Book Image

CompTIA Linux+ Certification Guide

By : Philip Inshanally
Book Image

CompTIA Linux+ Certification Guide

By: Philip Inshanally

Overview of this book

The Linux+ certification provides a broad awareness of Linux operating systems, while giving professionals an upper hand in the IT industry. With this certification, you’ll be equipped with the all-important knowledge of installation, operation, administration, and troubleshooting services. This CompTIA Linux+ Certification Guide will give you an overview of the system architecture. You’ll understand how to install and uninstall Linux distributions, followed by working with various package managers. You’ll then move on to manipulating files and processes at the command-line interface (CLI) and creating, monitoring, killing, restarting, and modifying processes. As you progress, you’ll be equipped to work with display managers and learn how you can create, modify, and remove user accounts and groups, as well as understand how to automate tasks. The last set of chapters will help you configure dates and set up local and remote system logging. In addition to this, you’ll explore different internet protocols, and delve into network configuration, security administration, Shell scripting, and SQL management. By the end of this book, you’ll not only have got to grips with all the modules you need to study for the LX0-103 and LX0-104 certification exams, but you’ll also be able to test your understanding with practice questions and mock exams.

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Table of Contents (23 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
Configuring the Hardware Settings
Configuring the Hardware Settings
Viewing CPU, RAM, and swap info
Interrupts and devices
Modules
Summary
Questions
Further reading
2
Booting the System
Booting the System
The boot process explained
GRUB and GRUB2
Working with GRUB
Working with GRUB2
Summary
Questions
Further reading
3
Changing Runlevels and Boot Targets
Changing Runlevels and Boot Targets
Introduction to runlevels
Introduction to boot targets
Working with runlevels
Working with boot targets
Summary
Questions
Further reading
4
Designing a Hard Disk Layout
Designing a Hard Disk Layout
Using the fdisk utility
Using the parted utility
Steps to format a hard disk
Mounting and unmounting a partition
Summary
Questions
Further reading
5
Installing a Linux Distribution
Installing a Linux Distribution
Understanding the use of the LiveCD
Installing a Linux distribution as a fresh installation
Installing a Linux distribution side by side with a Windows OS
Installing Linux side by side with another version of Linux
Summary
Questions
Further reading
6
Using Debian Package Management
Using Debian Package Management
The dpkg command
The apt-get command
The aptitude command
The synaptic utility
Summary
Questions
Further reading
7
Using YUM Package Management
Using YUM Package Management
YUM
DNF
RPM
yumex
Summary
Questions
Further reading
8
Performing File Management
Performing File Management
Viewing and moving files and directories in the CLI
Creating, copying, moving, renaming, and removing files
Creating and removing directories
Finding files and directories
Pipes and redirects
Summary
Questions
Further reading
9
Creating, Monitoring, Killing, and Restarting Processes
Creating, Monitoring, Killing, and Restarting Processes
The ps command
Viewing and managing processes using the top command
Managing process(es) with the service command
Managing process(es) with the systemctl command
Summary
Questions
Further reading
10
Modifying Process Execution
Modifying Process Execution
The nice command
The renice command
Foreground processes versus background processes
Summary
Questions
Further reading
11
Display Managers
Display Managers
Working with the XDM
Working with the KDM
Working with the GDM
Working with the Lightdm
Summary
Questions
Further reading
12
Managing User and Group Accounts
Managing User and Group Accounts
Directory used when creating a new user
Managing user accounts
Managing groups
Summary
Questions
Further reading
13
Automating Tasks
Automating Tasks
Managing automation using the at, atq, and atrm commands
Managing automation using cron, crontab, and anacron
Permissions for tasks using configuration files
Summary
Questions
Further reading
14
Maintaining System Time and Logging
Maintaining System Time and Logging
Date configuration
Setting up local system logging
Configure remote logging
Summary
Questions
Further reading
15
Fundamentals of Internet Protocol
Fundamentals of Internet Protocol
IPv4 addressing
IPv6 addressing
Well-known protocols
Summary
Questions
Further reading
16
Network Configuration and Troubleshooting
Network Configuration and Troubleshooting
IPv4 configuration
IPv6 configuration
Client-side DNS
Network troubleshooting
Summary
Questions
Further reading
17
Performing Administrative Security Tasks
Performing Administrative Security Tasks
Host security
SSH
Encryption
Summary
Questions
Further reading
18
Shell Scripting and SQL Data Management
Shell Scripting and SQL Data Management
Shell scripting
SQL data management
Summary
Questions
Further reading
19
Mock Exam - 1
Mock Exam - 1
Questions
Answers
20
Mock Exam - 2
Mock Exam - 2
Questions
Answers
21
Assessment
Assessment
Chapter 1: Configuring the Hardware Settings
Chapter 2: Booting the System
Chapter 3: Changing Runlevels and Boot Targets
Chapter 4: Designing a Hard Disk Layout
Chapter 5: Installing a Linux Distribution
Chapter 6: Using Debian Package Management
Chapter 7: Using YUM Package Management
Chapter 8: Performing File Management
Chapter 9: Creating, Monitoring, Killing, and Restarting Processes
Chapter 10: Modifying Process Execution
Chapter 11: Displaying Managers
Chapter 12: Managing User and Group Accounts
Chapter 13: Automating Tasks
Chapter 14: Maintaining System Time and Logging
Chapter 15: Fundamentals of Internet Protocol
Chapter 16: Network Configuration and Troubleshooting
Chapter 17: Performing Administrative Security Tasks
Chapter 18: Shell Scripting and SQL Data Management
22
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Working with the GDM

GDM is another popular display manager available in today's Linux environments. Particularly in Red Hat distributions such as CentOS and Fedora, you will find GDM. This provides a GUI login prompt where the user is given an opportunity to provide their login credentials. Furthermore, if we have multiple desktops installed, we can also select which desktop to load once logged in. As we saw earlier, we can determine which display manager we would prefer to work with. Let's choose our Ubuntu system for this demo. First, let's check whether GDM (GDM3 in Ubuntu) is installed on our Ubuntu 16 system:

root@ubuntu:/etc# ls /etc/ | grep gdm3
root@ubuntu:/etc# ls /etc/X11/
app-defaults  default-display-manager  openbox  xdm    xkb                 Xreset    Xresources  Xsession.d        xsm
cursors   fonts       rgb.txt  xinit  xorg.conf.failsafe  Xreset...
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