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


Channel log from 28 May 2015   (all times are UTC)

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03:05
<raimundo>
hello
03:07work_alkisg is now known as alkisg
03:07
<alkisg>
Hi
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08:18
<bojan_>
Alkisg:Can you please tell me what was the problem you faced when you were trying to change my LTSP thin to FAT Server??
08:19
alkisg:I want to make my server as FAT..Can you please help me??
08:19
<alkisg>
bojan_: I don't remember :)
08:19
bojan_: sorry, for a few weeks I won't have much time for free support, jobs come first... :-/
08:20
!ltsp-pnp
08:20
<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
08:20
<alkisg>
You can try this ^ though
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08:20
<alkisg>
You're welcome
08:20
:)
08:37
<fiesh>
does someone have an idea why, when entering a wrong login, it always takes forever, then the login manager closes and restarts, often extremely slow (like 20 seconds)
08:38
successful logins work fast
08:38
but wrong username and/or password results in a very slow login manager restart
08:39
<alkisg>
fiesh: which ltsp version? what's the output of `sudo ltsp-info`?
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08:39
<fiesh>
server 5.4.4, client 5.4.3, and:
08:39
server information:
08:39
LSB Version: n/a
08:39
Distributor ID: Gentoo
08:39
Description: NAME=Gentoo
08:40
Release: n/a
08:40
Codename: n/a
08:40
server packages:
08:40
ltsp-client-5.4.3
08:40
ltsp-server-5.4.4
08:40
ldminfod-20120430
08:40
ltspfs-1.1
08:40
packages in chroot: /opt/ltsp/amd64
08:40
ltsp-client-5.4.3
08:40
ldm-2.2.11
08:40
ltspfs-1.1
08:40
found: /opt/ltsp/amd64/etc/lts.conf
08:40
found: /tftpboot/ltsp/amd64/lts.conf
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08:40
<fiesh>
(it's always been like this, but now it sometimes really does become a nuisance)
08:41
but it's ok if there's no "oh yeah, do this and that, common problem" solution, it's not really worth going through a lot of debugging either, just forces people to type their password correctly ;)
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08:49
<alkisg>
Gentoo? Nice... :)
08:49
I was thinking it could be related to a recent change in ltsp, but you're using an older version
08:50
So it's just plain ssh time outs etc, as ldm is using ssh
08:50
You can search+change those from /etc/ssh/ssh_config and/or LDM_SSH_OPTIONS
08:56
<fiesh>
oh, so the server has a long timeout on an incorrect ssh login, resulting in this long timeout? hmm, even though running sshguard, I'm a little hesitant to raise these values too far, since the server is publicly accessible via ssh
08:58
I don't think there's a way to handle this from the client side, since it's the server who is (on purpose) delaying the wrong login information message, correct?
08:59
but thank you for explaining, makes total sense, should have thought about it myself
09:01
<alkisg>
The ssh client side does have its own timeouts, but they're not as big as you describe
09:02
It might be possible that sshguard makes things worse...
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09:08
<fiesh>
sshguard is whitelisted on the internal network
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09:32
<alkisg>
Not as a firewall, as a delay
09:32
(I don't know sshguard though)
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11:38
<gp>
vagrantc: About using centrifydc auth on the clients - that would probably simplify things. I am not sure if the joining the windows domain could be automated very well though. I will have to look into it
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11:45
<gp>
Is it possible to use variables in the lts.conf? I was thinking about a more concise way to configure some clients to default to LDM and some to default to xfreerdp. It would be nice if I could define the xfreerdp command as a variable and do something like SCREEN_07=$PRIMARYXFREERDPCMD or SCREEN_06=$PRIMARYXFREERDPCMD to prevent typos
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12:27
<awei_>
hi, I'm getting permission denied errors when the client boots and tries to write to /etc/hosts. any ideas?
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14:20work_alkisg is now known as alkisg
14:25
<miup>
alkisg: ok... but with our squeeze images, some clients work "smoother" as with wheezy :/ Anyhow, Scrolling in Firefox i.e is mostly really smooth. But scrolling in a terminal is really annoying if you scroll trough text. You can see how the lines slide ;)
14:26
<alkisg>
miup: is that xterm or gnome-terminal?
14:26
<miup>
urxvt
14:26
<alkisg>
Does it use double-buffering?
14:27
<miup>
huh, dunno... wait a minute (with xterm there are the same symptoms)
14:28
<alkisg>
About squeeze vs wheezy, at that point the XAA acceleration method was dropped, that's why some drivers started being very slow or unstable or completely non-functional
14:28
It's a xorg issue
14:28
xterm doesn't use double-buffering AFAIK, while firefox and gnome-terminal do
14:29
Anyway, whatever xorg issues are there in ltsp-localapps, surely LTSP isn't to blame, xorg is
14:30
<miup>
it's clear that it is an xorg issue, but maybe anyone around here has similar experiance ;)
14:31
<alkisg>
Sure, we all had that experience :)
14:31
<miup>
oh, and disabling/enabling buffering in urvxt makes no difference
14:31
<alkisg>
What buffering are you referring to?
14:31
Scroll buffer?
14:31
That's a completely different topic
14:31
It's not related to drawing to the screen at all
14:31
<miup>
buffered: boolean
14:31
Compile xft: Turn on/off double-buffering for xft (default enabled). On some card/driver combination enabling it slightly decreases performance, on most it greatly helps it. The slowdown is small, so it should normally be enabled.
14:31
;)
14:33
<alkisg>
It's unrelated
14:33
It's about font buffering, not about screen buffering
14:33
Try with gnome-terminal
14:34
<miup>
mee, I'm trying the installed terminals...
14:35
hm... with xfce4-terminal it is better, one sec, I will test a thing
14:37
(we don't have gnome-terminal installed, we using lxde or i3, so mostly no gnome related packages ;))
14:38
<alkisg>
Sure I was just trying to say that if you install live on the client you'll get a proof that it's app-related, not driver-related
14:38
<fiesh>
hmm, xterm works really well for me
14:38
is it supposed not to? ;)
14:39
<alkisg>
The xterm flickering is too fast to be annoying in quick PCs... :)
14:39
<fiesh>
oh ok, hehe
14:40
dosbox also works like a charm, and so does mplayer, I was surprised
14:40
<miup>
it's a shame urxvt is not working charm :/
14:40
<fiesh>
only certain qt applications suck, most notably qtcreator....
14:41
<miup>
fiesh: we are mostly working with PIII @ 1GHz with a "better" GPU
14:42
<fiesh>
yeah I guess that's a whole different story then, we have the newest NUCs and 4k monitors... which surprisingly also work great with thin clients
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14:44
<fiesh>
miup: is that even superior so say just using a raspberry pi?
14:44
<awei_>
hi, i broke my ltsp image somehow. i'm now getting "Permission denied" from client when trying to write to /etc/hosts on startup. any ideas?
14:44
<fiesh>
to
14:45
<alkisg>
miup: btw what's the output of `lspci -nn -k | grep -A 2 VGA` on these clients?
14:46
awei_: distro/version?
14:46
<awei_>
alkisg: thx for reply. running ubuntu 14.04 with ltsp-client 5.5.4
14:47
<alkisg>
awei_: are you using the greek schools ppa?
14:47
<awei_>
alkisg: here's backstory: i thought i was being clever by mounting the NFS image read/write so that i could do some desktop-based configuration/installation then change back to read-only when finished. now it won't boot.
14:47
alkisg: i'm using greek schools ppa, yes.
14:47
<alkisg>
awei_: nfs? ubuntu uses nbd by default...
14:48
<awei_>
alkisg: i configured to use NFS mounted image and /home
14:48
<alkisg>
OK about /home, but why NFS mounted image?
14:48
<awei_>
well, again, i thought i was being clever so that i could install from the GUI rather than command line
14:48
and then i would switch back to read-only after i was satisfied
14:49
but, now that i've switched back, i'm getting write permission issues. I could rebuild from scratch and do all install from command line in chroot, but was hoping someone might see something obvious
14:50
<alkisg>
The ltsp boot process destroyed your chroot since you had it rw and overlayfs doesn't work upon nfs
14:50
<awei_>
ok, so, bottom line is don't do what i did.
14:50
<miup>
fiesh: I was using my private raspberry as LTSP client with berryboot, it was ok but I like to use a dualhead setup
14:51
<alkisg>
awei_: Right. You could check the date of all the files and try to revert them, or you could build a new chroot.
14:51
<miup>
alkisg: 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV350 [Radeon 9550] [1002:4153]
14:51
Subsystem: ASUSTeK Computer Inc. Device [1043:008e]
14:51
Kernel driver in use: radeon
14:51
<alkisg>
awei_: for gui management of chroots, see ltsp-pnp
14:51
!ltsp-pnp
14:51
<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
14:51
<awei_>
ltsp`: i tried that tutorial with little success, unfortunately.
14:52
ok, no worries. thanks for the explanation. i'll rebuild using command line and read-only.
14:53
<miup>
alkisg: but mostly all clients are differnt, we using old hardware, because we collect them (und better hardware ~core 2 duo) and repair and sell them
14:53
<alkisg>
miup, for old hardware check this: http://www.phoronix.com/scan.php?page=news_item&px=MTA0NDg
14:54
We have a lot of old cards here too (supporting hundreds of schools), we usually just throw away XAA-based cards
14:54
<miup>
hm... I will take a look
14:55
<alkisg>
The biggest problem is SiS (onboard), they're too common, and barely work with EXA, but give a lot of segfaults
14:55
Anyway, some xorg-related channel would be more suited for your questions...
14:55
They have more xorg knowledge than #ltsp
14:56
<miup>
I will take a look
14:56
but thanks for your time and help (:
14:56
<alkisg>
np
14:58
<miup>
anyhow, I'm currently testing setups, to determine which are the hw requirements to work properly and smooth
14:59
<alkisg>
It really depends on the kernel + xorg version
14:59
<miup>
and as I can see, mostly the cpu's are the bottleneck
15:00
<alkisg>
It's very hit-and-miss, we've kept schools at 12.04 because they have many kernel/xorg versions there, and it's easier to find a combination that works
15:00
But we even had schools that needed 2 chroots because no single combination worked in all clients :(
15:01
<miup>
hm... but proberly with newer software packages?
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15:01
<alkisg>
No, we've seen all combinations of old/new working/not-working
15:01
There are many regressions even for new hardware
15:02
<miup>
mee, on my old private gaming rig, I had also a xorg problem and was long using squeeze because of this
15:02
<alkisg>
So e.g. we've had schools with dual core PCs that needed the older kernel, yet their 15-years-old P3's were working fine with all kernels...
15:02
<miup>
xD
15:02
thats interesting
15:03
<alkisg>
A complete mess, our advice now is "keep whatever's working"
15:03
<miup>
:D
15:04
as I said, we have also two chroots because of some weird incompatiblity
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15:10
<s0lid>
Hey any idea why xorg is throwing me fatal error, "invalid argument for -config"?
15:11
this usually happens when I got machine with intel's integrated gpu or the machine is a laptop, although one laptop with intels gpu work
15:13
something must happen with generating the xorg.config
15:16
https://bugs.launchpad.net/ltsp/+bug/816139 oh :)
15:21
<gp>
Anyone familiar with setting up a web browser screen like a kiosk for anonymous use? I'd like to have a terminal set up for anyone to access web mail
15:21
Maybe like the xfreerdp screen script but with a browser
15:23
I guess it would be important to automatically wipe saved passwords and history after inactivity
15:28
<alkisg>
gp, there's a kiosk plugin for ltsp, see the bug above ^
15:28
google for kiosk ltsp
15:28
SCREEN_07=kiosk etc
15:29
<gp>
alkisg: Okay cool. Thanks. I had looked for it but all the information I found indicated it was outdated. I didn't want to try it without asking.
15:30
<alkisg>
It's not very well maintained, but it was rewritten a couple of years ago... it should mostly work, with a couple of bugs...
15:30
<gp>
Well that should get me going
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20:38
<gp_alt_>
So I've removed shutdown options available on the desktop. Malicious users could override my efforts but I am okay with that for now. But, I am having a difficult time finding a way to remove the shutdown option from the LDM greeter. Anyone know how to do that?
20:39
I would prefer to actually remove the button. Not just make it non-functional via user permissions of some sort
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21:06
<awei_>
hi, using ltsp-server 5.5.4 and ltsp-client 5.5.4 on ubuntu 14.04. clean ltsp client image with gnome installed as DE. I'm getting "cannot create /etc/hosts permission denied" and DE does not load
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