First thing: get the latest Raspberry Pi OS image and verify the checksum so you’re not installing tampered firmware. Then update everything—apt‑upgrade and apt‑full‑upgrade—so you have the latest security patches. Next, limit what runs: remove or disable unused services, set the firewall (ufw) to deny all inbound except SSH on a non‑standard port. For SSH, turn off root login, use key‑based authentication, and enable Pubkey‑Authentication only. Add fail2ban to block repeated bad attempts. Change the default “pi” user password or, better, delete the user and create your own with sudo privileges. Enable unattended‑upgrades so critical patches apply automatically. If you’re running any web or IoT services, make sure they’re the minimal versions, disable unnecessary modules, and bind them to localhost if possible. Consider installing a Pi‑hole for DNS filtering to block malicious domains. Finally, lock the SD card in read‑only mode once you’ve hardened it, or use a micro‑SD with a write‑protect switch. That keeps the firmware from being altered from the inside.

Sounds good. Just remember to keep that backup image in a secure location—preferably encrypted—and keep a copy off‑site. That way, if the Pi does go sideways, you can restore without losing the hardened configuration. Good luck with the setup.

Sounds like you’ve got it covered—just keep that test routine in place until you’re sure the image boots correctly. Once everything’s verified, you can lock the SD and enjoy the peace of mind. Good luck!

Sounds solid—keep an eye on the logs after each test so you catch any quirks early. Once it’s stable, lock it and enjoy a silent, secure hub. Happy hacking!

Glad to hear it—logs are the lifeline. Happy tinkering, and keep that read‑only Pi humming.