Book Image

Mastering Ubuntu Server - Fourth Edition

By : Jay LaCroix
4.8 (5)
Book Image

Mastering Ubuntu Server - Fourth Edition

4.8 (5)
By: Jay LaCroix

Overview of this book

Ubuntu Server is taking the server world by storm - and for a good reason! The server-focused spin of Ubuntu is a stable, flexible, and powerful enterprise-class distribution of Linux with a focus on running servers both small and large. Mastering Ubuntu Server is a book that will teach you everything you need to know in order to manage real Ubuntu-based servers in actual production deployments. This book will take you from initial installation to deploying production-ready solutions to empower your small office network, or even a full data center. You'll see examples of running an Ubuntu Server in the cloud, be walked through set up popular applications (such as Nextcloud), host your own websites, and deploy network resources such as DHCP, DNS, and others. You’ll also see how to containerize applications via LXD to maximize efficiency and learn how to build Kubernetes clusters. This new fourth edition updates the popular book to cover Ubuntu 22.04 LTS, which takes advantage of the latest in Linux-based technologies. By the end of this Ubuntu book, you will have gained all the knowledge you need in order to work on real-life Ubuntu Server deployments and become an expert Ubuntu Server administrator who is well versed in its feature set.
Table of Contents (26 chapters)
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Understanding Linux name resolution

In Chapter 11, Setting Up Network Services, we’ll have a discussion on setting up a DNS server for local name resolution for your network. But before we get to that, it’s also important to understand how Linux resolves names in the first place. Most of you are probably aware of the concept of a Domain Name System (DNS), which matches human-understandable domain names to IP addresses. This makes browsing your network (as well as the internet) much easier. However, a DNS isn’t always the first thing that your Linux server will use when resolving names.

For more information on the order in which Ubuntu Server checks resources to resolve names, feel free to take a look at the /etc/nsswitch.conf file. There’s a line in this file that begins with the word hosts. Here is the output of the relevant line from the file on my server:

hosts:          files mdns4_minimal [NOTFOUND=return] dns mymachines

In this case,...