What I argued in my paper is that systems like docker (i.e. what I created before it), improve over VMs and (even Zones/ZFS) in their ability to really run ephemeral computation. i.e. if it takes microseconds to setup the container file system, you can run a boatload of heterogeneous containers even if they only needed to run for very shot periods of time). Solaris Zones/ZFS didn't lend itself to heterogeneous environments, but simply cloning as single homogeneous environment, while VMs suffered from that problem, they also (at least at the time, much improved as of late) required a reasonably long bootup time.

New enough kernel means CentOS 5 is right out. But it's been a decade, it'll run on anything vaguely sensible to be running today