[garthk]

… which is one of the pressures driving Docker adoption. Each process tree gets its own root filesystem to trash with its multitude of dependencies. DLL hell, shared library hell, JDK hell, Ruby and Python environment hell… a lot of it can be summed up as "userland hell". Docker makes it easy to give the process its own bloody userland and be done with it.

[deong]

I think this falls under the heading of "I'm old", but I already have one machine to maintain. Replacing it with N machines to maintain doesn't feel like a win to me.