Looking for documentation for cPanel with DNS only

Check twiki.

Here is the link.

Guide to DNS Cluster Configuration

I hope this is what you are looking for.

 

Port 2087 is for secure WHM (DNS Only) access and not for synchronizing DNS records. It is recommended to use secure access to WHM rather than unsecured log in.

 

Actually, all DNS clustering commands are sent via WHM ports, so port 2087 is used for synchronizing DNS records. The user would initiate the transaction from the WHM on one server, which would then connect to the other server(s) in the cluster on port 2087 to issue the clustering commands.

In short, you do need to leave port 2087 open in order for your DNS cluster to work.

 

Thanks for clearing that. I never thought WHM ports were used for this.

 

Sounds like you may be in a little over your head ....

Anyway though, the "DNS ONLY" version of Cpanel and regular "Cpanel" are identical in the way they operate from the user perspective.

Both login to their respective WHM interfaces using:

http://x.x.x.x:2086/ (non ssl :: where x.x.x.x is your server's IP)

https://x.x.x.x:2087/ (ssl encrypted connection)

The "DNS Version" is just simply stripped of all hosting features and really only has the options and setup configuration needed to establish a cluster configuration with an actual Cpanel server someplace else.

The DNS server itself needs port 53 but you also have to have the standard Cpanel ports open in any firewall you add as well inbound whatever port you choose for SSH and outbound port 25 if you would like your server to actually be able to notify you of any problems.