via @RIPE_NCC
via http://everythingsysadmin.com/2017/04/dnscontrol-blogpost.html
via @fcambus via @jedisct1
via https://www.reddit.com/r/Sysadmin_Fr/comments/5wzo5v/sshfp_faciliter_lauthentification_dun_serveur_ssh/
via https://community.letsencrypt.org/t/caa-setup-for-lets-encrypt/9893/8
