Google creates two billion Linux containers a week which astute readers will realize implies that they can be created much more quickly than a VM.  That is indeed the case, these Linux containers are very similar to Solaris Zones, BSD Jails and other similar ways of sharing parts of an OS across multiple isolated applications as opposed to VMs in which each machine has it's own OS.  Even with prebuilt images it is orders of magnitude slower to create a VM than to simply create a new container.  With the involvement of a startup called Docker, Google has really changed how they handle their systems; read about the impacts at The Register.

"That tech is called Linux Containerization, and is the latest in a long line of innovations meant to make it easier to package up applications and sling them around data centers. It's not a new approach – see Solaris Zones, BSD Jails, Parallels, and so on – but Google has managed to popularize it enough that a small cottage industry is forming around it."

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