Either hosting, or externalized System administration, or other...

https://www.netmeister.org/blog/defi...perations.html
https://duckduckgo.com/?q=Either+hos...=b&t=hc&ia=web
https://medium.com/publishous/why-ke...l-5c66913fcd3c
Opinion: go for it?

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Happy to answer that, as soon as you can tell me "how high is up?"

What do you think anyone will be able to tell you? You give several options, which aren't alike, don't tell us your level of knowledge, experience, financial situation, professional contacts, etc. There are endless OPPORTUNITIES...whether you have the knowledge and drive to take advantage of them is something no one here can answer.

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It looks like I won't escape getting a job first and do this in my spare time...

Currently, I'm PhDing but in electronics. So financial situation is zero, and professional contact too. Maybe help schools to install their Network when they don't have one, or small companies alike

Honestly, if you don't work in the field, it is *HIGHLY UNLIKELY* you will get much (if any) work in your spare time. Because....
...you don't have a degree/experience in the topic at hand. If you were a school or a small company, are you going to hire someone who does it part-time, or someone who's done it for years and has references as to their work?

If you want to work as an admin, get an entry level job and get experience and knowledge, and build on it.

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if you have no idea better to not start ....
Anyway, it looks like you need to learn a lot.

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It seems the most reasonable option, unfortunately
Was trying to avoid the CV spreading and suit interviewing process

Well along with the title, I guess it becomes a full sentence. But some of your other posts raise some flags.I'm aghast here at the verbiage. I've worked with numerous PhD candidates and recipients and I daresay none of them have used the term as a verb. In fact, one strong characteristic of all those persons is that they convey their thoughts, feedback, and ideas with great clarity. Next the financial situation, well understood. I would say that numerous PhD candidates usually end up with various forms of funding for their research and typically are contacted very much to be part of research projects so that the institutions name as well as the fact that a person of this level of knowledge is involved in their projects. If you're just starting with your studies, I'd suggest you persevere a bit and I believe very soon you will be involved with a great deal of professional contacts, to the point where you'll adapt a filtering method to disqualify any contact attempts which would be a poor use of your time. Similarly I feel funding will likely ensue once you progress along towards your dissertation.Suggestion is to not casually dismiss this and try to act as a popular person. Meaning: Categorizing the acts involved with researching for, searching for, and negotiating a job. These actions and qualities used in them are the same ones you'll use to convey your ideas to persons you wish to gain funding from, or convince to associate with you/employ you, so that you may conduct the continued research in your field of interest.

If you're solely studying in a PhD program to "make money", then I can't help you. I feel that you may eventually find it was not your best focus, or you may succeed, there are plenty of varieties as to how things occur. The only sound advice I can offer is to only study if you believe in the field you've chosen to study and want to actually work in that field or contribute knowledge towards that field of study. Otherwise I'd suggest you consider studying business management and choosing a focus within that field of study, related to entrepreneurial considerations.

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Sorry...unfortunately?? This makes it sound like you think having a job is somehow beneath you.
As someone who has built a business over the course of many years, how exactly do you think things work? Do you think you call someone and say, "I want to set up your network", and they just agree and hand you a bag of money?

You 'interview' and prove yourself every single day, with every single job. If you can't sell yourself and your skill set to a company for an entry-level position, how do you think you're going to sell business? If you can't work as part of a team, learn from people, take advice and criticism, and build your skill-set, you will absolutely fail at everything you do, in any field you choose...that is a guarantee.

::EDIT::
This post
https://www.linuxquestions.org/quest...ge-4175690942/

..is a great example of what rtmistler was talking about. You were asked a simple question but did not answer it. You have a myriad of diagnostic tools available to you, with a LOT of how-to guides you could access with a brief Internet search, along with thousands of bash scripting guides. If you start a business, is your plan to post every question/problem to a forum, and wait for an answer?

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Running a business was a wrong idea...

The main thing is advertising?

Seriously??? You come back to this thread after a year, and that's your main take-away?? To advertise???

Did you miss the parts about getting experience, learning and doing research, and learning how to run a business?? As rtmistler rightly said, a PhD candidate should be able to articulate things in a better manner, and be able to demonstrate they've learned from things. Go back, re-read EVERYTHING in this thread, then ask yourself if your last post is what you should have learned.

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Actually, I believe that was a response to another post which has been removed as spam, not the OP's conclusion.

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Yes, there had been a post that I was answering to... Apologies for unearthing this post too. Besides, I followed your advice and found a sysadmin job

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They are spammers, that's what they do. Reposting that spam link/post isn't going to get much, since it's been reported.