{
  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-23.05";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
  };

  outputs = { self, nixpkgs, nixpkgs-unstable, deploy-rs, ... }@inputs:
    let
      inherit (self);
      system = "x86_64-linux";

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

      mkNixos = modules: nixpkgs.lib.nixosSystem {
        modules = [
          ({ config, pkgs, ... }: { nixpkgs.overlays = [ overlay-unstable ]; })
        ] ++ modules;
        specialArgs = { inherit inputs self; };
      };
    in {
      nixosConfigurations = {
        c1 = mkNixos [ ./hosts/c1 ];
        c2 = mkNixos [ ./hosts/c2 ];
        c3 = mkNixos [ ./hosts/c3 ];
        nix-dev = mkNixos [ ./hosts/nix-dev ];
      };

      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;
            };
          };
        };
      };

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