This avoids the peril of having a single point of failure for your DNS servers.
Unlike caching or forwarding DNS servers or a multi-purpose DNS server, authoritative-only servers only respond to iterative queries for the zones that they are authoritative for.
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They only care about the zones that they are designed to serve.
For the purposes of this guide, we will actually be referencing three servers.
On each of your name servers, you can now install Bind, the DNS server that we will be using.
The Bind software is available within Ubuntu's default repositories, so we just need to update our local package index and install the software using Run this installation command on your master and slave DNS servers to acquire the appropriate files.
We can then add the unqualified name as an alias at the end.
For the master server in this example, you would change the second line to this: Your servers should now have their host definitions set correctly.
This is "master" in this case since we are configuring this machine as the master name server for all of our zones.
We also point Bind to the file that holds the actual resource records that define the zone.
With hosting providers, the reverse mapping is usually taken care of by the company itself.