Book Image

Linux Administration Cookbook

By : Adam K. Dean
Book Image

Linux Administration Cookbook

By: Adam K. Dean

Overview of this book

Linux is one of the most widely used operating systems among system administrators,and even modern application and server development is heavily reliant on the Linux platform. The Linux Administration Cookbook is your go-to guide to get started on your Linux journey. It will help you understand what that strange little server is doing in the corner of your office, what the mysterious virtual machine languishing in Azure is crunching through, what that circuit-board-like thing is doing under your office TV, and why the LEDs on it are blinking rapidly. This book will get you started with administering Linux, giving you the knowledge and tools you need to troubleshoot day-to-day problems, ranging from a Raspberry Pi to a server in Azure, while giving you a good understanding of the fundamentals of how GNU/Linux works. Through the course of the book, you’ll install and configure a system, while the author regales you with errors and anecdotes from his vast experience as a data center hardware engineer, systems administrator, and DevOps consultant. By the end of the book, you will have gained practical knowledge of Linux, which will serve as a bedrock for learning Linux administration and aid you in your Linux journey.
Table of Contents (15 chapters)

Modern domain name resolution on Linux

In this section, we're going to look at domain name resolution, and specifically the software installed on a typical CentOS box that enables the lookup of addresses when presented with a domain.

We'll look at /etc/resolv.conf and domain name resolution methods on current generation Linux systems (such as network manager). We're going to test the connection to our DNS server, and run DNS queries to see if it's working.

This section assumes a basic understanding of domain names and IP addresses.

Getting ready

Connect to centos1 and check that your domain resolution is already working by pinging an address.

I'm in the UK, so I default to using the BBC for my tests...