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{{From|https://help.ubuntu.com/community/UbuntuLTSP/iTalc}} {{Languages|UbuntuHelp:UbuntuLTSP/iTalc}} {|border="1" cellspacing="0" |This page is specific to Ubuntu versions 8.04 |} ''If you find this information applicable to additional versions/releases, '''''please''''' edit this page and modify this header to reflect that. Please also include any necessary modifications for this information to apply to the additional versions.'' ---- == 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 === <pre><nowiki> sudo aptitude install libitalc italc-client italc-master </nowiki></pre> Thin clients must log in post-installation to be seen (re-login any existing clients). Start iTalc with <pre><nowiki> Applications->System Tools->iTalc </nowiki></pre> 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: <pre><nowiki> 192.168.1.1:10250 </nowiki></pre> ---- ''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. <pre><nowiki> deb http://ppa.launchpad.net/edubuntu-italc-devel/ubuntu hardy main deb-src http://ppa.launchpad.net/edubuntu-italc-devel/ubuntu hardy main </nowiki></pre> <pre><nowiki> sudo apt-get update sudo apt-get dselect-upgrade </nowiki></pre> After that update chroot environment. <pre><nowiki> sudo mount --bind /dev /opt/ltsp/i386/dev sudo mount -t proc none /opt/ltsp/i386/proc </nowiki></pre> <pre><nowiki> sudo cp /etc/apt/sources.list /opt/ltsp/i386/etc/apt/sources.list sudo cp /etc/resolv.conf /opt/ltsp/i386/etc/resolv.conf </nowiki></pre> <pre><nowiki> sudo chroot /opt/ltsp/i386 apt-get update apt-get dselect-upgrade </nowiki></pre> <pre><nowiki> exit </nowiki></pre> ==== Add iTALC client in the chroot ==== Add '''only''' italc-client package, not italc-master in the chroot. <pre><nowiki> sudo chroot /opt/ltsp/i386 </nowiki></pre> <pre><nowiki> apt-get install italc-client [--] Creating teacher keypair Creating admin keypair Creating supporter keypair Installing ldm rc script [--] </nowiki></pre> <pre><nowiki> exit </nowiki></pre> ==== Add iTALC master in the server ==== Add italc-master usual way in the server. <pre><nowiki> sudo apt-get install italc-master [--] Creating teacher keypair Creating admin keypair Creating supporter keypair [--] </nowiki></pre> You'll also need to modify your lts.conf file to append the following parameter (which is necessary for starting iTalc in the chroot): <pre><nowiki> START_ITALC = True </nowiki></pre> 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 <pre><nowiki> sudo ltsp-update-image --arch i386 </nowiki></pre> 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. <pre><nowiki> cd /etc/italc sudo mkdir configfiles </nowiki></pre> Copy your final and full globalconfig.xml file in that directory. <pre><nowiki> sudo cp ~/.italc/globalconfig.xml /etc/italc/configfiles </nowiki></pre> Modify italc.conf file, add these lines in the italc.conf. <pre><nowiki> sudo nano /etc/xdg/iTALC\ Solutions/iTALC.conf </nowiki></pre> <pre><nowiki> [paths] globalconfig=/etc/italc/configfiles/globalconfig.xml </nowiki></pre> Make globalconfig.xml file read-only to the world. <pre><nowiki> sudo chmod 755 /etc/italc/configfiles/globalconfig.xml </nowiki></pre> ==== 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: <pre><nowiki> scp -r /etc/italc/keys USER@server2:/etc/italc/ </nowiki></pre> ==== 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 http://www.arkki.info/howto/iTalc/02.png http://www.arkki.info/howto/iTalc/10.png 2. Direct support http://www.arkki.info/howto/iTalc/03.png http://www.arkki.info/howto/iTalc/04.png 3. Viewing http://www.arkki.info/howto/iTalc/05.png 4. Run commands http://www.arkki.info/howto/iTalc/06.png http://www.arkki.info/howto/iTalc/07.png 5. Lock/Unlock desktops http://www.arkki.info/howto/iTalc/09.png 5. Fullscreen Demo http://www.arkki.info/howto/iTalc/11.png ---- Back to the UbuntuLTSP: https://help.ubuntu.com/community/UbuntuLTSP ---- [[category:UbuntuHelp]]
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