I think the problem the parent has with you're statement is you are saying "Docker is a crap security alternative"... but docker isn't marketed as a security so

I think the problem the parent has with you're statement is you are saying "Docker is a crap security alternative"... but docker isn't marketed as a security solution, it's a "logical" process isolation. It solves the "I want to run two apache's how do I stop them conflicting" problem. Not the "I don't trust what is being run here" problem, it has never been marketed as that, and you are presenting it as if it was. Docker is a great way to build up a machine, and logically define a machines capabilities. Your gripe about security is just completely irrelevant, it'd be like complaining that iPhoto doesn't increase OS X Security. Edit: So the answer to the original "Is docker good for security?" I would say "maybe, but that's not its intention or focus".