diff --git a/configs/sterni/configuration.nix b/configs/sterni/configuration.nix
index d298ccc..67b8b54 100644
--- a/configs/sterni/configuration.nix
+++ b/configs/sterni/configuration.nix
@@ -66,7 +66,17 @@
 
   # enable this to use sidequest
   programs.adb.enable = true;
-  users.users.mainUser.extraGroups = [ "adbusers" ];
+  users.users.mainUser.extraGroups = [ "adbusers" "video" ];
+
+  # for congress and streaming
+  hardware.opengl = {
+    enable = true;
+    extraPackages = [ pkgs.vaapiIntel ];
+    driSupport32Bit = true;
+  };
+  nixpkgs.config.packageOverrides = pkgs: {
+    vaapiIntel = pkgs.vaapiIntel.override { enableHybridCodec = true; };
+  };
 
 }
 
diff --git a/terranix/jitsi-cloud/.gitignore b/terranix/jitsi-cloud/.gitignore
new file mode 100644
index 0000000..6073c1a
--- /dev/null
+++ b/terranix/jitsi-cloud/.gitignore
@@ -0,0 +1,2 @@
+plops/generated/
+sshkey*
\ No newline at end of file
diff --git a/terranix/jitsi-cloud/README.md b/terranix/jitsi-cloud/README.md
new file mode 100644
index 0000000..40dfe49
--- /dev/null
+++ b/terranix/jitsi-cloud/README.md
@@ -0,0 +1,45 @@
+# NixOS Server Example with plops
+
+This setup shows:
+
+* how to use a terranix module
+* how to use 3rd party provision software after terraform.
+* how to run terranix and terraform
+
+Setup containing opinionated modules to deploy
+[NixOS servers](https://nixos.org/)
+on
+[hcloud](https://www.hetzner.com/cloud)
+using
+[nixos-infect](https://github.com/elitak/nixos-infect)
+with my
+[plops](https://github.com/mrVanDalo/plops)
+provisioning tool for NixOS,
+which is an overlay on 
+[krops](https://cgit.krebsco.de/krops/about/).
+
+After server creation,
+the initial provisioning uploads the
+nixos-infect
+script and applys it.
+After server creation and initialization
+terranix/terraform generates
+files used for the "real" provisioning
+done by plops.
+
+Of course instead of plops you can use every provsioning tool you like
+here (e.g. NixOps, Ansible, ... )
+
+# How to Run
+
+## What you need
+
+* a setup [passwordstore](https://www.passwordstore.org/).
+* a [hcloud token](https://docs.hetzner.cloud/#overview-getting-started) 
+  stored under `development/hetzner.com/api-token`
+
+## Steps
+
+* `example-prepare`: to create ssh keys.
+* `example-ssh`: to run terranix and terraform do create server.
+* `example-cleanup`: to delete server, ssh keys and terraform data. (don't forget that step, or else it gets costly)
diff --git a/terranix/jitsi-cloud/config.nix b/terranix/jitsi-cloud/config.nix
new file mode 100644
index 0000000..a7a075e
--- /dev/null
+++ b/terranix/jitsi-cloud/config.nix
@@ -0,0 +1,47 @@
+{ config, lib, pkgs, ... }:
+let
+  hcloud-modules = pkgs.fetchgit {
+    url = "https://github.com/mrVanDalo/terranix-hcloud.git";
+    rev = "5fa359a482892cd973dcc6ecfc607f4709f24495";
+    sha256 = "0smgmdiklj98y71fmcdjsqjq8l41i66hs8msc7k4m9dpkphqk86p";
+  };
+in {
+
+  imports = [ "${hcloud-modules}/default.nix" ];
+
+  # configure admin ssh keys
+  users.admins.palo.publicKey = "${lib.fileContents ./sshkey.pub}";
+
+  # configure provisioning private Key to be used when running provisioning on the machines
+  provisioner.privateKeyFile = toString ./sshkey;
+
+  hcloud.nixserver = {
+    host = {
+      enable = true;
+      serverType = "cx51"; # 35€/month
+      configurationFile = pkgs.writeText "configuration.nix" ''
+        { pkgs, lib, config, ... }:
+        {
+          environment.systemPackages = [ pkgs.git ];
+        }
+      '';
+    };
+  };
+
+  hcloud.export.nix = toString ./plops/generated/nixos-machines.nix;
+
+  resource.local_file.sshConfig = {
+    filename = "${toString ./plops/generated/ssh-configuration}";
+    content = with lib;
+      let
+        configPart = name: ''
+          Host ''${ hcloud_server.nixserver-${name}.ipv4_address }
+          IdentityFile ${toString ./sshkey}
+          ServerAliveInterval 60
+          ServerAliveCountMax 3
+        '';
+      in concatStringsSep "\n"
+      (map configPart (attrNames config.hcloud.nixserver));
+  };
+
+}
diff --git a/terranix/jitsi-cloud/plops/configs/nixserver-host/configuration.nix b/terranix/jitsi-cloud/plops/configs/nixserver-host/configuration.nix
new file mode 100644
index 0000000..d912c06
--- /dev/null
+++ b/terranix/jitsi-cloud/plops/configs/nixserver-host/configuration.nix
@@ -0,0 +1,79 @@
+{ config, pkgs, lib, ... }: {
+  imports = [ ./hardware-configuration.nix ];
+
+  services.sshd.enable = true;
+
+  environment.systemPackages = [ pkgs.git ];
+
+  networking.hostName = "host";
+
+  security.acme.email = "contact@ingolf-wagner.de";
+  security.acme.acceptTerms = true;
+
+  # the public ssh key used at deployment
+  users.users.root.openssh.authorizedKeys.keys = [
+    "ssh-rsa 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"
+  ];
+
+  #               +                                       +
+  #               |                                       |
+  #               |                                       |
+  #               v                                       v
+  #          80, 443 TCP                          443 TCP, 10000 UDP
+  #       +--------------+                     +---------------------+
+  #       |  nginx       |  5222, 5347 TCP     |                     |
+  #       |  jitsi-meet  |<-------------------+|  jitsi-videobridge  |
+  #       |  prosody     |         |           |                     |
+  #       |  jicofo      |         |           +---------------------+
+  #       +--------------+         |
+  #                                |           +---------------------+
+  #                                |           |                     |
+  #                                +----------+|  jitsi-videobridge  |
+  #                                |           |                     |
+  #                                |           +---------------------+
+  #                                |
+  #                                |           +---------------------+
+  #                                |           |                     |
+  #                                +----------+|  jitsi-videobridge  |
+  #                                            |                     |
+  #                                            +---------------------+
+
+  # This is a one server setup
+  services.jitsi-meet = {
+    enable = true;
+    hostName = "meet.palovandalo.com";
+
+    # JItsi COnference FOcus is a server side focus component used in Jitsi Meet conferences.
+    # https://github.com/jitsi/jicofo
+    jicofo.enable = true;
+
+    # Whether to enable nginx virtual host that will serve the javascript application and act as a proxy for the XMPP server.
+    #  Further nginx configuration can be done by adapting services.nginx.virtualHosts.<hostName>. When this is enabled, ACME
+    #  will be used to retrieve a TLS certificate by default. To disable this, set the
+    #  services.nginx.virtualHosts.<hostName>.enableACME to false and if appropriate do the same for
+    #  services.nginx.virtualHosts.<hostName>.forceSSL.
+    nginx.enable = true;
+
+    # https://github.com/jitsi/jitsi-meet/blob/master/config.js
+    config = {
+      enableWelcomePage = false;
+      defaultLang = "en";
+
+    };
+
+    # https://github.com/jitsi/jitsi-meet/blob/master/interface_config.js
+    interfaceConfig = {
+      SHOW_JITSI_WATERMARK = false;
+      SHOW_WATERMARK_FOR_GUESTS = false;
+    };
+
+  };
+
+  # todo : ssh nur mit ssh key machen 
+
+  networking.firewall = {
+    allowedTCPPorts = [ 80 443 ];
+    allowedUDPPorts = [ 10000 ];
+  };
+
+}
diff --git a/terranix/jitsi-cloud/plops/configs/nixserver-host/hardware-configuration.nix b/terranix/jitsi-cloud/plops/configs/nixserver-host/hardware-configuration.nix
new file mode 100644
index 0000000..ae82a10
--- /dev/null
+++ b/terranix/jitsi-cloud/plops/configs/nixserver-host/hardware-configuration.nix
@@ -0,0 +1,10 @@
+{ ... }: {
+  imports = [ <nixpkgs/nixos/modules/profiles/qemu-guest.nix> ];
+  boot.initrd.availableKernelModules =
+    [ "ata_piix" "uhci_hcd" "virtio_pci" "sd_mod" "sr_mod" ];
+  boot.loader.grub.device = "/dev/sda";
+  fileSystems."/" = {
+    device = "/dev/sda1";
+    fsType = "ext4";
+  };
+}
diff --git a/terranix/jitsi-cloud/plops/shell.nix b/terranix/jitsi-cloud/plops/shell.nix
new file mode 100644
index 0000000..22a6f94
--- /dev/null
+++ b/terranix/jitsi-cloud/plops/shell.nix
@@ -0,0 +1,71 @@
+let
+
+  # import plops with pkgs and lib
+  opsImport = import ((import <nixpkgs> { }).fetchgit {
+    url = "https://github.com/mrVanDalo/plops.git";
+    rev = "9fabba016a3553ae6e13d5d17d279c4de2eb00ad";
+    sha256 = "193pajq1gcd9jyd12nii06q1sf49xdhbjbfqk3lcq83s0miqfs63";
+  });
+
+  ops = let
+    overlay = self: super: {
+      # overwrite ssh to use the generated ssh configuration
+      openssh = super.writeShellScriptBin "ssh" ''
+        ${super.openssh}/bin/ssh -F ${
+          toString ./generated/ssh-configuration
+        } "$@"
+      '';
+    };
+  in opsImport { overlays = [ overlay ]; };
+
+  lib = ops.lib;
+  pkgs = ops.pkgs;
+
+  # define all sources
+  source = {
+
+    # nixpkgs (no need for channels anymore)
+    nixPkgs.nixpkgs.git = {
+      ref = "nixos-20.09";
+      url = "https://github.com/NixOS/nixpkgs";
+    };
+
+    # system configurations
+    system = name: {
+      configs.file = toString ./configs;
+      nixos-config.symlink = "configs/${name}/configuration.nix";
+    };
+
+    # secrets which are hold and stored by pass
+    secrets = name: {
+      secrets.pass = {
+        dir = toString ./secrets;
+        name = name;
+      };
+    };
+  };
+
+  servers = import ./generated/nixos-machines.nix;
+
+  deployServer = name:
+    { user ? "root", host, ... }:
+    with ops;
+    jobs "deploy-${name}" "${user}@${host.ipv4}" [
+      # deploy secrets to /run/plops-secrets/secrets
+      # (populateTmpfs (source.secrets name))
+      # deploy system to /var/src/system
+      (populate (source.system name))
+      # deploy nixpkgs to /var/src/nixpkgs
+      (populate source.nixPkgs)
+      switch
+    ];
+
+in pkgs.mkShell {
+
+  buildInputs = lib.mapAttrsToList deployServer servers;
+
+  shellHook = ''
+    export PASSWORD_STORE_DIR=./secrets
+  '';
+
+}
diff --git a/terranix/jitsi-cloud/shell.nix b/terranix/jitsi-cloud/shell.nix
new file mode 100644
index 0000000..a934fa1
--- /dev/null
+++ b/terranix/jitsi-cloud/shell.nix
@@ -0,0 +1,44 @@
+{ pkgs ? import <nixpkgs> { } }:
+let
+
+  terranix = pkgs.callPackage (pkgs.fetchgit {
+    url = "https://github.com/mrVanDalo/terranix.git";
+    rev = "2.3.0";
+    sha256 = "030067h3gjc02llaa7rx5iml0ikvw6szadm0nrss2sqzshsfimm4";
+  }) { };
+
+  terraform = pkgs.writers.writeBashBin "terraform" ''
+    export TF_VAR_hcloud_api_token=`${pkgs.pass}/bin/pass development/hetzner.com/api-token`
+    ${pkgs.terraform_0_12}/bin/terraform "$@"
+  '';
+
+in pkgs.mkShell {
+
+  buildInputs = [
+
+    terranix
+    terraform
+
+    (pkgs.writers.writeBashBin "example-prepare" ''
+      ${pkgs.openssh}/bin/ssh-keygen -P "" -f ${toString ./.}/sshkey
+    '')
+
+    (pkgs.writers.writeBashBin "example-run" ''
+      set -e
+      set -o pipefail
+      ${terranix}/bin/terranix | ${pkgs.jq}/bin/jq '.' > config.tf.json
+      ${terraform}/bin/terraform init
+      ${terraform}/bin/terraform apply
+    '')
+
+    (pkgs.writers.writeBashBin "example-cleanup" ''
+      ${terraform}/bin/terraform destroy
+      rm ${toString ./.}/config.tf.json
+      rm ${toString ./.}/sshkey
+      rm ${toString ./.}/sshkey.pub
+      rm ${toString ./.}/terraform.tfstate*
+    '')
+
+  ];
+}
+