Enable prometheus node exporter by default

nixos/machines/ghatanothoa/configuration.nix

@@ -0,0 +1,19 @@
+flake-inputs:
+{config, pkgs, lib, ... }: {
+
+imports = [
+  ./hardware-configuration.nix
+  ../../modules/jitsi.nix
+  ../../roles
+  ./network.nix
+];
+
+  services.mathebau-jitsi = {
+    enable = true;
+    hostName = "meet.mathebau.de";
+  };
+
+# System configuration here
+  networking.hostName = "ghatanothoa";
+  system.stateVersion = "23.11";
+}

nixos/machines/ghatanothoa/hardware-configuration.nix

@@ -0,0 +1,31 @@
+{config, lib, pkgs, modulesPath, ...}: {
+  imports = [ ];
+
+  fileSystems."/" = {
+    device = "gha-root";
+    fsType = "tmpfs";
+    options = [ "size=1G" "mode=755" ];
+  };
+  fileSystems."/persist" = {
+    device = "/dev/disk/by-uuid/e0a160ef-7d46-4705-9152-a6b602898136";
+    fsType = "btrfs";
+    options = [ "subvol=persist" ];
+    neededForBoot = true;
+  };
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/19da7f3a-69da-4fa8-bb68-b355d7697ba7";
+    fsType = "ext4";
+  };
+  fileSystems."/nix" = {
+    device = "/dev/disk/by-uuid/e0a160ef-7d46-4705-9152-a6b602898136";
+    fsType = "btrfs";
+    options = [ "subvol=nix" ];
+  };
+
+  swapDevices =
+    [{ device = "/dev/disk/by-uuid/e6e3ba6b-c9f5-4960-b56d-f49760d76a4a"; }];
+
+  nix.settings.max-jobs = lib.mkDefault 4;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}

nixos/machines/ghatanothoa/network.nix

@@ -0,0 +1,15 @@
+# We sohuld put that config somewhere in roles and give it a parameter or something,
+# everyone gets the same nameserver and the same prefixLength and address vs defaultGateway alsways
+# depend on the same thing 
+{
+  imports = [ ];
+  networking = {
+    interfaces.enX0.ipv4.addresses = [ {
+      address = "192.168.0.25";
+      prefixLength = 16;
+    } ];
+    defaultGateway = "192.168.0.152";
+    nameservers = ["130.83.2.22" "130.83.56.60" "130.83.22.60" "130.82.22.63"];
+  };
+}
+

nixos/modules/jitsi.nix

@@ -0,0 +1,55 @@
+{pkgs, config, lib, modulesPath, ...}:
+let 
+  inherit (lib)
+    mkIf
+    mkEnableOption
+    mkOption
+    head;
+  inherit (lib.types) str;
+  cfg = config.services.mathebau-jitsi;
+in
+{
+  imports = [(modulesPath + "/services/web-apps/jitsi-meet.nix")];
+  
+  options.services.mathebau-jitsi = {
+    enable = mkEnableOption "mathebau jitsi service";
+    hostName = mkOption {
+      type = str;
+    };
+    localAddress = mkOption {
+      type = str;
+      default = (head config.networking.interfaces.enX0.ipv4.addresses).address;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.jitsi-meet = {
+      enable = true;
+      hostName = cfg.hostName;
+      config = {
+        defaultLang = "de";
+      };
+    };
+    services.jitsi-videobridge = {
+      openFirewall = true;
+      nat = {
+        publicAddress = "130.83.2.184";
+        localAddress = cfg.localAddress;
+      };
+    };
+    environment.persistence.${config.impermanence.name} = {
+      directories = [
+        "/var/lib/jitsi-meet"
+        "/var/lib/prosody"
+      ];
+    };
+  #We are behind a reverse proxy that handles TLS
+    services.nginx.virtualHosts."${cfg.hostName}" = {
+      enableACME = false;
+      forceSSL = false;
+    };
+
+  #The network ports for HTTP(S) are not opened automatically
+    networking.firewall.allowedTCPPorts = [ 80 443 ];
+  };
+}

nixos/roles/default.nix

@@ -55,5 +55,12 @@ services = {
       PasswordAuthentication = false;
     };
   };
+  
+  prometheus.exporters.node = {
+    enable = true;
+    port = 9100;
+  };
 };
+# Prometheus Monitoring
+networking.firewall.allowedTCPPorts = [ 9100 ];
 }