hetzner_benchmark: document installer

README.md

@@ -53,6 +53,30 @@ The `(modulesPath + "/installer/sd-card/sd-image-aarch64.nix")` allows this.
 
 - profit
 
+## Hetzner, nixos-anywhere
+References:
+- <https://github.com/nix-community/nixos-anywhere/blob/main/docs/quickstart.md>
+- <https://wiki.nixos.org/wiki/Install_NixOS_on_Hetzner_Cloud>
+
+I haven't figured out how to use raid on this machine, as it failed half-way
+through the installer when I used the raid configuration.
+
+### Pitfalls
+- nixos-anywhere will wipe the disk, even if you use the flag `--generate-hardware-config`.
+
+- The command is quite long and isn't non-flake friendly.
+  Note that the diskoScript has to come before toplevel derivation.
+  Read more on the order <https://github.com/nix-community/nixos-anywhere/issues/597>.
+  ```fish
+  nixos-anywhere \
+      --generate-hardware-config nixos-generate-config ./hardware-configuration.nix \
+      -i <ssh_identity> \
+      --store-paths $(nix-build --no-out-link \
+          -A nixosConfigurations.hetzner_benchmark.config.system.build.diskoScript \
+          -A nixosConfigurations.hetzner_benchmark.config.system.build.toplevel) \
+      <user>@<host>
+  ```
+
 # Pitfalls
 ## `users.mutableUsers`
 NEVER set this to true without declaratively setting the passwords.