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From: Chris Searle on 2 May 2010 05:10
Running on lenny I have dhcp3-server set to ddns (interim) updating bind9.

This works fine as is.

Each recognised host on the network is identified by its mac address - something like:

host hostname {
hardware ethernet XX:XX:XX:XX:XX:XX;
fixed-address 192.168.1.X;
ddns-hostname "hostname";
}

(guest hosts get handled via a call to ddns-hostname = binary-to-ascii(10, 8, "-", leased-address); and are not an issue here).

The thing is - for some of the hosts I could really use some CNAME aliases added to DNS.

What I'd like to get is the effect of:

host hostname {
hardware ethernet XX:XX:XX:XX:XX:XX;
fixed-address 192.168.1.X;
ddns-hostname "hostname";
ddns-hostname-aliases "alias1, alias2";
}

Now - I know that ddns-hostname-aliases doesn't exist. Nor have I found anything like this via google - just other people looking for similar solutions.

However, it's the effect I'm trying to achieve here - of adding CNAMEs at the same time as adding an A record - and removing them at DHCP lease expiry.

I see that nsupdate can take a CNAME update.

nsupdate
> update add alias1.domain.tld 3600 IN CNAME hostname.domain.tld
> send

But I can't see any support in the current dhcpd setup for sending this.

Does anyone have any suggestions as to other ways to trigger the update? Perhaps someway to call nsupdate as a kind of trigger on update of dhcp or something?



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