Subdomain

[Kingman]

I have a domain setup on server 1 with a number of subdomains. I want one of the subdomains to be served from server 2.

The DNS zone for this domain is on server 1 at the moment and I've set it all up okay to have the subdomain on server 2:

subd IN A 222.222.222.222

This is all working fine at the moment but the problem is (and I'm thinking ahead here so if I'm wrong let me know) if server 1 goes down, this will mean the DNS zone is not accessable so the subdomain on server 2 will not work even though the actual server (2) is up.

I'm guessing some kind of slave DNS will need to be setup for this domain only on server 2, then the nameservers of the domain changing to ns1.domain.com (server 1) and ns3.domain.com (server 2).

Is this correct? How would I do this?

Thanks

 

[Kingman]

Thanks for your reply.

I saw a post by itf on master/slave DNS but got the impression that this will mirror all the DNS zones on the server where I only want to do this with one.

It doesn't even need to be automatic and can be kept updated on both manually but I'm unsure of the process involved in setting it up.