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You may be shocked to discover that socket activation is actually a pretty old idea, and can even be found on non-Linux platforms. systemd embraces it in a pretty big way, but I can't see a problem getting the app containers to work with one of the other socket activation models.

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And you may be surprised that I ran socket activation well over 15 years ago, so yes I'm well aware of the approach. The comment is more around the fact that in CoreOS's post they seems to harp on the security of a daemon process running as root that is responsible for spawning containers. What I'm saying is that with socket activation you will essentially have that again. Rocket can only work around it today because they have systemd as PID 1 running as root doing the socket activation.

With capabilities there is no need to have privileges beyond port binding and (possibly) userid assignment, no?

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