Symptoms
How to force secondary/slave Name server to update/refresh dns zones from primary DNS server?
You want a slave name server to initiate a zone transfer immediately.
Resolution
Execute the following command:
# rndc reload domain.tld
If you run tail -f /var/log/named.log on the Master you should see the following
named[19439]: client 1.2.3.4#33606: received notify for zone 'domain.tld'
named[19439]: master 1.2.3.4#53 (source 0.0.0.0#0) deleted from unreachable cache
named[19439]: zone domain.tld/IN: Transfer started.
named[19439]: transfer of 'domain.tld/IN' from 1.2.3.4#53: connected
named[19439]: zone domain.tld/IN: transferred serial 128
named[19439]: transfer of 'domain.tld/IN' from 1.2.3.4#53: Transfer completed: 1 messages, 13 records, 371 bytes, 0.001 secs (371000 bytes/sec)
named[19439]: zone domain.tld/IN: sending notifies (serial 128)