镜像

首先你需要一个ubuntu系统安装镜像文件，这里使用的是ubuntu-14.04-server-amd64.iso。

挂载ubuntu iso：

mkdir /mnt/ubuntu

sudo mount -t iso9660 ubuntu-14.04-server-amd64.iso /mnt/ubuntu/ -o loop

Note:mount会在重启后失效，如果不想重复执行，可以把mount命令加到/etc/profile中

DHCP服务

安装dhcp server：

sudo apt-get install isc-dhcp-server

配置dhcp server（假设本机ip为192.168.16.1）：

sudo vi /etc/dhcp/dhcpd.conf

添加以下内容:

subnet 192.168.16.0 netmask 255.255.255.0 {

  range 192.168.16.200 192.168.16.250;

  option routers 192.168.16.1;

  option broadcast-address 192.168.16.255;

  default-lease-time 600;

  max-lease-time 7200;

  filename "pxelinux.0";

}

• range为分配给dhcp client的地址池首尾地址。

• 修改记得重启服务：sudo service isc-dhcp-server restart

tftp服务

安装tftp服务:

sudo apt-get install tftpd-hpa

配置tftp服务，添加必须的文件到tftp指定的目录，tftpd-hpa默认根目录为/srv/tftp。

sudo cp -R /mnt/ubuntu/install/netboot/* /srv/tftp/

http服务

web服务采用的是lighttpd程序，你也可以采用apache等。

sudo apt-get install lighttpd

安装好后，默认的根目录为/var/www，你也可以通过修改配置文件来修改默认的根目录，这里我们采用默认的根目录

创建ubuntu链接。

sudo ln -s /mnt/ubuntu /var/www/ubuntu

如果不出意外，可以通过浏览器访问http://192.168.16.1/ubuntu/md5sum.txt

此时已经可以达到网络安装的目的了，但是所有选项还是需要手动在客户机上操作。

下面将通过配置初步达到完全的无人值守安装的效果。

创建新的initrd.gz

此处ubuntu镜像是64位的，如果是32位，amd64改为i386。

cd /srv/tftp/ubuntu-installer/amd64/

cp initrd.gz ~/

cd ~

gunzip initrd.gz

mv initrd initrd.img 

mkdir initrd

cd initrd

cpio –i <../initrd.img

vi preseed.cfg

下面假设pxe服务器（本机）ip为192.168.16.1，复制以下内容到 preseed.cfg，可以根据自己的需求修改配置。

#### Contents of the preconfiguration file (for lenny)

### Localization

# Preseeding only locale sets language, country and locale.

d-i debian-installer/locale string en_US



# The values can also be preseeded individually for greater flexibility.

#d-i debian-installer/language string en

#d-i debian-installer/country string NL

#d-i debian-installer/locale string en_GB.UTF-8

# Optionally specify additional locales to be generated.

#d-i localechooser/supported-locales en_US.UTF-8, nl_NL.UTF-8



# Keyboard selection.

# Disable automatic (interactive) keymap detection.

d-i console-setup/ask_detect boolean false

#d-i keyboard-configuration/modelcode string pc105

d-i keyboard-configuration/layoutcode string us

# To select a variant of the selected layout (if you leave this out, the

# basic form of the layout will be used):

#d-i keyboard-configuration/variantcode string dvorak



### Network configuration

# Disable network configuration entirely. This is useful for cdrom

# installations on non-networked devices where the network questions,

# warning and long timeouts are a nuisance.

#d-i netcfg/enable boolean false



# netcfg will choose an interface that has link if possible. This makes it

# skip displaying a list if there is more than one interface.

d-i netcfg/choose_interface select auto



# To pick a particular interface instead:

#d-i netcfg/choose_interface select eth1



# If you have a slow dhcp server and the installer times out waiting for

# it, this might be useful.

#d-i netcfg/dhcp_timeout string 60



# If you prefer to configure the network manually, uncomment this line and

# the static network configuration below.

#d-i netcfg/disable_autoconfig boolean true



# If you want the preconfiguration file to work on systems both with and

# without a dhcp server, uncomment these lines and the static network

# configuration below.

#d-i netcfg/dhcp_failed note

#d-i netcfg/dhcp_options select Configure network manually



# Static network configuration.

d-i netcfg/get_nameservers string 192.168.16.1

#d-i netcfg/get_ipaddress string 192.168.1.42

#d-i netcfg/get_netmask string 255.255.255.0

#d-i netcfg/get_gateway string 192.168.1.1

#d-i netcfg/confirm_static boolean true



# Any hostname and domain names assigned from dhcp take precedence over

# values set here. However, setting the values still prevents the questions

# from being shown, even if values come from dhcp.

d-i netcfg/get_hostname string dyang

d-i netcfg/get_domain string dyang



# Disable that annoying WEP key dialog.

d-i netcfg/wireless_wep string

# The wacky dhcp hostname that some ISPs use as a password of sorts.

#d-i netcfg/dhcp_hostname string radish



# If non-free firmware is needed for the network or other hardware, you can

# configure the installer to always try to load it, without prompting. Or

# change to false to disable asking.

#d-i hw-detect/load_firmware boolean true



### Network console

# Use the following settings if you wish to make use of the network-console

# component for remote installation over SSH. This only makes sense if you

# intend to perform the remainder of the installation manually.

#d-i anna/choose_modules string network-console

#d-i network-console/password password r00tme

#d-i network-console/password-again password r00tme

# Use this instead if you prefer to use key-based authentication

#d-i network-console/authorized_keys_url http://host/authorized_keys



### Mirror settings

# If you select ftp, the mirror/country string does not need to be set.

#d-i mirror/protocol string http 

#d-i mirror/country string manual

#d-i mirror/http/hostname string 192.168.16.1

#d-i mirror/http/directory string /ubuntu

#d-i mirror/http/proxy string 



# Alternatively: by default, the installer uses CC.archive.ubuntu.com where

# CC is the ISO-3166-2 code for the selected country. You can preseed this

# so that it does so without asking.

d-i mirror/http/mirror select CC.archive.ubuntu.com



# Suite to install.

#d-i mirror/suite string lenny

# Suite to use for loading installer components (optional).

#d-i mirror/udeb/suite string lenny

# Components to use for loading installer components (optional).

#d-i mirror/udeb/components multiselect main, restricted



### Clock and time zone setup

# Controls whether or not the hardware clock is set to UTC.

d-i clock-setup/utc boolean true



# You may set this to any valid setting for $TZ; see the contents of

# /usr/share/zoneinfo/ for valid values.

d-i time/zone string Asia/Shanghai



# Controls whether to use NTP to set the clock during the install

d-i clock-setup/ntp boolean true

# NTP server to use. The default is almost always fine here.

#d-i clock-setup/ntp-server string ntp.example.com



### Partitioning

## Partitioning example

# If the system has free space you can choose to only partition that space.

# This is only honoured if partman-auto/method (below) is not set.

# Alternatives: custom, some_device, some_device_crypto, some_device_lvm.

#d-i partman-auto/init_automatically_partition select biggest_free



# Alternatively, you may specify a disk to partition. If the system has only

# one disk the installer will default to using that, but otherwise the device

# name must be given in traditional, non-devfs format (so e.g. /dev/hda or

# /dev/sda, and not e.g. /dev/discs/disc0/disc).

# For example, to use the first SCSI/SATA hard disk:

#d-i partman-auto/disk string /dev/sda

# In addition, you'll need to specify the method to use.

# The presently available methods are:

# - regular: use the usual partition types for your architecture

# - lvm:     use LVM to partition the disk

# - crypto:  use LVM within an encrypted partition

d-i partman-auto/method string regular



# If one of the disks that are going to be automatically partitioned

# contains an old LVM configuration, the user will normally receive a

# warning. This can be preseeded away...

d-i partman-lvm/device_remove_lvm boolean true

# The same applies to pre-existing software RAID array:

d-i partman-md/device_remove_md boolean true

# And the same goes for the confirmation to write the lvm partitions.  d-i partman-lvm/confirm boolean true 

# For LVM partitioning, you can select how much of the volume group to use

# for logical volumes.

d-i partman-auto-lvm/guided_size string max

#d-i partman-auto-lvm/guided_size string 10GB

#d-i partman-auto-lvm/guided_size string 50%



# You can choose one of the three predefined partitioning recipes:

# - atomic: all files in one partition

# - home:   separate /home partition

# - multi:  separate /home, /usr, /var, and /tmp partitions

d-i partman-auto/choose_recipe select atomic



# Or provide a recipe of your own...

# If you have a way to get a recipe file into the d-i environment, you can

# just point at it.

#d-i partman-auto/expert_recipe_file string /hd-media/recipe



# If not, you can put an entire recipe into the preconfiguration file in one

# (logical) line. This example creates a small /boot partition, suitable

# swap, and uses the rest of the space for the root partition:

#d-i partman-auto/expert_recipe string                         \

#      boot-root ::                                            \

#              40 50 100 ext3                                  \

#                      $primary{ } $bootable{ }                \

#                      method{ format } format{ }              \

#                      use_filesystem{ } filesystem{ ext3 }    \

#                      mountpoint{ /boot }                     \

#              .                                               \

#              500 10000 1000000000 ext3                       \

#                      method{ format } format{ }              \

#                      use_filesystem{ } filesystem{ ext3 }    \

#                      mountpoint{ / }                         \

#              .                                               \

#              64 512 300% linux-swap                          \

#                      method{ swap } format{ }                \

#              .



# If you just want to change the default filesystem from ext3 to something

# else, you can do that without providing a full recipe.

#d-i partman/default_filesystem string ext4



# The full recipe format is documented in the file partman-auto-recipe.txt

# included in the 'debian-installer' package or available from D-I source

# repository. This also documents how to specify settings such as file

# system labels, volume group names and which physical devices to include

# in a volume group.



# This makes partman automatically partition without confirmation, provided

# that you told it what to do using one of the methods above.

d-i partman-partitioning/confirm_write_new_label boolean true

d-i partman/choose_partition select finish

d-i partman/confirm boolean true

d-i partman/confirm_nooverwrite boolean true



## Partitioning using RAID

# The method should be set to "raid".

#d-i partman-auto/method string raid

# Specify the disks to be partitioned. They will all get the same layout,

# so this will only work if the disks are the same size.

#d-i partman-auto/disk string /dev/sda /dev/sdb



# Next you need to specify the physical partitions that will be used. 

#d-i partman-auto/expert_recipe string \

#      multiraid ::                                         \

#              1000 5000 4000 raid                          \

#                      $primary{ } method{ raid }           \

#              .                                            \

#              64 512 300% raid                             \

#                      method{ raid }                       \

#              .                                            \

#              500 10000 1000000000 raid                    \

#                      method{ raid }                       \

#              .



# Last you need to specify how the previously defined partitions will be

# used in the RAID setup. Remember to use the correct partition numbers

# for logical partitions. RAID levels 0, 1, 5, 6 and 10 are supported;

# devices are separated using "#".

# Parameters are:

# <raidtype> <devcount> <sparecount> <fstype> <mountpoint> \

#          <devices> <sparedevices>



#d-i partman-auto-raid/recipe string \

#    1 2 0 ext3 /                    \

#          /dev/sda1#/dev/sdb1       \

#    .                               \

#    1 2 0 swap -                    \

#          /dev/sda5#/dev/sdb5       \

#    .                               \

#    0 2 0 ext3 /home                \

#          /dev/sda6#/dev/sdb6       \

#    .



# For additional information see the file partman-auto-raid-recipe.txt

# included in the 'debian-installer' package or available from D-I source

# repository.



# This makes partman automatically partition without confirmation.

d-i partman-md/confirm boolean true



## Controlling how partitions are mounted

# The default is to mount by UUID, but you can also choose "traditional" to

# use traditional device names, or "label" to try filesystem labels before

# falling back to UUIDs.

#d-i partman/mount_style select uuid



d-i live-installer/net-image string http://192.168.16.1/ubuntu/install/filesystem.squashfs

### Base system installation

# Configure APT to not install recommended packages by default. Use of this

# option can result in an incomplete system and should only be used by very

# experienced users.

#d-i base-installer/install-recommends boolean false



# The kernel image (meta) package to be installed; "none" can be used if no

# kernel is to be installed.

d-i base-installer/kernel/image string linux-generic



### Account setup

# Skip creation of a root account (normal user account will be able to

# use sudo). The default is false; preseed this to true if you want to set

# a root password.

#d-i passwd/root-login boolean false

# Alternatively, to skip creation of a normal user account.

#d-i passwd/make-user boolean false



# Root password, either in clear text

#d-i passwd/root-password password r00tme

#d-i passwd/root-password-again password r00tme

# or encrypted using an MD5 hash.

#d-i passwd/root-password-crypted password [MD5 hash]



# To create a normal user account.

d-i passwd/user-fullname string dyang

d-i passwd/username string dyang

# Normal user's password, either in clear text

d-i passwd/user-password password dyang

d-i passwd/user-password-again password dyang

# or encrypted using an MD5 hash.

#d-i passwd/user-password-crypted password [MD5 hash]

# Create the first user with the specified UID instead of the default.

d-i passwd/user-uid string 1010

# The installer will warn about weak passwords. If you are sure you know

# what you're doing and want to override it, uncomment this.

#d-i user-setup/allow-password-weak boolean true



# The user account will be added to some standard initial groups. To

# override that, use this.

#d-i passwd/user-default-groups string audio cdrom video



# Set to true if you want to encrypt the first user's home directory.

d-i user-setup/encrypt-home boolean false



### Apt setup

# You can choose to install restricted and universe software, or to install

# software from the backports repository.

#d-i apt-setup/restricted boolean true

#d-i apt-setup/universe boolean true

#d-i apt-setup/backports boolean true

# Uncomment this if you don't want to use a network mirror.

d-i apt-setup/use_mirror boolean false

# Select which update services to use; define the mirrors to be used.

# Values shown below are the normal defaults.

d-i apt-setup/services-select multiselect security

d-i apt-setup/security_host string 192.168.16.1

d-i apt-setup/security_path string /ubuntu



# Additional repositories, local[0-9] available

#d-i apt-setup/local0/repository string \

#       http://local.server/ubuntu lenny main

#d-i apt-setup/local0/comment string local server

# Enable deb-src lines

#d-i apt-setup/local0/source boolean true

# URL to the public key of the local repository; you must provide a key or

# apt will complain about the unauthenticated repository and so the

# sources.list line will be left commented out

#d-i apt-setup/local0/key string http://local.server/key



# By default the installer requires that repositories be authenticated

# using a known gpg key. This setting can be used to disable that

# authentication. Warning: Insecure, not recommended.

d-i debian-installer/allow_unauthenticated boolean true



### Package selection

#tasksel tasksel/first multiselect ubuntu-desktop

#tasksel tasksel/first multiselect lamp-server, print-server

#tasksel tasksel/first multiselect kubuntu-desktop

tasksel tasksel/first multiselect standard



# Individual additional packages to install

d-i pkgsel/include string openssh-server build-essential

# Whether to upgrade packages after debootstrap.

# Allowed values: none, safe-upgrade, full-upgrade

d-i pkgsel/upgrade select none



# Language pack selection

#d-i pkgsel/language-packs multiselect de, en, zh



# Policy for applying updates. May be "none" (no automatic updates),

# "unattended-upgrades" (install security updates automatically), or

# "landscape" (manage system with Landscape).

d-i pkgsel/update-policy select none



# Some versions of the installer can report back on what software you have

# installed, and what software you use. The default is not to report back,

# but sending reports helps the project determine what software is most

# popular and include it on CDs.

#popularity-contest popularity-contest/participate boolean false



# By default, the system's locate database will be updated after the

# installer has finished installing most packages. This may take a while, so

# if you don't want it, you can set this to "false" to turn it off.

#d-i pkgsel/updatedb boolean true



### Boot loader installation

# Grub is the default boot loader (for x86). If you want lilo installed

# instead, uncomment this:

#d-i grub-installer/skip boolean true

# To also skip installing lilo, and install no bootloader, uncomment this

# too:

#d-i lilo-installer/skip boolean true



# With a few exceptions for unusual partitioning setups, GRUB 2 is now the

# default. If you need GRUB Legacy for some particular reason, then

# uncomment this:

#d-i grub-installer/grub2_instead_of_grub_legacy boolean false



# This is fairly safe to set, it makes grub install automatically to the MBR

# if no other operating system is detected on the machine.

d-i grub-installer/only_debian boolean true



# This one makes grub-installer install to the MBR if it also finds some other

# OS, which is less safe as it might not be able to boot that other OS.

#d-i grub-installer/with_other_os boolean true



# Alternatively, if you want to install to a location other than the mbr,

# uncomment and edit these lines:

#d-i grub-installer/only_debian boolean false

#d-i grub-installer/with_other_os boolean false

#d-i grub-installer/bootdev  string (hd0,0)

# To install grub to multiple disks:

#d-i grub-installer/bootdev  string (hd0,0) (hd1,0) (hd2,0)



# Optional password for grub, either in clear text

#d-i grub-installer/password password r00tme

#d-i grub-installer/password-again password r00tme

# or encrypted using an MD5 hash, see grub-md5-crypt(8).

#d-i grub-installer/password-crypted password [MD5 hash]



# Use the following option to add additional boot parameters for the

# installed system (if supported by the bootloader installer).

# Note: options passed to the installer will be added automatically.

#d-i debian-installer/add-kernel-opts string nousb



### Finishing up the installation

# During installations from serial console, the regular virtual consoles

# (VT1-VT6) are normally disabled in /etc/inittab. Uncomment the next

# line to prevent this.

#d-i finish-install/keep-consoles boolean true



# Avoid that last message about the install being complete.

d-i finish-install/reboot_in_progress note



# This will prevent the installer from ejecting the CD during the reboot,

# which is useful in some situations.

#d-i cdrom-detect/eject boolean false



# This is how to make the installer shutdown when finished, but not

# reboot into the installed system.

#d-i debian-installer/exit/halt boolean true

# This will power off the machine instead of just halting it.

#d-i debian-installer/exit/poweroff boolean true



### X configuration

# X can detect the right driver for some cards, but if you're preseeding,

# you override whatever it chooses. Still, vesa will work most places.

#xserver-xorg xserver-xorg/config/device/driver select vesa



# A caveat with mouse autodetection is that if it fails, X will retry it

# over and over. So if it's preseeded to be done, there is a possibility of

# an infinite loop if the mouse is not autodetected.

#xserver-xorg xserver-xorg/autodetect_mouse boolean true



# Monitor autodetection is recommended.

xserver-xorg xserver-xorg/autodetect_monitor boolean true

# Uncomment if you have an LCD display.

#xserver-xorg xserver-xorg/config/monitor/lcd boolean true

# X has three configuration paths for the monitor. Here's how to preseed

# the "medium" path, which is always available. The "simple" path may not

# be available, and the "advanced" path asks too many questions.

xserver-xorg xserver-xorg/config/monitor/selection-method \

       select medium

xserver-xorg xserver-xorg/config/monitor/mode-list \

       select 1024x768 @ 60 Hz



### Preseeding other packages

# Depending on what software you choose to install, or if things go wrong

# during the installation process, it's possible that other questions may

# be asked. You can preseed those too, of course. To get a list of every

# possible question that could be asked during an install, do an

# installation, and then run these commands:

#   debconf-get-selections --installer > file

#   debconf-get-selections >> file





#### Advanced options

### Running custom commands during the installation

# d-i preseeding is inherently not secure. Nothing in the installer checks

# for attempts at buffer overflows or other exploits of the values of a

# preconfiguration file like this one. Only use preconfiguration files from

# trusted locations! To drive that home, and because it's generally useful,

# here's a way to run any shell command you'd like inside the installer,

# automatically.



# This first command is run as early as possible, just after

# preseeding is read.

#d-i preseed/early_command string anna-install some-udeb

# This command is run immediately before the partitioner starts. It may be

# useful to apply dynamic partitioner preseeding that depends on the state

# of the disks (which may not be visible when preseed/early_command runs).

#d-i partman/early_command \

#       string debconf-set partman-auto/disk "$(list-devices disk | head -n1)"

# This command is run just before the install finishes, but when there is

# still a usable /target directory. You can chroot to /target and use it

# directly, or use the apt-install and in-target commands to easily install

# packages and run commands in the target system.

#d-i preseed/late_command string apt-install zsh; in-target chsh -s /bin/zsh

上面很多配置就不细说了，可以根据注释说明修改，注意把我的ip修改成你自己的基本问题不大，此处特别讲以下我选择了默认安装的软件：

d-i pkgsel/include string openssh-server build-essential

保存文件后在initerd下执行命令，将在～/下生成新的initrd.gz，然后复制到tftp路径

find . | cpio -o -H newc |gzip -9 >../initrd.gz

sudo cp ../initrd.gz /srv/tftp/ubuntu-installer/amd64/

自动选择Install

此时你已经可以自动配置安装了。

但是还有个问题，就是客户机开机后会显示Install boot menu，仍然需要手工确认Install选项才开始安装。

下面继续修改：

sudo vi /srv/tftp/pxelinux.cfg/default

主要修改其中的timeout项，先确认默认选项已经为Install，只需要设置超时自动确认当前选中项即可，timeout单位为1/10秒。这里我使用的是1秒后自动进入安装。

此修改存在风险，任何接入的PC都可能被重装系统，所以根据需要调整。为0时无限等待手动选择。

# D-I config version 2.0

include ubuntu-installer/amd64/boot-screens/menu.cfg

default ubuntu-installer/amd64/boot-screens/vesamenu.c32

prompt 0

timeout 10