I have that exact setup. Let’s suppose you want to use layzer.lan as your domain. The way I did it:
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Make a DNS record that maps *.layzer.lan to your private IP (let’s say it is 192.168.0.10). You can do this by either manually editing your local DNS resolver config file, or hosting a DNS server and adding a a new entry. I did the later, and chose AdGuard for that. Either option will make your PC underestand that going to any subdomain *.layzer.lan means going to 192.168.0.10.
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Use a reverse proxy. I use nginx-proxy-manager, and added a proxy host for each service you want to access with the link. For example, for my Immich server that is running in port 30041, I added a proxy host such that http://immich.layzer.lan/ takes you to http://192.168.0.10:30041/. Ports 80 and 443 have to be free for nginx to take. You can also add https support from here, and it’s very easy to do if you have bough a real domain.
Offtopic: I just noticed that on my Lemmy Android client you appear as laserjet, but on web you appear as layzerjeyt lol. Any idea why?
Yeap, that’s pretty much it.
Note that the link you shared has a Google’s user tracker (the part after the ?is links to your identity to create a profile of who you connect with). The clean version is https://youtu.be/qlcVx-k-02E