Chapter 6: DNS Services on Linux

The Domain Name System (DNS) is a major underpinning of today's information-based society. A proverb used within the technical community (phrased in haiku format) is shown here:

It's not DNS

There is no way it's DNS

It was DNS

This describes more technical problems than you might think, up to widespread internet or cloud service outages. It also nicely describes the progression of how a problem is solved, with the answer: "The root problem is always DNS." This nicely illustrates just how important this service is to almost every facet of today's corporate networks and public internet.

In this chapter, we'll cover several topics that involve DNS basics, then build—and finally, troubleshoot—DNS services. We'll look at the following areas:

• What is DNS?
• Two main DNS server implementations
• Common DNS implementations
• DNS troubleshooting and reconnaissance

Then...