Right. So when can I write:

    shards = []

    boot 'ec2', 'us-east-1', (server) ->
        shards.push server.start 'mongod_docker_image'

    boot 'ec2', 'us-west-1', (server) ->
        shards.push server.start 'mongod_docker_image'

    setTimeout ->
        shard.stop() for shard in shards
    , 5 * 60 * 1000

Does this exist yet? I started writing my own earlier today with Docker because I haven't found anything yet.

The plan is to cook a single ami that can be deployed ad infinitum. The image only has a slave application on it that receives and runs Docker images.

Pretty much.

A Docker AMI Generator exists. DigitalOcean offers an out of box Docker host. OpenShift will replace cartidges with Docker. OpenStack can provision Docker containers. Other PaaS/IaaS are in the works.

Running a registry is as simple as `docker run samalba/docker-registry`.

Pushing to that registry is very simple, especially if you have a reverse proxy ( I use hipache. Mine is registry.stinemat.es )

So, assuming those first 3 are in use in a 'convenient' way (as defined by you) - your request exists today. That matter of convenience will grow.

I would like to test out clustering and distributed computing on the cheap with a group of friends. So I would like to replicate an IaaS/PaaS/SaaS stack with vagrant-mesos-docker. I can then update my friends applications, OSs, and use their extra storage for a VPN service?