UbuntuHelp:UbuntuLTSP/iTalc
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目录
Installation and Operation of iTALC in the Ubuntu LTSP environment
(Note: If you are running Jaunty and only need iTALC installed on the server (not client install as described below) it is easiest to simply type in Terminal: 'sudo apt-get install italc-master'--it just works!) iTalc is a helpful utility allowing for viewing and remote-control of computers. In this instance we will cover installation in a thin-client environment. There are two methods of installation - Server-side and in the thin-client chroot. Server-side has the advantage of being simpler to setup and uses less RAM on the thin client. Installation in the thin-client chroot allows for control of clients prior to login; server-side does not. Read more about iTALC: http://italc.sourceforge.net/home.php
Installation on the server
sudo aptitude install libitalc italc-client italc-master
Thin clients must log in post-installation to be seen (re-login any existing clients). Start iTalc with
Applications->System Tools->iTalc
When running the iTalc master while logged in as a user on a thin client, iTalc will overwrite your settings and automatically add any LTSP clients it finds to a classroom called 'LTSP'. You may temporarily add thin-clients to your setup by selecting 'Classroom Manager' from the left-most tabs, then right-clicking and selecting 'Add Computer'. The IP/Hostname field should be entered as $SERVERIP:10???, where $SERVERIP is your server's IP (When dealing with servers with multiple NICs you should enter the IP of the NIC serving the subnet of the client you wish to add), and ??? is the last-three digits of the thin client's IP. For example, for server 192.168.1.1 and thin client 192.168.1.250, you should enter the address as:
192.168.1.1:10250
If you are experiencing only having access to the last session logged in when trying to manager your LTSP users, please visit: https://bugs.launchpad.net/ubuntu/+source/italc/+bug/361404 for the relevant fix.
If you would like persistent settings, see the section below titled 'Keep iTALC settings persistent'
Installation in the client chroot
Add new source for iTALC and update chroot
In this document we use Edubuntu iTalc devel team's personal package archive. Add these lines to the /etc/apt/sources.list file and then first update server side usual way.
deb http://ppa.launchpad.net/edubuntu-italc-devel/ubuntu hardy main deb-src http://ppa.launchpad.net/edubuntu-italc-devel/ubuntu hardy main
sudo apt-get update sudo apt-get dselect-upgrade
After that update chroot environment.
sudo mount --bind /dev /opt/ltsp/i386/dev sudo mount -t proc none /opt/ltsp/i386/proc
sudo cp /etc/apt/sources.list /opt/ltsp/i386/etc/apt/sources.list sudo cp /etc/resolv.conf /opt/ltsp/i386/etc/resolv.conf
sudo chroot /opt/ltsp/i386 apt-get update apt-get dselect-upgrade
exit
Add iTALC client in the chroot
Add only italc-client package, not italc-master in the chroot.
sudo chroot /opt/ltsp/i386
apt-get install italc-client [--] Creating teacher keypair Creating admin keypair Creating supporter keypair Installing ldm rc script [--]
exit
Add iTALC master in the server
Add italc-master usual way in the server.
sudo apt-get install italc-master [--] Creating teacher keypair Creating admin keypair Creating supporter keypair [--]
You'll also need to modify your lts.conf file to append the following parameter (which is necessary for starting iTalc in the chroot):
START_ITALC = True
Before using iTALC your final step is update image for your thin clients. If you don't use i386 thin clients, replace 'i386' below with your architecture
sudo ltsp-update-image --arch i386
After these steps it is good idea remove Vinagre, it uses VNC, too. You can add Vinagre back when you first are sure that iTALC works well.
Notes
Keep iTALC settings persistent
iTALC looses it's configuration (classrooms and clients) every time you start it. So you have to make permanent configuration for your classroom. Read this first: http://italc.sourceforge.net/wiki/index.php?title=Customizing_paths_to_keys_and_config-files Create new directory under /etc/italc.
cd /etc/italc sudo mkdir configfiles
Copy your final and full globalconfig.xml file in that directory.
sudo cp ~/.italc/globalconfig.xml /etc/italc/configfiles
Modify italc.conf file, add these lines in the italc.conf.
sudo nano /etc/xdg/iTALC\ Solutions/iTALC.conf
[paths] globalconfig=/etc/italc/configfiles/globalconfig.xml
Make globalconfig.xml file read-only to the world.
sudo chmod 755 /etc/italc/configfiles/globalconfig.xml
Multiple servers
For multiple LTSP servers, you will need to have identical SSH keys on each of the servers. Recursively copy the /etc/italc/keys tree to each server of thin clients you wish to access:
scp -r /etc/italc/keys USER@server2:/etc/italc/
Use fixed ip numbers for iTALC
If you have trouble finding the client you wish, you may want to use static IPs. You can set static IPs in your dhcpd.conf file.
Screenshots about using ITALC
1. Send text message
2. Direct support
3. Viewing
4. Run commands
5. Lock/Unlock desktops
5. Fullscreen Demo
Back to the UbuntuLTSP: https://help.ubuntu.com/community/UbuntuLTSP
