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We use a small drink kiosk touch pad powered by Rasperry Pi, using this simple software project: https://github.com/rwth-i6/drink-kiosk
Works great. Except the SD card seems to be dying now after 3 years of constant usage (well, less usage during the enforced home-office times).
Indeed. One actually useful case I found was using an rpi with shairport-sync + owntone to allow airplay streaming. I got a quality DAC from hifiberry [0].
Another use was running HomeAssistant, but I migrated that to my real server.
Another use is having an external InfluxDB + Grafana monitoring setup so I can view stats even if the server goes down.
Lastly, you can take X amount of raspberry pis and run a kubernetes cluster with k3s. [1]
0: https://www.hifiberry.com/
1: https://k3s.io/
I like wg-netns. It allows setup of a wireguard tunnel, similar to wg-quick does, in a Linux network namespace. So I can run some processes using the VPN, and others without.
By specifying the namespace in a systemd service file, I can let a service use a specific VPN.
https://github.com/dadevel/wg-netns
If you still haven't found a use for them: they make for good low-power, always-on, headless networked servers for processing-light tasks.
Other commentators mentioned pihole/DNS, WireGuard, and music streaming, but you can also use them for a (slow) NFS server, persistent Syncthing node, Maestral host[1] (third-party Dropbox client written in Python (that can actually run on the Raspberry Pi, unlike the official Dropbox client)), or device that maintains a connection to a distributed network (e.g. Hyporborea/cjdns).
[1] https://github.com/SamSchott/maestral
You can set up a Pi-Hole (DNS sinkhole) and Pi-VPN (Wireguard installer and CLI-frontend for small deployments) very quickly. And you can do it on any debian VM or computer, not just Pi.
Once you have the base OS ready to go, it will take you less than 30 minutes if you know how to muck with your DHCP/firewall settings in your router.
https://github.com/pi-hole/pi-hole/#one-step-automated-insta...
https://pivpn.io/
You can set up a Pi-Hole (DNS sinkhole) and Pi-VPN (Wireguard installer and CLI-frontend for small deployments) very quickly. And you can do it on any debian VM or computer, not just Pi.
Once you have the base OS ready to go, it will take you less than 30 minutes if you know how to muck with your DHCP/firewall settings in your router.
https://github.com/pi-hole/pi-hole/#one-step-automated-insta...
https://pivpn.io/
https://github.com/DNSCrypt/dnscrypt-proxy/wiki/Configuratio...
>minisign_key is a public key, used to verify that the content is legitimate. Lists can thus be served from any location, even from an untrusted ISP: dnscrypt-proxy will immediately detect and reject something that has been tampered with.