Debian jessie auto-install file. Put it into your initrd.gz of your tftp server, or use via http.

preseed.cfg

# Locale / Keymap
d-i debian-installer/locale                   string en_US.UTF-8
d-i debian-installer/keymap                   select de-latin1
d-i console-keymaps-at/keymap                 select de
d-i keyboard-configuration/xkb-keymap         select nodeadkeys
d-i languagechooser/language-name-fb          select German
d-i countrychooser/country-name               select Germany
d-i console-setup/layoutcode                  string de_DE
# Netzwerk-Konfiguration
d-i netcfg/dhcp_timeout                       string 30
d-i netcfg/choose_interface                   select eth0
d-i netcfg/hostname                           string j1
d-i hw-detect/load_firmware                   boolean true
# Installationsquelle
d-i mirror/country                            string manual

# use local apt-cacher-ng instance
d-i mirror/http/hostname                      string x200s:3142
d-i mirror/http/directory                     string /ftp.de.debian.org/debian
# without apt-cacher-ng this would be:
#d-i mirror/http/hostname                      string ftp.de.debian.org
#d-i mirror/http/directory                     string /debian

d-i mirror/codename                           string jessie
d-i mirror/suite                              string jessie
d-i mirror/udeb/suite                         string jessie
d-i mirror/http/proxy                         string
d-i mirror/noarch                             error
# Installer / Apt-Setup
d-i debian-installer/allow_unauthenticated    string true
d-i finish-install/reboot_in_progress         note
d-i prebaseconfig/reboot_in_progress          note
d-i apt-setup/non-free                        boolean true
d-i apt-setup/contrib                         boolean true
# Uhr und Zeitzone
d-i clock-setup/utc                           boolean true
d-i clock-setup/ntp                           boolean true
d-i clock-setup/ntp-server                    string  0.pool.ntp.org
d-i time/zone                                 string Europe/Berlin
# Partitionierung / Grub
d-i partman-auto/disk                         string /dev/sda
d-i partman-auto/method                       string regular
d-i partman-lvm/device_remove_lvm             boolean true
d-i partman-auto/purge_lvm_from_device        boolean true
d-i partman-lvm/confirm                       boolean true
d-i partman/alignment                         select cylinder
d-i partman/confirm                           boolean true
d-i partman-basicfilesystems/no_swap          boolean false
d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition                  select finish
d-i partman/confirm_nooverwrite               boolean true
d-i grub-installer/only_debian                boolean true
d-i grub-installer/bootdev                    string /dev/sda
d-i partman-auto/choose_recipe                select condpart
# Boot/Root-Partition, Zahlen in MB
d-i partman-auto/expert_recipe string             \
 condpart ::                                      \
  500 500 500 ext4                             \
     $primary{ }  $bootable{ }                    \
     method{ format } format{ }                   \
     use_filesystem{ } filesystem{ ext4 }        \
     mountpoint{ /boot }                              \
 .                                                \
 2000 3000 8000000 btrfs                             \
     $primary{ }                      \
     method{ format } format{ }                   \
     use_filesystem{ } filesystem{ btrfs }        \
     mountpoint{ / }                              \
 .
# Root User anlegen
d-i passwd/root-login                         boolean true
### create a password with `printf "r00tme" | mkpasswd -s -m sha-512`
d-i passwd/root-password-crypted              password $6$COG5zG5hbNHb$AL/eevQDbVuvyzb7oHKHW654rTgzJHqh6Hg1ktxv4bG8Pjnnb0ILXUa3u1RbN45wSnBUb/jXjYGgRF9u64yTR/
# User anlegen
d-i passwd/user-fullname                      string Christoph Sarnowski
d-i passwd/username                           string csar
# User-Passwort
d-i passwd/user-password-crypted              password $6$COG5zG5hbNHb$AL/eevQDbVuvyzb7oHKHW654rTgzJHqh6Hg1ktxv4bG8Pjnnb0ILXUa3u1RbN45wSnBUb/jXjYGgRF9u64yTR/
# Software Selections
tasksel tasksel/first                         multiselect  ssh-server standard kde-desktop
tasksel tasksel/desktop                       multiselect  kde
d-i     pkgsel/include                        string       \
ssh vim ethtool sysstat ntp ntpdate git etckeeper build-essential zsh emacs tmux sudo
# Mail-Konfiguration
exim4-config     exim4/no_config              boolean true
exim4-config     exim4/exim3_upgrade          boolean true
# SSH-Server
ssh ssh/new_config                            boolean true
ssh ssh/use_old_init_script                   boolean true
ssh ssh/protocol2_only                        boolean true
ssh ssh/run_sshd                              boolean true
ssh ssh/SUID_client                           boolean true
ssh ssh/disable_cr_auth                       boolean false
# Pop-Contest
popularity-contest popularity-contest/participate boolean false
### Apt setup
# You can choose to install non-free and contrib software.
d-i apt-setup/non-free boolean true
d-i apt-setup/contrib boolean true
d-i apt-setup/services-select multiselect security
d-i apt-setup/security_host string security.debian.org

# post install script
# https doesnt work here! use http or ftp
# using local webserver serving the post-install script
d-i preseed/late_command string \
    cd /target; \
    wget http://x200s/post-install.sh; \
    chmod +x ./post-install.sh; \
    chroot ./ ./post-install.sh; \
    rm -f ./post-install.sh; \
    cp /var/log/syslog /target/root/install-syslog;