Useful tools for DNS operation with BIND

Configuration checkers
named-checkzone, named-checkconf
perform those before reloading server
rndc
control command for BIND
(was "ndc" in BIND8)
reload: reloading server with new config
dumpdb: dump internal cache DB to a file
querylog: enable per-query logging
use "rndc-confgen" for setup
dig/host/nslookup
powerful diagnostic tools