Setting up a DNS server on the Pi

Now, we will learn about the practical part of setting up a Domain Name System server on our own cluster of Raspberry Pis so as to learn the intricacies of the system. We will set up a DNS server on the same Pi on which we set up the DHCP server earlier. Since we took care to see that it is easily identifiable from the other client Raspberry Pis, we can begin the setting-up procedure.

We use the same software, dnsmasq, which we used for the DHCP server, as it also has the capability to run a DNS server. Other than that, we don't need to install anything extra. As a sanity check, before beginning the following tutorial, try to ping the server from one of the clients. Although multiple DNS servers can be configured, for the purposes of this tutorial, we will be using only one Raspberry Pi as the server.

As the DNS server doesn't have a broadcast system like DHCP, the clients can't locate it easily. So they need to be told the IP address of the DNS server, and...