IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 15 November 2012 (all times are UTC)
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| 10:12 | <markit> hi, after adding LDM_DIRECTX=True, what I must restart (I don't want to restart the server, that is providing other services to the lan)
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| 10:12 | ?
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| 10:21 | <Hyperbyte> markit, hi
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| 10:22 | lts.conf is loaded by a client during boot, from the tftp server.
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| 10:22 | <markit> hi Hyperbyte :) I've suggested that line to a friend of mine, but tells me now that clients are stuck to the ubuntu screen... and if he removes, it does not work anymore
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| 10:22 | <Hyperbyte> Restarting an LTSP server is only necessary for kernel upgrades.
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| 10:22 | <markit> and he can't reboot the server
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| 10:23 | <Hyperbyte> markit, tell him to pastebin the lts.conf file, see what typo he's made. :)
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| 10:23 | Also, you could try
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| 10:23 | !quiet-splash
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| 10:23 | <ltsp> quiet-splash: to disable the splash screen in Ubuntu, in order to see any boot error messages, run sudo gedit /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default and remove quiet splash plymouth:force-splash vt.handoff=7
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| 10:23 | <markit> Hyperbyte: he restored the original one, but does not work anymore
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| 10:24 | Hyperbyte: he told me that with ctrl+esc he reads "Negotiation"
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| 10:25 | is of any help?
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| 10:25 | but system working -> modify lts.conf -> system not working -> restore lts.conf -> yet not working!
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| 10:26 | he has a minimal lts.conf, the only strange custom line is of a LDM_XSESSION="blablabla" one
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| 10:27 | <Hyperbyte> markit, I bet he did more than just modify lts.conf
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| 10:27 | I bet he also rebuilt the client image, because he thought it was necessary. Correct?
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| 10:27 | <markit> I'll ask him, but dubt... is a system he has fear of touch
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| 10:27 | <alkisg> Maybe his lts.conf has a syntax error, tell him to pastebin it
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| 10:28 | <markit> and I told him explicitly that was the ONLY thing to do
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| 10:28 | hi alkisg :)
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| 10:28 | he copied as .bak and now restored
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| 10:28 | <Hyperbyte> I'm with alkisg on this one. Or actually alkisg is with me, because I already suggested it earlier. :P
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| 10:28 | Pastebin the file. :)
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| 10:29 | alkisg, Fedora has an "fpaste" command, which is used extensively by the #fedora folk for pastebin. You can just pipe whatever output to the command, and it will pastebin it and provide a link. Is there something like this in Ubuntu?
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| 10:29 | <markit> ok, I have to hide the real name of a custom part, because don't want to have him discovered
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| 10:32 | here http://pastebin.com/ewjETGaP
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| 10:32 | <Hyperbyte> Wow.
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| 10:32 | 11:26 <markit> he has a minimal lts.conf <--- ????
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| 10:32 | <markit> seems so
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| 10:33 | he complains clients are slow like hell
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| 10:33 | and a ton of other problems
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| 10:33 | so I suggested the ldmdirect stuff
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| 10:34 | <dav_> ecco
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| 10:34 | <markit> hi dav_ :)
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| 10:34 | <dav_> ci sono, ti scrivo da Trento
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| 10:34 | <Hyperbyte> markit, remove XRANDR_DISABLE = False
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| 10:34 | <markit> alkisg, Hyperbyte: dav_ is the guy I told you about
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| 10:34 | <Hyperbyte> Also remove LOCAL_DEV = True
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| 10:34 | <markit> dav_: english only here
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| 10:34 | <Hyperbyte> Those are defaults
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| 10:35 | <markit> Hyperbyte: ok, but then don't hurt, no?
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| 10:35 | <dav_> ok, I try
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| 10:35 | <Hyperbyte> markit, why make your config more complicated than it needs to be?
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| 10:36 | <markit> Hyperbyte: sure, just that we have to make it work again, and those lines were there before, but ok
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| 10:36 | <Hyperbyte> What happens when you comment out the LDM_XSESSION line?
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| 10:36 | Hi dav_ :)
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| 10:36 | <dav_> Hi
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| 10:36 | <markit> alkisg: I've not epoptes here handy, the ssh assistance has a default port or is something I have to tell to the assisted one? Like ip:port?
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| 10:37 | <dav_> nothing
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| 10:37 | <Hyperbyte> dav_, after you updated the lts.conf file - did you run ltsp-update-image?
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| 10:37 | <markit> dav_: comment and restart the client, of course
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| 10:37 | <Hyperbyte> (don't run it, the correct answer is 'no')
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| 10:37 | <dav_> no, only restart a client
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| 10:37 | <Hyperbyte> Okay
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| 10:39 | <Hyperbyte> dav_, so you commented the LDM_XSESSION line and still the client is stuck at the splash screen after a restart?
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| 10:39 | <dav_> i don't know if a ltsp-update-image works
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| 10:39 | yes
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| 10:39 | <Hyperbyte> dav_, no, don't ltsp-update-image. It's not needed.
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| 10:39 | dav_, do this: mv lts.conf lts.conf.disabled
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| 10:40 | Then reboot client.
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| 10:40 | Also do this
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| 10:40 | !quiet-splash
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| 10:40 | <ltsp> quiet-splash: to disable the splash screen in Ubuntu, in order to see any boot error messages, run sudo gedit /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default and remove quiet splash plymouth:force-splash vt.handoff=7
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| 10:47 | <markit> from theory and pratice there is no difference... in theory ;P
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| 10:49 | <alkisg> markit: the port is 5500
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| 10:57 | <markit> 5500 is for vnc, I meant ssh
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| 10:58 | ok, we have lost dav_ connection, he tells me that tries to rebuild the image (sigh!) and reboot the server
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| 11:02 | Hyperbyte: thanks for the help, wondering what could have been wrong there
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| 11:23 | <Hyperbyte> It's always interesting when novice administrators try to employ Windows methods to fix systems, like rebooting and reinstalling
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| 11:44 | <markit> mmm I've a dvi-to-vga adapter, and seems ltsp isn't able to get the right resolution :(
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| 11:45 | I will have to force in lts.conf, hope to be able, but in any case sad situation
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| 12:07 | <markit> mm there is no way to force at 1280x1024, it's still at 1024x768. I can put at 800x600, so seems that the XRANDR_MODE_0 works
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| 12:09 | am I missing something?
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| 12:13 | <Hyperbyte> markit, problem with DVI-VGA adapters is that it doesn't allow dynamic resolution detection anymore
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| 12:13 | Or whatever it's called.... it causes the screens to detect wrong resolution by default. It becomes even more problematic if you use dual screens
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| 12:13 | <markit> Hyperbyte: ok, but I try to force, and does not obey if greater than 1024x738
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| 12:13 | <Hyperbyte> My advice: avoid them like the plague.
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| 12:14 | markit, that's probably because the video card is convinced the screen doesn't support it
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| 12:14 | <markit> Hyperbyte: unfortunately we have old monitors, and 2 new computer that have hdmi and dvi, not vga
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| 12:14 | <Hyperbyte> markit, on the said computer, type "xrandr"
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| 12:14 | If it doesn't show the mode you want, you'll have to add a new mode (see xrandr --help)
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| 12:14 | * markit now testing with my own monitor that has dvi, just to be sure that it works fine with it | |
| 12:14 | <Hyperbyte> And then once the new mode is added, you can choose it.
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| 12:15 | <markit> Hyperbyte: ok, but I need it automatically done by ltsp
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| 12:15 | <Hyperbyte> markit, I'm not sure if LTSP can do it for you
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| 12:15 | You would probably have to script it, and then run that script using RC_FILE in lts.conf
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| 12:16 | But - I'm not sure when RC_FILE gets executed. If it's before X is loaded, then it won't work.
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| 12:16 | You would then have to hack it in somewhere else... maybe in LDM scripts
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| 12:16 | <markit> sigh :(
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| 12:18 | <Hyperbyte> http://ubuntuforums.org/showthread.php?t=1033066
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| 12:18 | <markit> thanks
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| 13:04 | <khildin> anyone: what was that linux alternative for iTalc again?
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| 13:04 | I think alkisg was involved with it...
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| 13:06 | <khildin> nm... I found it: Epoptes
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| 13:11 | <andygraybeal> khildin! aye
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| 13:12 | <khildin> hey andy... :)
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| 13:46 | <markit> khildin: yep, epoptes, is also included in ubuntu / debian now
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| 13:47 | <khildin> I know and it rocks... :)
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| 13:47 | <markit> we are proud of it ;P
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| 13:47 | <alkisg> Hyperbyte: there's pastebinit in ubuntu
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| 13:47 | command | pastebinit, and then paste the link here
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| 13:48 | <khildin> I just was pointing someone on a forum to epoptes but could't remember the exact name... but after a bit of digging in my memory things came back.... ;)
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| 13:49 | in a 100% ubuntu environment epoptes outperforms iTalc bigtime... but if there is a mixed environment you have to use iTalc
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| 13:49 | <markit> khildin: schools must avoid proprietary software for educational and ethical and pratical reasons, one more pratical reason for doing that ;P
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| 13:49 | <alkisg> markit: what is "LOCAL_DEVICE_01=/dev/sr0:cdrom ?
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| 13:50 | <markit> alkisg: I've no idea, I guess to have access to local cdrom of the clients?
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| 13:50 | <alkisg> Also, setting XSESSION isn't recommented...
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| 13:50 | markit: it's not an ltsp variable
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| 13:50 | <markit> alkisg: is a configuration that did some "guru" to his school, and things don't go well
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| 13:50 | <alkisg> So it probably doesn't do anything
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| 13:50 | <khildin> I agree, but as long money hungry 'advisors' have a lot of influence on decision makers... that won't happen... :-/
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| 13:51 | <markit> he asked me for help, but we don't have to make the "installer" understand my "friend" is trying to fix himself
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| 13:51 | <alkisg> markit: sure, LDM_DIRECTX=True should help a lot with performance
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| 13:51 | <markit> khildin: I never stop to fight ;P
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| 13:51 | alkisg: yep, but after inserting it the client were not logging anymore
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| 13:51 | <khildin> we both won't stop the fight then... :)
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| 13:52 | <markit> khildin: happy to hear it :))
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| 13:52 | alkisg: I don0t know how skilled my "friend" is, but should be enough to change the config file
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| 13:52 | <alkisg> markit: and what does the secret XSESSION script do? Maybe it relies on weird stuff?
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| 13:52 | <markit> alkisg: private?
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| 13:52 | <alkisg> I don't think the problem was LDM_DIRECTX though
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| 13:52 | Sure
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| 13:53 | <khildin> there is a big implementation of LTSP cluster in the Netherlands... 2K+ clients... I always point people to that example. It shows LTSP is stable and robust...
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| 13:54 | But I do wish more schools have the guts to take that step too
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| 13:55 | <alkisg> We have around 300 here, so 3000+ clients
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| 13:57 | * markit has troubles with his 24 clients | |
| 13:58 | <markit> I mean, performances don't scale that well in thin clients if you use i.e. impress with images
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| 13:58 | and I've KDE not working in fat mode, sigh
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| 13:58 | khildin: btw, do you use KDE? or kde with nfs home shared (outside ltsp, I mean..)
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| 13:59 | <khildin> no... I am one of those unity lovers... :P
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| 14:04 | <markit> I would run for xfce if I had not put kde everywhere in 4 schools
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| 14:04 | and teachers are not willing to learn again something new
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| 14:10 | <alkisg> 10:57<markit>5500 is for vnc, I meant ssh ==> epoptes isn't using ssh, it's using socat in port 5500 by default
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| 14:10 | ssl + gnu screen
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| 14:11 | 11:44<markit>mmm I've a dvi-to-vga adapter, and seems ltsp isn't able to get the right resolution :( => X_HORZSYNC / X_VERTREFRESH
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| 14:11 | * alkisg gets throught the irc logs :P | |
| 14:12 | <markit> alkisg: isn't available "reverse ssh" in epoptes?
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| 14:12 | <alkisg> Not "ssh", reverse console with ssl + gnu screen
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| 14:12 | This way you don't have to share a user account
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| 14:12 | <markit> ok, and not on port 5500 that is for vnc, right?
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| 14:12 | <alkisg> On port 5500, just for interface simplicity
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| 14:12 | <markit> oh! I have to change my doc then
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| 14:13 | <alkisg> You can define a port with server:port if you want
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| 14:13 | But the default is 5500
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| 14:14 | <markit> !socat
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| 14:14 | <ltsp> socat: One way to share a console with a remote person is: [local pc] forward port 5500, run: socat tcp-listen:5500,keepalive=1 stdio,raw,echo=0 [remote pc] socat tcp:server:5500 SYSTEM:"{ sleep 1; xterm -e screen -xRR ra$$; } & exec screen -S ra$$",pty,stderr
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| 14:14 | <andygraybeal> awesome :)
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| 14:15 | <alkisg> The "remote pc" part is done by epoptes, the technician does the first part
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| 14:15 | <markit> alkisg: clever, since I have to redirect 5500 for vnc, but this way we can't have vnc AND ssh + gnu screen at the same time... can it be a problem? maybe not
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| 14:15 | <alkisg> markit: why would you want that? But if you do want it, just put server: port
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| 14:16 | <markit> ok, great, I do have to test it's performance, I was impressed when you were able to assist me with vnc and my low bandwidth connection
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| 14:17 | * alkisg has been doing this many times a day for some time now, to support greek teachers... | |
| 14:17 | <alkisg> I only had to use socat in a couple of cases, e.g. when the school had ISDN connection instead of ADSL
| |
| 14:18 | <markit> oh, I recall now that I still have to investigate for the LiBo problem with embedded links instead of images and a low bandwidth connection
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| 14:19 | but the things that bugs me most is the kde on nfs problem
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| 14:19 | hope to have time tonight to do some further steps in creating a test environment easy to setup
| |
| 14:21 | <alkisg> I think there's a problem where after the sshfs call, it takes some time for the mount to become available... I saw that in gnome one time too, and I got prompted by an ssh_askpass dialog, and the whole /home/username got unavailable
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| 14:21 | And while checking KDE, I saw that it managed to create some files under /home/username *locally* on the client
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| 14:22 | So *one* of the KDE problems might be an sshfs-related problem
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| 14:22 | <markit> alkisg: I've tried, outside ltsp, to have a nfs mount, and there is the same problem if I don't disable nepomuk and let akonadi use mysql. There is a service that crashes multiple time so probably fetches stuff a lot of time until is not started anymore
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| 14:23 | BUT I had no time to disable nepomuk and put akonadi use sqllite3 in that environment
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| 14:23 | <alkisg> That's another of KDE problems with networked /home, I think there are multiple problems there
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| 14:24 | <markit> NFS mounted home should be a common configuration for business... but seems few business use KDE and gnu linux
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| 14:24 | or both
| |
| 14:24 | I've found some posts of people that claim to have that stuff working, I emailed them but no answer
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| 14:24 | <alkisg> Or few KDE developers use NFS :)
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| 14:24 | <markit> none I guess
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| 14:25 | and also SSD is more and more common among developers
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| 14:25 | so also slow I/O is not imediately evident to them more and more
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| 14:25 | we are bloating GNU DE a lot
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| 14:26 | * alkisg thinks LXDE will get more users in the future ;) | |
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| 14:27 | <andygraybeal> lxde! yay
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| 14:28 | <markit> I've to run now, thanks a lot for everything
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| 14:28 | <alkisg> bb
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| 18:16 | * vagrantc waves | |
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| 18:19 | <alkisg> Hi Vagrant
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| 18:19 | Hi all
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| 22:32 | <wicksey> kev_j, I've brought my cups config home from work. Want it or did you fix it?
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