My personal feeling is that docker is a *fantastic* development tool, but it has **no place** in production.  We have a close reason that says

> Questions about development, testing and development tools may be asked
> on Stack Overflow

So on that basis I don't expect to find most docker questions on-topic for SF.  I accept that this may not be a majority viewpoint, but it's mine, and it will givern my close-voting practices in this regard.