Nsupdate

nsupdate is DNS tool packaged with BIND 9+.

updating a DNSSEC-signed zone
You are using BIND 9.8, and you have a signed zone. You can't edit the zonefile with a text editor, but must use nsupdate to update the zone, since it's auto-signed.

You are on the master server, THis connects you to the local server, bypassing the need for keys This prepares an update to the server, but does not send it yet. This shows you the update that will be sent. This sends your update to the server. This shows you the answer the server gave to your query.