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BIND

rndc reload example.com
rndc flushname example.net        # clear example.net from cache
rndc flushtree example.net        # clear example.net and *.example.net from cache
rndc flush                        # clear whole cache
named-checkzone example.com /var/lib/named/master/example.com

DDNS

Manual edit of zone file:

rndc freeze example.com
vi /var/lib/named/dyn/example.com
rndc reload example.com
rndc thaw example.com

zone example.com/IN: journal rollforward failed: not exact
zone example.com/IN: not loaded due to errors.

systemctl stop named
rm /var/lib/named/dyn/example.com.jnl
systemctl start named