Description

Book Synopsis


Table of Contents

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 File–Related 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 Parent–Child 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 systemd-journald 295
Using journalctl to Find Events 295
Preserving the Systemd Journal 298
Configuring rsyslogd 300
Understanding rsyslogd Configuration Files 300
Understanding rsyslog.conf Sections 300
Understanding Facilities, Priorities, and Log Destinations 301
Rotating Log Files 304
Summary 306
Exam Preparation Tasks 306
End-of-Chapter Lab 308
Chapter 14 Managing Storage 311
“Do I Know This Already?” Quiz 311
Foundation Topics 314
Understanding MBR and GPT Partitions 314
Understanding the MBR Partitioning Scheme 314
Understanding the Need for GPT Partitioning 315
Understanding Storage Measurement Units 316
Managing Partitions and File Systems 317
Creating MBR Partitions with fdisk 318
Using Extended and Logical Partitions on MBR 320
Creating GPT Partitions with gdisk 322
Creating GPT Partitions with parted 327
Creating File Systems 328
Changing File System Properties 329
Managing Ext4 File System Properties 329
Managing XFS File System Properties 331
Adding Swap Partitions 332
Adding Swap Files 333
Mounting File Systems 333
Manually Mounting File Systems 334
Using Device Names, UUIDs, or Disk Labels 334
Automating File System Mounts Through /etc/fstab 335
Using Systemd Mounts 338
Summary 339
Exam Preparation Tasks 340
End-of-Chapter Lab 341
Chapter 15 Managing Advanced Storage 343
“Do I Know This Already?” Quiz 343
Foundation Topics 346
Understanding LVM 346
LVM Architecture 346
LVM Features 347
Creating LVM Logical Volumes 348
Creating the Physical Volumes 350
Creating the Volume Groups 353
Creating the Logical Volumes and File Systems 355
Understanding LVM Device Naming 355
Resizing LVM Logical Volumes 358
Resizing Volume Groups 358
Resizing Logical Volumes and File Systems 358
Reducing Volume Groups 360
Configuring Stratis 361
Understanding Stratis Architecture 362
Creating Stratis Storage 362
Managing Stratis 363
Summary 365
Exam Preparation Tasks 365
End-of-Chapter Labs 366
Part III Performing Advanced System Administration Tasks
Chapter 16 Basic Kernel Management 369
“Do I Know This Already?” Quiz 369
Foundation Topics 372
Understanding the Role of the Linux Kernel 372
Understanding the Use of Kernel Threads and Drivers 372
Analyzing What the Kernel Is Doing 373
Working with Kernel Modules 375
Understanding Hardware Initialization 376
Managing Kernel Modules 378
Checking Driver Availability for Hardware Devices 381
Managing Kernel Module Parameters 382
Upgrading the Linux Kernel 383
Summary 383
Exam Preparation Tasks 384
End-of-Chapter Lab 385
Chapter 17 Managing and Understanding the Boot Procedure 387
“Do I Know This Already?” Quiz 387
Foundation Topics 390
Managing Systemd Targets 390
Understanding Systemd Targets 390
Working with Targets 390
Understanding Target Units 391
Understanding Wants 392
Managing Systemd Targets 392
Isolating Targets 393
Setting the Default Target 396
Working with GRUB 2 396
Understanding GRUB 2 396
Understanding GRUB 2 Configuration Files 397
Modifying Default GRUB 2 Boot Options 398
Summary 399
Exam Preparation Tasks 399
End-of-Chapter Labs 401
Chapter 18 Essential Troubleshooting Skills 403
“Do I Know This Already?” Quiz 403
Foundation Topics 406
Understanding the RHEL 9 Boot Procedure 406
Passing Kernel Boot Arguments 408
Accessing the Boot Prompt 408
Starting a Troubleshooting Target 409
Using a Rescue Disk 410
Restoring System Access Using a Rescue Disk 411
Reinstalling GRUB Using a Rescue Disk 413
Re-creating the Initramfs Using a Rescue Disk 413
Fixing Common Issues 414
Reinstalling GRUB 2 414
Fixing the Initramfs 415
Recovering from File System Issues 415
Resetting the Root Password 416
Summary 417
Exam Preparation Tasks 417
End-of-Chapter Lab 419
Chapter 19 An Introduction to Automation with Bash Shell Scripting 421
“Do I Know This Already?” Quiz 421
Foundation Topics 424
Understanding Shell Scripting Core Elements 424
Using Variables and Input 426
Using Positional Parameters 426
Working with Variables 427
Using Conditional Loops 429
Working with if … then … else 430
Using || and && 431
Applying for 431
Understanding while and until 432
Understanding case 434
Bash Shell Script Debugging 435
Summary 435
Exam Preparation Tasks 436
End-of-Chapter Lab 437
Part IV Managing Network Services
Chapter 20 Configuring SSH 439
“Do I Know This Already?” Quiz 439
Foundation Topics 442
Hardening the SSH Server 442
Limiting Root Access 442
Configuring Alternative Ports 443
Modifying SELinux to Allow for Port Changes 443
Limiting User Access 444
Using Other Useful sshd Options 445
Session Options 446
Connection Keepalive Options 446
Configuring Key-Based Authentication with Passphrases 447
Summary 448
Exam Preparation Tasks 448
End-of-Chapter Lab 450
Chapter 21 Managing Apache HTTP Services 453
“Do I Know This Already?” Quiz 453
Foundation Topics 456
Configuring a Basic Apache Server 456
Installing the Required Software 456
Identifying the Main Configuration File 456
Creating Web Server Content 459
Understanding Apache Configuration Files 460
Creating Apache Virtual Hosts 462
Summary 464
Exam Preparation Tasks 464
End-of-Chapter Lab 466
Chapter 22 Managing SELinux 469
“Do I Know This Already?” Quiz 470
Foundation Topics 473
Understanding SELinux Working Modes 473
Understanding Context Settings and the Policy 477
Monitoring Current Context Labels 477
Setting Context Types 479
Finding the Context Type You Need 482
Restoring Default File Contexts 483
Managing Port Access 484
Using Boolean Settings to Modify SELinux Settings 485
Diagnosing and Addressing SELinux Policy Violations 487
Making SELinux Analyzing Easier 489
Summary 490
Exam Preparation Tasks 491
End-of-Chapter Lab 492
Chapter 23 Configuring a Firewall 495
“Do I Know This Already?” Quiz 495
Foundation Topics 498
Understanding Linux Firewalling 498
Understanding Previous Solutions 498
Understanding Firewalld 498
Understanding Firewalld Zones 499
Understanding Firewalld Services 500
Working with Firewalld 501
Summary 504
Exam Preparation Tasks 504
End-of-Chapter Lab 506
Chapter 24 Accessing Network Storage 509
“Do I Know This Already?” Quiz 509
Foundation Topics 512
Using NFS Services 512
Understanding NFS Security 512
RHEL NFS Versions 512
Setting Up NFS 513
Mounting the NFS Share 514
Mounting Remote File Systems Through fstab 515
Mounting NFS Shares Through fstab 515
Using Automount to Mount Remote File Systems 516
Understanding Automount 516
Defining Mounts in Automount 516
Configuring Automount for NFS 517
Using Wildcards in Automount 517
Summary 518
Exam Preparation Tasks 518
End-of-Chapter Lab 520
Chapter 25 Configuring Time Services 523
“Do I Know This Already?” Quiz 523
Foundation Topics 526
Understanding Local Time 526
Using Network Time Protocol 527
Managing Time on Red Hat Enterprise Linux 527
Using date 528
Using hwclock 528
Using timedatectl 529
Managing Time Zone Settings 531
Configuring Time Service Clients 533
Summary 534
Exam Preparation Tasks 535
End-of-Chapter Lab 536
Chapter 26 Managing Containers 539
“Do I Know This Already?” Quiz 539
Foundation Topics 542
Understanding Containers 542
Container Host Requirements 543
Containers on RHEL 9 544
Container Orchestration 545
Running a Container 545
Working with Container Images 550
Using Registries 550
Finding Images 552
Inspecting Images 553
Performing Image Housekeeping 556
Building Images from a Containerfile 556
Managing Containers 558
Managing Container Status 558
Running Commands in a Container 559
Managing Container Ports 561
Managing Container Environment Variables 562
Managing Container Storage 563
Running Containers as Systemd Services 566
Summary 568
Exam Preparation Tasks 569
End-of-Chapter Lab 570
Chapter 27 Final Preparation 573
General Tips 573
Verifying Your Readiness 573
Registering for the Exam 573
On Exam Day 574
During the Exam 575
The Nondisclosure Agreement 576
Chapter 28 Theoretical Pre-Assessment Exam 579
Part V RHCSA 9 Practice Exams
RHCSA Practice Exam A 581
RHCSA Practice Exam B 583
Appendix A: Answers to the “Do I Know This Already?” Quizzes and Review Questions 585
Appendix B: Red Hat RHCSA 9 Cert Guide: EX200 Exam Updates 617
Glossary 619

Online Elements:
RHCSA Practice Exam C
RHCSA Practice Exam D
Appendix C: Memory Tables
Appendix D: Memory Tables Answer Key
Appendix E: Study Planner
Glossary


9780138096274 TOC 3/24/2023

Red Hat RHCSA 9 Cert Guide

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    Publisher: Pearson Education (US)
    Publication Date: 01/05/2023
    ISBN13: 9780138096274, 978-0138096274
    ISBN10: 0138096279
    Also in:
    Computing Linux

    Description

    Book Synopsis


    Table of Contents

    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 File–Related 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 Parent–Child 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 systemd-journald 295
    Using journalctl to Find Events 295
    Preserving the Systemd Journal 298
    Configuring rsyslogd 300
    Understanding rsyslogd Configuration Files 300
    Understanding rsyslog.conf Sections 300
    Understanding Facilities, Priorities, and Log Destinations 301
    Rotating Log Files 304
    Summary 306
    Exam Preparation Tasks 306
    End-of-Chapter Lab 308
    Chapter 14 Managing Storage 311
    “Do I Know This Already?” Quiz 311
    Foundation Topics 314
    Understanding MBR and GPT Partitions 314
    Understanding the MBR Partitioning Scheme 314
    Understanding the Need for GPT Partitioning 315
    Understanding Storage Measurement Units 316
    Managing Partitions and File Systems 317
    Creating MBR Partitions with fdisk 318
    Using Extended and Logical Partitions on MBR 320
    Creating GPT Partitions with gdisk 322
    Creating GPT Partitions with parted 327
    Creating File Systems 328
    Changing File System Properties 329
    Managing Ext4 File System Properties 329
    Managing XFS File System Properties 331
    Adding Swap Partitions 332
    Adding Swap Files 333
    Mounting File Systems 333
    Manually Mounting File Systems 334
    Using Device Names, UUIDs, or Disk Labels 334
    Automating File System Mounts Through /etc/fstab 335
    Using Systemd Mounts 338
    Summary 339
    Exam Preparation Tasks 340
    End-of-Chapter Lab 341
    Chapter 15 Managing Advanced Storage 343
    “Do I Know This Already?” Quiz 343
    Foundation Topics 346
    Understanding LVM 346
    LVM Architecture 346
    LVM Features 347
    Creating LVM Logical Volumes 348
    Creating the Physical Volumes 350
    Creating the Volume Groups 353
    Creating the Logical Volumes and File Systems 355
    Understanding LVM Device Naming 355
    Resizing LVM Logical Volumes 358
    Resizing Volume Groups 358
    Resizing Logical Volumes and File Systems 358
    Reducing Volume Groups 360
    Configuring Stratis 361
    Understanding Stratis Architecture 362
    Creating Stratis Storage 362
    Managing Stratis 363
    Summary 365
    Exam Preparation Tasks 365
    End-of-Chapter Labs 366
    Part III Performing Advanced System Administration Tasks
    Chapter 16     Basic Kernel Management 369
    “Do I Know This Already?” Quiz 369
    Foundation Topics 372
    Understanding the Role of the Linux Kernel 372
    Understanding the Use of Kernel Threads and Drivers 372
    Analyzing What the Kernel Is Doing 373
    Working with Kernel Modules 375
    Understanding Hardware Initialization 376
    Managing Kernel Modules 378
    Checking Driver Availability for Hardware Devices 381
    Managing Kernel Module Parameters 382
    Upgrading the Linux Kernel 383
    Summary 383
    Exam Preparation Tasks 384
    End-of-Chapter Lab 385
    Chapter 17 Managing and Understanding the Boot Procedure 387
    “Do I Know This Already?” Quiz 387
    Foundation Topics 390
    Managing Systemd Targets 390
    Understanding Systemd Targets 390
    Working with Targets 390
    Understanding Target Units 391
    Understanding Wants 392
    Managing Systemd Targets 392
    Isolating Targets 393
    Setting the Default Target 396
    Working with GRUB 2 396
    Understanding GRUB 2 396
    Understanding GRUB 2 Configuration Files 397
    Modifying Default GRUB 2 Boot Options 398
    Summary 399
    Exam Preparation Tasks 399
    End-of-Chapter Labs 401
    Chapter 18 Essential Troubleshooting Skills 403
    “Do I Know This Already?” Quiz 403
    Foundation Topics 406
    Understanding the RHEL 9 Boot Procedure 406
    Passing Kernel Boot Arguments 408
    Accessing the Boot Prompt 408
    Starting a Troubleshooting Target 409
    Using a Rescue Disk 410
    Restoring System Access Using a Rescue Disk 411
    Reinstalling GRUB Using a Rescue Disk 413
    Re-creating the Initramfs Using a Rescue Disk 413
    Fixing Common Issues 414
    Reinstalling GRUB 2 414
    Fixing the Initramfs 415
    Recovering from File System Issues 415
    Resetting the Root Password 416
    Summary 417
    Exam Preparation Tasks 417
    End-of-Chapter Lab 419
    Chapter 19 An Introduction to Automation with Bash Shell Scripting 421
    “Do I Know This Already?” Quiz 421
    Foundation Topics 424
    Understanding Shell Scripting Core Elements 424
    Using Variables and Input 426
    Using Positional Parameters 426
    Working with Variables 427
    Using Conditional Loops 429
    Working with if … then … else 430
    Using || and && 431
    Applying for 431
    Understanding while and until 432
    Understanding case 434
    Bash Shell Script Debugging 435
    Summary 435
    Exam Preparation Tasks 436
    End-of-Chapter Lab 437
    Part IV Managing Network Services
    Chapter 20     Configuring SSH 439
    “Do I Know This Already?” Quiz 439
    Foundation Topics 442
    Hardening the SSH Server 442
    Limiting Root Access 442
    Configuring Alternative Ports 443
    Modifying SELinux to Allow for Port Changes 443
    Limiting User Access 444
    Using Other Useful sshd Options 445
    Session Options 446
    Connection Keepalive Options 446
    Configuring Key-Based Authentication with Passphrases 447
    Summary 448
    Exam Preparation Tasks 448
    End-of-Chapter Lab 450
    Chapter 21 Managing Apache HTTP Services 453
    “Do I Know This Already?” Quiz 453
    Foundation Topics 456
    Configuring a Basic Apache Server 456
    Installing the Required Software 456
    Identifying the Main Configuration File 456
    Creating Web Server Content 459
    Understanding Apache Configuration Files 460
    Creating Apache Virtual Hosts 462
    Summary 464
    Exam Preparation Tasks 464
    End-of-Chapter Lab 466
    Chapter 22 Managing SELinux 469
    “Do I Know This Already?” Quiz 470
    Foundation Topics 473
    Understanding SELinux Working Modes 473
    Understanding Context Settings and the Policy 477
    Monitoring Current Context Labels 477
    Setting Context Types 479
    Finding the Context Type You Need 482
    Restoring Default File Contexts 483
    Managing Port Access 484
    Using Boolean Settings to Modify SELinux Settings 485
    Diagnosing and Addressing SELinux Policy Violations 487
    Making SELinux Analyzing Easier 489
    Summary 490
    Exam Preparation Tasks 491
    End-of-Chapter Lab 492
    Chapter 23 Configuring a Firewall 495
    “Do I Know This Already?” Quiz 495
    Foundation Topics 498
    Understanding Linux Firewalling 498
    Understanding Previous Solutions 498
    Understanding Firewalld 498
    Understanding Firewalld Zones 499
    Understanding Firewalld Services 500
    Working with Firewalld 501
    Summary 504
    Exam Preparation Tasks 504
    End-of-Chapter Lab 506
    Chapter 24 Accessing Network Storage 509
    “Do I Know This Already?” Quiz 509
    Foundation Topics 512
    Using NFS Services 512
    Understanding NFS Security 512
    RHEL NFS Versions 512
    Setting Up NFS 513
    Mounting the NFS Share 514
    Mounting Remote File Systems Through fstab 515
    Mounting NFS Shares Through fstab 515
    Using Automount to Mount Remote File Systems 516
    Understanding Automount 516
    Defining Mounts in Automount 516
    Configuring Automount for NFS 517
    Using Wildcards in Automount 517
    Summary 518
    Exam Preparation Tasks 518
    End-of-Chapter Lab 520
    Chapter 25 Configuring Time Services 523
    “Do I Know This Already?” Quiz 523
    Foundation Topics 526
    Understanding Local Time 526
    Using Network Time Protocol 527
    Managing Time on Red Hat Enterprise Linux 527
    Using date 528
    Using hwclock 528
    Using timedatectl 529
    Managing Time Zone Settings 531
    Configuring Time Service Clients 533
    Summary 534
    Exam Preparation Tasks 535
    End-of-Chapter Lab 536
    Chapter 26 Managing Containers 539
    “Do I Know This Already?” Quiz 539
    Foundation Topics 542
    Understanding Containers 542
    Container Host Requirements 543
    Containers on RHEL 9 544
    Container Orchestration 545
    Running a Container 545
    Working with Container Images 550
    Using Registries 550
    Finding Images 552
    Inspecting Images 553
    Performing Image Housekeeping 556
    Building Images from a Containerfile 556
    Managing Containers 558
    Managing Container Status 558
    Running Commands in a Container 559
    Managing Container Ports 561
    Managing Container Environment Variables 562
    Managing Container Storage 563
    Running Containers as Systemd Services 566
    Summary 568
    Exam Preparation Tasks 569
    End-of-Chapter Lab 570
    Chapter 27 Final Preparation 573
    General Tips 573
    Verifying Your Readiness 573
    Registering for the Exam 573
    On Exam Day 574
    During the Exam 575
    The Nondisclosure Agreement 576
    Chapter 28 Theoretical Pre-Assessment Exam 579
    Part V RHCSA 9 Practice Exams
    RHCSA Practice Exam A 581
    RHCSA Practice Exam B 583
    Appendix A: Answers to the “Do I Know This Already?” Quizzes and Review Questions 585
    Appendix B: Red Hat RHCSA 9 Cert Guide: EX200 Exam Updates 617
    Glossary 619

    Online Elements:
    RHCSA Practice Exam C
    RHCSA Practice Exam D
    Appendix C: Memory Tables
    Appendix D: Memory Tables Answer Key
    Appendix E: Study Planner
    Glossary


    9780138096274 TOC 3/24/2023

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