Well, I mean... Docker does provide deduplication on the same base image. So two containers created "FROM ubuntu:14.04" which are both reading from (for example

Well, I mean... Docker does provide deduplication on the same base image. So two containers created "FROM ubuntu:14.04" which are both reading from (for example) /etc/issue are using the same data. But you specifically mention across different images, and I just don't think there are enough similarities to warrant that functionality. I mean how many files are the same across CentOS 7 and Ubuntu 14.04? I just don't see the benefit that you do.