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Sounds like it might've been this article?

https://jpetazzo.github.io/2017/02/24/from-dotcloud-to-docke...?

Oh yeah, I read that - surrounding the original authors at dotCloud about their experiences trying to do it in multiple processes IIRC. That said, it seems the problem may be somewhat solved at this point.

The reason boiled down to "it's easier to write a daemon to handle it all". But it's definitely not better than the alternative, nor is the alternative impossible.