[rartichoke]

I almost got excited but then yawned.

It's nice but it still doesn't fix the issue with people who have medium end machines where you develop in a VM full time and want to be able to run a VM within a VM.

For example with fairly old but still reasonable hardware you cannot run virtualbox inside of an existing virtualbox instance.

If you have a windows box and develop full time in a linux VM you cannot run vagrant inside of that linux VM because unless you have a modern CPU it lacks the instruction sets required to run virtualization within virtualization.

Now using docker instead of a VM would work but docker only supports 64 bit operating systems so anyone stuck with a 32bit host OS still can't use vagrant and has to resort to using raw linux containers without docker which is really cumbersome.

[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.