losttourist

It’s a little more than 100€

It’s half as much again! If your budget is that flexible you really should have mentioned it in the original post so that people could give you a wider range of options.

Translate it up by a couple of orders of magnitude and you get “I want to buy a car, I have €10,000 to spend” … “I found one for €15,000, it’s a little bit more but …”

Yes, I think that ‘masquerading’ is the key bit to grasp. The MITM Proxy isn’t just intercepting the traffic, it alters the traffic as it passes through.

DigitalOcean’s guides in general are pretty good for all sorts of things, whether it’s a generic discussion of a concept like the ones you’ve posted, or a step-by-step guide for installing and configuring specific systems or software. Even if you’re not using DO as a host, much of what they suggest is still very useful.

systemd [is] a niche

Maybe in the wider world of all the operating systems installed on all the computers, but for Linux-based computing it is, like it or not, near ubiquitous these days. And in particular for server systems (and this is, after all, /m/selfhosted), good luck finding something that isn’t systemd-based unless you’re deliberately choosing a BSD or aiming for a system which has ever-decreasing amounts of support available.

what if I’m not using CoreOS?

Podman runs on any distro (or more strictly: any distro that uses systemd). It’s essentially a FOSS alternative to Docker.