Some changes were required to set 3 VMs as the cluster since the NUC failed and we are waiting for new hardware to arrive. The ingest routing from the internet was changed to use cloudflared tunnel to traefik instead of via a specific host.
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Follow steps at https://nixos.org/manual/nixos/stable/#sec-installation-manual-summary
Note: run lsblk to determine correct device to install to.
Set the hostname when editing /mnt/etc/nixos/configuration.nix before the installation:
networking.hostName = "jaglan-beta-mNN";
Once nixos-install is complete and the root password is set and saved edit the (/mnt)/etc/nixos/configuration.nix again to enable ssh and run nixos-rebuild switch
services.openssh.enable = true;
services.openssh.settings.PermitRootLogin = "yes";
Upgrade the OS
nix-channel --list
nix-channel --add https://channels.nixos.org/nixos-25.05 nixos
nix-channel --list
nixos-rebuild switch --upgrade