Can I add ispconfig to my current DNS server, By that I mean, can I just add the needed parts to my centos 5.9 server , running bind9, setup the mysql etc etc. as per all these great tutorials here. Then get it to use or import the " current dns " settings for all zones ( over 250 ) Then I add my ns2, and even ns3 as per tutorials, so all will be synced, and only ever adding/removing zones from the master NS1.
Better start from a empty server after dpoing a backup of sour zones and then import thr zone files in ispconfig.