Comment by chatmasta

Socket activation is pretty cool.

http://0pointer.de/blog/projects/socket-activated-containers...

If you're hosting a bunch of apps for clients, but not all of them are being used all the time, then you can fit more onto one server by only activating them when they're used.

I know Pantheon does this, for example. https://pantheon.io/open-source

There has also been some discussion of integrating this functionality into kubernetes: https://github.com/kubernetes/kubernetes/issues/484