Docker on Docker is way cool. The use case we're trying to solve here is a tad different though: it's to provide virtual infrastructure for the "first level" i

Docker on Docker is way cool. The use case we're trying to solve here is a tad different though: it's to provide virtual infrastructure for the "first level" i.e. in the case of Docker the outer container host. For Docker the answer could be EC2, since Docker itself doesn't need VT. However that precludes you from using KVM in any layer below, which in turn means Linux only and fairly simple networking (no multicasting even in VPC, and hence no VXLAN for example) We very much wanted to create something to assist OpenStack developers in developing OpenStack itself. It should be especially useful for projects such as Nova, Neutron and Ironic.