As announced, dotCloud Sandbox is an open-source project which tries to replicate the sandbox flavor of dotCloud: a free and easy way to build web applications.
Sandbox takes your application and its dotcloud.yml as input and outputs a Docker image for each service that can be built; it doesn't support databases (yet?).
Sandbox tries to mimic the original dotCloud build process but a few differences exist:
- database credentials won't be generated in environment.json;
- postinstall is not executed (databases are supposed to be available when it's run), but you can probably use a post-build hook instead.
- Docker (This is developed against master, but pretty much any release done after April 2013 should work);
- Python 2.7 (older versions won't work);
- A C compiler and the Python development headers.
The full documentation is reachable at http://sandbox.dotcloud.com/.