{
  description = "Alo cluster";

  inputs = {
    deploy-rs.url = "github:serokell/deploy-rs";
    deploy-rs.inputs.nixpkgs.follows = "nixpkgs";
    impermanence.url = "github:nix-community/impermanence";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
  };

  outputs = { self, nixpkgs, nixpkgs-unstable, deploy-rs, ... }@inputs:
    let
      inherit (self);

      overlay-unstable = final: prev: {
        unstable = nixpkgs-unstable.legacyPackages.${prev.system};
      };

      mkNixos = system: modules: nixpkgs.lib.nixosSystem {
        system = system;
        modules = [
          ({ config, pkgs, ... }: {
             nixpkgs.overlays = [ overlay-unstable ];
             nixpkgs.config.allowUnfree = true;
           })
        ] ++ modules;
        specialArgs = { inherit inputs self; };
      };
    in {
      nixosConfigurations = {
        c1 = mkNixos "x86_64-linux" [ ./hosts/c1 ];
        c2 = mkNixos "x86_64-linux" [ ./hosts/c2 ];
        c3 = mkNixos "x86_64-linux" [ ./hosts/c3 ];
        nix-dev = mkNixos "x86_64-linux" [ ./hosts/nix-dev ];
        alo-cloud-1 = mkNixos "aarch64-linux" [./hosts/alo-cloud-1 ];
        zippy = mkNixos "x86_64-linux" [ ./hosts/zippy ];
      };

      deploy = {
        nodes = {
          c1 = {
            hostname = "c1";
            profiles.system = {
              user = "root";
              path = deploy-rs.lib.x86_64-linux.activate.nixos self.nixosConfigurations.c1;
            };
          };
          c2 = {
            hostname = "c2";
            profiles.system = {
              user = "root";
              path = deploy-rs.lib.x86_64-linux.activate.nixos self.nixosConfigurations.c2;
            };
          };
          c3 = {
            hostname = "c3";
            profiles.system = {
              user = "root";
              path = deploy-rs.lib.x86_64-linux.activate.nixos self.nixosConfigurations.c3;
            };
          };
          nix-dev = {
            hostname = "nix-dev";
            profiles.system = {
              user = "root";
              path = deploy-rs.lib.x86_64-linux.activate.nixos self.nixosConfigurations.nix-dev;
            };
          };
          alo-cloud-1 = {
            hostname = "49.13.163.72";
            profiles.system = {
              user = "root";
              path = deploy-rs.lib.aarch64-linux.activate.nixos self.nixosConfigurations.alo-cloud-1;
            };
          };
          zippy = {
            hostname = "zippy";
            profiles.system = {
              user = "root";
              path = deploy-rs.lib.x86_64-linux.activate.nixos self.nixosConfigurations.zippy;
            };
          };
        };
      };

      checks = builtins.mapAttrs (system: deployLib: deployLib.deployChecks self.deploy) deploy-rs.lib;
    };
}