In this chapter, you will also learn how to set
up openSUSE as a DNS client in YaST, edit DNS configuration
files, use tools such as nslookup to gather information,
and finally, learn the fundamentals of using Linux as a
DNS server.
Essential DNS Concepts
The DNS is a distributed and hierarchical database whose function is to resolve hostnames
to IP addresses. As mentioned earlier, this is really the only reason DNS is used. As a
matter of fact, using DNS adds latency and complexity to any configuration management
you need to do, such as changing the DNS information itself. Because the DNS database is
distributed, those changes need to replicate through the DNS system, whether it is hosted
locally within your network privately, is a public DNS server communication with other
public DNS servers to replicate changes, or a hybrid of both. DNS is worth every ounce of
issue you may derive from it, so let??™s start by taking a look at how to configure it locally
on your openSUSE system so that you can use and test it.
In the following example and illustration, DNS will be shown step by step and simplified
as much as possible, although entire books are dedicated to the subject because of its
depth and complexity.
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