Why Portability Is Not the Same Thing as Compatibility

The Container Host *is* the Container Engine, and Container Image Compatibility Matters

Have you ever wondered, how are containers are so portable? How it’s possible to run Ubuntu containers on CentOS, or Fedora containers on CoreOS? How is it that all of this just magically works? As long as I run the docker daemon on all of my hosts, everything will just work right? The answer is….no. I am here to break it to you – it’s not magic. I have said it before, and I will say it again, containers are just fancy Linux processes. There is not even a container object in the Linux kernel, there never has been. So, what does all of this mean?

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