Great article and nice style distilling all this into a bite size chunks.

Is it me or just the title is a little bit inaccurate in the sense that there's more to "How containers work?" than overlays, e.g. it made me think that it covers more than it actually does, e.g. cgroups, namespaces, etc...

Anyone knows of a more in depth coverage of containers building block type of article that allows one to build a rudimentary container from scratch to appreciate what goes into building one ?