LTSP How To
Upstream documentation with official, detailed information about installing LTSP is at http://wiki.ltsp.org/wiki/LTSPedia.
Installing LTSP on Jessie
1. The version of LTSP employed here is 5.5.2-1. This first model has much less flexibilty since the clients must run the same version of distribution and platform as the server. The upside is that the model is easier to maintain. Thus a 32bit version (Jessie i386) is suggested. There is no separate chroot (sometimes referred to as ltsp-pnp) and nbd (rather than nfs) is used to provide a squashfs image.
steps are labelled with a b c etc.
a. Update the server, ensure the ip(s) is/are as desired (static is recommended) and /etc/hosts is as desired.
b. Check to see if the loop module is installed. If not add a line with the word loop to /etc/modules and reboot the server.
c. Install ltsp-server-standalone, ltsp-client (since there is to be no separate chroot) dnsmasq (an easy to configure tool) other desired software and the desktop environment of your choice.
d. On the commandline run as root
- ltsp-config dnsmasq
This creates a default config file /etc/dnsmasq.d/ltsp-server-dnsmasq.conf
e. If the server will run one subnet containing the Internet connection and the clients it need have only one network interface card. In this case dnsmasq can be configured to run a dhcp-proxy if there already is another dhcp server active. In this case edit the above file to comment out the dhcp range line and ensure there is a line (uncommented) stating dhcp-proxy.
f. If the server will also run a dhcp-server then comment out the dhcp-proxy line and leave the dhcp-range line uncommented, ensuring the subnet entries are correct.
g. On the commandline run as root
- service dnsmasq restart
h. Edit the config file /etc/ltsp/update-kernels.conf to have the uncommented lines:
- BOOT_METHODS=NBD IPAPPEND=3
i. Inspect and edit as desired /etc/ltsp/ltsp-update-image.excludes as some software running on the server will not be appropriate for the clients.
j. On the commandline run as root
- ltsp-update-image --cleanup /
This creates the squashfs image at /opt/ltsp/images used by nbd and takes an appropriate subset of what the actual server is running. Hence the config file in step i.
k. On the commandline run as root
- ltsp-config nbd-server
This creates 3 files: /etc/nbd-server/conf.d/swap.conf /etc/nbd-client and /etc/nbd-server/conf.d/ltsp_i386.conf.
If there is an error message "FATAL: Module overlayfs not found" it is a non-issue since aufs is used instead of overlayfs.
l. On the commandline run as root
- service nbd-server restart
Create users as appropriate for the clients
As this model describes a usage with nbd rather than Debian's default using nfs note that the useful file lts.conf is in/var/lib/tftpboot/ltsp/i386/ which among other things means that changes made to this file do NOT require a re-creation of the squashfs image.
Installing LTSP on Lenny
If you want a complete LTSP server with all the bells and whistles:
apt-get install ltsp-server-standalone
If you want more fine-grained control, splitting some services off to separate servers, you can install ltsp-server instead, and manually install each of the other services.
(you can also get backported packages for lenny: LTSP/Howto/Lenny-With-Backports)
Build the LTSP client environment:
ltsp-build-client uses the Internet to fetch packages.
In case you got backported packages at step 1., it is strongly recommended to use backports packages too to build client, or you may have incompatibilities (bad ldm version, login failed...). Please, use the following command:
ltsp-build-client \ --backports-mirror "http://backports.debian.org/debian-backports" \ --apt-key /etc/apt/trusted.gpg
In case your thin clients are old, please use the following parameter:
ltsp-build-client \ --arch i386
In case you have a slow Internet connection or want to use Local DVDs of Debian. Please use the following command:
ltsp-build-client --mirror file://mnt/Debian_Lenny_Bluray_Image.img --security-mirror none --accept-unsigned-packages
Since the ltsp-build-client uses more than one Debian DVD you would need to build a ?BluRay Image using the jigdo template of ?BluRay Disc. This Image location can be passed as the argument. The security-mirror-none option prevents updates from being downloaded. The accept-unsigned-packages allows the building to go on even using unsigned packages.
If you're installing a different Debian distribution than what's on the server, you will need to specify the --dist xxx commandline option. where xxx is your Debian distribution (e.g. lenny, squeeze). See /usr/share/debootstrap/scripts/ and the Debootstrap page.
ltsp-build-client will download a complete Debian filesystem into /opt/ltsp/i386 (or specify an alternate location with --base) and install the ltsp-client and ldm packages (the LTSP Display Manager). Typically, you will need a desktop environment like Gnome or Xfce, or a window manager such as icewm installed on the server (NOT in the chroot).
If you change the IP data after you have done the initial setup, run ltsp-update-sshkeys on the server. The files the client will boot are installed on the server into /var/lib/tftpboot.
- Configure /etc/dhcp3/dhcpd.conf and /etc/ltsp/dhcpd.conf: Edit /etc/ltsp/dhcpd.conf to adapt to your network. See examples in /usr/share/doc/ltsp-server/examples/dhcpd.conf as a reference.
Include the LTSP dhcpd.conf at the bottom of /etc/dhcp3/dhcpd.conf:
Take care at the next-server line, which specify the IP address of the TFTP server. Restart dhcp3-server:
invoke-rc.d dhcp3-server restartAlternately, configure /etc/dnsmasq.conf. See the example in /usr/share/doc/ltsp-server/examples/dhcpd-dnsmasq and adapt to your network.
invoke-rc.d dnsmasq restart
invoke-rc.d nfs-kernel-server restart
Now make sure that portmap is not started on the loopback interface only. Look into /etc/default/portmap and verify that there is no line saying
If there is such a line, comment it out by prepending a # character and restart portmap by:
invoke-rc.d portmap restart
Start tftpd. By default, tftpd-hpa is started from inetd. you may need to restart inetd after installing tftpd-hpa:
invoke-rc.d openbsd-inetd restart
Alternately, edit /etc/default/tftpd-hpa to have tftpd-hpa start on its own:
Then, comment the tftpd entry in /etc/inetd.conf:
#tftp dgram udp wait root /usr/sbin/in.tftpd /usr/sbin/in.tftpd -s /var/lib/tftpboot
invoke-rc.d openbsd-inetd restart
and restart tftpd-hpa:
invoke-rc.d tftpd-hpa restart
- Boot a PXE or Etherboot capable machine and enjoy. Note that some older versions of etherboot do not support ELF images, and may not work without additional configuration.
Customizations in the chroot
Two important configuration files inside the client are /var/lib/tftpboot/ltsp/i386/lts.conf (or /opt/ltsp/i386/etc/lts.conf for NFS) and /opt/ltsp/i386/etc/default/ltsp-client-setup. See the examples in /opt/ltsp/i386/usr/share/doc/ltsp-client*.
See also see the Edubuntu wiki http://doc.ubuntu.com/edubuntu/edubuntu/handbook/C/customizing-thin-client.html (note: Debian LTSP still uses NFS by default).