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Docker Moves Beyond Containers With Unikernel Systems Purchase (thenewstack.io)
joabj writes: Earlier today, Docker announced that it had purchased the Cambridge, U.K.-based Unikernel Systems, makers of the OCaml-based MirageOS, a unikernel or "virtual library-based operating system." Unikernels go beyond containers in stripping virtualization down to the bare essentials in that they only include the specific OS functionality that the application actually needs. Their design builds on decades of research into modular OS design. Although unikernels can be complex to deploy for developers, Docker aims to make the process as standardized as possible, for easier deployment.
Docker allows you to run an executable in a container with no setup and provides resource allocation, two features which jails don't support. Like jails, docker can also use an existing container as an overlay on the base system. Docker can dynamically limit CPU utilization and memory, and it supports prioritization including disk IO. You have full control over the container including stopping execution, freezing the contents, and restarting later.
At this point, jail is a poor man's docker, and FreeBSD suffers from people in the community (like yourself) that dismiss docker.