Book Image

CentOS Quick Start Guide

By : Shiwang Kalkhanda
Book Image

CentOS Quick Start Guide

By: Shiwang Kalkhanda

Overview of this book

Linux kernel development has been the worlds largest collaborative project to date. With this practical guide, you will learn Linux through one of its most popular and stable distributions. This book will introduce you to essential Linux skills using CentOS 7. It describes how a Linux system is organized, and will introduce you to key command-line concepts you can practice on your own. It will guide you in performing basic system administration tasks and day-to-day operations in a Linux environment. You will learn core system administration skills for managing a system running CentOS 7 or a similar operating system, such as RHEL 7, Scientific Linux, and Oracle Linux. You will be able to perform installation, establish network connectivity and user and process management, modify file permissions, manage text files using the command line, and implement basic security administration after covering this book. By the end of this book, you will have a solid understanding of working with Linux using the command line.

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Table of Contents (11 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
Getting Started with CentOS 7
Getting Started with CentOS 7
Preparing to install CentOS 7
Performing manual installation
Accessing the command line using the console
Introducing the Bash shell
Bash shell and command execution
Summary
2
Command-Line and Filesystem Navigation
Command-Line and Filesystem Navigation
Understanding the CentOS 7 filesystem hierarchy
Using man pages and the help command
Managing filenames with path expansion
Managing files using command-line tools
Managing archives and compressed files
Summary
3
Managing Text Files
Managing Text Files
Different methods to create a text file
Editing files with the vi editor
Using text file manipulation tools
Redirecting output to files and programs
Using grep for text matching
Finding a file (locate and find commands)
Summary
4
User and Group Management
User and Group Management
Understanding users and groups in CentOS 7
Executing commands as superuser in CentOS 7
Creating, modifying, or deleting local user accounts
Creating, modifying, or deleting local group accounts
Managing user passwords and aging policies
Summary
5
Managing File Permissions
Managing File Permissions
Understanding Linux filesystem permissions
Managing file permissions
Managing file ownership
Special permissions
Managing default permissions
Managing ACL on files
Summary
6
Process Management
Process Management
Understanding processes
Viewing current processes
Communicating with processes using signals
Monitoring processes and load averages
Managing a processes' priority with nice and renice
Controlling jobs on the command line
Summary
7
Managing Networking in CentOS
Managing Networking in CentOS
Linux networking concepts
Using Linux networking commands
Managing a network with nmcli
Editing network configuration files
Configuring hostnames and name resolutions
Accessing remote logins with SSH
Transferring files in Linux
Summary
8
Software Package Management
Software Package Management
Managing applications using RPM
Managing applications using YUM
Managing official and third-party repositories
Creating custom repositories
Summary
9
Overview of Essential Advance Utilities
Overview of Essential Advance Utilities
Understanding system logging
Understanding how to control the system and services
Understanding SELinux concepts
Understanding firewall concepts in CentOS 7
Summary
10
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Creating custom repositories

Creating a YUM repository is one of the easiest and best ways to install software or security updates on multiple systems over LAN. We can download all the packages from the internet repository or from the DVD and host them on the local server, which will be known as the YUM server. Other Linux machines on the LAN can be configured to download the required packages from the local YUM server and they will be known as the YUM clients. This saves internet bandwidth, provides offline installation of packages to clients, and speeds up the update process.

In this section, we will create a custom repository of the packages shipped in the CentOS 7 DVD and share this repository to clients using an FTP server, as follows:

  1. Mount the media containing the packages. In our case, it will be the CentOS 7 DVD, as shown here:
  1. Install the FTP server package, vsftpd...
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