I think its vastly more useful to think of a container as an RPM with layered tarballs, a chroot/jail, and some cgroup isolation.
Thinking of them as a virtual machine is the wrong metaphor.
Kubernetes replaces the thing we were doing in 2003 blasting around tarballs of software with scp and some scripts to start and stop things, and is the end result of evolving from that point to a much more dynamic one and with cgroups providing the ability to have software teams not quite clobber each other's workloads while running on the same hardware.
The problems it solves overlaps with many of the problems that VMs were addressing, but it is like looking at two different species that look quite similar but are in completely different animal families and are just similar because of the similar environment they evolved in.
I think its vastly more useful to think of a container as an RPM with layered tarballs, a chroot/jail, and some cgroup isolation.
Thinking of them as a virtual machine is the wrong metaphor.
Kubernetes replaces the thing we were doing in 2003 blasting around tarballs of software with scp and some scripts to start and stop things, and is the end result of evolving from that point to a much more dynamic one and with cgroups providing the ability to have software teams not quite clobber each other's workloads while running on the same hardware.
The problems it solves overlaps with many of the problems that VMs were addressing, but it is like looking at two different species that look quite similar but are in completely different animal families and are just similar because of the similar environment they evolved in.