[nXqd]

As a devops user, this would be not so useful. It was my first thought when I saw this. But, wait a minute, if this can replace MAMP, or XAMPP, it would be great. It will help the new user get the development environment setting up in no time, isolated environment and beautiful application. It would be a win.

Nice work !

[lfx]

For the same reason I use Vagrant. I would like to hear why would anybody use Docker instead of Vagrant and vice versa?

[mikeflynn]

One difference is that Vagrant is a full stand-alone server VM rather than a shared container like Docker, so Vagrant is better for housing multiple services in a single Vagrant instance, while Docker is better off housing a single-use application/service.

Example: If you wanted to run a complex local dev environment with apache, mysql, memcache, varnish, etc... You could run that all in a single large VM (provisioned and booted by Vagrant) or by multiple Docker containers (one for each service).

[chanux]

I don't know about OS X but on Linux Docker is so much better than Vagrant (not really, it's the VMs). But that's just my opinion.