1= Multi-host Modules2:order: 034Fleet modules configure multiple hosts simultaneously. Unlike standard NixOS modules which configure a single machine, fleet modules have access to all hosts in the cluster.56== Basic Module78[source,nix]9----1011{ config, ... }: {12 hosts = builtins.mapAttrs (name: host: {13 nixos.networking.wireguard.interfaces.wg0 = {14 ips = [ host.config.wireguardIp ];15 peers = builtins.filter (p: p.name != name)16 (builtins.attrValues config.hosts);17 };18 }) config.hosts;19}20----2122== Using Modules2324Modules are imported in the `fleetConfigurations` block:2526[source,nix]27----28fleetConfigurations.default = {29 imports = [30 ./wireguard31 ./monitoring32 ];3334 hosts.node-1 = { ... };35 hosts.node-2 = { ... };36};37----3839== Multi-instance Modules4041Modules can be parameterized and imported multiple times:4243[source,nix]44----45fleetConfigurations.default = {46 imports = [47 (import ./kubernetes { hosts = ["cp-1" "cp-2"]; })48 (import ./kubernetes { hosts = ["cp-3" "cp-4"]; })49 ];50};51----