microvm.nix CHV + tap example

flake.lock

{
  "nodes": {
    "flake-utils": {
      "inputs": {
        "systems": "systems"
      },
      "locked": {
        "lastModified": 1694529238,
        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
        "owner": "numtide",
        "repo": "flake-utils",
        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
        "type": "github"
      },
      "original": {
        "owner": "numtide",
        "repo": "flake-utils",
        "type": "github"
      }
    },
    "microvm": {
      "inputs": {
        "flake-utils": "flake-utils",
        "nixpkgs": [
          "nixpkgs"
        ]
      },
      "locked": {
        "lastModified": 1698504395,
        "narHash": "sha256-92+0zv8p0awLLigXNFHsuNBYzeOuBqMqPqLTbmHWRCA=",
        "owner": "astro",
        "repo": "microvm.nix",
        "rev": "dfe2d3db94e4829e317f97e3a095d6fd8b91f30c",
        "type": "github"
      },
      "original": {
        "owner": "astro",
        "repo": "microvm.nix",
        "type": "github"
      }
    },
    "nixpkgs": {
      "locked": {
        "lastModified": 1696375444,
        "narHash": "sha256-Sv0ICt/pXfpnFhTGYTsX6lUr1SljnuXWejYTI2ZqHa4=",
        "path": "/nix/store/h93pa4qif40f0hjwrs155ihb3lpf36m7-source",
        "rev": "81e8f48ebdecf07aab321182011b067aafc78896",
        "type": "path"
      },
      "original": {
        "id": "nixpkgs",
        "type": "indirect"
      }
    },
    "root": {
      "inputs": {
        "microvm": "microvm",
        "nixpkgs": "nixpkgs"
      }
    },
    "systems": {
      "locked": {
        "lastModified": 1681028828,
        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
        "owner": "nix-systems",
        "repo": "default",
        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
        "type": "github"
      },
      "original": {
        "owner": "nix-systems",
        "repo": "default",
        "type": "github"
      }
    }
  },
  "root": "root",
  "version": 7
}

flake.nix

{
  description = "NixOS in MicroVMs";

  inputs.microvm.url = "github:astro/microvm.nix";
  inputs.microvm.inputs.nixpkgs.follows = "nixpkgs";

  outputs = { self, nixpkgs, microvm }:
    let
      system = "x86_64-linux";
    in {
      defaultPackage.${system} = self.packages.${system}.my-microvm;

      packages.${system} = {
        # To run:
        # > sudo ip tuntap add mode tap user $USER name vm-chv
        # > sudo ip l s vm-chv up
        # > nix run .#my-microvm
        my-microvm = self.nixosConfigurations.my-microvm.config.microvm.declaredRunner;
      };

      nixosConfigurations = {
        my-microvm = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [
            microvm.nixosModules.microvm
            {
              networking.hostName = "my-microvm";
              users.users.root.password = "";
              services.openssh = {
                enable = true;
                settings.PermitRootLogin = "yes";
              };
              microvm = {
                hypervisor = "cloud-hypervisor";
                socket = "control.socket";
                interfaces = [ {
                  type = "tap";
                  id = "vm-chv";
                  mac = "00:00:00:00:00:01";
                } ];
              };
            }
          ];
        };
      };
    };
}