Changing the port seems like a pointless step, just disallow access from everywhere and allow only from select IPs. Port scanners will scan all open ports and will detect that it's ssh, regardless of port number.
this post was submitted on 11 Jul 2023
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Agreed. Security through obscurity is a fallacy.
If OP just wants to use it himself, a good idea might be to setup a VPN service and only allow the other services to be used from the VPN. That can be done with wire guard and a reverse proxy for example.
Maybe try out FreedomBox? freedombox is a Debian package which automatically sets up apache2, firewalld, fail2ban and Letʼs Encrypt. It also automatically adds pre-canned configuration files for applications you install with it (e.g. Mediawiki, WordPress, Matrix, Postfix/Dovecot). The theoretical goal of FreedomBox is to allow anyone to set up a webserver and administer it via a webUI. So, although I would say itʼs not quite there yet for command-line-illiterate users, I have found the software useful as a turnkey server to see what makes certain web applications tick, albeït in mostly vanilla form.
For example, after installing a new app like WordPress, you could examine what exactly the FreedomBox scripts changed in the /etc/apache2/ or /etc/fail2ban/ configuration files.
Your plan is solid. The important thing is that you configure those things correctly, but you’re following guides so that should be ok. It’s on a VPS so there’s no threat to your home network, and none of those services pose a significant risk to you even if they were compromised so there’s no reason to go overboard.
If I had any further advice to give it’d be:
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Change any default usernames and passwords that any of your apps/databases use.
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Use randomly generated passwords for all service accounts. So that if you do find yourself compromised, they don’t then know a password that you’ve reused somewhere else (like your email account).
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Run those services using something like Docker with no access to each other.
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Utilize your VPS provider’s cloud firewall if they have one. If you’re paying for a cheap VM, it shouldn’t need to deal with all the general firewalling from the internet. VPS providers often have free cloud firewalls you can offload that work to.
Docker is the way to go. More often than not self-hosted stuff already has docker instructions, and by design it doesn’t mount your entire drive or give access to really anything on your system unless defined explicitly, even networks are isolated iirc. OP, get educated on what docker is and what flags it has so you can easily see what has access to what before even spinning something up.