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Linux admins a different group so I’m not going to opine authoritatively - but...
I was part of the DR group for a chunk of our business - non-Linux - many years ago.
I can tell you this though from a hiring perspective:
Server admin is $.
Networking is $$$.
DR is $$ but regularly ignored.
Security is $$$$.
K8S is ubiquitous - learning to run Maria in a container is way more valuable than learning to run Maria standalone, and we use nginx to reverse proxy there.
Everything is cloudy now though. Like you said - no one [you’d want to work for] self hosts mail/chat/ticketing/documentation/hr/payroll/sales etc etc.
Can you just throw xampp at them and tell them to go configure and run it if they want more detail?
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