I've been struggling with fully understanding containers. This article helps but it's a little too low level for me. A quick question for HN'ers: If you've got

I've been struggling with fully understanding containers. This article helps but it's a little too low level for me. A quick question for HN'ers: If you've got a machine running say 4 docker instances, does it help resource usage if all instances are running the same Linux distro? Or, since the kernel is the only thing shared between them does it even matter?