ltsp-update-image is used when you update the chroot, like when you:
- activate the root account, change it's passwd
- install ssh, vnc, etc. or any application in the chroot, that must be run
by
the thin client hardware
- do an apt-get uprade
- install a backported driver
- other cases
Thanks for the explanation. Guess this give me an oppurtunity to learn more
about chroot and LTSP. I am sorry if my questions sounds very basic. You
told me that ltsp-update-image is used when we make changes to chroot,
kindly tell me what is the correct procedure to install new applications for
LTSP clients. Say for example, i have to introduce JAVA for all LTSP
clients. I don't login as root at all, infact the root account is still
locked and i use the first user account created during installation and I do
sudo apt-get install or use the GUI tool to install applications like Java,
VNC etc.. and then run ltsp-update-image. Now, this updates the LTSP image
that is downloaded everytime a LTSP client boots, does this also mean that
the changes are made to chroot?
*Or should i install applications in chroot? what is the difference?* Coz,
when i install any new application on the server it reflects on the LTSP
client anyways even without running ltsp-update-image.
The thin-client doesn't mount anything.
Try thinking like this: When you ssh to your server, from your home, you can
mount and umount the
server's disk or partitions. Your computer doesn't mount anything on the
server.
> coz on the server some > other user account has logged in and his
permissions should be in
> place and not of the user account on LTSP client, isn't it?
But if you plug something on the server, if it is not yet mounted, any user
can mount it (if he is in the right group).
Something is not clear: who mount the usb stick ? only one user at a time
can mount it.
I am aware that LTSP client doesn't mount anything and everything happens on
the server. I am thinking in terms of security bcoz of the following.
Imagine I have logged in as user account *'abc'* on the server and i insert
a usb stick and this user 'abc' has complete privileges on this usb stick.
After this a user 'xyz' logs in from a LTSP client, how can the user account
'xyz' have write priviliges or the same rights on the USB stick inserted or
mounted by some other user that too on the server??? this is what is
happening on my server and LTSP clients? All the user accounts created are
on their default groups and no extra groups are added nor changed?
Thanks again
Avinash
On Fri, Aug 7, 2009 at 2:14 PM, Xavier Brochard <xav...@alternatif.org>wrote:
> Le vendredi 07 août 2009 10:18:55, Avinash Rao a écrit :
> > On Thu, Aug 6, 2009 at 3:11 PM, Xavier Brochard<xav...@alternatif.org>
> wrote:
> > > Le jeudi 06 août 2009 11:04:17, Avinash Rao a écrit :
> > >> 1) I installed LTSP using apt-get command and i have not configured or
> > >> edited lts.conf file. I just booted an LTSP client and it got the
> > >> basic desktop. where does LTSP take the client configuration from if
> > >> lts.conf file is not configured? Is it X11, a common configuration?
> > >> Will this affect the performance?
> > >
> > > Please have a look at the documentation. You'll find your answers here:
> > >
> > > - Chapter 14. X-Windows parameters
> > > http://www.ltsp.org/~sbalneav/LTSPManual.html#id2698612<http://www.ltsp.org/%7Esbalneav/LTSPManual.html#id2698612>
> > > extract:
> > > The thin client uses X.org's own auto configuration mode to let X
> > > determine what it thinks is installed in the box.
> > >
> > >> 2) Many a times i have noticed that, any changes made to the server
> > >> for example installing applications like thunderbird, Java etc..
> > >> reflect on the LTSP client immediately without doing a
> > >> ltsp-update-image? How is this possible? coz, the client boots the
> > >> compressed image and if i don't update the image of the changes, how
> > >> can it reflect the changes?
> > >
> > > Please have a look at the documentation. You'll find your answers here:
> > >
> > > - Introduction to LTSP and Thin Client Computing
> > > http://www.ltsp.org/~sbalneav/LTSPManual.html#intro<http://www.ltsp.org/%7Esbalneav/LTSPManual.html#intro>
> > > extract:
> > > 1. The thin client only takes care of the basic functions like display,
> > > keyboard, mouse and sound.
> > > 2. The server does the heavy weightlifting. All the applications run on
> > > the server, and they simply display on the thin client.
> > >
> > > - How LTSP Works
> > > http://www.ltsp.org/~sbalneav/LTSPManual.html#id2696486<http://www.ltsp.org/%7Esbalneav/LTSPManual.html#id2696486>
> > >
> > >> 3) Any USB stick inserted on the server, appears on all the LTSP
> > >> client, is this a bug? I have tried changing the user privileges, but
> > >> it still appears, how to stop this from happening?
> > >
> > > It is normal.
> > > You can see the clients as a screen/keyboard/mouse plugged into the
> > > server. Hence, it is normal to see everything happenning on the server.
> > > So, you see the USB stick on the desktop. Try opening it from one
> client:
> > > it is now mounted with the rights of the user connected on the client,
> > > like in any Linux/Unix workstation.
> >
> >
> > Thanks for the links, i have read that documentation.
> >
> > I am aware that all the processing is done on the server and the
> > client just gets an XDisplay with keyboard and mouse! Then what is use
> > of ltsp-update-image, if the changes are reflecting without updating
> > the image, then when do u use ltsp-update-image command?
>
> ltsp-update-image is used when you update the chroot, like when you:
> - activate the root account, change it's passwd
> - install ssh, vnc, etc. or any application in the chroot, that must be run
> by
> the thin client hardware
> - do an apt-get uprade
> - install a backported driver
> - other cases
>
> > If the thin-client just gives the display with Keyboard and mouse, why
> > should it mount usb's inserted on the server,
>
> The thin-client doesn't mount anything.
> Try thinking like this:
> When you ssh to your server, from your home, you can mount and umount the
> server's disk or partitions. Your computer doesn't mount anything on the
> server.
>
> > coz on the server some
> > other user account has logged in and his permissions should be in
> > place and not of the user account on LTSP client, isn't it?
>
> But if you plug something on the server, if it is not yet mounted, any user
> can mount it (if he is in the right group).
>
> Something is not clear:
> who mount the usb stick ? only one user at a time can mount it.
>
> > I am sorry
> > if this is sounding very basic. This sounds like a security hole, what
> > if the administrator wants to use USB sticks on the server? coz i
> > tried opening the usb sticks connected to the server on the client and
> > it works!!
>
> It's not opened on the client, but on the server. You opened it from a
> server's user account. Even if that user login from a client: users are
> allways logged in on the server.
> In other words:
> It doesn't change if the user is logged in to the server from a client.
>
> > Me just discussing, thanks a ton
>
> you welcome
>
> Xavier
> xav...@alternatif.org
>
>
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