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markit, no, I haven't heard that issue
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alkisg: I have to reboot clients to see new NBD image, right? But what happens if I don't reboot? Will they see old image / corrupted image / crash?
I mean, if I have logged in users when I update nbd
old image with no corruption
So there is no downtime for clients.
You can even delete the old image, linux will free it when the clients get rebooted
Yes, I know. I just wanted to be sure as I have 24/7 users.
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Hello, I am upgrading a debian LTSP server from jessie to stretch. Everything went fine until I regenerate the chroot and NDB image - the new image does not work : client screen remains blank
|11:48||* sebd looking through past days' irc logs|
using jessie's kernel fixes the issue
and using jessie's ndb clientimage works better too
sebd: did you run ltsp-build-client to create a new chroot?
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yes I did
alkisg: yes I did, and it went fine
now trying kernel 4.12.0-0.bpo.1-amd64
sebd: the client boots fine and it just has a blank screen?
with the default kernel
sebd: can you see the client screen with epoptes?
I've seen some issues with blank screen on ubuntu, on skylake clients...
Running just "xrandr" in lts.conf fixed the issue
same with latest bpo kernel
Xorg started by ldm, but display staying blank
(03:12:14 μμ) alkisg: sebd: can you see the client screen with epoptes?
|12:15||* sebd looks what is epoptes|
not using epoptes
epoptes: Epoptes is a computer lab administration and monitoring tool. It works on Ubuntu and Debian based labs with LTSP or non-LTSP servers, thin and fat clients, standalone workstations, NX clients etc. More info: http://www.epoptes.org
It's extremely handy for accessing ltsp clients
E.g. you'd click on "monitor client" and you might see that it displays a xorg screen, just not on the real monitor
I can login on 1st console (Ctrl+Alt+F1). text mode works. Trying xrandr now.
You can't run xrandr from vt1 just like that
You need the proper DISPLAY and XAUTHORITY
I know, I am adding XRANDR_COMMAND_0 in lts.conf server-side
well, now we see something, but screen is split in two and colors are all wrong
trying with another terminal
mmm I/O errors with ndb0
mm I'll start with regenerating the image
I/O errors might be normal, bug in nbd
sebd: is this a thin client or a fat client?
You might need X_SMART_COLOR_DEPTH=False
both fat and thin (same single image, kernel parameters select fat or thin)
And with fat you have split screen?
video mode not well initialized, screen is using only one quarter of the screen and is duplicated on both sides
What's the output of `xrandr` at that point?
It sounds like a thin client with 16 bpp
That's why I asked if it's fat
but I cannot get past ldm. Currently regenerating ltsp chroot
there are other issues
|12:46||* alkisg thinks sebd is multitasking too much to properly troubleshoot the issues in a step-by-step basis|
X_SMART_COLOR_DEPTH=False fixed the initial issue (screen mode)
the second issue is caused by sshd
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sshd issue fixed
thin clients work fine
but logging out from xfce4, ldm does not reappear (screen remains blank)
actually it works, but is very slow
(respawning ldm is very slow and cpu intensive) (on a w$ vista era laptop)
ok LTSP on debian 9 works
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now everything seems to work fine, even logging out and getting ldm back, and rebooting.
"/etc/rc.local : no such file or directory" at boot on thin clients
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install -pm755 /dev/null /etc/rc.local
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thank you gvy
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Hi, need some advice for ltsp setup in my school.
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I need to reuse old netbooks asus 1001 px as thin client
Everything works but it's extremely slow on videos
(youtube, I mean)
I discover today they're 64bit, they have 1M RAM
When used with XP, videos are ok
Do you think it's a good idea to make them fat clients?
ltsp-pnp: ltsp-pnp is the recommented method to install and maintain LTSP for "usual" setups. Since it doesn't involve chroots, it requires little to no command line to maintain it. It automatically supports both thin and fat ltsp clients. https://help.ubuntu.com/community/UbuntuLTSP/ltsp-pnp
ltsp-manager: LTSP Manager is a GUI tool that makes LTSP maintenance easy. It's the recommended way to install LTSP in common setups. More info: http://wiki.ltsp.org/wiki/Ltsp-manager
silvia_: yes, follow one of those guides
what's their cpubenchmark score?
How can I get it?
But no need for ltsp-pnp, because everything work now and, at the beginning, I thought they were 32-bit
well 64-bit chroot might help multimedia (for more registers and faster baseline command set)
ok, I'll rebuild chroot tomorrow
Is the benchmark for Atom N450 possibly 297?
Yes, it's a very old and lame processor
Similar to pentium 4, but with lower power consumption
yes, that's the main need for thin client
They should be able to barely play youtube full screen with no lost frames
How many clients?
And what's the server cpu benchmark?
And how much ram on the server?
And how many gigabit nics on the server?
8Gbyte RAM, 1 NIC
(those are not enough for 26 users already... without looking at the cpu)
No clue about CPU
(so I'd use fat clients even with just that info)
Is it a monster server,or some plain i3/i5 thing?
Don't know, is a big server outside, and that's all I know, right now
With that info, I'd use fat clients
And with 8gb ram on the server and 1 gb on the clients, I'd use 32bit ltsp-pnp
But it's a real server, not a pc used as a server
It saves ram
8 gb doesn't sound like a recent server
If you had 32gb and 10000+ cpubenchmark score and 2-3 bonded nics, I might advice thin clients then...
Ok, maybe I'm wrong, I'll check tomorrow but was bought last year
Your thin clients now have 297 score
297*26 = 7722
So your server must have higher score than that to perform better
ok, I've an idea I thank you veeeeery much
I now know what to check and consider
I really thank you
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Hi alkisg, regarding our chat yesterday. Have you seen the bug I raised and the suggested fix? Is that ok?
fzimper: eeeh sorry I didn't see it, link?
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Whoops just saw this one: https://github.com/NetworkBlockDevice/nbd/issues/51
systemd kills nbd roots?! :/
|18:58||* alkisg wonders if nohup would work...|
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message to Alkisg. Just reinstalled 32 bit Ubuntu Mate 16.04. Installed the PNP LTSP GUI with the new patch I saw you posted on the installation page. It worked perfectly out of the box!
Outstanding work. I cannot express my gratitude enough. This really is the easiest implementation of LTSP I have ever used.
My sincere thanks to you Alkisg....:)
and also any of other ltsp devs if they are online
Stephen: you're welcome! :)
|19:11||* vagrantc can't take much credit for ltsp-manager|
I can't believe a numpty like me can now install and get LTSP up and running in less than 15 minutes (including the building of the image). Incredible work. I am a teacher and this is now suffiiently easy to implement I can use it to showcase LTSP and Linux to schools I work in. Thank you again!
Stephen: you might want to start putting pins on the map:
hahaha will do
May your map be as crowded as ours :D
Sorry, been away. Here's the link: https://bugs.launchpad.net/ltsp-manager/+bug/1720209
fzimper: ooh, a patch!
fzimper: great work!
Heh, weird, didn't get a notification for this one
Not a very big one, but it survived a bunch of 9th-graders today :-D
fzimper: cool, thanks for the patch
|19:25||* alkisg put himself as the bug supervisor, I think that would be enough to get notifications...|
(supervisor for all ltsp-manager bugs)
There's some other issue I noticed with epoptes.. It often closes when a user signs off or shuts down her PC. Is that a known issue?
I'm not sure which epoptes process you mean there
epoptes-daemon running on the server, epoptes gui running by the teacher, root epoptes-client running on the client, session epoptes-client running on the client
Might be this one: https://github.com/Epoptes/epoptes/issues/21
Though it's not when I log them out
I've never seen the GUI close when clients do anything
Any error messages?
Will check the logs. Sorry, just wanted to know if that's a known issue.
There's a /var/log/epoptes.log file
No, it's not, never heard of it
So I'll try to get more detail and then add to the open bug or open a new one. Github is the right place for epoptes bugs, right?
Eh, I suppose so... I preferred launchpad but Fotis moved it to github...
and we haven't decided yet to move it back to launchpad... :D
So wherever you want :)
I'm more familiar with Github, but use whatever is more appropriate.
It's fine, use that
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Regarding that epoptes issue: I run epoptes from a fat client unsing ltsp-remoteapps - so it actually runs on the server. When a client logs off the epoptes GUI closes. Here's the epoptes.log: http://termbin.com/n2f03
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