setup DNSSEC on Bind9

# cd /etc/bind

Add these lines to your zone declaration in named.conf.local:

inline-signing yes;
auto-dnssec maintain;

Then:

# mkdir /etc/bind/zones
# cd /etc/bind/zones

  Here, create your zone file: example.com.db

# mkdir /etc/bind/keys
# cd /etc/bind/keys
# dnssec-keygen -a ECDSAP256SHA256 -b 4096 -f KSK example.com
# dnssec-keygen -a ECDSAP256SHA256 -b 2048 example.com
# for key in `ls Kexample.com*.key`
    do
    echo "\$INCLUDE $key">> ../zones/example.com.db
  done
# dnssec-signzone -A -3 $(head -c 1000 /dev/random | sha1 | cut -b 1-16) -N INCREMENT -o example.com -t ../zones/example.com.db
# cd /etc/bind 

Add to the zone "example.com" section in the file named.conf.local:

inline-signing yes;
auto-dnssec maintain;

Edit named.conf.options file, and add

key-directory "/etc/bind/keys";

to the options block.

# service named reload

# rndc loadkeys example.com
# rndc signing -nsec3param 1 0 10 auto example.com

Check the zone.

$ dig DNSKEY example.com. @localhost +multiline

An online DNSSEC ckecker is available here:

https://dnssec-analyzer.verisignlabs.com

That's it!

ADDING SUBDOMAIN

1. Add the subdomain records to the zone file, example.com.db.
2. Sign the zone with dnssec-signzone as mentioned above.
3. Restart named.
4. Check the zone.

TROUBLESHOOTING

zone example.com/IN: journal rollforward failed: journal out of sync with zone

If you get this error message, remove the jnl files and restart named.