IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 31 March 2014 (all times are UTC)
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| 11:10 | <santhosh> hai ,how to moniter ltsp thin clients
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| 11:12 | <santhosh> hai ,how to moniter ltsp thin clients in ubuntu
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| 11:30 | <elias_a_> santhosh: System monitoring or what?
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| 11:30 | santhosh: What are the things you want to monitor?
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| 11:47 | <andygraybeal> telex, nice nick. i usd to use telex app long time ago
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| 12:12 | <santhosh> hai ,what are the monitoring tools for ltsp thin clients
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| 13:55 | <Hyperbyte> mhm
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| 14:14 | <joe_sizlack> anyone no ltsp's relationship with openbsd-inetd?
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| 14:15 | I have it listed as a recommended dependency for ltsp-server
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| 14:15 | I'd like to use xinetd instead
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| 14:16 | <Hyperbyte> I believe it can be used to launch tftpd-hpa on-demand.
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| 15:05 | <Pedro_p> hi8
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| 15:05 | I have a problem with my ltsp, hope someone can help me
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| 15:05 | I configured lts to run localapps
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| 15:06 | when i connect with an user it works fine
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| 15:06 | but i created a new user and it doesn't run firefox as local app
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| 15:06 | don't know why...
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| 15:28 | <Pedro_p> Hi before i was talking about my extrange problem with some users running localapps and some other users don't
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| 15:28 | the users who can't run localapps have a login name only with numbers
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| 15:29 | i changed the users names mixing with letters and everything work
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| 20:26 | <Fanying> Hello, got a problem with LTSP desktop environment. We are using xfce4 as the desktop environment and users are having their window manager crash (titlebar disappear). Also at times when the user tries to move a window that the mouse would not let go of the hand grab (the windows stopped moving) and the user cannot click on anything else, an Alt-Tab key releases the mouse.
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| 20:26 | This server has 64 CPU cores and 512GB of ram with 1720 Disklessworkstations terminals.
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| 20:26 | 100 terminals
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| 20:27 | any sugguestions?
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| 20:27 | <vagrantc> distro?
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| 20:27 | <Fanying> Ubuntu 12.04 LTS
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| 20:28 | <vagrantc> was it working fine before?
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| 20:29 | <Fanying> no, users were having problems going all the way back. Unfortunately, the users never said anything really until 3 months ago and I have been working on it ever since.
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| 20:29 | * vagrantc is amazed at what people don't report sometimes | |
| 20:29 | <Fanying> I rebuild the entire environment (xfce4 desktop). The server itself has not been rebuilt
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| 20:30 | <vagrantc> they running as fat clients?
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| 20:30 | <Fanying> the server went in September of 2013
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| 20:30 | and the users actually had this problem from day one just, just they never reported it.
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| 20:30 | I did not realized how big it was until two months ago.
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| 20:31 | I did post a bug report on xfwm4, thinking that is where the problem might be but who knows if or when they will get to it.
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| 20:31 | * vagrantc nods | |
| 20:32 | <Fanying> I looked on the Ubuntu and XFCE4 forums on this kind of event and tried solutions like using xfwm4 --replace
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| 20:32 | did not work
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| 20:32 | no
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| 20:32 | thin clients, LTSP5
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| 20:32 | no local apps
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| 20:32 | this happens regardless of system load
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| 20:32 | <vagrantc> what's the server load like?
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| 20:32 | heh
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| 20:32 | anything in the user's ~/.xsession-errors ?
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| 20:33 | <Fanying> basically while the users are working on the application, whether it is Firefox or Terminal, the titlebar disappears, I have seen it live myself.
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| 20:33 | checked the .xsession-errors, and there were no output
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| 20:33 | nothing in the logs
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| 20:34 | and tried even with debugging symbols and using apport-bug
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| 20:34 | one thing I did notice using dmesg
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| 20:34 | <Fanying> xfce4-settings-[28554] trap int3 ip:7faca643ff9b sp:7fffa61b1ad0 error:
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| 20:34 | <vagrantc> i seem to recall something similar being reported at freegeek with an xubuntu variant...
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| 20:35 | <Fanying> I keep seeing this repeat, not constantly but appearing quite regularly
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| 20:35 | I also have seen this
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| 20:36 | [483198.198816] xfwm4[17469]: segfault at 0 ip 00007f1032ada566 sp 00007fff0c1a98b8 error 4 in libc-2.15.so[7f10329a8000+1b5000]
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| 20:36 | [1088792.715987] xfwm4[49442]: segfault at 0 ip 00007f4497efa566 sp 00007fff2bd3c418 error 4 in libc-2.15.so[7f4497dc8000+1b5000]
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| 20:36 | <vagrantc> included in your xfwm bug report?
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| 20:36 | <Fanying> yes
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| 20:37 | <vagrantc> hrm.
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| 20:37 | <Fanying> https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1299203
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| 20:37 | <vagrantc> my hunch is it's not LTSP specific
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| 20:37 | can you get it to happen on a disked machine?
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| 20:38 | <Fanying> that is the sickening part, never happens on desktop or laptop even with the same version and packages
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| 20:38 | these messages only appear on the LTSP server
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| 20:38 | I checked 62 desktop and laptop running Xubuntu 12.0.4.4 LTSP, nothing
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| 20:39 | all have updated packages
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| 20:39 | <vagrantc> how much memory do the clients have?
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| 20:40 | <Fanying> the thin clients have 2GB each, we upgraded them in June in preparation for the Ubuntu LTSP server. The older terminals could not support the newer kernels due to CPU or lack of memory.
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| 20:41 | <vagrantc> try running a few as fat clients?
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| 20:41 | see if you can reproduce the proble
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| 20:41 | m?
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| 20:41 | <Fanying> meaning running the xfce4 desktop environment on the local thin clients?
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| 20:42 | <vagrantc> LTSP_FATCLIENT=true in lts.conf ...
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| 20:42 | it'll require installing xfce in the ltsp chroot, but there might be something specific to the client hardware
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| 20:43 | <Fanying> ok, I can try it, I will have to test the environment to make sure it is exactly the same for the users, I want to minimize their impact.
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| 20:43 | <vagrantc> or xfce is just behaving badly the way we do thin clients
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| 20:43 | Fanying: do you use LDM_DIRECTX=true ?
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| 20:43 | <Fanying> LDM_DIRECTX=True
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| 20:43 | for performance reasons
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| 20:44 | <vagrantc> Fanying: you don't have to change all of the thinclients to fatclients ... i was suggesting trying it out on some of them just for debugging
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| 20:44 | <Fanying> that was set near the beginning of this server setup
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| 20:45 | I know what you mean, I was only planning on 5 terminals with users that have the greatest frequency, users that flip between applications very frequently.
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| 20:45 | all users have experience this as well
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| 20:46 | <vagrantc> another idea would be to try a newer version of ubuntu, or some other distro. obviously a bit invasive ...
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| 20:46 | but you could set up a test environment, see if you can reproduce it there.
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| 20:48 | <Fanying> Tried that but I ran into LTSP problems with the terminals not booting due to unable to the nbd-client unable to mount the root even though it is there and there have been reports of nbd-server problems with later versions of Ubuntu so hence I stay with 12.04
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| 20:49 | <vagrantc> try another desktop environment?
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| 20:49 | <Fanying> I have a test environment that I was able to reproduce the problem but I thought I fixed it by removing the old /etc/xdg files and rebuilding them fresh. That solved the problem with the users not crashing for 6 weeks but only I put them and the new configs back. It started happening again.
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| 20:51 | Tried to use another desktop environment but Gnome requires too much retrainning, KDE is a resource hog, LXDE just does not have the features need for the users to perform their jobs. I have tried them all.
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| 20:51 | I have tried every possible way to solve this problem.
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| 20:52 | Except for the fat client. I will try that next.
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| 20:52 | <vagrantc> hope it helps...
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| 20:52 | <Fanying> The only other option I have is to rebuild the server but it is extremely disruptive and I don't know if it would solve this problem. It would be a problem if it does not.
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| 20:53 | <vagrantc> Fanying: does disklessworkstations provide any support?
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| 20:53 | <Fanying> yes, and I will contact them for sure.
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| 20:54 | btw, do you know what this means?
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| 20:54 | xfce4-settings-[28552] trap int3 ip:7fa2eca49f9b sp:7fff84f71fa0 error:0
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| 20:54 | <vagrantc> not really
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| 20:54 | <Fanying> it is caused by xfsettingd which is run by xfwm4
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| 20:54 | xfwm4 --replace xfsettingsd
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| 20:54 | that is command it gets run as.
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| 20:56 | ok vagrantc, I really appreciate your response. btw, I can report that our system with 64 CPU cores can handle up to 70 users running very intensive Web 2.0 applications.
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| 20:56 | memory usage is not bad at all, just 128GB
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| 20:57 | and if you run LTSP as a KVM image, you must derate the system capacity by 27%
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| 20:57 | so with 64 CPU cores on direct hardware is 70 users, on KVM image, it is 51 users
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| 20:58 | and I confirmed that in the real world, just for you information.
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| 20:58 | the limitation of KVM running LTSP is context switching of the kernel.
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| 21:00 | <vagrantc> haven't heard reports of systems that large, yeah, that's really good to know.
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| 21:00 | <Fanying> I figure I shared that information since you have been very helpful to me.
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| 21:01 | <vagrantc> !stories
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| 21:01 | <ltsp`> I do not know about 'stories', but I do know about these similar topics: 'story'
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| 21:01 | <vagrantc> !story
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| 21:01 | <ltsp`> story: see: !worldmap
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| 21:01 | <vagrantc> !worldmap
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| 21:01 | <ltsp`> worldmap: If you're using LTSP, please let the world know and share your story at http://www.ltsp.org/stories/ Your can add a nice pin to our world map at your location, plus your setup will count towards the global LTSP usage statistics.
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| 21:01 | <vagrantc> Fanying: ^^
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| 21:01 | <Fanying> got it.
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| 21:01 | <vagrantc> dunno if you're exactly thrilled with LTSP at the moment, but information like that is really useful to the community
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| 21:05 | <Fanying> LTSP has been a great help to our client, it allows them to control IT cost to the point where they have literally swallowed up their competition, in fact they are most responsible to putting most of their competitors out of business.
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| 21:07 | <vagrantc> "LTSP has allowed us to CRUSH our enemies..."
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| 21:08 | <Fanying> yeah, that is not a joke. This is for real.
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| 21:08 | they have double in size and have become the biggest player in their market.
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| 21:08 | http://www.ltsp.org/stories/viewstory/?story_id=598&secret=aa2d13
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| 21:09 | I pin the story on ltsp
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| 21:11 | <vagrantc> thanks!
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| 21:12 | <Fanying> I will be calling Disklessworkstations but I will pop back in when I can report anything new. I will have to do testing with the fat client but I will give that a shot. Again, I appreciate your help.
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| 21:13 | I have to leave now, thanks.
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| 21:42 | <||cw> hm, wonder if the KVM de-rating is with all paravirt drivers or emulated drivers? I've found KVM to be rather impressive when guests are config'd right
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| 21:43 | <vagrantc> the virtio drivers are definitely much faster
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| 23:05 | <epoptes_user4> has anyone got epoptes working on a raspberry pi debian ltsp?
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| 23:07 | <vagrantc> shouldn't be any different than running on other hardware
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| 23:07 | although getting LTSP working with the rpi is a bit annoying
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| 23:07 | <epoptes_user4> failed to connect to proxy
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| 23:08 | I checked the keys - identical
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| 23:08 | checked the firewall - none installed
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| 23:08 | pinged and sshed into the server from the client
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| 23:10 | <vagrantc> can you log into the server through the GUI on the client?
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| 23:10 | <epoptes_user4> yes
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| 23:10 | ltsp working fine with rpi fat clients and a debian wheezy server
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| 23:25 | <epoptes_user4> just tested again - if i manually run /usr/sbin/epoptes-client it hangs and doesn't connect although some packets are exchanged according to my network monitor
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