alt Hacker NewsIt's a different operating system. You can't point at a dockerfile, say "port this please from linux-such-and-such to FreeBSD" and expect it to work every time. There are nuances even with linux-compat.
Contrary to popular belief load-balance/scaleout is orthogonal to containers (and k8s is only one of the ways to go about it), so obviously it's not discussed in an article about containers.
Very often you can, or could, because the software is portable (e.g. Node or Python or Postgres), and / or platform-independent (e.g. written in JS, Python, bash, etc).
In my practice it was completely normal to build things inside a container to be deployed on Linux using the same sources and basically the same package names and versions as used on a developer macOS machine (which is BSD-like enough down below).