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I want to set up a DNS server on my network. I want to keep it simple and just use $(hostname -s).catpants.lan as the DNS entry for each system on my network. Internal DNS only.

Is there a way I can make each of my systems automatically tell the DNS server their hostname and IP? Or do I have to edit a config on my DNS server every time I spin up a new vm? Is there a name for this particular way of doing DNS?

To keep it simple, all systems on my network are running Linux.

  • DHCP might be worth a look, but I'm actually not sure in which direction the hostname info flows. – Ulrich Schwarz Oct 23 '15 at 21:13
  • I believe there are clients that will do dynamic DNS for nameservers like BIND, but I don't know much about that. You might be interested in AVAHI. It's an auto host-name advertising service that runs on your local network. When setup, it Just Works. It's also built into MacOS, and there's a simple Windows client available from Apple to bring the third OS into the mix. If you install avahi-daemon, you should soon be able to ssh machinea from machineb, and vice versa. – Paul Oct 23 '15 at 21:18
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If you use the ISC DHCP client (dhcp-client on Debian, Ubuntu, etc.) then you most definitely can set the hostname via /etc/dhcp/dhclient.conf. On recent versions, this is accomplished by:

    send host-name = gethostname();

On earlier versions, you had to hardcode the hostname in the directive.

I'm not so sure about setting the IP address through the DHCP lease process, but there is a "fixed-address" directive in the dhclient.conf which would appear to do what you want. See the dhclient.conf manpage.

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