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alkisg: "xauthority" :: to access the client X session from a local root shell, try: eval $(tr '\0' '\n' < /proc/$(pidof -s ldm gdm-simple-greeter gnome-session | cut -d' ' -f1)/environ | egrep '^DISPLAY=|^XAUTHORITY=') && export DISPLAY XAUTHORITY
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Hi, LTSP was running good so far, but today few machines started hanging... when I checked the top -c on fat-clients the load is due to nbd-client and sshd
will nfs solve this issue ?
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Trixboxer: hanging <> load
Was that a complete hang?
sometimes display gets scrambled
and sometimes nothings works
That doesn't sound like a load problem
It sounds more like a networking problem or a driver problem
I meant fat-client load
Scrambled display, hanging etc wouldn't be caused just by heavy load
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alkisg: scrambled display might be Display driver problem, but the fat-client is facing a load and getting slow
firefox, ssh, nbdclient are running constantly
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Anyone made script for upstart in 10.04 ?
muppis: Whats that ?
muppis: do you mean a script to run at startup?
startup of what: server, ltsp login, client?
Instability problem with cups and I'd like move it from /etc/init.d -script to /etc/init to gain respawn ability.
on the server?
when do you want the script to be executed? On boot?
or on login from client?
On boot of server, like /etc/init.d/ -scripts.
ok, the easiest thing is to look at how those scripts are written and then write a new one as appropriate
got to run, back later!
Well, its already done for Natty (11.04), but that script doesn't work for 10.04. So it is possible to do after all or do had upgrade upstart also?
Trixboxer: if you close firefox are you still getting a load?
muppis: can you pastebin the 2 scripts? (lucid/natty)?
alkisg: firefox load gets reduced but other processes remains same
chrome was an option to try but it is not running.. It will need nbd
To try what?
alkisg: to try it as a replacement of firefox
Chrome won't work with sshfs without workarounds
It does run with nfs
nbd is for the root file system, it's irrelevant to the apps
So it's (NBD) AND (SSHFS OR NFS)
(for Ubuntu, at least, and without modifying any scripts)
hmm then why my ssh processes is jumping up.. will find out
how much memory a client needs for plain and boring 2d work?
mnemoc: the bare minimum is 64M
With 128MB it's much easier
cool, thanks :)
I was wondering if 128M was really enough :)
mnemoc: you'll only get crashes with 128MB if much X memory is used for pixmaps caching, e.g. in a few rare web sites while using firefox (chrome doesn't have that problem)
E.g. if you try to visit a page where the admin has a 4000x4000px background, firefox will crash
does an small DOM for swapping make sense, or it's just a waste?
There's a command line option in firefox that disables pixmap caching, but it makes it a little slower so I'm not even using that with 64/128mb clients
You could also enable nbd swapping if you want, it helps sometimes
this world sounds fun :)
alkisg: Did you have the time to try the Google Maps thing?
elias_a: a teacher here started it yesterday, http://goo.gl/maps/nOoQ
Thanks for the idea!
It seems to be a good idea as I showed mine 2 hours ago and it got tweeted right away ;-)
elias_a: btw, there's an option to get a small url like the above for your map
alkisg: Cool - how do you do that?
I just used bit.ly type services...
I got a "new" menu on top of google apps, and there was a google app for short URLs there
*on top of google maps
So I just activated it and it gave me the URL...
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alkisg: Did the teacher think that the idea was fun?
elias_a: sure, he was first thinking to make a spreadsheet with the schools, but as soon as he heard the google maps idea, he immediately started it...
Now let's hope schools will actually put themselves in the map :)
I try to promote this idea through a couple of channels: FSFE Edu-team and KDE Edu team.
elias_a: what's your short url?
Try also the edubuntu mailing list
Let's make this thing again in english after getting it running nationally....
alkisg: Should the short URL come to the same place as the old long one?
I think it automatically detects the pins and magnifies accordingly, but I'm not sure, I haven't tested much
Are you putting only LTSP installations in there? Or other non-LTSP Linux installations too?
alkisg: No I mean that where should the short format URL be presented?
Actually there are some schools who are running FLOSS sw on Windows, too...
Or at least was...
We're only putting there labs that use LTSP + our sch-scripts
About the short URL, I'm using it when I want to give people a link to the map. But I don't see it in the google maps UI after the initial time I activated the short URL app...
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can the clients use an ssh key for "pre authentication"?
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I had to restart Firefox in order to get the short URL to work.
any hint about how to accept login/password when from certain computers, and key-only from the rest? :( (ltsp ubuntu 10.10)
or to let the clients use a key to a single account and su - to the real to test the password?
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mnemoc: key-only? you mean ssh?
mnemoc: ldm doesn't use ssh keys
It can use autologin information, if you like...
i need LDM to do password auth, but I can't allow everyone to ssh from "outside"...
mnemoc: Should'nt your firewall be taking care of that?
mnemoc: then just modify sshd_config accordingly
alkisg: i didn't know sshd_config accepted conditionals..
It has a pretty wide range of configuration options. E.g. listen to that card, allow key-only authentication from outside, etc etc
nice, thanks, i'll read it's documentation deeperly
alkisg, those scripts are out-of-box scripts from cups -package. Problem is why upstart in Lucid doesn't see that what is used in Natty. Am I missing some configuration or what?
Match Introduces a conditional block. \o/
yes yes yes /me does the dance of success
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hi, it is expected that the root's .ssh/authorized_keys be deleted on thin clients ? (using ltsp-cluster)
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wow there is a ltspcluster.org :)
AndyGraybeal, are you talking about me ?
well, you spurred my curiosity to look it up, but i don't know your answer.
i'm still getting a handle on things without the cluster :)(
i would like to run a high-availablilty cluster though, just in case one of the machines has a problem, i have a backup machine ready to go.
i dont' know how to connect the dots though.
clusters are lovely that way. Follow the cluster wiki up on UbuntuLTSP wiki, it walks you right through
load balancing, the whole she-bang
i thought that the UbuntuLTSP wiki was unfinished.
Not that I've noticed, but I could be mistaken
maybe it's been updated since i last read it :)
is there a configuration for high-availability or just load balancing?
What i've found is mostly load balancing. However, couldnt you help with high-availability with more cluster points?
I see what your asking for, and am sure theres someway in the DHCP setup to make it work, but it goes beyond my understanding at this time.
i was hoping to run just two machines, and if one fails, the other takes over or something like that.
that sort of defeats the purpose of a cluster, does it not?
i don't have a large setup, but i don't want to go through the pain of dealing with an outage.
since the benefit is allowing to share the load out to many, not as powerful machines, instead of going with a beast/
i don't tihnk it defeats the purpose at all, it's just a different type of cluster.
i have 5 clients, max.
maybe 10 in two years. i don't need much of a beast.
i'd recommend looking into setting it up on a virtual disk then. Quick and easy switch over if you do have a failure. For that low amount of clients, it appears overkill to do much more
and a virtual disk would be...?
Set up your entire LTSP as a virtual machine
using KVM or VMware or some such.
ah virtual machine
what if the machine dies that's running the virtual machine?
but that means downtime.
If you have virtual disk backed up, we're talking 20 min downtime, max.
if you have the new hardware ready to go, of course.
yea, exactly, so i would lik to make it 'hot' if i could.
with a HA cluster.
I'm not sure how to do that then. I'm sure it can be done, but out of my range.
Problem I see with what your asking is the way the clusters work, they still have a core, 'root' server which responds to the pxe requests and such. That's the one you'd worry about going down in a HA, and the only way I could think of keeping that going would be a second machine, virtual or otherwise, that is kept at a constant state of readiness via rsync or something like, that you can switch to at a moments notice.
hey I seem to have a problem with /usr/share/ldm/rc.d/P00-ltsp-cluster
manually trying to connect to port 8001 of my ldm server doens't work
is this port open temporarily ?
web based cluster admin program, nice.
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hi, where can I see (log) why ldm-script init just exists? http://dpaste.com/272879/ (ubuntu 10.10)
mnemoc: do you have a WM on the server? Check that user's ~/.xsession-errors and also check if it's a problem with compiz
alkisg: "gnome-wm" :: the default window manager in gnome is gnome-wm, which automatically chooses compiz if it thinks that the card supports it. Compiz is causing login problems to some clients. To disable it, see !disable_compiz. To restore it, see !restore_compiz
mnemoc: "disable_compiz" :: To disable compiz, try: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /desktop/gnome/session/required_components/windowmanager metacity
alkisg: thank you :)
Someone should really file a bug for that... :)
I've seen more than 100 people here having that problem, yet no bug reports yet
alkisg: who should I blame?
(in compiz or in gnome-wm, not in ltsp)
mnemoc: "restore_compiz" :: if you disabled compiz by running the command suggested by the !compiz factoid, and you want to revert the change, run: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --recursive-unset /desktop/gnome/session/required_components
Either gnome-wm for the wrong autodetection of compiz-enabled cards, or compiz itself for crashing
can they blame ltsp back?
If it's our problem to fix, I hope they'll do so :)
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doubt... from where to `apport`? :p
Try filing it without apport first, and if they ask you to, I guess they'll also provide instructions...
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hm where do i find the defaults for lts.conf
i want to start customizing it
Gadi: "lts.conf" :: http://manpages.ubuntu.com/lts.conf
yay! that worked!
hmm... that manpage needs some updating
but, a good start
LDM_SERVERS is missing from there hm
is that still a valid parameter?
trying to allow the selection of various ltsp servers
There's no such parameter... I think LDM_SERVER can have multiple values though
i don't see that here either hm
can always just se it and see what happens i suppose
I mean that there's no such parameter in the whole LTSP code
shows both options
Gadi: in manpage is duplicated item for FRONT_VOLUME
komunista: actually, all those _VOLUME params should be replaced with an explanation
komunista: since you can use: <channel_name>_VOLUME
Gadi: OK, I only report duplicates which I found, to have this nice work better ;-)
Maybe we should start commenting all the lts.conf parameters in the code with some special syntax, and have a script that extracts the descriptions and puts them to the man page...
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what about virtualbox in ltsp, is there any ltsp related issues?
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alkisg: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/673072 <--- anything else you would attach?
mnemoc: looks fine to me - for other bug reports I think devs prefer the messages to be in English, i.e. set LANG before reproducing the bug
mnemoc: I don't have a client where I can reproduce that bug, but I wonder, does it also happen without LTSP?
Does your client have enough RAM to boot it from a live ubuntu usb stick?
i didn't see anything "interesting" in spanish... set lang in LDM and attach a new xsession-errors?
Nah, I don't know any spanish and I didn't have any problems reading through that
the client is 13000km from here... it has ~230MB of ram... should I try to get them booting 10.10 from a stick?
Hmmm not sure... it might boot if you give it 5-10 minutes, but I don't know how easy it would be for you to get feedback because of the distance. It might be worth a try, to at least see if it boots ok...
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!learn gnome-wm-bug as https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/673072
alkisg: The operation succeeded.
|10:24||* mnemoc feels important now|
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hopefully they refer the bug upstream
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which virtualization machine in ubuntu is friendlier for ltsp testing?
I've used ltsp on xenserver , virtualbox and vmware esx
none is more friendly then the other
pxe booting worked on the three?
PXE booting doesn't work very well in virtualbox-ose (needs some workarounds), but works fine in oracle virtualbox.
(no idea about other VM tools)
works fine in xenserver
good i asked, i was going to use kvm
i'm reading theregister, and i ran across a moscow teacher got forced to resign because he complaied that some program needed microsoft office to run.
and also from the article i learned that russian schools are being forced to use linux by 2011 (order on 2007)
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i gurss it's old news, butnew to me
hi cliebow :)
i never read the news..too depressing 8~)
i like to read elreg. and slashdot.
recently i like the larry ellison coverage on elreg :)
show how far behind i am..i dont know from elreg
theregister, you know about it :)
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AndyGraybeal: I think the initiative was a case where a teacher was tried because the computer store sold him computers with pirated windows... http://en.wikipedia.org/wiki/Ponosov's_case
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alkisg: that's a different case.
this one just happened.
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AndyGraybeal: I mean that afaik Ponosov's case was the reason why in 2007 it was decided that all russian schools would switch to floss
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is the ability to set a default preference in firefox, while allowing the user to easily change the default, really as hard as it seems?
it seems my only option is /etc/firefox/profile/prefs.js
but that may prompt the user on upgrades if prefs.js ever changed...
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alternately, there's user.js, but that requires the user to manually delete a file in ~/.mozilla/firefox ... and /etc/firefox/prefs/all-foo.js overrides user settings ...
can't you use Profiles?
firefox -P ProfileName
and from all menus?
you can assing each user an own profile
when someone creates a new user?
if you edit the menu item to "firefox -P `whoami`" each indivudal user should get its own profile right?
i need something that sets a global default that still allows the user to change the default
i don't think profiles is the right approach here...
want to do as little tweaking as possible
somthing like this: http://szone.berlinwall.org/node/112
that will get obliterated on upgrades...
why do you thing it gets updated?
using LTSP, can you access your local IO?
Gieltjev: why do i think what gets updated?
the all.js file, it is a settings file.. so why should firefox updater update this file?
those documents talk about editing system files outside of /etc, and so a security update to the browser would overwrite any changes made to those files.
too bad, it was just a guess
what you can do in /etc/firefox/prefs/all-YOUR-CUSTOM-FILE.js is perfect, except it silenty doesn't allow the user to change those settings.
unless there's a way to specify a setting that's more along the lines of "set if not already set"
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it's really useful to be able to easily set a global override, it's just not the use case i need right now :(
also, it seems like every few releases of firefox completely change how to do this stuff... which makes it really hard to find working documentation
yeah, not even a profile can override these settings?
don't think so
the worst is the user interface allows them to change the settings, it just won't respect the changes once they close and restart the browser.
are the original values loaded back, or are their settings still in the dialogs and not used in the browser?
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clean install of Ubuntu 10-10 LTServer. Box has single nic on internal network. I modified /etc/ltsp/dhcpd.conf with network params. using rom-o-matic floppy disk to boot old pc
never gets dhcp response
pointers on troubleshooting
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