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.
Table of Contents (11 chapters)

Configuring hostnames and name resolutions

Hostname and DNS servers play an important role in networking as a machine is reachable in a network either by the IP address or hostname. The DNS server is responsible for the IP address to domain name and domain name to IP address conversion. This process of conversion is also known as name resolution or DNS resolution.

Since CentOS 7, the static host name has been stored in a new file, /etc/hostname. In earlier versions, it was stored in the /etc/sysconfig/network file. Now, a new command has been introduced with the name hostnamectl, to view and modify the hostname of machine.

Displaying and modifying the hostname

The hostname command is used to view the hostname or to temporarily...