As you all probably know that using Apple’s DNS server can be challenging at times. If you make changes on the primary you usually have to wait some time before those changes propagate to the secondaries. However with the following commands you can force this propagation without having to nuke files or folders in /var/named
1. On the secondary server, run this command. (use whatever zone you want to transfer in place of lan.example.com
rndc -p 54 retransfer lan.example.com IN com.apple.ServerAdmin.DNS.public
2. Reload configuration
rndc -p 54 reload
3. Forcing client cache flush
The reason I think this is better in my opinion is it gets rid of the potential “oops” of deleting critical files in /var/named.