IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 29 September 2017 (all times are UTC)
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| 05:24 | <alkisg> markit, no, I haven't heard that issue
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| 07:21 | <bcg> 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?
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| 07:22 | I mean, if I have logged in users when I update nbd
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| 07:22 | <alkisg> old image with no corruption
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| 07:22 | <bcg> Great.
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| 07:22 | So there is no downtime for clients.
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| 07:22 | <alkisg> Right
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| 07:23 | You can even delete the old image, linux will free it when the clients get rebooted
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| 07:24 | <bcg> Yes, I know. I just wanted to be sure as I have 24/7 users.
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| 11:46 | <sebd> 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
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| 11:48 | * sebd looking through past days' irc logs | |
| 11:56 | <sebd> using jessie's kernel fixes the issue
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| 12:00 | and using jessie's ndb clientimage works better too
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| 12:00 | of course
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| 12:02 | <alkisg> sebd: did you run ltsp-build-client to create a new chroot?
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| 12:07 | <sebd> yes I did
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| 12:08 | alkisg: yes I did, and it went fine
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| 12:08 | now trying kernel 4.12.0-0.bpo.1-amd64
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| 12:09 | <alkisg> sebd: the client boots fine and it just has a blank screen?
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| 12:11 | <sebd> yes
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| 12:11 | with the default kernel
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| 12:12 | <alkisg> sebd: can you see the client screen with epoptes?
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| 12:12 | I've seen some issues with blank screen on ubuntu, on skylake clients...
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| 12:12 | Running just "xrandr" in lts.conf fixed the issue
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| 12:14 | <sebd> same with latest bpo kernel
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| 12:14 | Xorg started by ldm, but display staying blank
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| 12:14 | <alkisg> (03:12:14 μμ) alkisg: sebd: can you see the client screen with epoptes?
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| 12:15 | * sebd looks what is epoptes | |
| 12:16 | <sebd> not using epoptes
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| 12:17 | <alkisg> !epoptes
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| 12:17 | <ltsp> 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
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| 12:17 | <alkisg> It's extremely handy for accessing ltsp clients
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| 12:17 | E.g. you'd click on "monitor client" and you might see that it displays a xorg screen, just not on the real monitor
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| 12:17 | <sebd> I can login on 1st console (Ctrl+Alt+F1). text mode works. Trying xrandr now.
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| 12:18 | <alkisg> You can't run xrandr from vt1 just like that
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| 12:18 | You need the proper DISPLAY and XAUTHORITY
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| 12:20 | <sebd> I know, I am adding XRANDR_COMMAND_0 in lts.conf server-side
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| 12:26 | not helping
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| 12:26 | well, now we see something, but screen is split in two and colors are all wrong
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| 12:26 | trying with another terminal
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| 12:30 | mmm I/O errors with ndb0
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| 12:30 | mm I'll start with regenerating the image
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| 12:33 | <alkisg> I/O errors might be normal, bug in nbd
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| 12:33 | sebd: is this a thin client or a fat client?
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| 12:33 | You might need X_SMART_COLOR_DEPTH=False
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| 12:34 | <sebd> ok
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| 12:34 | both fat and thin (same single image, kernel parameters select fat or thin)
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| 12:35 | <alkisg> And with fat you have split screen?
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| 12:35 | <sebd> video mode not well initialized, screen is using only one quarter of the screen and is duplicated on both sides
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| 12:36 | <alkisg> What's the output of `xrandr` at that point?
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| 12:36 | It sounds like a thin client with 16 bpp
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| 12:36 | <sebd> yes
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| 12:36 | possible
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| 12:36 | <alkisg> That's why I asked if it's fat
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| 12:37 | <sebd> but I cannot get past ldm. Currently regenerating ltsp chroot
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| 12:37 | there are other issues
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| 12:46 | * alkisg thinks sebd is multitasking too much to properly troubleshoot the issues in a step-by-step basis | |
| 12:51 | <sebd> I agree
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| 12:57 | X_SMART_COLOR_DEPTH=False fixed the initial issue (screen mode)
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| 12:57 | the second issue is caused by sshd
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| 13:06 | <sebd> sshd issue fixed
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| 13:12 | thin clients work fine
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| 13:12 | but logging out from xfce4, ldm does not reappear (screen remains blank)
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| 13:16 | actually it works, but is very slow
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| 13:16 | (respawning ldm is very slow and cpu intensive) (on a w$ vista era laptop)
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| 13:17 | ok LTSP on debian 9 works
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| 13:41 | <sebd> now everything seems to work fine, even logging out and getting ldm back, and rebooting.
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| 13:53 | "/etc/rc.local : no such file or directory" at boot on thin clients
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| 15:40 | <gvy> install -pm755 /dev/null /etc/rc.local
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| 16:11 | <sebd> thank you gvy
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| 16:15 | <gvy> yw
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| 16:39 | <silvia_> Hi, need some advice for ltsp setup in my school.
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| 16:39 | <silvia_> I need to reuse old netbooks asus 1001 px as thin client
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| 16:40 | Everything works but it's extremely slow on videos
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| 16:40 | (youtube, I mean)
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| 16:41 | I discover today they're 64bit, they have 1M RAM
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| 16:42 | When used with XP, videos are ok
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| 16:42 | Do you think it's a good idea to make them fat clients?
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| 16:43 | <alkisg> !ltsp-pnp
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| 16:43 | <ltsp> 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
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| 16:43 | <alkisg> !ltsp-manager
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| 16:43 | <ltsp> 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
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| 16:44 | <alkisg> silvia_: yes, follow one of those guides
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| 16:44 | what's their cpubenchmark score?
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| 16:45 | <silvia_> How can I get it?
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| 16:46 | But no need for ltsp-pnp, because everything work now and, at the beginning, I thought they were 32-bit
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| 16:49 | <gvy> well 64-bit chroot might help multimedia (for more registers and faster baseline command set)
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| 16:50 | <silvia_> ok, I'll rebuild chroot tomorrow
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| 16:53 | Is the benchmark for Atom N450 possibly 297?
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| 16:55 | <alkisg> Yes, it's a very old and lame processor
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| 16:55 | Similar to pentium 4, but with lower power consumption
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| 16:56 | <silvia_> yes, that's the main need for thin client
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| 16:56 | <alkisg> They should be able to barely play youtube full screen with no lost frames
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| 16:56 | How many clients?
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| 16:56 | <silvia_> 26
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| 16:56 | <alkisg> And what's the server cpu benchmark?
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| 16:56 | And how much ram on the server?
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| 16:57 | And how many gigabit nics on the server?
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| 16:57 | <silvia_> 8Gbyte RAM, 1 NIC
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| 16:57 | <alkisg> And cpu?
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| 16:58 | (those are not enough for 26 users already... without looking at the cpu)
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| 16:58 | <silvia_> No clue about CPU
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| 16:58 | <alkisg> (so I'd use fat clients even with just that info)
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| 16:58 | Is it a monster server,or some plain i3/i5 thing?
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| 16:59 | <silvia_> Don't know, is a big server outside, and that's all I know, right now
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| 17:00 | <alkisg> With that info, I'd use fat clients
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| 17:00 | And with 8gb ram on the server and 1 gb on the clients, I'd use 32bit ltsp-pnp
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| 17:00 | <silvia_> But it's a real server, not a pc used as a server
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| 17:00 | <alkisg> It saves ram
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| 17:00 | 8 gb doesn't sound like a recent server
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| 17:00 | If you had 32gb and 10000+ cpubenchmark score and 2-3 bonded nics, I might advice thin clients then...
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| 17:01 | <silvia_> Ok, maybe I'm wrong, I'll check tomorrow but was bought last year
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| 17:01 | <alkisg> Your thin clients now have 297 score
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| 17:01 | 297*26 = 7722
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| 17:01 | So your server must have higher score than that to perform better
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| 17:02 | <silvia_> ok, I've an idea I thank you veeeeery much
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| 17:02 | <alkisg> np
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| 17:02 | <silvia_> I now know what to check and consider
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| 17:02 | I really thank you
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| 18:43 | <fzimper> Hi alkisg, regarding our chat yesterday. Have you seen the bug I raised and the suggested fix? Is that ok?
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| 18:44 | <alkisg> fzimper: eeeh sorry I didn't see it, link?
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| 18:57 | <alkisg> Whoops just saw this one: https://github.com/NetworkBlockDevice/nbd/issues/51
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| 18:58 | systemd kills nbd roots?! :/
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| 18:58 | * alkisg wonders if nohup would work... | |
| 19:00 | Stephen has joined IRC (Stephen!5ad76ee5@gateway/web/freenode/ip.90.215.110.229) | |
| 19:01 | <Stephen> 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!
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| 19:02 | Outstanding work. I cannot express my gratitude enough. This really is the easiest implementation of LTSP I have ever used.
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| 19:02 | My sincere thanks to you Alkisg....:)
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| 19:04 | and also any of other ltsp devs if they are online
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| 19:10 | <alkisg> Stephen: you're welcome! :)
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| 19:11 | * vagrantc can't take much credit for ltsp-manager | |
| 19:13 | <Stephen> 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!
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| 19:14 | <alkisg> Stephen: you might want to start putting pins on the map:
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| 19:14 | http://www.ltsp.org/stories/widget-map/?location=Greece
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| 19:14 | <Stephen> hahaha will do
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| 19:14 | <alkisg> May your map be as crowded as ours :D
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| 19:20 | <fzimper> Sorry, been away. Here's the link: https://bugs.launchpad.net/ltsp-manager/+bug/1720209
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| 19:22 | <vagrantc> fzimper: ooh, a patch!
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| 19:22 | fzimper: great work!
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| 19:23 | <alkisg> Heh, weird, didn't get a notification for this one
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| 19:23 | <fzimper> Not a very big one, but it survived a bunch of 9th-graders today :-D
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| 19:23 | <alkisg> fzimper: cool, thanks for the patch
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| 19:24 | <fzimper> np
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| 19:25 | * alkisg put himself as the bug supervisor, I think that would be enough to get notifications... | |
| 19:25 | <alkisg> (supervisor for all ltsp-manager bugs)
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| 19:25 | <fzimper> 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?
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| 19:26 | <alkisg> I'm not sure which epoptes process you mean there
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| 19:27 | 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
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| 19:27 | <fzimper> epoptes gui
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| 19:27 | Might be this one: https://github.com/Epoptes/epoptes/issues/21
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| 19:27 | Though it's not when I log them out
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| 19:28 | <alkisg> I've never seen the GUI close when clients do anything
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| 19:28 | Any error messages?
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| 19:29 | <fzimper> No, nothing
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| 19:29 | Will check the logs. Sorry, just wanted to know if that's a known issue.
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| 19:29 | <alkisg> There's a /var/log/epoptes.log file
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| 19:29 | <fzimper> ok
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| 19:29 | <alkisg> No, it's not, never heard of it
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| 19:30 | <fzimper> 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?
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| 19:31 | <alkisg> Eh, I suppose so... I preferred launchpad but Fotis moved it to github...
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| 19:31 | and we haven't decided yet to move it back to launchpad... :D
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| 19:31 | So wherever you want :)
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| 19:32 | <fzimper> I'm more familiar with Github, but use whatever is more appropriate.
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| 19:32 | <alkisg> It's fine, use that
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| 20:11 | <fzimper> 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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