Book Image

Linux for System Administrators

By : Viorel Rudareanu, Daniil Baturin
Book Image

Linux for System Administrators

By: Viorel Rudareanu, Daniil Baturin

Overview of this book

Linux system administration is an essential aspect of maintaining and managing Linux servers within an organization. The role of a Linux system administrator is pivotal in ensuring the smooth functioning and security of these servers, making it a critical job function for any company that relies on Linux infrastructure. This book is a comprehensive guide designed to help you build a solid foundation in Linux system administration. It takes you from the fundamentals of Linux to more advanced topics, encompassing key areas such as Linux system installation, managing user accounts and filesystems, networking fundamentals, and Linux security techniques. Additionally, the book delves into the automation of applications and infrastructure using Chef, enabling you to streamline and optimize your operations. For both newcomers getting started with Linux and professionals looking to enhance their skills, this book is an invaluable hands-on guide with a structured approach and concise explanations that make it an effective resource for quickly acquiring and reinforcing Linux system administration skills. With the help of this Linux book, you’ll be able to navigate the world of Linux administration confidently to meet the demands of your role.
Table of Contents (21 chapters)
Part 1: Linux Basics
Part 2: Configuring and Modifying Linux Systems
Part 3: Linux as a Part of a Larger System

The resolv configuration file

The resolv.conf file is an essential configuration file in Linux systems that is used to configure DNS resolution settings. DNS is responsible for translating human-readable domain names (such as into IP addresses that computers can understand. This translation is crucial for accessing websites, services, and other network resources on the internet. The file is located in the /etc directory and contains information about the DNS servers that the system should use to resolve domain names.

The resolv.conf file is used by various networking programs, including the system resolver library, web browsers, and email clients. When a user tries to access a website or connect to a remote server using its hostname, the system uses the resolv.conf file to find the corresponding IP address.

The resolv.conf file consists of several directives that define the DNS servers to use and the search domains to append to hostnames. The following are the...