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====== BIND ======

https://kb.isc.org/docs
https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/deployment_guide/s2-bind-zone#s4-bind-zone-rr
<code>

rndc dumpdb                       # dump whole cache
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
rndc reload                       # reload all zones
rndc reload example.com           # reload zone example.com
named-checkzone example.com /var/lib/named/master/example.com
</code>

===== DDNS =====
Manual edit of zone file:
<code>
rndc freeze example.com
vi /var/lib/named/dyn/example.com
rndc reload example.com
rndc thaw example.com
</code>

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

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