Description
DNS is the phonebook of the internet.
Definitions
Records
NS
Nameserver records gives a hint where to find the nameserver for the subdomain. See https://serverfault.com/.
SSHFP
These records shows the fingerprint of your SSH server. Your DNS server needs to have DNSSEC enabled, otherwise this will not work.
https://unix.stackexchange.com/questions/121880/how-do-i-generate-sshfp-records
Tools
Flushing
Sometime it's nessesary to flush the DNS servers of the big companies. These are the URL's to activate.
Servers
Knot
Logging
Normally Knot is not logging anything. If you really want this, take a look at https://jpmens.net/.