Why three? Usually you would
have a primary, a secondary, and a tertiary name server from which to get information.
For disaster recovery purposes, it??™s common to have more than one single DNS server on
which to rely. Relying on a single DNS server means all your eggs are in one basket, and if
an egg cracks, you are out of name resolution! As you can see from this simple example,
it??™s common to have multiple DNS server settings on which to rely.
The domain search list is the list of domain names where hostname searching begins??”and
hopefully ends with the proper name resolution applied to the client. You can add multiple
names in the search list, although it??™s commonly seen, and used, with only one domain name.
Hosts File
Multiple files on your openSUSE system will allow you to modify DNS information. To
work with the hosts file, which we have already discussed and worked with in the /etc
directory, we will look at how to use YaST to make those same changes. As you saw earlier,
open YaST and navigate to the Network Services menu in the YaST Control Center.
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