I do use one domain with several subdomains (or simply a wildcard), that’s what I meant by the CNAME record(s). But I see that wasn’t completely clear from the post.
The setup time is not really a factor, more just the overhead of one tunnel and one Traefik instance vs multiple tunnels without Traefik. I might just do some basic “benchmarking” if you can call it that to see the CPU and (more realistically) memory impact.
You say you’ve tried longer durations, but you’re only sleeping for microseconds here… I’d assume you’re simply playing the sound 30 times in 30 microseconds and as such only hear the last iteration. If you want the whole file to play every time, you could replace play_raw with play_once and use the returned Sink to simply sleep_until_end() instead of your own delay.
Edit: I just saw that you wrote that the clip played once and then quit, that doesn’t make a lot of sense (with that sleep duration, it should quit pretty much immediately). It’s been a while since I played around with Rodio and things seem to have changed a little. From quickly looking into it, I’d probably only call your play_sound function once and edit it to create a Sink in there (see the example in the documentation). You can then append an infinitely repeating source to that sink and sleep for you total desired duration.
I thought about something like that as well, but never tried it out (yet). Do you use WireGuard tunnels for that? Or something else?
Ideally I’d not expose most of the services to the public internet at all, since only me and some relatives need access to most of them. I have briefly looked into Tailscale or similar services for that, but again, haven’t tried that out yet, as that would (presumably) require changing quite a few things on both the server(s) and all of the clients…
After all, I’m just cosplaying as a sysadmin for the most part, so what do I know ;)