/etc/initramfs-tools/conf.d/ltsp is in mythbuntu-diskless-client 0.9-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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BOOT="mythbuntu_nbd"
# MINRAM: if we have less than $MINRAM kB of RAM, we'll add swap
# Default is 49152
# Note: can be overridden with minram= at boot time
MINRAM="327680"
# WOLADDRESS: MAC address (aa:bb:cc:dd:ee:ff notation) of the box you
# want to wake up
# Note: etherwake has to be installed
# Note: can be overridden with wol=aa:bb:cc:dd:ee:ff boot option
# WOLADDRESS=
# OVERLAY can be set to "tmpfs" to use the default behaviour of writing
# all changes to tmpfs or you can specify:
# * a NFS share prefixed with "nfs="
# * "nfs" or "NFS" to auto-detect the NFS share which is to be used
# (NFS server will be the nbdroot server, path will be "/var/cache/mythbuntu-diskless/overlay/")
# * or a block device, eg /dev/sda1 (will be
# interpreted by mount, UUID might work as well)
#
# Note: can be overridden with overlay= boot option
# Note: default is "tmpfs"
# Note: If you're going to use NFS, it's recommended you set UNIONTYPE="aufs"
# Examples:
# OVERLAY="/dev/sda1/"
# OVERLAY="nfs=192.168.0.1:/my/share/"
OVERLAY="NFS"
# OVERLAYKEY: valid options: "MAC", "HOSTNAME" or any string of your choice
# A new directory will be created inside the file system described by OVERLAY.
# Its name will either be the MAC address of the NIC used to bring up your
# system ("MAC"), the hostname ("HOSTNAME") (as given out by your dhcpd or
# as specified using the ip= boot option) or any other string you might
# have entered here.
# All changes you will make to the root file system will be preserved in this
# directory and they'll be available even after reboots. That's the plan
# at least, so make sure your backups are up to date.
# Note: can be overridden with overlaykey= boot option
# Note: this option is not used with OVERLAY=tmpfs to preserve default behavior
# Note: OVERLAYKEY defaults to "MAC"
# Note: If you're using MAC, colons will stripped from the MAC address
OVERLAYKEY="MAC"
# UNIONTYPE: which stacking file system do you want to use
# Defaults to unionfs if not set
# valid choices: "aufs", empty
# Note: can be overriden with union= boot option
UNIONTYPE="aufs"
# HOSTNAMEOVERRIDE: set the hostname of the client to the overlay key
# If $OVERLAYKEY is used and you set this option to "true",
# the host name of the client will be set to the string represented by
# $OVERLAYKEY (eg OVERLAYKEY="MAC" will set the host name to the MAC address
# without colons)
# Valid choices: "true", empty
# Note: can be overriden with hostnameoverride= boot option
HOSTNAMEOVERRIDE="true"
# DHCPPORT: tell ipconfig from klibc-utils) to use an alternate DHCP port
# Default: 68
# example: if you want to use alternate DHCP ports, use something like
# DHCPPORT="1068"
# this variable can be overridden using the dhcpport= boot option
# Your DHCP server will have to listen on $DHCPPORT - 1
# Note: for alternate DHCP ports, see
# http://www.mail-archive.com/ltsp-discuss@lists.sourceforge.net/msg31182.html
# That mail might be a bit outdated but it still gives a nice overview
# DHCPPORT=""
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