We're starting to look at Docker (and liking what we're seeing so 
far)..however :

My development environment is OSX + Vagrant + Vmware Fusion plugin, 
spinning up Ubuntu 14.04 LTS images.

I'm reading https://docs.vagrantup.com/v2/docker/basics.html 

Is it saying I can spin up a Ubuntu 14.04 LTS VMware image and host my 
docker container inside?  Can I customize the host VM?  how so?

HOST VM

On systems that can't run Linux containers natively, such as Mac OS X or 
Windows, Vagrant automatically spins up a "host VM" to run Docker. This 
allows your Docker-based Vagrant environments to remain portable, without 
inconsistencies depending on the platform they are running on.

Vagrant will spin up a single instance of a host VM and run multiple 
containers on this one VM. This means that with the Docker provider, you 
only have the overhead of one virtual machine, and only if it is absolutely 
necessary.

By default, the host VM Vagrant spins up is backed by boot2docker 
<https://github.com/mitchellh/vagrant/blob/master/plugins/providers/docker/hostmachine/Vagrantfile>,
 
because it launches quickly and uses little resources. But the host VM can 
be customized to point to *any* Vagrantfile. This allows the host VM to 
more closely match production by running a VM running Ubuntu, RHEL, etc. It 
can run any operating system supported by Vagrant.

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