diff --git a/ansible-ctdo/.gitignore b/ansible-ctdo/.gitignore
new file mode 100644
index 0000000..a8b42eb
--- /dev/null
+++ b/ansible-ctdo/.gitignore
@@ -0,0 +1 @@
+*.retry
diff --git a/ansible-ctdo/group_vars/all/main.yml b/ansible-ctdo/group_vars/all/main.yml
new file mode 100644
index 0000000..24d8ec1
--- /dev/null
+++ b/ansible-ctdo/group_vars/all/main.yml
@@ -0,0 +1,15 @@
+---
+cron_apt_mailto: hostmaster@ctdo.de
+
+
+ssmtp_rewrite_domain: "{{ansible_hostname}}.cluster.ctdo.de"
+
+additional_packages:
+  - build-essential
+  - curl
+  - unzip
+  - findutils
+  - dos2unix
+  - gawk
+  - sed
+  - stress
diff --git a/ansible-ctdo/group_vars/nodes/main.yml b/ansible-ctdo/group_vars/nodes/main.yml
new file mode 100644
index 0000000..5355ff9
--- /dev/null
+++ b/ansible-ctdo/group_vars/nodes/main.yml
@@ -0,0 +1,11 @@
+network_interfaces:
+  - device: enp3s0f0
+    auto: true
+    family: inet
+    method: static
+    address: "{{ ansible_host }}"
+    netmask: 23
+    gateway: 10.10.0.1
+    nameservers:
+      - 1.1.1.1
+      - 1.0.0.1
\ No newline at end of file
diff --git a/ansible-ctdo/inventory b/ansible-ctdo/inventory
new file mode 100644
index 0000000..8be912c
--- /dev/null
+++ b/ansible-ctdo/inventory
@@ -0,0 +1,42 @@
+[all]
+master      ansible_host=10.10.0.1
+
+[all:children]
+nodes
+
+[nodes]
+node00        ansible_host=10.10.0.100
+node01        ansible_host=10.10.0.101
+node02        ansible_host=10.10.0.102
+node03        ansible_host=10.10.0.103
+node04        ansible_host=10.10.0.104
+node05        ansible_host=10.10.0.105
+node06        ansible_host=10.10.0.106
+node07        ansible_host=10.10.0.107
+node08        ansible_host=10.10.0.108
+node09        ansible_host=10.10.0.109
+node10        ansible_host=10.10.0.110
+node11        ansible_host=10.10.0.111
+node12        ansible_host=10.10.0.112
+node13        ansible_host=10.10.0.113
+node14        ansible_host=10.10.0.114
+node15        ansible_host=10.10.0.115
+node16        ansible_host=10.10.0.116
+node17        ansible_host=10.10.0.117
+node18        ansible_host=10.10.0.118
+node19        ansible_host=10.10.0.119
+node20        ansible_host=10.10.0.120
+node21        ansible_host=10.10.0.121
+node22        ansible_host=10.10.0.122
+node23        ansible_host=10.10.0.123
+node24        ansible_host=10.10.0.124
+node25        ansible_host=10.10.0.125
+node26        ansible_host=10.10.0.126
+node27        ansible_host=10.10.0.127
+node28        ansible_host=10.10.0.128
+node29        ansible_host=10.10.0.129
+node30        ansible_host=10.10.0.130
+node31        ansible_host=10.10.0.131
+node32        ansible_host=10.10.0.132
+node33        ansible_host=10.10.0.133
+
diff --git a/ansible-ctdo/roles/authkeys/tasks/main.yml b/ansible-ctdo/roles/authkeys/tasks/main.yml
new file mode 100644
index 0000000..16a44c6
--- /dev/null
+++ b/ansible-ctdo/roles/authkeys/tasks/main.yml
@@ -0,0 +1,27 @@
+---
+- name: add authorized keys for user root (for {{group}})
+  tags:
+    - authkeys
+  authorized_key:
+    user: root
+    state: present
+    key: "{{ sshkeys[group]|map(attribute='publish_ssh_key')|join('\n') }}"
+
+
+- name: add authorized keys for user debian
+  tags:
+    - authkeys
+  authorized_key:
+    user: debian
+    state: present
+    key: "{{ sshkeys[group]|map(attribute='publish_ssh_key')|join('\n') }}"
+
+
+#- name: remove authorized keys for user root
+#  tags:
+#    - authkeys
+#  authorized_key:
+#    user: root
+#    state: absent
+#    key: "{{removed|map(attribute='publish_ssh_key')|join('\n') }}"
+
diff --git a/ansible-ctdo/roles/authkeys/vars/main.yml b/ansible-ctdo/roles/authkeys/vars/main.yml
new file mode 100644
index 0000000..ab594aa
--- /dev/null
+++ b/ansible-ctdo/roles/authkeys/vars/main.yml
@@ -0,0 +1,8 @@
+---
+
+sshkeys:
+  admins:
+    - name: lucas
+      publish_ssh_key: ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAvyZgx/+b0YU+CqDXLPbgOoRmpiyKYDkAsfXMpZ+aKVCtGZzmg8OeIVUDv1lbq+qQwNl+fOi7/V+U8w7BpyVUSf5Pn+ld/+eQK1IgkjsDyfdsFiXr4stzCDjpOzRTs/fludZ4WXEtBRJ0IsfX6VJWU2xXBZKrgw62XnbUv/I0hzpckf9Ug9RsCOdS70FfrmRxh2rCEpVdukS4KNyq8MHkwIQM381k26wvsAH6fhNJucICeBIDzfcP61bg4zWLiKQ+q+5c4U7cRoz/N0G2FNOWwQHooQueVC7+SY3Vh2o9AGG2H+Lbrg03e5NSSUBJa2ixZM933evno1yniv/NiTYbGw== lucas@luwo
+    - name: blastor
+      publish_ssh_key: ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFNMlzpRFjkANy1tVafcLpkidbu1GF8cmmJK8dTwMZY4 fabian@fabian-T460s
diff --git a/ansible-ctdo/roles/base/defaults/main.yml b/ansible-ctdo/roles/base/defaults/main.yml
new file mode 100644
index 0000000..7f43e78
--- /dev/null
+++ b/ansible-ctdo/roles/base/defaults/main.yml
@@ -0,0 +1 @@
+ntp_server: ptbtime1.ptb.de ptbtime2.ptb.de ptbtime3.ptb.de
diff --git a/ansible-ctdo/roles/base/handlers/main.yml b/ansible-ctdo/roles/base/handlers/main.yml
new file mode 100644
index 0000000..f287596
--- /dev/null
+++ b/ansible-ctdo/roles/base/handlers/main.yml
@@ -0,0 +1,4 @@
+---
+- name: enable timesyncd
+  command: timedatectl set-ntp true
+
diff --git a/ansible-ctdo/roles/base/tasks/main.yml b/ansible-ctdo/roles/base/tasks/main.yml
new file mode 100644
index 0000000..3a80eb4
--- /dev/null
+++ b/ansible-ctdo/roles/base/tasks/main.yml
@@ -0,0 +1,7 @@
+---
+- name: configure timesyncd
+  template:
+    src: etc/systemd/timesyncd.conf.j2
+    dest: /etc/systemd/timesyncd.conf
+  notify: enable timesyncd
+  when: ansible_service_mgr == "systemd"
diff --git a/ansible-ctdo/roles/base/templates/etc/systemd/timesyncd.conf.j2 b/ansible-ctdo/roles/base/templates/etc/systemd/timesyncd.conf.j2
new file mode 100644
index 0000000..4935c1e
--- /dev/null
+++ b/ansible-ctdo/roles/base/templates/etc/systemd/timesyncd.conf.j2
@@ -0,0 +1,16 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+#
+# Entries in this file show the compile time defaults.
+# You can change settings by editing this file.
+# Defaults can be restored by simply deleting this file.
+#
+# See timesyncd.conf(5) for details.
+
+[Time]
+NTP={{ ntp_server }}
+FallbackNTP=ptbtime1.ptb.de
diff --git a/ansible-ctdo/roles/hostname/tasks/main.yml b/ansible-ctdo/roles/hostname/tasks/main.yml
new file mode 100644
index 0000000..f756eb0
--- /dev/null
+++ b/ansible-ctdo/roles/hostname/tasks/main.yml
@@ -0,0 +1,9 @@
+---
+- name: configure hosts file
+  template:
+    src: hosts.j2
+    dest: /etc/hosts
+
+- name: configure hostname
+  hostname:
+    name: "{{ inventory_hostname }}"
\ No newline at end of file
diff --git a/ansible-ctdo/roles/hostname/templates/hosts.j2 b/ansible-ctdo/roles/hostname/templates/hosts.j2
new file mode 100644
index 0000000..15f5c95
--- /dev/null
+++ b/ansible-ctdo/roles/hostname/templates/hosts.j2
@@ -0,0 +1,8 @@
+# {{ ansible_managed }}
+127.0.0.1   localhost localhost.localdomain {{ inventory_hostname }}
+::1         localhost localhost.localdomain 
+
+# The following lines are desirable for IPv6 capable hosts
+::1     localhost ip6-localhost ip6-loopback
+ff02::1 ip6-allnodes
+ff02::2 ip6-allrouters
diff --git a/ansible-ctdo/roles/packages/files/.bashrc b/ansible-ctdo/roles/packages/files/.bashrc
new file mode 100755
index 0000000..f010a23
--- /dev/null
+++ b/ansible-ctdo/roles/packages/files/.bashrc
@@ -0,0 +1,104 @@
+
+
+# If not running interactively, don't do anything
+case $- in
+    *i*) ;;
+      *) return;;
+esac
+
+
+genpasswd() {
+  local l=$1
+  [ "$l" == "" ] && l=16
+  tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${l} | xargs
+}
+
+[ -z "$PS1" ] && return
+
+export HISTCONTROL=ignoreboth:erasedups
+export HISTSIZE=10000
+
+shopt -s histappend
+shopt -s checkwinsize
+
+if [ "$TERM" != "dumb" ]; then
+    eval "`dircolors -b`"
+    alias ls='ls --color=auto'
+fi
+
+#PS1='\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
+#case "$TERM" in
+#xterm*|rxvt*)
+#    PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}\007"'
+#    ;;
+#*)
+#    ;;
+#esac
+
+
+
+# set variable identifying the chroot you work in (used in the prompt below)
+if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
+    debian_chroot=$(cat /etc/debian_chroot)
+fi
+
+# set a fancy prompt (non-color, unless we know we "want" color)
+case "$TERM" in
+    xterm-color) color_prompt=yes;;
+esac
+
+# uncomment for a colored prompt, if the terminal has the capability; turned
+# off by default to not distract the user: the focus in a terminal window
+# should be on the output of commands, not on the prompt
+force_color_prompt=yes
+
+if [ -n "$force_color_prompt" ]; then
+    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
+	# We have color support; assume it's compliant with Ecma-48
+	# (ISO/IEC-6429). (Lack of such support is extremely rare, and such
+	# a case would tend to support setf rather than setaf.)
+	color_prompt=yes
+    else
+	color_prompt=
+    fi
+fi
+
+if [ "$color_prompt" = yes ]; then
+    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
+else
+    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
+fi
+unset color_prompt force_color_prompt
+
+# If this is an xterm set the title to user@host:dir
+case "$TERM" in
+xterm*|rxvt*)
+    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
+    ;;
+*)
+    ;;
+esac
+
+# enable color support of ls and also add handy aliases
+if [ -x /usr/bin/dircolors ]; then
+    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
+    alias ls='ls --color=auto'
+    #alias dir='dir --color=auto'
+    #alias vdir='vdir --color=auto'
+
+    alias grep='grep --color=auto'
+    alias fgrep='fgrep --color=auto'
+    alias egrep='egrep --color=auto'
+fi
+
+
+alias ll='ls -lAh'
+alias l='ls -lh'
+alias la='ls -a'
+alias screen='screen -RD'
+alias lemonupdate='apt autoremove -y && apt update -y && apt upgrade && apt autoremove -y'
+
+
+stty stop undef
+stty start undef
+
diff --git a/ansible-ctdo/roles/packages/files/.screenrc b/ansible-ctdo/roles/packages/files/.screenrc
new file mode 100644
index 0000000..9986715
--- /dev/null
+++ b/ansible-ctdo/roles/packages/files/.screenrc
@@ -0,0 +1,17 @@
+# disable the blinky terminal on audible bell
+vbell off
+
+autodetach on
+startup_message off
+crlf off
+defscrollback 3000
+silencewait 15   		
+hardstatus alwayslastline "%{= kg}[%H %l] [%c] [%w]"
+
+#so wird auch das bell zeichen ans terminal geschickt
+bell_msg 'Bell in window %n ^G'
+
+# Default Buffers
+#screen -t Shell 1
+#screen -t Shell 2
+#select 0
diff --git a/ansible-ctdo/roles/packages/files/.vimrc b/ansible-ctdo/roles/packages/files/.vimrc
new file mode 100644
index 0000000..667bd9a
--- /dev/null
+++ b/ansible-ctdo/roles/packages/files/.vimrc
@@ -0,0 +1,23 @@
+syntax enable
+set background=dark
+set tabstop=2
+set shiftwidth=2
+set ruler
+set nobackup
+set nowb
+set noswapfile
+set smarttab
+set ai "Auto indent
+set si "Smart indent
+
+set showcmd         " Show (partial) command in status line.
+set showmatch       " Show matching brackets.
+set ignorecase      " Do case insensitive matching
+set smartcase       " Do smart case matching
+set incsearch       " Incremental search
+set autowrite       " Automatically save before commands like :next and :make
+set hidden             " Hide buffers when they are abandoned
+
+"set autoindent
+"set smartindent
+set mouse=
diff --git a/ansible-ctdo/roles/packages/tasks/main.yml b/ansible-ctdo/roles/packages/tasks/main.yml
new file mode 100644
index 0000000..90ae7d3
--- /dev/null
+++ b/ansible-ctdo/roles/packages/tasks/main.yml
@@ -0,0 +1,54 @@
+---
+- name: install default packages
+  tags:
+    - packages
+  apt: name={{item}} state=present update_cache=yes
+  with_items:
+    - vim
+    - sudo
+    - bash-completion
+    - rsync
+    - apt-transport-https
+    - curl
+    - git
+    - htop
+    - screen
+    - iptraf-ng
+
+- name: remove packages
+  tags:
+    - packages
+  apt: name={{item}} state=absent purge=yes
+  with_items:
+    - command-not-found
+    - command-not-found-data
+
+- name: remove additional packages
+  tags:
+    - packages
+  apt: name={{item}} state=absent purge=yes
+  with_items: "{{ additional_remove_packages }}"
+  when: additional_remove_packages is defined and additional_remove_packages
+
+- name: install additional packages
+  tags:
+    - packages
+  apt: name={{item}} state=present update_cache=yes
+  with_items: "{{ additional_packages }}"
+  when: additional_packages is defined and additional_packages
+
+- name: configure dotfiles
+  tags:
+    - packages
+  copy: src=files/{{ item }} dest=/home/{{ansible_user}}/{{ item }}
+  with_items:
+    - .bashrc
+    - .screenrc
+    - .vimrc
+
+- name: set default editor
+  tags:
+    - packages
+  alternatives:
+    name: editor
+    path: /usr/bin/vim
diff --git a/ansible-ctdo/site.yml b/ansible-ctdo/site.yml
new file mode 100644
index 0000000..3ff14b2
--- /dev/null
+++ b/ansible-ctdo/site.yml
@@ -0,0 +1,17 @@
+- hosts: all
+  roles:
+    - { role: packages, tags: 'packages' }
+    - { role: base, tags: 'base' }
+    - { role: authkeys, tags: 'authkeys', group: 'admins' }
+  remote_user: debian
+  become_method: su
+  become: true
+
+- hosts: nodes
+  roles:
+    - { role: dresden-weekly.network-interfaces, tags: 'interfaces' }
+    - { role: hostname, tags: 'hostname' }
+  remote_user: debian
+  become_method: su
+  become: true
+
diff --git a/dhcp/README.md b/dhcp/README.md
new file mode 100644
index 0000000..5c5f3d6
--- /dev/null
+++ b/dhcp/README.md
@@ -0,0 +1,12 @@
+# isc-dhcp-server
+
+install the debian package, check out the hpc-cluster repo to /home/debian/hpc-cluster/
+
+configure /etc/dhcp/dhcpd.conf to 
+
+```
+include "/home/debian/hpc-cluster/dhcp/ctdo.conf";
+```
+
+
+
diff --git a/dhcp/ctdo.conf b/dhcp/ctdo.conf
new file mode 100644
index 0000000..bf64ff8
--- /dev/null
+++ b/dhcp/ctdo.conf
@@ -0,0 +1,155 @@
+option domain-name "cluster.ctdo.de";
+option domain-name-servers 1.1.1.1;
+
+default-lease-time 600;
+max-lease-time 7200;
+ddns-update-style none;
+
+authoritative;
+filename "pxelinux.0";
+
+subnet 10.10.0.0 netmask 255.255.254.0 {
+  range 10.10.1.1 10.10.1.250;
+  option routers 10.10.0.1;
+
+
+host node00	{
+  hardware ethernet 00:30:48:bc:84:56;
+  fixed-address 10.10.0.100;
+}
+host node01 {
+  hardware ethernet 00:30:48:bc:84:7a;
+  fixed-address 10.10.0.101;
+}
+host node02 {
+  hardware ethernet 00:30:48:bc:85:5e;
+  fixed-address 10.10.0.102;
+}
+host node03 {
+  hardware ethernet 00:30:48:bc:84:32;
+  fixed-address 10.10.0.103;
+}
+host node04 {
+  hardware ethernet 00:30:48:bc:86:2e;
+  fixed-address 10.10.0.104;
+}
+host node05 {
+  hardware ethernet 00:30:48:bc:84:0a;
+  fixed-address 10.10.0.105;
+}
+host node06 {
+  hardware ethernet 00:30:48:bc:83:4e;
+  fixed-address 10.10.0.106;
+}
+host node07 {
+  hardware ethernet 00:30:48:bc:34:24;
+  fixed-address 10.10.0.107;
+}
+host node08 {
+  hardware ethernet 00:30:48:bc:85:d2;
+  fixed-address 10.10.0.108;
+}
+host node09 {
+  hardware ethernet 00:30:48:bc:84:de;
+  fixed-address 10.10.0.109;
+}
+host node10 {
+  hardware ethernet 00:30:48:bc:83:6a;
+  fixed-address 10.10.0.110;
+}
+host node11 {
+  hardware ethernet 00:30:48:bc:83:82;
+  fixed-address 10.10.0.111;
+}
+host node12 {
+  hardware ethernet 00:30:48:bc:86:1a;
+  fixed-address 10.10.0.112;
+}
+host node13 {
+  hardware ethernet 00:30:48:bc:66:32;
+  fixed-address 10.10.0.113;
+}
+host node14 {
+  hardware ethernet 00:30:48:bc:86:56;
+  fixed-address 10.10.0.114;
+}
+host node15 {
+  hardware ethernet 00:30:48:bc:36:5c;
+  fixed-address 10.10.0.115;
+}
+host node16 {
+  hardware ethernet 00:30:48:bc:85:e6;
+  fixed-address 10.10.0.116;
+}
+host node17 {
+  hardware ethernet 00:30:48:bc:86:4e;
+  fixed-address 10.10.0.117;
+}
+host node18 {
+  hardware ethernet 00:30:48:bc:85:aa;
+  fixed-address 10.10.0.118;
+}
+host node19 {
+  hardware ethernet 00:30:48:bc:85:ce;
+  fixed-address 10.10.0.119;
+}
+host node20 {
+  hardware ethernet 00:30:48:bc:36:8c;
+  fixed-address 10.10.0.120;
+}
+host node21 {
+  hardware ethernet 00:30:48:bc:36:94;
+  fixed-address 10.10.0.121;
+}
+host node22 {
+  hardware ethernet 00:30:48:bc:86:5a;
+  fixed-address 10.10.0.122;
+}
+host node23 {
+  hardware ethernet 00:30:48:bc:86:36;
+  fixed-address 10.10.0.123;
+}
+host node24 {
+  hardware ethernet 00:30:48:bc:83:9e;
+  fixed-address 10.10.0.124;
+}
+host node25 {
+  hardware ethernet 00:30:48:bc:85:1e;
+  fixed-address 10.10.0.125;
+}
+host node26 {
+  hardware ethernet 00:30:48:bc:86:16;
+  fixed-address 10.10.0.126;
+}
+host node27 {
+  hardware ethernet 00:30:48:bc:34:94;
+  fixed-address 10.10.0.127;
+}
+host node28 {
+  hardware ethernet 00:30:48:bc:86:62;
+  fixed-address 10.10.0.128;
+}
+host node29 {
+  hardware ethernet 00:30:48:bc:84:62;
+  fixed-address 10.10.0.129;
+}
+host node30 {
+  hardware ethernet 00:30:48:bc:85:da;
+  fixed-address 10.10.0.130;
+}
+host node31 {
+  hardware ethernet 00:30:48:bc:85:de;
+  fixed-address 10.10.0.131;
+}
+host node32 {
+  hardware ethernet 00:30:48:bc:85:72;
+  fixed-address 10.10.0.132;
+}
+host node33 {
+  hardware ethernet 00:30:48:bc:84:4e;
+  fixed-address 10.10.0.133;
+}
+
+
+
+}