To add to bildung's comment, what many of us are wondering is given all the existing tools and complexity, why add another integration point? In the scenario y

To add to bildung's comment, what many of us are wondering is given all the existing tools and complexity, why add another integration point? In the scenario you're describing where you're provisioning virtual machines in a cloud, shuffling docker containers around on a fleet of VMs may not be the way to go. Many people would use some combination of disk images and configuration management to achieve the same ends.