There are some major factual errors in this post. A few of them: > Docker has lower memory footprint, because of forcing to run only single process per contain

There are some major factual errors in this post. A few of them: > Docker has lower memory footprint, because of forcing to run only single process per container Docker doesn't force you to use a single process per container - that's a design choice that some people espouse, but not a requirement. For instance, we run the official GitLab Docker image and it consists of many processes. > Docker won't be able to run even Postfix I'm running Postfix in a Docker container right now and it's working fine. > But we are talking about Docker: it does not support IPv6 at all. IPv6 support is incomplete, but not non-existent. I'm running IPv6 in my containers right now.