Each web server needs to be able to update the DNS when a site is brought
up on it. They do so by talking to the master DNS server, using nsupdate(1)
and a key.
ikidns handles management of the keys, and configures the master DNS server
to accept them for each configured toplevel domain name.
/etc/bind/$domain/db/zonefile is the zone file for a domain. A stub file
will be generated from a template if it doesn't exist, but probably needs
to be configured. As nsupdate(1) is used to add subdomains, bind
will first add them to a journal file, and later update this file to list them.
/etc/ikiwiki-hosting/ikiwiki-hosting.conf is the config file read by
/etc/ikiwiki-hosting/templates/ holds templates of bind config and zone files