[rartichoke]

I'm not sure why I got down voted to eternity.

If you have a great dev box with a ton of ram then using docker or a VM is irrelevant. You can just set the whole thing up in a ram drive and things are nearly instant, assuming you're using virtualization for short lived tests on some provisioned server that matches your prod env.

With an older machine and a 32bit OS (ie. 2 gigs of ram) you can't do anything except run 2x 512mb VMs side by side within a host or a single ~1GB VM on its own so it's a real let down to see they decided to use docker instead of just plain LXCs which do work with a 32bit OS.