There are probably several pieces that are still missing but I'm going to open up Danbooru 2 for public testing anyway.
You can visit it here: http://testbooru.donmai.us
It's a completely new database so you'll have to create a new account.
AFAIK everything is there, I just need help testing to make sure nothing is broken or I didn't forget an important component of the current site.
The entire Danbooru 2 project is hosted on Github: https://github.com/r888888888/danbooru
If you're interested, you can fork the project and submit pull requests. I'm not interested in major changes at this point: I just want something I can deploy and migrate to ASAP.
Of particular interest in the new INSTALL.debian script https://github.com/r888888888/danbooru/blob/master/INSTALL.debian which I've tested on a VM. I know everything up to the cap deploy works correctly.
Issues should be reported on Github: https://github.com/r888888888/danbooru/issues?sort=created&direction=desc&state=open
Updated by Alignn