote Execution .......................................................339
Using scp for Remote File Copy ...............................................................................340
Using the ‘‘r’’ Commands: rlogin, rcp, and rsh ........................................................341
Summary ............................................................................................................................341
Part III Adminstration
Chapter 9: Understanding System Administration . . . . . . . . . . . . 345
Using the root User Account ..........................................................................................346
Becoming Super User (the su Command) ....................................................................346
Learning about Administrative GUI Tools, Commands, Configuration
Files, and Log Files .....................................................................................................348
Using Graphical Administration Tools .....................................................................348
Administrative Commands ........................................................................................353
Administrative Configuration Files ...........................................................................354

xv

Contents

Administrative Log Files ...........................................................................................358
Using Other Administrative Logins ..........................................................................358
Administering Your Linux System .................................................................................360
Configuring Hardware .....................................................................................................361
Checking Your Hardware ..........................................................................................361
Managing Hardware with HAL .................................................................................361
Reconfiguring Hardware with kudzu .......................................................................362
Configuring Modules .................................................................................................364
Managing File Systems and Disk Space .......................................................................366
Mounting File Systems ..............................................................................................369
Using the mkfs Command to Create a File System .................................................377
Adding a Hard Disk ..................................................................................................378
Using RAID Disks ......................................................................................................381
Checking System Space .............................................................................................382
Monitoring System Performance ...................................................................................385
Watch Computer Usage with System Monitor .........................................................385
Monitoring CPU Usage with top ..............................................................................386
Monitoring Power Usage on Laptop Computers ......................................................387
Using Security Enhanced Linux .....................................................................................388
Understanding Security Enhanced Linux .....................................................................389
Types and Roles in SELinux .....................................................................................389
Users in SELinux .......................................................................................................390
Policies in SELinux ....................................................................................................390
Tools in SELinux .......................................................................................................390
Using SELinux in CentOS ...............................................................................................391
SELinux .....................................................................................................................391
Checking Whether SELinux Is On ...........................................................................392
Checking SELinux Status ..........................................................................................393
Summary ............................................................................................................................394
Chapter 10: Setting up and Maintaining User Accounts . . . . . . . . . . 395
Creating User Accounts ...................................................................................................395
Adding Users with useradd .......................................................................................396
Adding Users with User Manager .............................................................................400
Setting User Defaults .......................................................................................................402
Supplying Initial Login Scripts .................................................................................405
Supplying Initial .bashrc and .bash_profile Files .....................................................406
Supplying an Initial .tcshrc File ................................................................................407
Configuring System-Wide Shell Options ..................................................................407
Setting System Profiles ..............................................................................................408
Adding User Accounts to Servers .............................................................................409
Creating Portable Desktops ............................................................................................410
Providing Support to Users ............................................................................................411

xvi

Contents

Creating a Technical Support Mailbox .....................................................................412
Resetting a User’s Password ......................................................................................412
Modifying Accounts .........................................................................................................413
Modifying User Accounts with usermod ..................................................................413
Modifying User Accounts with User Manager ..........................................................415
Deleting User Accounts ...................................................................................................416
Deleting User Accounts with userdel .......................................................................417
Deleting User Accounts with User Manager .............................................................418
Checking Disk Quotas .....................................................................................................418
Using Quota to Check Disk Usage ...........................................................................418
Using du to Check Disk Use ....................................................................................423
Removing Temp Files Automatically ........................................................................423
Sending Mail to All Users ...............................................................................................424
Summary ............................................................................................................................425
Chapter 11: Automating System Tasks . . . . . . . . . . . . . . . . . . 427
Understanding Shell Scripts ...........................................................................................427
Executing and Debugging Shell Scripts ....................................................................428
Understanding Shell Variables ..................................................................................429
Performing Arithmetic in Shell Scripts .....................................................................431
Using Programming Constructs in Shell Scripts ......................................................432
Some Useful External Programs ................................................................................438
Trying Some Simple Shell Scripts .............................................................................439
System Initialization ........................................................................................................441
Starting init ................................................................................................................442
The inittab File ..........................................................................................................442
System Startup and Shutdown ......................................................................................446
Starting Run-Level Scripts .........................................................................................447
Understanding Run-Level Scripts .............................................................................447
Understanding What Start-Up Scripts Do ................................................................450
Changing Run-Level Script Behavior ........................................................................452
Reorganizing or Removing Run-Level Scripts ..........................................................453
Adding Run-Level Scripts .........................................................................................455
Managing xinetd Services ..........................................................................................456
Manipulating Run Levels ..........................................................................................457
Scheduling System Tasks ................................................................................................458
Using at.allow and at.deny .......................................................................................458
Specifying When Jobs Are Run ................................................................................458
Submitting Scheduled Jobs .......................................................................................459
Viewing Scheduled Jobs ............................................................................................460
Deleting Scheduled Jobs ...........................................................................................460
Using the batch Command .......................................................................................461
Using the cron Facility ..............................................................................................461
Summary ............................................................................................................................465

xvii

Contents

Chapter 12: Creating Backups and Restoring Data . . . . . . . . . . . . 467
Making a Simple Backup Archive .................................................................................467
Doing a Simple Backup with rsync ...............................................................................469
Backing Up Files Locally ...........................................................................................469
Backing Up Files Remotely .......................................................................................470
Choosing Backup Tools ..................................................................................................472
Selecting a Backup Strategy ...........................................................................................472
Full Backup ...............................................................................................................473
Incremental Backup ...................................................................................................473
Disk Mirroring ...........................................................................................................473
Network Backup ........................................................................................................474
Selecting a Backup Medium ...........................................................................................474
Magnetic Tape ...........................................................................................................474
Writable CD Drives ...................................................................................................476
Writable DVD Drives ................................................................................................480
Writing CDs or DVDs with growisofs ......................................................................481
Backing Up to a Hard Drive ...........................................................................................482
Backing Up Files with dump ..........................................................................................483
Creating a Backup with dump ..................................................................................484
Understanding Dump Levels ....................................................................................486
Automating Backups with cron .....................................................................................487
Restoring Backed-Up Files ..............................................................................................488
Restoring an Entire File System ................................................................................490
Recovering Individual Files .......................................................................................491
Configuring Amanda for Network Backups ................................................................493
Creating Amanda Directories ....................................................................................494
Creating the amanda.conf file ...................................................................................495
Creating a disklist File ..............................................................................................497
Adding Amanda Network Services ...........................................................................498
Performing an Amanda Backup ................................................................................499
Using the pax Archiving Tool ........................................................................................499
Summary ............................................................................................................................503
Chapter 13: Security . . . . . . . . . . . . . . . . . . . . . . . . . . . 505
Linux Security Checklist .................................................................................................505
Using Password Protection .............................................................................................508
Choosing Good Passwords ........................................................................................508
Using a Shadow Password File .................................................................................509
Securing Linux with iptables Firewalls ........................................................................511
Using the Security Level Configuration Window .....................................................512
Configuring an iptables Firewall ...............................................................................513
Controlling Access to Services with TCP Wrappers ..................................................525
Checking Log Files ...........................................................................................................528

xviii

Contents

Replacing the sysklogd Package ................................................................................528
Understanding the rsyslogd Service ..........................................................................528
Tracking Log Messages with logwatch .....................................................................531
Using the Secure Shell Package .....................................................................................532
Starting the SSH Service ...........................................................................................533
Using the ssh, sftp, and scp commands ...................................................................533
Using SSH, SCP, and SFTP without Passwords .......................................................535
Securing Linux Servers ....................................................................................................536
Understanding Attack Techniques ............................................................................536
Protecting against Denial-of-Service Attacks ............................................................537
Protecting against Distributed DOS Attacks .............................................................540
Protecting against Intrusion Attacks .........................................................................544
Securing Servers with SELinux .................................................................................548
Protecting Web Servers with Certificates and Encryption .......................................548
Summary ............................................................................................................................558
Part IV Networking
Chapter 14: Setting Up Network Connections and LANs . . . . . . . . . 561
Connecting to the Network with NetworkManager ...................................................561
Connecting to a Wireless Network ...........................................................................563
Connecting to a Wired Network ..............................................................................563
Setting Up a Virtual Private Network Connection ...................................................564
Understanding Local Area Networks ............................................................................565
Planning, Getting, and Setting Up LAN Hardware ..................................................566
Configuring TCP/IP for Your LAN ...........................................................................571
Setting Up a Wireless LAN .............................................................................................575
Understanding Wireless Networks ...........................................................................576
Choosing Wireless Hardware ....................................................................................577
Getting Wireless Drivers ...........................................................................................582
Installing Wireless Linux Software ...........................................................................584
Configuring the Wireless LAN ..................................................................................584
Testing Distances .......................................................................................................590
Setting Wireless Extensions ......................................................................................590
Understanding Internet Protocol Addresses ................................................................591
IP Address Classes .....................................................................................................593
Understanding Netmasks ..........................................................................................593
Classless Inter-Domain Routing ................................................................................594
Getting IP Addresses .................................................................................................596
Troubleshooting Your LAN .............................................................................................597
Did Linux Find Your Ethernet Driver at Boot Time? ..............................................597
Can You Reach Another Computer on the LAN? ....................................................597
Is Your Ethernet Connection Up? .............................................................................598

xix

Contents

Troubleshooting a Wireless LAN ..............................................................................600
Watching LAN Traffic with Wireshark .....................................................................604
Summary ............................................................................................................................609
Chapter 15: Setting Up an Internet Connection . . . . . . . . . . . . . . 611
Understanding How the Internet Is Structured ..........................................................611
Internet Domains .......................................................................................................613
Hostnames and IP Addresses ....................................................................................615
Routing ......................................................................................................................616
Proxies .......................................................................................................................617
Using Dial-Up Connections to the Internet .................................................................617
Getting Information ...................................................................................................617
Setting Up Dial-Up PPP ............................................................................................618
Creating a Dial-Up Connection with the Network Configuration Window ...........619
Launching Your PPP Connection .............................................................................621
Launching Your PPP Connection on Demand .........................................................621
Checking Your PPP Connection ...............................................................................622
Connecting Your LAN to the Internet ...........................................................................629
Setting Up Linux as a Router .........................................................................................630
Configuring the Linux Router ...................................................................................630
Configuring Network Clients ....................................................................................633
Configuring a Virtual Private Network Connection ...................................................634
Understanding IPsec ..................................................................................................635
Using IPsec Protocols ................................................................................................635
Using IPsec in CentOS ..............................................................................................636
Configuring an OpenVPN Server .............................................................................637
Setting Up Linux as a Proxy Server ..............................................................................643
Starting the Squid Daemon .......................................................................................644
Using a Simple squid.conf File .................................................................................645
Modifying the Squid Configuration File ...................................................................648
Debugging Squid .......................................................................................................651
Setting Up Proxy Clients .................................................................................................653
Configuring Firefox to Use a Proxy ..........................................................................654
Configuring Other Browsers to Use a Proxy ............................................................655
Summary ............................................................................................................................655
Chapter 16: Setting Up Printers and Printing . . . . . . . . . . . . . . . 657
Common UNIX Printing Service ....................................................................................658
Setting Up Printers ..........................................................................................................658
Using the Printer Configuration Window ................................................................659
Using Web-Based CUPS Administration ..................................................................667
Configuring the CUPS Server (cupsd.conf) ..............................................................670
Configuring CUPS Printer Options ..........................................................................672
Using Printing Commands ..............................................................................................673
Using lpr to Print ......................................................................................................673

xx

Contents

Listing Status with lpc ...............................................................................................674
Removing Print Jobs with lprm ................................................................................674
Configuring Print Servers ...............................................................................................675
Configuring a Shared CUPS Printer .........................................................................675
Configuring a Shared Samba Printer ........................................................................676
Summary ............................................................................................................................677
Chapter 17: Setting Up a File Server . . . . . . . . . . . . . . . . . . . 679
Goals of Setting Up a File Server ..................................................................................679
Setting Up an NFS File Server .......................................................................................680
Sharing NFS File Systems .........................................................................................682
Using NFS File Systems ............................................................................................689
Unmounting NFS File Systems .................................................................................694
Other Cool Things to Do with NFS .........................................................................695
Setting Up a Samba File Server .....................................................................................696
Getting and Installing Samba ....................................................................................697
Configuring a Simple Samba Server .........................................................................698
Configuring Samba with SWAT ...............................................................................701
Working with Samba Files and Commands .............................................................710
Setting Up Samba Clients .........................................................................................714
Troubleshooting Your Samba Server ........................................................................715
Summary ............................................................................................................................718
Chapter 18: Setting Up a Mail Server . . . . . . . . . . . . . . . . . . . 719
Introducing SMTP and Sendmail ..................................................................................719
Installing and Running Sendmail ..................................................................................720
Starting Sendmail ......................................................................................................721
Other Programs .........................................................................................................722
Logging Performed by Sendmail ...............................................................................722
Configuring Sendmail ......................................................................................................724
Getting a Domain Name ...........................................................................................725
Configuring Basic Sendmail Settings (sendmail.mc) ................................................725
Defining Outgoing Mail Access .................................................................................729
Configuring Virtual Servers .......................................................................................731
Configuring Virtual Users .........................................................................................732
Adding User Accounts ..............................................................................................733
Starting Sendmail and Generating Database Files ....................................................733
Re-Directing Mail ......................................................................................................734
Introducing Postfix ..........................................................................................................737
Stopping Spam with SpamAssassin ..............................................................................738
Using SpamAssassin ..................................................................................................738
Setting Up SpamAssassin on Your Mail Server ........................................................739
Setting E-Mail Readers to Filter Spam ......................................................................741
Getting Mail from the Server (POP3 or IMAPv4) .......................................................741
Accessing Mailboxes in Linux ...................................................................................742

xxi

Contents

Configuring IMAPv4 and POP3 with Dovecot .........................................................743
Getting Mail from Your Browser with SquirrelMail ..................................................744
Administering a Mailing List with Mailman ...............................................................746
Summary ............................................................................................................................749
Chapter 19: Setting Up an FTP Server . . . . . . . . . . . . . . . . . . 751
Understanding FTP Servers ............................................................................................752
Attributes of FTP Servers ..........................................................................................752
FTP User Types .........................................................................................................753
Using the Very Secure FTP Server .................................................................................753
Quick-Starting vsFTPd ..............................................................................................754
Configuring vsFTPd ..................................................................................................755
Getting More Information about FTP Servers .............................................................761
Summary ............................................................................................................................761
Chapter 20: Setting Up a Web Server . . . . . . . . . . . . . . . . . . . 763
Introduction to Web Servers ..........................................................................................764
The Apache Web Server ...........................................................................................764
Other Web Servers Available for CentOS ................................................................765
Quick-Starting the Apache Web Server ........................................................................766
Configuring the Apache Server ......................................................................................768
Configuring the Web Server (httpd.conf) ................................................................769
Configuring Modules and Related Services (/etc/httpd/conf.d/*.conf) ....................804
Starting and Stopping the Server ..................................................................................806
Monitoring Server Activities ...........................................................................................807
Displaying Server Information ..................................................................................808
Displaying Server Status ............................................................................................808
Further Security of Server-Info and Server-Status ...................................................810
Logging Errors ...........................................................................................................811
Logging Hits ..............................................................................................................811
Analyzing Web-Server Traffic ...................................................................................812
Summary ............................................................................................................................814
Chapter 21: Setting Up an LDAP Address Book Server . . . . . . . . . . 815
Understanding LDAP .......................................................................................................816
Defining Information in Schemas .............................................................................817
Structuring Your LDAP Directories ..........................................................................819
Setting Up the OpenLDAP Server ..................................................................................819
Installing OpenLDAP Packages .................................................................................819
Configuring the OpenLDAP Server (slapd.conf) ......................................................819
Starting the OpenLDAP Service ................................................................................822
Setting Up the Address Book .........................................................................................822
More Ways to Configure LDAP .....................................................................................828
Accessing an LDAP Address Book from Thunderbird ...............................................829
Summary ............................................................................................................................831

xxii

Contents

Chapter 22: Setting Up a DHCP Boot Server . . . . . . . . . . . . . . . 833
Using the Dynamic Host Configuration Protocol .......................................................834
Setting Up a DHCP Server ..............................................................................................834
Opening Your Firewall and SELinux for DHCP ......................................................835
Configuring the /etc/dhcpd.conf File ........................................................................836
Starting the DHCP Server .........................................................................................842
Setting Up a DHCP Client ..............................................................................................843
Summary ............................................................................................................................844
Chapter 23: Setting Up a MySQL Database Server . . . . . . . . . . . . 845
Finding MySQL Packages ...............................................................................................846
Configuring the MySQL Server ......................................................................................848
Using MySQL User/Group Accounts ........................................................................848
Adding Administrative Users ....................................................................................848
Setting MySQL Options ............................................................................................849
Using Sample my.cnf Files ........................................................................................854
Starting the MySQL Server .............................................................................................855
Checking That MySQL Server Is Working ...................................................................856
Working with MySQL Databases ..................................................................................857
Starting the mysql Command ...................................................................................857
Creating a Database with MySQL .............................................................................858
Adding Data to a MySQL Database Table ................................................................860
Understanding MySQL Tables .......................................................................................863
Displaying MySQL Databases ........................................................................................868
Displaying All or Selected Records ...........................................................................868
Displaying Selected Columns ....................................................................................869
Sorting Data ...............................................................................................................870
Making Changes to Tables and Records ......................................................................871
Altering the Structure of MySQL Tables ..................................................................871
Updating and Deleting MySQL Records ...................................................................872
Adding and Removing User Access ...............................................................................873
Adding Users and Granting Access ..........................................................................873
Revoking Access ........................................................................................................874
Backing Up Databases ....................................................................................................875
Checking and Fixing Databases ....................................................................................875
Summary ............................................................................................................................877
Chapter 24: Making Servers Public with DNS . . . . . . . . . . . . . . 879
Determining Goals for Your Server ...............................................................................880
Using a Hosting Service ............................................................................................880
Connecting a Public Server ............................................................................................881
Choosing an ISP ........................................................................................................881
Getting a Domain Name ...........................................................................................884
Configuring Your Public Server .....................................................................................886
Configuring Networking ...........................................................................................886

xxiii

Contents

Configuring Servers ...................................................................................................887
Managing Security .....................................................................................................888
Setting Up a Domain Name System Server .................................................................890
Understanding DNS ..................................................................................................890
DNS Name Server Example ......................................................................................894
Quick-Starting a DNS Server ....................................................................................895
Checking That DNS Is Working ...............................................................................903
Getting More Information about BIND ........................................................................905
Summary ............................................................................................................................905




Get It Here