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I would reconsider docker because if a specific application leaks some sort of shell access or system file access you’ll be protected out side of container host escalation.
Unrelated to security, I prefer docker because it leaves the server very clean if you remove different apps. Can also save time configuring more complex applications or applications that conflict with system libraries.
Add fail2ban on your list of applications it watches logs for invalid logins and puts them on firewall block rules after so many failed attempts.
I was annoyed that the one time I wanted to use 418 as a filler Dotnets http library didn’t support returning it.