Solaris/Illumos/SmartOS (Joyent's O/S, Joyent being Cantrill's company that offers a public cloud like AWS), has built-in lightweight containers that have all t

Solaris/Illumos/SmartOS (Joyent's O/S, Joyent being Cantrill's company that offers a public cloud like AWS), has built-in lightweight containers that have all the right isolation characteristics (esp. security) Docker/CoreOS build upon Linux primitives for isolated name spaces, but security is a problem because of Linux's flawed implementation. But Docker is the flavor of the month, even though it is technically inferior to SmartOS's. So they (Joyent, Cantrill's company) wrapped SmartOS with the docker remote API, so when you do 'docker ps', you see all the VMs in the entire data center. The whole cloud works as one machine.