IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 19 June 2013   (all times are UTC)

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00:29
<scholar216>
Has anyone found a case that can secure the cables so Eve can't walk by your public thin client and install a hardware keylogger?
00:29
I am thinking about the treatment room at your local doctor's office
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03:55
<map7>
alkisg, Do you get an error when resuming a session in x2go?
03:55
<alkisg>
Nope
03:56
Although I do that rarely, I usually use logout
03:57
<map7>
I've also heard this problem only happens when trying to reconnect within 5 minutes of suspending
03:57
So it's awkward to test
03:57
<alkisg>
Hm, I don't think I tried that, I used "resume session" only a couple of times, and it was hours later....
03:58
<map7>
If it's easy for you to test could you give it a go?
03:58
Login, suspend, then try and resume within 5 minutes
03:59* alkisg is a bit too busy until next week, to try stuff...
03:59
<map7>
Other than this one issue X2Go looks great
03:59
<alkisg>
But you could talk about it in the x2go mailing list...
03:59
<map7>
That's cool
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06:31
<Enslaver>
Hola all
06:33
Sorry i've been awol for a while, kinda lost my job and have been a bit down.
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07:44
<Hyperbyte>
Enslaver, you 'kinda' lost your job? :o
07:44
What does that mean?
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08:13
<Burned1>
hi all o/
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09:02
<Hyperbyte>
Burned1, hi
09:34
<Gremble>
Error: Exported device is too big for
09:34
me. Get 64-bit machine :-(
09:34
<Burned1>
hello!
09:34
<Gremble>
^ what's that all about then?
09:35
seems there's an issue with the nbi.img appears much bigger than it actually is
09:35
http://www.mail-archive.com/nbd-general@lists.sourceforge.net/msg01019.html
09:35
this post suggest the fix is fairly simple, but I don't know how to implement it in the LTSP install I have
09:38
anyone else had this?
09:40
I've a 64-bit host with a 32-bit client, and have built the client as 32-bit
09:41
its Debian wheezy system
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09:53
<Joanet>
Hi all. I'm having random client hangs at my lab. IT has 12 computers running as thin clients connecting to Edubuntu+LTSP installed over VMWare. All my network is running at 100Mbps. Is there any way to speed up LTSP to avoid client hangs?
09:53
I know I have to move to Gigabit, but no money at the moment :)
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09:55
<markit>
Joanet: clients should not hang, just run slower if is a bandwidth problem (that you can mitigate with 2 nic in bound from your ltsp to the switch)
09:56
probably ltsp vm is hanging...
09:56
btw, why using proprietary program for virtualization? have a look at Proxmox project
09:56
free yourself ;P
09:57
<Joanet>
markit: when some client get hanged, the rest of the client still remain working, but I have to push the client power button to switch it off and start it again, and it works like a charm...
09:57
also, I'm running Vmware hypervisor, the free version
09:57
<markit>
Joanet: is gratis, not Free(dom)
09:58
they should pay you to be enslaved ;P
09:58
<Joanet>
i know i know :)
09:58
<markit>
Joanet: seems a connection problem then, maybe nic hangs? Cabling badly connected? Video driver hangs?
09:58
memory corrupted?
09:59
have you run extensive (memtest) tests on the clients? I discovered some with bad RAM banks when I did with old hardware
09:59
or the switch hangs... latest firmware? well cooled?
09:59
it could be anything
10:00
<Joanet>
I'm running pentium 4 computers... perhaps the memory is not fine...
10:00
old computers...
10:01
<markit>
I've a lab with 20 P4, were working as thin, now expanded to 1.5gb and work as fat
10:01
<Joanet>
I'll do a memory check, but I think the problem is network-related because as soon as the connected computers number grows they start to fail
10:02
and also, randomly
10:02
aure you using gig o 100m?
10:03
also, did you customize anything in ltsp.conf?
10:06
markit: how can I check if i'm having video driver problems?
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10:10
<alkisg>
Joanet: which graphics card on the client? lspci -nn -k | grep -A 2 VGA, on a localxterm
10:10
!localxterm
10:10
<ltsp`>
localxterm: Any applications that you launch on a thin client actually runs on the server, not on the client itself. If you want to open a program on the client locally, you can type 'ltsp-localapps <program>' in a run dialog or in a terminal. For example, 'ltsp-localapps xterm' to open a terminal running on the client.
10:11
<Joanet>
alkisg: thanks. I'll check it now
10:11
alkisg: also, when I try to use Epoptes the clients start to hang
10:12
<alkisg>
Joanet: do they also hang if they're not logged in?
10:12
If you have epoptes installed, you can very easily benchmark your network...
10:12
http://www.epoptes.org/documentation/lan-benchmark
10:14
<Joanet>
alkisg: I think they only get hanged when they are logged, but I cannot tell if it is really really true
10:14
<alkisg>
Can you boot all your clients now and leave them at the login prompt, and try a few things from the server via epoptes?
10:15
<Joanet>
using 100mbit and thin clients, what is the maximum number of clients?
10:15
alkisg: I can do it
10:15
<markit>
back, reading
10:16
<Joanet>
what do you want to do? Now I cannot run them because some computers are being used
10:16
<alkisg>
With 100mbit and thin clients, and depending on the usage and your definition of "acceptable performance", maybe up to 5... but you should really use either trunking (bonding) or a switch with at least 1 gigabit port
10:17
First, from epoptes, right click on one click and then go to 'execute > open terminal > root, locally'
10:17
There, run: lspci -nn -k | grep -A 2 VGA
10:17
...and paste the output here (select, and then middle click here to paste)
10:17
<markit>
Joanet: in lts.conf I did LDM_DIRECTX=True and X_SMART_COLOR_DEPTH=False and X_COLOR_DEPTH = 24 and LDM_LIMIT_ONE_SESSION=True
10:17
hi alkisg :) how are you?
10:18
<alkisg>
Hi markit! All fine, although quite busy! You?
10:19
<Joanet>
alkisg: I have to go to the lab. I'll connect from there and paste the results.
10:20
<alkisg>
ok
10:20
<markit>
the same :) Only troubles this year with ltsp lab at elementary schols has been the printer, so great success (but I need to understand that issue for the new year)
10:20
<Joanet>
markit: I'll also check the settings
10:20
moving... see you in 5 minutes
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10:32
<Joanet>
Hi again.
10:33
<alkisg>
(01:17:11 μμ) alkisg: First, from epoptes, right click on one click and then go to 'execute > open terminal > root, locally'
10:33
(01:17:19 μμ) alkisg: There, run: lspci -nn -k | grep -A 2 VGA
10:33
(01:17:29 μμ) alkisg: ...and paste the output here (select, and then middle click here to paste)
10:33
*on one client
10:33
<Joanet>
alkisg: now I have all computers started waiting for login, and logged only on one client
10:33
now I'll do the tests
10:33
<alkisg>
Let's check the vga first, and then you'll do a network benchmar
10:33
k
10:35
<Gremble>
I'm still getting this boot up problem, anyone else get it?
10:38
<Joanet>
alkisg: I get no prompt when socat window is opened...
10:38
<alkisg>
Joanet: try it again a couple of times
10:39
Gremble: grep -rv '^#' /etc/nbd*
10:39
Put the result to pastebin
10:39
<Gremble>
alkisg, on host or client?
10:40
alkisg, host of course, sorry
10:40
<alkisg>
Gremble: host
10:40
<Gremble>
:)
10:40
<Joanet>
alkisg: launched 4 times, but no prompt on any of 4 socat windows
10:41
<alkisg>
Hmmm...
10:41
<Joanet>
I can launch xterm locally, but not using epoptes
10:41
<alkisg>
Joanet: ...try the other option, root, remotely
10:41
<Gremble>
alkisg, http://pastebin.com/JKSGmYMd
10:41
<alkisg>
Gremble: are you using the greek schools ppa?
10:42
Ah, wheezy, never mind
10:42
Why are you using nbd for wheezy, instead of the default nfs?
10:42
<Gremble>
well, its running on vserver
10:42
<Joanet>
alkisg: using root remotely no window is shown
10:43
<alkisg>
Joanet: look on the client for the window, not on the server
10:43
<Gremble>
is not NBD a good option with some advantages alkisg ?
10:43
<alkisg>
No windows there either?
10:43
Gremble: nbd offers a bit better disk speed, but for thin clients it doesn't matter much
10:43
<Joanet>
no window :(
10:43
<alkisg>
If you're using many localapps or fat clients, then it makes more sense to switch to nbd...
10:43
<Joanet>
do you want to use localapps?
10:44
<Gremble>
alkisg, I've just spotted this:
10:44
Jun 19 11:42:49 platinum nbd_server[28997]: Unauthorized client
10:44
damn
10:44
<alkisg>
Gremble: you should *not* have an /etc/ltsp/nbd-server.allow file, check for it
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10:45
<Gremble>
I created it :(
10:45
<alkisg>
Joanet: can we share your server screen? I'd like to see the epoptes issue... x11vnc -connect plinet.ioa.sch.gr from the server
10:45
<Joanet>
now i'm rebooting the client
10:48
<alkisg>
Joanet: you didn't install epoptes-client in the chroot, that was the issue
10:48
So you don't see the clients before login
10:49
Put the "trans" password there, and press enter
10:52
Joanet: when ltsp-update-image finishes, reboot your clients
10:52
Gremble: (delete the file and reboot the clients, are they ok now?)
10:52
<Joanet>
alkisg:
10:53
alkisg: all of them?
10:53
<alkisg>
Joanet: yes, except maybe for those that have people working on them
10:53
<Gremble>
alkisg, thankyou
10:53
that works now
10:53
GNOME3 going to fallback mode, which is fine
10:54
<Joanet>
alkisg: ok, i'll reboot them now
11:00
<alkisg>
Joanet: meh we needed iperf in the chroot too... we'll reboot them again via epoptes once ltsp-update-image finishes
11:00
Your graphics cards are intel 8xx, with very bad drivers
11:00
It's possible that you do have graphics problems... using a newer xorg might help
11:01
Joanet: did you reboot/disconnect the clients? or the networking failed?
11:01
<Joanet>
i'm disconnecting them
11:02
now I'll reboot again
11:02
<alkisg>
We could reboot all of them with 1 epoptes click :)
11:03
<Joanet>
although any of them have logged?
11:04
<Burned1>
alkisg, can you help me to create a share for ltsp users, with r/w access only to the corresponding directory?
11:04
sorry for my eng :(
11:04
<alkisg>
Joanet: yup, without caring if they're logged in or not
11:05
<Joanet>
before I cannot se them until they logged...
11:05
<alkisg>
Burned1: that's not an ltsp issue... try your #distro channel, or wait in case someone wants to give feedback here
11:05
Joanet: that's because you didn't read epoptes.org/installation, you didn't have epoptes-client in the chroot
11:05
<Burned1>
uhh :(
11:05
<alkisg>
OK let's check your LAN...
11:05
<Joanet>
alkisg: all clients started
11:07
<alkisg>
Joanet: your networking sucks, each client gets only 5-10 mbps while it should be getting 50-100, but other than that, it's stable
11:07
Log in some client...
11:07
<Joanet>
logged
11:08
I know my network is very slow... but now my boss has no money...
11:12
<alkisg>
Joanet: ok, tests ended :)
11:12
1) switch to fat clients
11:13
2) You might want to switch to gnome-fallback for stability
11:13
3) If after those, clients continue to have issues, install xorg-quantal instead of xorg-precise (ask me for that)
11:13
(1) will make your clients run MUCH better
11:14
Most have 1 gb RAM... so it's fine for fats
11:14
And requires less network bandwidth
11:14
!fatclients
11:14
<ltsp`>
fatclients: You may find some info about the Ubuntu/LTSP implementation of fat clients at https://help.ubuntu.com/community/UbuntuLTSP/FatClients
11:14
<alkisg>
!ltsp-pnp
11:14
<ltsp`>
ltsp-pnp: ltsp-pnp is an alternative (upstream) method to maintain LTSP installations for thin and fat clients that doesn't involve chroots: https://help.ubuntu.com/community/UbuntuLTSP/ltsp-pnp
11:14
<Joanet>
do you think if I update to gigabit for the server I can get better performance?
11:14
<alkisg>
(the second is much easier)
11:15
If you upgrade the server and the switch so that there's a gigabit connection between them,
11:15
then, as fast as ONE client goes now when all others are turned off,
11:15
with gigabit, ALL your clients will go with the same speed
11:15
I.e. about 10 times faster than it is now...
11:16
It's 60 € for a gigabit switch with 1 gigabit port
11:16
...and also do switch to fat clients
11:16* alkisg closes VNC...
11:18
<Joanet>
alkisg: and what about intel driver?
11:18
<alkisg>
For the intel driver you can only try (3), but that's for later...
11:19
<Joanet>
network team is looking for a Cisco 10/100 24ports switch with 2 gigabit ports
11:19
for connecting the server to one of the gig ports
11:19
<alkisg>
That's 10 times more expensive... but if you have money for that, ok
11:19
Your first task should be to switch to fat clients
11:20
<Joanet>
not buying, recycling
11:20
<alkisg>
Read about ltsp fat clients, and about ltsp-pnp, and decide which way to go
11:20
<Joanet>
fat clients before trying gigabit?
11:20
<alkisg>
Yes
11:20
You'll get really better performance with them, even on 100 mbps
11:20
And quite possibly more stability
11:21
After you do fat clients, _then_ check again for the intel driver issues...
11:21
<Joanet>
ok, i'll try to convert them to fat
11:21
<alkisg>
It's just a matter of generating the appropriate chroot.
11:32
<Joanet>
alkisg: THANKS
11:32
<alkisg>
You're welcome :)
11:33
<Joanet>
i'll let you know as soon as I get fat clients
11:38alkisg is now known as work_alkisg
11:45
<Hyperbyte>
!alkisg
11:45
<ltsp`>
alkisg: The LTSP oracle. Our beacon of hope in the world of LTSP. With the guidance of this divine emperor, we shall prevail.
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15:35
<Burned1>
hi! how i can install the flash plugin for thinclient? i installed it on the server using ubuntu software center but clients doesn't use it....
15:36
where is the mistake?
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