So with overlayfs, if I have 1000 containers each with their own upper layer mounted separately on top of the same lower layer, and each one of them runs the same copy of apache, will the linux MM system share most of the memory for those apache executables, as much as if they all ran off of the same file in the lower layer directly?
If so, this will be a major boon for "virtualisation" on linux, extremely memory efficient and lightweight containers. This would allow linux containers in the mainline to share some of the ideas and similar benefits to the linux vserver project's "unification".
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