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Laurent GUERBY, 06/16/2015 07:02 PM

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{{>toc}}
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h1. Preseed
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h2. Documentation
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This page document a preseed setup in an environment where you already have a DHCP server. The idea is to add a PXE server that will do only the PXE part of the work.
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Assuming :
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* on the PXE server : apt-get install dnsmasq 
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* you have a DHCP (no PXE) server at 10.2.255.254
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* your PXE server interface is eth0
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* your PXE server IP on eth0 is 10.2.137.101
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* you have an http proxy which will be useful to cache locally all downloaded packages, here : http://cache.ut-capitole.fr:3128
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h2. Files
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<pre>
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root@c1:~# cat /etc/dnsmasq.d/pxeu.conf
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# disable dns
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port=0
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interface=eth0
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# replace with real dhcp server
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#dhcp-range=192.168.1.0,proxy
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dhcp-range=10.2.255.254,proxy
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# Tell PXE clients not to use multicast discovery
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dhcp-option=vendor:PXEClient,6,2b
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dhcp-no-override
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# Enable this for better debugging
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#log-dhcp
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enable-tftp
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tftp-root=/var/lib/tftpboot
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pxe-service=x86PC, "Install Linux", pxelinux
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</pre>
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<pre>
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root@c1:~# cat pxe-setup.sh 
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#!/bin/bash
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set -x
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YOURMIRROR=archive.ubuntu.com
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ARCH=amd64
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VENDOR=ubuntu
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DIST=trusty
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DEST=/var/lib/tftpboot
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mkdir -p $DEST
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cd $DEST
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rm -rf netboot.tar.gz Release* SHA* ${VENDOR}-installer version.info pxelinux.0 pxelinux.cfg ldlinux.c32
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wget -q http://"$YOURMIRROR"/${VENDOR}/dists/${DIST}/main/installer-"$ARCH"/current/images/netboot/netboot.tar.gz
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wget -q http://"$YOURMIRROR"/${VENDOR}/dists/${DIST}/main/installer-"$ARCH"/current/images/SHA256SUMS
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wget -q http://"$YOURMIRROR"/${VENDOR}/dists/${DIST}/Release
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wget -q http://"$YOURMIRROR"/${VENDOR}/dists/${DIST}/Release.gpg
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tar -xzf netboot.tar.gz
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</pre>
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<pre>
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root@c1:/var/lib/tftpboot# cat preseed.cfg
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### Localization
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# Preseeding only locale sets language, country and locale.
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d-i debian-installer/locale string en_US.UTF-8
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# Keyboard selection.
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# Disable automatic (interactive) keymap detection.
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d-i console-setup/ask_detect boolean false
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d-i keyboard-configuration/layoutcode string fr
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### Network configuration
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# netcfg will choose an interface that has link if possible. This makes it
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# skip displaying a list if there is more than one interface.
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d-i netcfg/choose_interface select auto
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# Just in case our DHCP server is busy.
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d-i netcfg/dhcp_timeout string 60
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# Any hostname and domain names assigned from dhcp take precedence over
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# values set here. However, setting the values still prevents the questions
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# from being shown, even if values come from dhcp.
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d-i netcfg/get_hostname string unassigned-hostname
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d-i netcfg/get_domain string unassigned-domain
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# Disable that annoying WEP key dialog.
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d-i netcfg/wireless_wep string
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# Always install the server kernel
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d-i	base-installer/kernel/override-image string linux-server
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### Mirror settings
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# Alternatively: by default, the installer uses CC.archive.ubuntu.com where
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# CC is the ISO-3166-2 code for the selected country. You can preseed this
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# so that it does so without asking.
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d-i mirror/http/mirror select archive.ubuntu.com
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d-i mirror/http/proxy string http://cache.ut-capitole.fr:3128
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### Clock and time zone setup
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# Controls whether or not the hardware clock is set to UTC.
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d-i clock-setup/utc boolean true
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# You may set this to any valid setting for $TZ; see the contents of
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# /usr/share/zoneinfo/ for valid values.
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d-i time/zone string Etc/UTC
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# Controls whether to use NTP to set the clock during the install
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d-i clock-setup/ntp boolean true
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### Partitioning
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d-i partman-auto/disk string /dev/sda
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# The presently available methods are:
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# - regular: use the usual partition types for your architecture
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# - lvm:     use LVM to partition the disk
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# - crypto:  use LVM within an encrypted partition
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d-i partman-auto/method string regular
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# If one of the disks that are going to be automatically partitioned
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# contains an old LVM configuration, the user will normally receive a
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# warning. This can be preseeded away...
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d-i partman-lvm/device_remove_lvm boolean true
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# The same applies to pre-existing software RAID array:
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d-i partman-md/device_remove_md boolean true
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# And the same goes for the confirmation to write the lvm partitions.
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d-i partman-lvm/confirm boolean true
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# For LVM partitioning, you can select how much of the volume group to use
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# for logical volumes.
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#d-i partman-auto-lvm/guided_size string max
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# You can choose one of the three predefined partitioning recipes:
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# - atomic: all files in one partition
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# - home:   separate /home partition
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# - multi:  separate /home, /usr, /var, and /tmp partitions
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# d-i partman-auto/choose_recipe select atomic
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d-i partman-auto/expert_recipe string root :: 2048 30720 20000000 ext4 \
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			$primary{ } $bootable{ } \
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			method{ format } format{ } \
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			use_filesystem{ } filesystem{ ext4 } \
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			mountpoint{ / } .
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partman-basicfilesystems partman-basicfilesystems/no_swap boolean false
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d-i partman-basicfilesystems partman-basicfilesystems/no_swap boolean false 
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# If you just want to change the default filesystem from ext3 to something
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# else, you can do that without providing a full recipe.
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d-i partman/default_filesystem string ext4
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# This makes partman automatically partition without confirmation, provided
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# that you told it what to do using one of the methods above.
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d-i partman-partitioning/confirm_write_new_label boolean true
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d-i partman/choose_partition select finish
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d-i partman/confirm boolean true
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d-i partman/confirm_nooverwrite boolean true
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### Base system installation
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### Account setup
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d-i passwd/root-password password root
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d-i passwd/root-password-again password root
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# To create a normal user account.
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d-i passwd/user-fullname string guest
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d-i passwd/username string guest
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d-i passwd/user-password password guest
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d-i passwd/user-password-again password guest
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# The installer will warn about weak passwords. If you are sure you know
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# what you're doing and want to override it, uncomment this.
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d-i user-setup/allow-password-weak boolean true
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# Set to true if you want to encrypt the first user's home directory.
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d-i user-setup/encrypt-home boolean false
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### Apt setup
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# You can choose to install restricted and universe software, or to install
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# software from the backports repository.
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#d-i apt-setup/restricted boolean true
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#d-i apt-setup/universe boolean true
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#d-i apt-setup/backports boolean true
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# Uncomment this if you don't want to use a network mirror.
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#d-i apt-setup/use_mirror boolean false
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# Select which update services to use; define the mirrors to be used.
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# Values shown below are the normal defaults.
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#d-i apt-setup/services-select multiselect security
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#d-i apt-setup/security_host string security.ubuntu.com
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#d-i apt-setup/security_path string /ubuntu
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# Additional repositories, local[0-9] available
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#d-i apt-setup/local0/repository string \
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#       http://local.server/ubuntu squeeze main
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#d-i apt-setup/local0/comment string local server
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# Enable deb-src lines
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#d-i apt-setup/local0/source boolean true
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# URL to the public key of the local repository; you must provide a key or
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# apt will complain about the unauthenticated repository and so the
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# sources.list line will be left commented out
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#d-i apt-setup/local0/key string http://local.server/key
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### Package selection
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tasksel	tasksel/force-tasks	string standard,server,desktop
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tasksel tasksel/first multiselect standard,server,desktop
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# Individual additional packages to install
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d-i pkgsel/include string openssh-server tftp-hpa software-properties-common python-apt python-pycurl python-setuptools
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# Whether to upgrade packages after debootstrap.
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# Allowed values: none, safe-upgrade, full-upgrade
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d-i pkgsel/upgrade select full-upgrade
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# Language pack selection
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d-i pkgsel/language-packs multiselect en
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# No language support packages
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d-i	pkgsel/install-language-support	boolean false
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# Policy for applying updates. May be "none" (no automatic updates),
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# "unattended-upgrades" (install security updates automatically), or
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# "landscape" (manage system with Landscape).
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d-i pkgsel/update-policy select unattended-upgrades
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# Verbose output and no boot splash screen
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d-i	debian-installer/quiet	boolean false
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d-i	debian-installer/splash	boolean false
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### Boot loader installation
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# This is fairly safe to set, it makes grub install automatically to the MBR
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# if no other operating system is detected on the machine.
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d-i grub-installer/only_debian boolean true
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# This one makes grub-installer install to the MBR if it also finds some other
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# OS, which is less safe as it might not be able to boot that other OS.
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d-i grub-installer/with_other_os boolean true
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# Wait for two seconds in grub
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d-i	grub-installer/timeout string 2
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# Use the following option to add additional boot parameters for the
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# installed system (if supported by the bootloader installer).
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# Note: options passed to the installer will be added automatically.
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# d-i debian-installer/add-kernel-opts string vga=normal nomodeset audit=0 intel_idle.max_cstate=0 processor.max_cstate=1 cgroup_enable=memory swapaccount=1
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### Finishing up the installation
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# Avoid that last message about the install being complete.
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d-i finish-install/reboot_in_progress note
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#### Advanced options
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### Running custom commands during the installation
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# d-i preseeding is inherently not secure. Nothing in the installer checks
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# for attempts at buffer overflows or other exploits of the values of a
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# preconfiguration file like this one. Only use preconfiguration files from
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# trusted locations! To drive that home, and because it's generally useful,
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# here's a way to run any shell command you'd like inside the installer,
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# automatically.
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# This first command is run as early as possible, just after
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# preseeding is read.
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#d-i preseed/early_command string anna-install some-udeb
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# This command is run immediately before the partitioner starts. It may be
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# useful to apply dynamic partitioner preseeding that depends on the state
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# of the disks (which may not be visible when preseed/early_command runs).
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#d-i partman/early_command \
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#       string debconf-set partman-auto/disk "$(list-devices disk | head -n1)"
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# This command is run just before the install finishes, but when there is
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# still a usable /target directory. You can chroot to /target and use it
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# directly, or use the apt-install and in-target commands to easily install
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# packages and run commands in the target system.
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#d-i preseed/late_command string \
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#    in-target tftp 172.16.0.1 -c get postpreseed.sh; \
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#    in-target chmod +x postpreseed.sh; \
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#    in-target /bin/bash -x postpreseed.sh; \
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#    in-target rm -f postpreseed.sh;
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</pre>
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<pre>
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root@c1:/var/lib/tftpboot/ubuntu-installer/amd64/boot-screens# cat txt.cfg
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default install
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label install
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	menu label ^Ubuntu Install
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	menu default
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	kernel ubuntu-installer/amd64/linux
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	append auto=true priority=critical vga=788 initrd=ubuntu-installer/amd64/initrd.gz locale=en_GB.UTF-8 kbd-chooser/method=gb netcfg/choose_interface=auto url=tftp://10.2.137.101/preseed.cfg
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label cli
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	menu label ^Command-line install
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	kernel ubuntu-installer/amd64/linux
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	append tasks=standard pkgsel/language-pack-patterns= pkgsel/install-language-support=false vga=788 initrd=ubuntu-installer/amd64/initrd.gz -- quiet 
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</pre>