Very nice work! Your defaults and choices show that you have experience in the field.

What I would really like to see is good documentation and the command line you run on my server every time I hit save. Server administritation is opinionated work, so I would like to know your choices for when I will need to fix the server myself. I think the way you ask the admin to configure the services himself is great!

Also I would like to see support for alternative nameservers. Bind imo is overkill for most cases. I get good mileage from powerdns.

A few minor issues:

  - customers should be allowed to add domains themselves
  - rules for passwords should be shown beforehand