Read my lips, says Docker: Containers aren't VMs

Repeat after me: Containers are not "lightweight VMs." Nor are they meant to replace VMs. Not now, and not anytime soon, either.

That's one of the key messages -- sometimes subtly stated and sometimes not so subtly -- that Docker and its cohorts have been broadcasting for some time about their brave new (well, not totally new) technology.

And now that containers have moved from the "wait, what's this?" to the "what's the best way to use this?" phase, maintaining the distinction between containers and VMs has become even more important to proponents of container tech.

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