> I think we might have different backgrounds and considerations as to what counts as 'oldschool'?
Most probably. All of the software you mentioned (maybe except Exim4) is actively used in our environments, quite a few of them are in very vanilla configs, and some of them are customized to the point of abuse. However, it's worth mentioning that all of the software you mentioned are in support roles in our scenario, they're the so-called side dish which we configure once and leave alone for a very long time.
> Maybe I shouldn't have extrapolated this to pre-2000...
I've started with a C64, please. :)
> All of these system-wide services, not user applications. And I think that's the main difference?
Yes, the tools I've talked about are userspace programs, and are not daemons 99.999% of the time. So you need to run it many times with small differences, and reconfiguring/regenerating file is a lot of work, but as I said, they all have configs and env variables are convenience overrides most of the time.
> Check out the list above on Dockerhub.
Will take a look, thanks. Wanted to learn docker in depth for a long time, but had no notable project to force me to use it. Maybe someday.