A DNS server manages name resolution of computers on a subdomain. For example, going to docs.cslabs.clarkson.edu you are using clarkson.edu's DNS server to find the ip address of cslabs. This would be the CSLabs' DNS server. Now we use the CSLabs' DNS server to find the ip address of docs.
Where are the files?
The files you need to edit are in /var/named/ on DNS1. They link to corresponding files in /var/named/chroot/var/named/. You need to be root to edit these files.
What needs to be changed?
game IN A 188.8.131.52 tremulous IN CNAME game
This snipped of the file shows that game.cslabs should be resolved 184.108.40.206. It then goes on to specify that tremulous.cslabs should resolve to the same address as game.cslabs.
3 IN PTR dns1.cslabs.clarkson.edu.
How to push the changes to DNS2
Make sure that the serial# has been changed in any edited files. Then run rndc reload.
To check that your changes worked properly use the nslookup command. Lets say that you wanted to check game.cslabs. You would run:
root@dns1 ~]# nslookup game.cslabs 220.127.116.11 Server: 18.104.22.168 Address: 22.214.171.124#53 Name: game.cslabs.clarkson.edu Address: 126.96.36.199 root@dns1 ~]# nslookup game.cslabs 188.8.131.52 Server: 184.108.40.206 Address: 220.127.116.11#53 Name: game.cslabs.clarkson.edu Address: 18.104.22.168