I just started playing with docker and it is very cool, but I am not sold on complete isolation of every service in a stack.<p>I've taken to building my containers using packer & ansible, with docker acting as something between git and an lxc client.<p>If you run your tests against live instances do you deploy the exact same container? How do you control environmental or configuration drift?<p>I'd be interested in seeing a CI tool on top of docker :)