This may be a very far-fetched idea, but here goes. I don't know much about Docker, just fiddled around with it a couple hours in a VM. Since I have to host various PHP applications with different requirements (some require 5.4, some 5.6, some 7.0), I wonder if it would be a solution in theory to host several PHP versions (e. g. several different LAMP servers) on the same physical machine using Docker.
Try LXC containers. An LXC container is much more like a virtual machine, without much overhead. It has less a learning curve than Docker.
I have some scripts for setting up my lxc containers, and maintaining them: https://github.com/tpokorra/lxc-scripts See the Readme.
Hope this is useful, Timotheus
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