My NixOS configurations for VPS

Steps to add a new server:

1. Install Nix on target host with flakes enabled, and add substituters to /etc/nix/nix.conf

2. Add a new configuration to this repo based on nixos-generate-config result on target host, with ssh and public keys configured, and adapt with preservation

3. Create /etc/NIXOS and /nixos/etc/NIXOS on target host (also copy ssh keys here to prevent step 7?)

4. Run sudo tar acvf boot.tar.gz /boot on target host, and backup boot.tar.gz locally

5. nixos-rebuild boot --flake '.#<new_server>' --target-host <new_server> --substitute-on-destination

6. Reboot target host

7. Remove target host from ~/.ssh/known_hosts, because its keys are regenerated

8. Reset root password for target host

9. Use SSH port forwarding to configure Syncthing for the first time

ssh -L 18384:127.0.0.1:8384 <new_server> -N

10. Set up Cloudflare Warp

warp-cli registration new
warp-cli mode proxy
warp-cli connect