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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Monitoring processes and load averages

The load average is the average of the load for a given period of time on each CPU. It takes into account the following:

  • Actively running processes (including each thread as an individual, separate task) on a CPU core.

  • Runnable processes, waiting for a CPU to become available.

  • Sleeping processes, for example, waiting for some kind of resource (generally disk I/O or network I/O) to become available.

  • Linux counts each physical CPU core and microprocessor hyper-thread as separate execution units, and refers to them as individual CPUs. Each CPU has an independent request queue. We can count the total number of system CPUs using by the following command:

    $ grep "model name" /proc/cpuinfo | wc -l

Understanding load averages on Linux...

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