Gitlab gets a lot of love around here on Hacker News. I'm sure there's a lot of people setting up their own servers and maybe running into some questions/problems around setting up Docker-in-Docker style builds. There's some information out there, but I decided to put together a comprehensive-ish guide that maybe could be of use. Let me know if you have any questions!
This looks like a nice write up guide, was just wondering here, how do you keep docker builds tags from clashing if they're all running on the same Docker instance?
Sadly they have to operate cooperatively. :/ I've taken great pains to prefix all of my builds with "${CI_JOB_ID}" and add a `clean` step at the end to tear down all created images. It's not perfect, but it works well enough in a trusted environment.