Hostname resolution of Linux machines with static IP

Question

I have couple of linux servers that I to assign static IPs to because I'm doing some CARPing and Vlans.

The way my DNS server is set, it gets the hostnames dynamically from the nodes, as soon as there is a new node on the network.

This approach only works unfortunately for servers with dhcp clients. To send hostname, you edit /etc/dhcp3/dhclient.conf file with hostnames, and restart dhclient.

Anyone knows of a way to do this with servers with static ip's?

Answer 1

Yes, you can use nsupdate in your /etc/network/if-up.d/ directory.

For example

echo -e "server ns1.domain\n zone domain\n update delete test.domain\n update add test.domain 600 A 10.1.1.188\n send" | nsupdate

In long form, this is:

nsupdate
> server ns1.domain
> zone domain
> update delete test.domain
> update add test.domain 600 A 10.1.1.188
> send

So this saying

1. Choose the ns1.domain name server
2. update the "domain" zone
3. Delete the current record
4. Add the new record
5. Send to name server

On the name server, you will need to allow updates, which in bind is the directive:

allow-update { 10.10.10.0/24; };

This would allow updates from the 10.10.10.0/24 network