Install NixOS on Hetzner Cloud

Note: This article is about installing NixOS on Hetzner Cloud, which provides VPS cloud servers. It is not to be confused with Hetzner Online, which provides dedicated bare-metal servers.

Network configuration

The public IPv4 address of the server will be automatically obtained by NixOS via DHCP, no extra configuration needed. For IPv6 you have to assign the network address and gateway manually like this:

networking = {
  interfaces.ens3.ipv6.addresses = [{
    address = "2a01:4f8:....:....::";
    prefixLength = 64;
  }];
  defaultGateway6 = {
    address = "fe80::1";
    interface = "ens3";
  };
};

Replace the address part with the correct IPv6 address of your instance. You can find it on the Hetzner Cloud Console by selecting the respective server and navigation to the "Networking" section in the left menu.