August 2021
Intermediate to advanced
542 pages
11h 16m
English
Content preview from Linux Cookbook, 2nd Edition
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Chapter 16. Managing Local Name Services with Dnsmasq and the hosts File
Dnsmasq is an excellent server for LAN name services, both Domain Name System (DNS) and Dynamic Host Discovery Protocol (DHCP). Dnsmasq also provides BOOTP, PXE, and TFTP, which are for network booting and installing operating systems from a network server. Dnsmasq supports IPv4 and IPv6, provides local DNS caching, and acts as a stub resolver.
This chapter covers setting up local DNS and DHCP using Dnsmasq and the /etc/hosts file together. /etc/hosts is the very old way of setting up DNS, mapping hostnames to IP addresses in a static file. /etc/hosts by itself is sufficient for very small networks.
Dnsmasq is designed for LAN name services. It is lightweight and simple to configure, especially in comparison to BIND, the dominant DNS server, which is heavyweight and has a rather steep learning curve.
Dnsmasq and /etc/hosts work great together. Dnsmasq reads the entries in /etc/hosts into DNS.
The DHCP server in Dnsmasq automatically integrates with DNS. All you need for Dnsmasq to create DNS entries for your DHCP clients is to configure your DHCP clients to send their hostnames to the DHCP server, which is the default in most Linux distributions.
There are four types of DNS servers: recursive resolvers, root name servers, top-level domain (TLD) name servers, and authoritative name servers.
Recursive resolvers answer DNS requests. A stub resolver, like Dnsmasq and systemd-resolved, forwards any requests it ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.