Secondary/Slave DNS server not getting new zones

[tlovrec]

Hello,

I have a little problem with my Slave DNS server.
When I add a zone in cPanel it gets inserted into /etc/named.conf, and creates a zone file as it should on the Primary server. But the Secondary server doesn't get that zone, not in /etc/named.conf nor does it create zone files.
If I manualy add the zone in /etc/named.conf on the Secondary server and create the zone files then it updates on changes as it should.
Now this works for me just good I have no problems adding manualy to the secondary, but my client wont like it this way.
Can anyone point me to the right direction of what I must do?
Thank you!

Regards,
Thomas

[tlovrec]

Is this a cPanel problem or should I be looking in DNS configurations?

[cPanelDavidG]

Primary/Slave DNS server configurations are no longer recommended, DNS Clustering is preferred.