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


Channel log from 5 September 2014   (all times are UTC)

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11:44
<JuJuBee>
Hyperbyte: Morning... What do you mean fresh install? On the server and then start from scratch?
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12:07
<skyprox>
d
12:08
q all
12:08
I am install ltsp-server to centos-7 from repository epel-6
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12:08
<skyprox>
I have problem on start PXE terminal client
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12:15
<skyprox>
system[1]: Job dev-nfs.device/start timed out.
12:16
system[1]: Timed out waiting for device dev-nfs.device.
12:16
system[1]: Dependency failed for /sysroot
12:16
and more
12:21
google not find information of install ltsp-server on epel-t :-(
12:23
epel-7
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14:23
<ageis>
Thin clients are experiencing a great deal of lag (moving the mouse, drawing stuff on the display, doing anything).. It only seems to happen when certain users log in, sometimes everything is fine and totally snappy/responsive, but investigation of processes/memory usage/load shows absolutely NO indication of what it could be. does anyone have any ideas
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14:24
<||cw>
network saturation?
14:25
do you have direct_x on?
14:25
I use iftop to eval real time network using
14:26
<ageis>
LDM_DIRECTX is True and xserver is nvidia proprietary
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14:27
<ageis>
||cw: so I have one IP showing 90mb in iftop and the next one is just 1mb. does that look like a prob to you?
14:28
<||cw>
mb or MB? gigbit lan?
14:28
90MB on gigE is pretty much swamped. do they have a high resolution screen? watching full screen youtube or something?
14:29
also if all your clients are gigE, you probably want 2 or more nics bonded on the server
14:30
<ageis>
||cw: dunno.. now I'm looking at vmstat and the 'wa' column is regularly 98 (per http://www.tummy.com/articles/isolating-heavy-load/) which the author seems to indicate that something is raping the disk
14:30
<SpComb>
iotop
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14:31
<||cw>
or iostat -x -m 1
14:31
should quantify that
14:31
<SpComb>
are you swapping, perhaps?
14:31
<ageis>
no im ont
14:31
*not
14:31
don't see anything unusual here
14:32
avg-cpu: %user %nice %system %iowait %steal %idle
14:32
0.00 0.38 0.25 0.00 0.00 99.37
14:32
total disk write in kilobytes
14:33
<||cw>
ageis: iostat does't tend to give accurate readings on the first one, let it run a bit
14:33
<ageis>
ah k
14:33
if I have a hunch then it would be 3d acceleration and chrome or something
14:34
<||cw>
it'll just tell you which disk, and if it's heavy IOPS and latency or whatever. iotop will then tell you what process it is
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14:35
<ageis>
it would appear that one user is swamping the network bandwidth though
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14:38
<gdi2k>
hi, I have a question about network config on LTSP. We are heavy softphone users and I am toying with creating a voice VLAN for them. On Xubuntu 14.04 can I just use /etc/network/interfaces as usual, or is something special required in LTSP? I am not seeing the default interface in that file, which makes me thing it may be somehow handled by LTSP in a different way
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14:39
<gdi2k>
this is for fat clients
14:40
<||cw>
gdi2k: sounds like it's using network manager. there is a way to preconfig that, or you can switch to using the interfaces file, and network manager will honor that
14:40
<gdi2k>
||cw, ok magic, will give it a whirl, but maybe not today ;) thank you
14:40
<||cw>
won't let users edit it though, it'll just show status
14:41
<gdi2k>
yes, that's fine - they don't need to touch network config
14:41
<ageis>
||cw: can I isolate network traffic by process?
14:41
<||cw>
it's all just files, pretty well documented as I recall, but it's been a while
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14:42
<||cw>
ageis: you can turn on showing by ports in iftop, then maybe cross reference that with netstat -p
14:42
<ageis>
what's the switch for that
14:42
nvm
14:43
<||cw>
works similar "top"
14:43
<ageis>
thanks
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14:44
<ageis>
||cw: there is no pid attached to the heavy port, it looks like its just the x11? tcp 0 0 ltspserver:44377 192.168.1.145:x11-7 TIME_WAIT -
14:47
<||cw>
x11-7 would be the :7 connection? maybe check "who" to see who's got that one?
14:47
<ageis>
hmm it might be chrome
14:47
<||cw>
I don't have a system I can check on right now
14:47
<ageis>
||cw: yeah I already know who it is
14:48
<||cw>
ah, right, the display itself is what's using the bandwidth, so the only way to look at what's changing on screen
14:48
<ageis>
but they say they are doing standard browsing, no YouTube, downloads or anything unusual. wonder what would cause chrome to saturate network
14:49
<||cw>
there's no metric for what x11 window ID is causing screen updates
14:49
3d rendering?
14:50
<ageis>
||cw: maybe I should enable various GPU accelerations in about:flags.. the clients all have nvidia chips, but the ltsp server itself doesn't
14:51
<||cw>
ageis: and you're using thin clients, not fat? any reason for that?
14:52
<ageis>
just how it is :P
14:52
<||cw>
might be worth looking at changing that
14:53
doens't really matter what video card is in the clients or server, only fat clients will properly accelerate
14:53
<ageis>
they are pretty well invested in the thin clients, there's like 20 of them, relatively new, and we just upgraded the server
14:53
<||cw>
what are the client specs?
14:54
<ageis>
intel atom d2550 1.86ghz, 2gb DDR3
14:54
<||cw>
2gb+ ram? dual+ core?
14:54
that's worth trying, build a fat image and turn it on for one of them
14:55
<ageis>
I thought fat meant having a disk; you mean it stays in RAM?
14:56
<||cw>
no, it uses nbd for the OS and ssh for /home, by default anyway
14:56
just like thin, except all apps run local
15:00
<ageis>
why is it that only fat clients will properly accelerate
15:03
<||cw>
because the server runs the programs and doens't have direct access. pretty much unless it's xv based, you get software rendering, and possibly an uncompressed bitmapped transfer
15:03
<ageis>
ahh
15:03
do the clients and LTSP need to have the same GPU
15:03
<||cw>
no, the server doesn't use a gpu at all
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15:11
<ageis>
||cw: What does the LDM_DIRECTX directive do? (I note that DirectX is for windows, lol)
15:20
<||cw>
it turns off encryption and with it compression. increases bandwidth, but reduces latency by a lot.
15:21
you can try turning it off, gigE and the atom cpus might be low enough latency that it won't matter
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15:23
<ageis>
||cw: i.e. True turns off encryption and compression, increases bandwidth, reduces latency?
15:24
||cw: is there any standard way that people do traffic shaping, throttling of clients with LTSP?
15:30
<||cw>
yes, and not that I'm aware of
15:30
you will need more than one nic in the server
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15:31
<||cw>
if you have 100Mbit client, you can get away with a single 1Gbps nic, but if your clients are 1Gbps, you're going to need more bandwidth for the server.
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15:42
<ageis>
||cw: here's iostat btw http://pastebin.com/EzPYU7V3
15:42
roger
15:43
I think they are 100mbit but I need to check
15:43
<||cw>
as long as the server is on a gigE port on the switch, that works well
15:43
<championofcyrodi>
found this, this morning. (console based xmpp) http://www.profanity.im/
15:44
<||cw>
it'll take 10 clients at full load to max the server
15:44
<championofcyrodi>
not ltsp related, but thought one or more might enjoy it
15:45
<||cw>
championofcyrodi: is that new? there was one back when jabber was first invented
15:47
<ageis>
xmpp-client
15:56
<championofcyrodi>
i guess, not really sure how new it is
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16:22
<ageis>
||cw: So how does one send a different lts.conf per-client ?
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16:23
<||cw>
not sure you need to. just over-ride the settings you need in a mac address section
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17:30
<gothaggis>
so on my old ltsp 10.04 server, pulseaudio is installed. on my new testing server 14.04, it is not. local sound appears to work on thin clients. is there any reason to install pulseaudio?
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19:15
<here_and_there>
hello
19:16
I have a trouble with localapps and libreoffice
19:16
could someone please help
19:16
when launching as a localapp libreoffice don't start at all.
19:17
one can just see the progress bar for about one second and then it disapears
19:17
when run as a remote app it works fine
19:17
when I launch ltsp-localapps xterm and then start libreoffice from there I see no debug message
19:18
I have hard time debug that so if someone could help it would be great
19:19
I can start simple java programs with ltsp-localapps java program.jar etc...
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19:20
<here_and_there>
but there is one more java webapp which I can't start as a localapp
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19:37
<here_and_there>
back
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21:23
<Nemno76>
hmmm failed to load session "ubuntu" ?
21:24
server information:
21:24
No LSB modules are available.
21:24
Distributor ID: Ubuntu
21:24
Description: Ubuntu 12.04.5 LTS
21:24
Release: 12.04
21:24
Codename: precise
21:24
server packages:
21:24
ii ldm-server 2:2.2.9-1ubuntu0.1
21:24
ii ltsp-server 5.3.7-0ubuntu2.8
21:24
un ltsp-utils <none>
21:24
ii ltspfs 1.1-2
21:24
packages in chroot: /opt/ltsp/i386
21:24
ii ldm 2:2.2.9-1ubuntu0.1
21:24
un ldm-themes <none>
21:24
ii ldm-ubuntu-theme 2:2.0.47
21:24
un ldm-ubuntu-themes <none>
21:24
ii ltsp-client 5.3.7-0ubuntu2.8
21:24
ii ltsp-client-core 5.3.7-0ubuntu2.8
21:24
ii ltspfsd 1.1-2
21:24
ii ltspfsd-core 1.1-2
21:24
found: /opt/ltsp/i386/etc/lts.conf
21:24
found: /var/lib/tftpboot/ltsp/i386/lts.conf
21:24
found image: /opt/ltsp/images/i386.img
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21:28
<Nemno76>
oopss.. i think i know the "problem" i used the ubuntu server version to do a build-client en there is no desktop...
21:48
pfeewww, after ltsp-chroot, apt-get install ubuntu-desktop, ltsp-update-image (was this needed?) and the add ipappend 3 in the pxelinux.cfg/default it works
21:48
:p
21:55freedomrun has joined IRC (freedomrun!~quassel@unaffiliated/freedomrun)
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23:50
<gdi2k>
Nemno76, :)
23:51
<Nemno76>
hey gdi2k, now got the server on a pc running ubuntu in openvz
23:51
<gdi2k>
Nemno76, maybe it was just virtualbox being difficult!
23:51
I use KVM with no issues
23:53
<Nemno76>
but it should work... i mean the network stuff connects.. the image starts booting... so.
23:55
there are 2 ways to get the ip from the host to the client one is the apappend3 and the other is the nbdroot=hostip:ltsp_386 both are a solution.
23:57
apappend3 = ip append3