> I'm aware of runC but don't know if Docker images are realistically portable Until recently Cloud Foundry ran Docker images with a custom runtime backend (ga

> I'm aware of runC but don't know if Docker images are realistically portable Until recently Cloud Foundry ran Docker images with a custom runtime backend (garden-linux). It's since switched to using runC (garden-runc). So in principle it was always possible to do this. A major reason for the switch was to reduce duplicated effort. Disclosure: I work for Pivotal, a major contributor to Cloud Foundry. Insofar as Docker move towards the value line, we're competitors.