How do LTSP Fat Clients work?// November 24th, 2010 // Education, Free Software

What are LTSP Fat Clients anyway‽Thin clients are a great way to lower initial deployment as well as running costs in classrooms,

libraries and similar organisations, but they have some limitations, especially when it comes to

graphical and CPU intensive software. Even playing a video on one or more thin clients can often be

enough to drag the network performance to crawling speeds. In recent LTSP versions, it became

possible to run some applications locally, making it possible to use the local CPU/GPU/memory and

drastically improve performance all-round. Since LTSP 5.2.1 (that ships with Ubuntu 10.04), it’s been

possible to also run everything locally. This essentially makes a terminal a complete fat client that

simply uses the network as a storage device. It combines many of the benefits of thin clients and fat

clients, while also requiring a less powerful server since it basically becomes just a file server.

Installation is easyStep 1: Install the ltsp-server-standalone packageInstall it from the command line using apt-get install ltsp-server-standalone or by installing it from the

Ubuntu Software Centre. If you’d like to configure a DHCP server seperately, then you should use the

ltsp-server package instead.

Step 2: Configure your networkingLTSP will work out of the box if you have an interface configured on the 192.168.0.0/24 range. If you

would like to use another IP range, you will have to edit /etc/ltsp/dhcpd.conf and adjust it to your

needs. Usually LTSP is run from a separate network interface that connects to the rest of the network.

If it’s not yet configured, you can add the configuration for a second interface to the

/etc/network/interfaces file. Example:

auto eth1iface eth1 inet staticaddress 192.168.0.254netmask 255.255.255.0

Step 3: Build Fat Client ImageAn LTSP fat client image can be used for both thin clients and fat clients alike. This is useful if you

have a mixture of newer, more powerful machines as well as very old machines that can be used as

thin clients only.

ltsp-build-client --fat-client --fat-client-desktop edubuntu-desktop --arch i386 --skipimage

Edubuntu-desktop can also be replaced with kubuntu-desktop, ubuntu-desktop  or xubuntu-desktop.

The Edubuntu one is probably most tested though. It’s recommended that you use the i386

architecture for the thin client environment (you can do this even if your server is amd64), the reason

for this is that many machines (such as Intel Atom based thin clients) are not 64bit capable. The

skipimage switch will prevent the image from being built now, since we want to install other software

on it first. You can get all ltsp-build-client options by entering “ltsp-build-client –extra-help”.

chroot /opt/ltsp/i386 apt-get install htop openarena stellarium vlc

The example above will change-root to the ltsp environment and install htop, openarena, stellarium

and vlc. These are just examples, you can choose any other software that you intend to run on your

LTSP fat client. Next, sync the ssh keys (used for logins) and update the LTSP image:

ltsp-update-sshkeysltsp-update-image

Step 4: Restart ServicesRestart networking:

/etc/init.d/networking restart

Restart the DHCP server:

/etc/init.d/dhcp3-server restart

That’s it, your LTSP Fat client server is now installed and ready for use. All you need to do now is

connect one or more machines to the configured network and set them to boot from PXE or

Etherboot.

Frequently Asked Questions

1. Does this take up a lot of RAM on the workstations? Does it take long for the initial image to download?The diskless workstation will use the LTSP image in a similar way as a local hard disk and will only

read the information over the network as required. It doesn’t download the whole image at boot time,

so it doesn’t slow down the boot process by installing more software and it doesn’t use any additional

RAM either.

2. How do I set a machine to be a thin client instead of a fat client?Create a file called /var/lib/tftpboot/ltsp/i386/lts.conf if it doesn’t exist already. lts.conf is the

configuration file for LTSP. The [default] section contains settings that apply to all machines on the

network. You can specify exceptions to this by specifying the mac address between brackets:

[default]    LDM_DIRECTX=true

[00:A1:08:EB:43:27]    LTSP_FATCLIENT=false

LDM_DIREXTX disables SSH encryption of thin client sessions. It is insecure, but boosts

performance and might be required for very old machines or of you have limited CPU power on the

server. The machine with the MAC address 00:A1:08:EB:43:27 will function as a thin client instead of

a fat client. For more settings available in lts.conf, refer to the manual page.

3. Edubuntu integrates with LTSP, why not also DRBL?DRBL is an alternative to LTSP that does diskless fat clients only. LTSP already matches all the

functionality of DRBL, and on top of that supports multiple architectures, mixed thin/fat environments,

individual client configuration as well as being properly packaged in Debian and Ubuntu already.

Spending more valuable resources on supporting DRBL in Edubuntu wouldn’t bring any benefit to any

of our users, although if someone wants it really badly, we’ll be happy to review any packages that

they submit through the usual process.

4. Hardware is getting really cheap, is there still a future for LTSP?The cool kids these days walk around with dual-core ARM based devices with 2GB of RAM in their

pockets. With computing becoming so ubiquitous, does it make sense for schools and other

organisations to still make use of LTSP? I’m quite sure that the way we use computers over the next

few years is going to change drastically, but for now LTSP still offers a great way to cut down on

administration and maintenance costs with very little compromise.

5. What effect will Wayland have on LTSP thin clients?LTSP uses the X Window System to display applications that run on a remote application server. The

X Window System is planned to be replaced by Wayland in the near future. Wayland offers better and

simpler means to write new software on top of it, which will allow developers to write great software

faster and with less trouble than before. In order to achieve this simplicity, Wayland had to drop the

network transparency features that is present in the X Window System. This will certainly bring on

some required changes on how LTSP is implemented, but at least there are already some options

available that the LTSP team will investigate, and there’s no reason why Wayland should mean an

end to LTSP.

Want to know more? Just ask! ltsp-discuss  – General LTSP related help and support mailing list

Edubuntu  ships with an LTSP Live mode that you can try from the Live CD before

installing if you’d like to try it out. The Edubuntu documentation page may also be useful.

edubuntu-users  – Edubuntu users mailing list, feel free to use it for LTSP related issues on

Edubuntu