Introduction xxx
Part I Performing Basic System Management Tasks
Chapter 1 Installing Red Hat Enterprise Linux 3
Do I Know This Already? Quiz 3
Foundation Topics 6
Preparing to Install Red Hat Enterprise Linux 6
What Is Red Hat Enterprise Linux 9 Server? 6
Getting the Software 7
Using Red Hat Enterprise Linux 7
Using CentOS Stream 7
Other Distributions 8
Understanding Access to Repositories 8
Setup Requirements 9
Cert Guide Environment Description 9
Performing an Installation 10
Summary 22
Exam Preparation Tasks 23
End-of-Chapter Lab 24
Chapter 2 Using Essential Tools 27
Do I Know This Already? Quiz 27
Foundation Topics 30
Basic Shell Skills 30
Understanding Commands 30
Executing Commands 30
I/O Redirection 32
Using Pipes 34
History 35
Bash Completion 37
Editing Files with vim 37
Understanding the Shell Environment 40
Understanding Variables 40
Recognizing Environment Configuration Files 41
Using /etc/motd and /etc/issue 42
Finding Help 43
Using --help 43
Using man 43
Finding the Right man Page 44
Updating mandb 46
Using info 47
Using /usr/share/doc Documentation Files 48
Summary 49
Exam Preparation Tasks 49
End-of-Chapter Lab 51
Chapter 3 Essential File Management Tools 53
Do I Know This Already? Quiz 53
Foundation Topics 56
Working with the File System Hierarchy 56
Defining the File System Hierarchy 56
Understanding Mounts 57
Managing Files 61
Working with Wildcards 61
Managing and Working with Directories 61
Working with Absolute and Relative Pathnames 62
Listing Files and Directories 64
Copying Files and Directories 64
Moving Files and Directories 65
Deleting Files and Directories 66
Using Links 68
Understanding Hard Links 68
Understanding Symbolic Links 69
Creating Links 69
Removing Links 70
Working with Archives and Compressed Files 71
Managing Archives with tar 72
Creating Archives with tar 72
Monitoring and Extracting tar Files 73
Using Compression 74
Summary 75
Exam Preparation Tasks 76
End-of-Chapter Lab 77
Chapter 4 Working with Text Files 81
Do I Know This Already? Quiz 81
Foundation Topics 84
Using Common Text FileRelated Tools 84
Doing More with less 84
Showing File Contents with cat 85
Displaying the First or Last Lines of a File with head and tail 86
Filtering Specific Columns with cut 87
Sorting File Contents and Output with sort 87
Counting Lines, Words, and Characters with wc 88
A Primer to Using Regular Expressions 89
Using Line Anchors 90
Using Escaping in Regular Expressions 91
Using Wildcards and Multipliers 91
Using Extended Regular Expressions 91
Using grep to Analyze Text 93
Working with Other Useful Text Processing Utilities 94
Summary 96
Exam Preparation Tasks 96
End-of-Chapter Lab 98
Chapter 5 Connecting to Red Hat Enterprise Linux 9 101
Do I Know This Already? Quiz 101
Foundation Topics 104
Working on Local Consoles 104
Logging In to a Local Console 104
Switching Between Terminals in a Graphical Environment 105
Working with Multiple Terminals in a Nongraphical Environment 107
Understanding Pseudo Terminal Devices 108
Booting, Rebooting, and Shutting Down Systems 109
Using SSH and Related Utilities 110
Accessing Remote Systems Using SSH 110
Using Graphical Applications in an SSH Environment 113
Securely Transferring Files Between Systems 114
Using scp to Securely Copy Files 114
Using sftp to Securely Transfer Files 115
Using rsync to Synchronize Files 115
Configuring Key-Based Authentication for SSH 116
Using Passphrases or Not? 116
Summary 117
Exam Preparation Tasks 118
End-of-Chapter Labs 119
Chapter 6 User and Group Management 121
Do I Know This Already? Quiz 121
Foundation Topics 124
Understanding Different User Types 124
Users on Linux 124
Working as Root 124
Using su 125
sudo 126
PolicyKit 127
Creating and Managing User Accounts 129
System Accounts and Normal Accounts 129
Creating Users 132
Modifying the Configuration Files 132
Using useradd 133
Home Directories 133
Default Shell 133
Managing User Properties 134
Configuration Files for User Management Defaults 134
Managing Password Properties 135
Creating a User Environment 135
Creating and Managing Group Accounts 137
Understanding Linux Groups 137
Creating Groups 137
Creating Groups with vigr 137
Using groupadd to Create Groups 138
Managing Group Properties 138
Summary 139
Exam Preparation Tasks 140
End-of-Chapter Labs 141
Chapter 7 Permissions Management 145
Do I Know This Already? Quiz 145
Foundation Topics 148
Managing File Ownership 148
Displaying Ownership 148
Changing User Ownership 149
Changing Group Ownership 150
Understanding Default Ownership 150
Managing Basic Permissions 151
Understanding Read, Write, and Execute Permissions 152
Applying Read, Write, and Execute Permissions 153
Managing Advanced Permissions 155
Understanding Advanced Permissions 155
Applying Advanced Permissions 157
Setting Default Permissions with umask 159
Working with User-Extended Attributes 160
Summary 162
Exam Preparation Tasks 162
End-of-Chapter Lab 164
Chapter 8 Configuring Networking 167
Do I Know This Already? Quiz 167
Foundation Topics 170
Networking Fundamentals 170
IP Addresses 170
IPv6 Addresses 171
IPv4 Network Masks 171
Binary Notation 172
MAC Addresses 173
Protocol and Ports 173
Managing Network Addresses and Interfaces 174
Validating Network Configuration 175
Validating Network Address Configuration 175
Validating Routing 178
Validating the Availability of Ports and Services 179
Managing Network Configuration with nmtui and nmcli 180
Required Permissions to Change Network Configuration 181
Configuring the Network with nmcli 182
Configuring the Network with nmtui 184
Working on Network Configuration Files 186
Setting Up Hostname and Name Resolution 187
Hostnames 187
DNS Name Resolution 189
Summary 191
Exam Preparation Tasks 191
End-of-Chapter Lab 193
Part II Operating Running Systems
Chapter 9 Managing Software 195
Do I Know This Already? Quiz 195
Foundation Topics 198
Managing Software Packages with dnf 198
Understanding the Role of Repositories 198
Registering Red Hat Enterprise Linux for Support 199
Managing Subscriptions 200
Specifying Which Repository to Use 200
Understanding Repository Security 203
Creating Your Own Repository 204
Using dnf 206
Using dnf to Find Software Packages 206
Getting More Information About Packages 208
Installing and Removing Software Packages 209
Showing Lists of Packages 211
Updating Packages 213
Working with dnf Package Groups 214
Using dnf History 216
Managing Package Modules 217
Understanding dnf Modules 218
Managing Modules 218
Managing Software Packages with rpm 221
Understanding RPM Filenames 222
Querying the RPM Database 222
Querying RPM Package Files 223
Using repoquery 224
Summary 226
Exam Preparation Tasks 226
End-of-Chapter Labs 227
Chapter 10 Managing Processes 231
Do I Know This Already? Quiz 231
Foundation Topics 234
Introduction to Process Management 234
Managing Shell Jobs 234
Running Jobs in the Foreground and Background 234
Managing Shell Jobs 235
Understanding ParentChild Relations 237
Using Common Command-Line Tools for Process Management 237
Understanding Processes and Threads 238
Using ps to Get Process Information 239
Understanding Process Priorities 241
Exploring Relations Between Slices 241
Managing Process Priorities 242
Sending Signals to Processes with kill, killall, and pkill 243
Killing Zombies 245
Using top to Manage Processes 246
Using tuned to Optimize Performance 248
Summary 250
Exam Preparation Tasks 250
End-of-Chapter Lab 251
Chapter 11 Working with Systemd 253
Do I Know This Already? Quiz 253
Foundation Topics 256
Understanding Systemd 256
Understanding Systemd Unit Locations 256
Understanding Systemd Service Units 257
Understanding Systemd Mount Units 258
Understanding Systemd Socket Units 259
Understanding Systemd Target Units 260
Managing Units Through Systemd 261
Managing Dependencies 263
Managing Unit Options 265
Summary 267
Exam Preparation Tasks 267
End-of-Chapter Lab 268
Chapter 12 Scheduling Tasks 271
Do I Know This Already? Quiz 271
Foundation Topics 274
Understanding Task Scheduling Options in RHEL 274
Using Systemd Timers 274
Configuring cron to Automate Recurring Tasks 276
Managing the crond Service 276
Understanding cron Timing 278
Managing cron Configuration Files 278
Understanding the Purpose of anacron 281
Managing cron Security 282
Configuring at to Schedule Future Tasks 282
Summary 283
Exam Preparation Tasks 284
End-of-Chapter Lab 285
Chapter 13 Configuring Logging 287
Do I Know This Already? Quiz 287
Foundation Topics 290
Understanding System Logging 290
Understanding the Role of systemd-journald and rsyslogd 290
Reading Log Files 292
Understanding Log File Contents 293
Live Log File Monitoring 294
Using logger 294
Working with...