IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 26 March 2014 (all times are UTC)
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| 14:07 | <nroussi> Hi everyone, just updated my ltsp server and now the clients drop to busybox. Tried a lot of things but nothing works. Can anyone suggest something?
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| 14:49 | <eibbor> most likely the display manager conf has changed and it isnt accepting connections.
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| 14:50 | sbalneav: crikeys your still here. Hi Scott.
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| 15:22 | <nroussi> hi everyone. Some more info. I am running ltsp-cluster with a root server and 4 app servers. Everything was working perfectly fine until yesterday when I updated the root server and the app servers. Now clients drop to busybox. I have googled this for hours but cannot figure it out. Can anyone please help?
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| 15:23 | running 12.04 64-bit root server and 32-bit app servers with 32 but clients
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| 15:26 | <cliebow> scottie stays logged in..but havnt spoken since by0the-sea
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| 15:26 | !seen sbalneav
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| 15:26 | <ltsp`> sbalneav was last seen in #ltsp 2 weeks, 0 days, 23 hours, 6 minutes, and 20 seconds ago: <sbalneav> Are you using ldap?
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| 15:27 | <cliebow> nroussi: too far behind to help you..guess you ll have to be patient
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| 15:41 | <nroussi> !nbd-client
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| 15:41 | <ltsp`> nbd-client: To try mounting the NBD image from the client initramfs: nbd-client 192.168.67.1 -N /opt/ltsp/i386 /dev/nbd0
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| 16:17 | <Pablos_> hi
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| 16:17 | Hope someone can help me
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| 16:17 | i'm runnung a ltsp (this is why i'm here hahaha)
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| 16:18 | In a client i want to know the thin client MAC
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| 16:18 | something like ltsp-localapps ipconfig
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| 16:19 | <alkisg> echo $LTSP_CLIENT
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| 16:19 | Without ltsp-localapps...
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| 16:20 | echo $LTSP_CLIENT_MAC, LTSP_CLIENT_HOSTNAME etc
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| 16:20 | env | grep ^LTSP shows the whole list
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| 16:20 | <Pablos_> OMG
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| 16:20 | THX
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| 16:20 | <alkisg> np
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| 16:20 | <Pablos_> this is simply amazing
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| 16:23 | <nroussi> hi alkisg, I have an issue. Think you can help out? http://alkisg.mysch.gr/steki/index.php?topic=5713.msg64465#msg64465
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| 16:24 | <alkisg> nroussi: hi, ltsp-cluster is pretty much unmaintained...
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| 16:24 | I've never used it personally
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| 16:24 | <nroussi> I know but it was working fine up until I updated. There is a problem with the nbd
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| 16:24 | <alkisg> What's the ltsp-client version/
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| 16:24 | ?
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| 16:25 | In the chroot... dpkg -l ltsp-client|grep ^ii
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| 16:25 | <nroussi> ii ltsp-client 5.3.7-0ubuntu2.7
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| 16:25 | <alkisg> Also, try restarting the server, nbd-server has a rare bug where it hangs and `service nbd-server restart` doesn't restart it
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| 16:25 | Or, service nbd-server stop; killall -9 nbd-server etc etc
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| 16:26 | I.e. the nbd-server process doesn't die with a plain kill if it's hanged; it needs kill -9
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| 16:26 | <nroussi> ok. What should be in /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default ?
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| 16:27 | <nroussi> I have: default ltsp
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| 16:27 | <alkisg> You don't use the greek schools ppa, right?
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| 16:27 | <nroussi> no
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| 16:28 | and: append ro initrd=initrd.img root=/dev/nbd0 init=/sbin/init-ltsp vt.handoff=7
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| 16:28 | <alkisg> Then your ltsp version is very old, I don't remember the contents of pxelinux.cfg/default exactly, but yeah something like that ^
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| 16:28 | But your nbd-server configuration should have :ltsp_i386, not /opt/ltsp/i386 in vanilla 12.04, afaik
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| 16:29 | Anyway, I don't have access to any vanilla 12.04 systems, so better wait for help from someone that doesn't have the greek schools ppa in his sources...
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| 16:30 | <nroussi> in the file /etc/nbd-server/conf.d/ltsp_i386.conf ?
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| 16:30 | <alkisg> Yup
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| 16:33 | <nroussi> and on which ports is nbd-server supposed to run? I have 10809 in /etc/services but in /etc/inetd.conf I have 9571,9572 and 2000
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| 16:35 | <alkisg> Those are just leftovers that were not removed in 12.04 vanilla
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| 16:36 | The ldm-server in 9571 is ok though
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| 16:36 | nbd-server should be on 10809, both for i386.img and swap
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| 16:37 | For Greek LTSP users, I strongly suggest _not_ using vanilla Ubuntu/LTSP, it has a lot of issues that are solved in the Greek schools ppa
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| 16:38 | <nroussi> when I run netstat -nap I see inetd running on 9572 and 9571 and 2000.
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| 16:39 | <alkisg> 9571 stream tcp nowait nobody /usr/sbin/tcpd /usr/sbin/ldminfod
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| 16:39 | You should only have that one in inetd.conf
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| 16:40 | The others don't cause any harm, but they're not used either, they shouldn't be there
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| 16:40 | <nroussi> ok, I commented out the line that started with 2000 but the one for 9572 shows that nbd_swap was running on it.
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| 16:40 | 9572 stream tcp nowait nobody /usr/sbin/tcpd /usr/sbin/nbdswapd
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| 16:42 | how do I make sure that nbd-server for the .img and swap are running on 10809?
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| 16:42 | <alkisg> !nbd-client
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| 16:42 | <ltsp`> nbd-client: To try mounting the NBD image from the client initramfs: nbd-client 192.168.67.1 -N /opt/ltsp/i386 /dev/nbd0
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| 16:42 | <alkisg> With -N swap you test swap...
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| 16:44 | <nroussi> so nbd-client <serverIP> -N swap /dev/nbd0 ?
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| 16:46 | <alkisg> Yup, either from an ltsp client or from some other pc that has nbd-client installed
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| 16:46 | Check that /dev/nbd0 is not in use... (it is on ltsp clients)
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| 16:49 | <nroussi> ok going over to check now.
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| 17:11 | ok when I run nbd-client <ip> -N swap /dev/nbd0 I get: Negotiation: ..size=512MB os=1024, sz=536870912 bytes
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| 17:11 | then nbd0: unknow partition table
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| 17:30 | <Mark____> Can anyone help out with Linux mint 13 no wired or wireless connection?
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| 17:32 | <alkisg> nroussi: then your swap works and you don't need port 9572
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| 17:35 | <nroussi> ok but if I run on the client nbd-client <ip> -N /opt/ltsp/i386 /dev/nbd0 I get a lot of errors
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| 18:13 | <alkisg> nroussi: what errors?
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| 18:50 | <nroussi> alkisg: block nbd0: attempted send on closed socket
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| 18:51 | <alkisg> nroussi: the same thing happens if you reboot your server?
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| 18:51 | <nroussi> rebooting now
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| 19:01 | now I see the ltsp login shell. I removed quiet splash and vthandoff from pxelinux.cfg/default. I will go to log in and see if I can find a log somethere
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| 20:02 | <Ark74> alkisg, quick question, is there a way to run a command through epoptes as root
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| 20:02 | <alkisg> From the execute dialog, run sudo command
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| 20:02 | It works even if the user isn't a sudoer
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| 20:03 | <Ark74> really that easy?
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| 20:06 | <alkisg> Yup
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| 20:17 | <Ark74> at the end i didn't needed the root :P
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| 20:18 | i'm using vlc & xtrlock for streaming, with great results :)
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| 20:19 | this is what i was looking for, thanks again alkisg for pointing in the right direction ;)
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| 20:24 | <alkisg> Ark74: do tell more about your streaming solution
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| 20:25 | <Ark74> well, i use the server to stream a video *file*
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| 20:25 | so far streaming desktop and other streams as youtube is not a good idea
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| 20:25 | *desktop screen
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| 20:26 | sending the order to play the stream on the clients on full screen
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| 20:26 | then lock the clients using xtrlock
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| 20:26 | <alkisg> What vlc parameters are you using?
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| 20:26 | <Ark74> (both commands send with epoptes)
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| 20:26 | i'm using theora
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| 20:27 | 1100 kbps video - 128 kpbs audio
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| 20:27 | <alkisg> Ah, you only stream files that have a specific encoding?
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| 20:27 | <Ark74> it's around 4MB per client
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| 20:27 | <alkisg> Or do you use transcoding?
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| 20:28 | <Ark74> yeah, transconding
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| 20:28 | the stream done using http
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| 20:29 | i used the default 8080 port, since i have nothing else using it
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| 20:30 | at the end just kill vlc & xtrlock, and i'm done ;)
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| 20:30 | <alkisg> That takes too much cpu though... I would like to find a solution that wouldn't need transcoding
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| 20:32 | For example, gstreamer supports multiple outputs of the same video stream, so I was able to play something as the teacher it totem, and have it projected to all the client screens, but of course that wasn't automated, it was manual...
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| 20:33 | <Ark74> is not that too much cpu, at least not for the server
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| 20:34 | <alkisg> Depending on the input video stream, in some cases it's possible to do transcoding, but in some others the video needs to be decoded + reencoded from scratch,
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| 20:34 | in those cases, it needs 100% cpu of some dual core server...
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| 20:35 | !flash
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| 20:35 | <ltsp`> flash: Yes, flash sucks. An HD full screen 30 fps video needs 2.5 Gbps bandwidth (1920×1080×4×30)! Make sure you have LDM_DIRECTX=True in your lts.conf file, or if it's just youtube you're after, try some flash replacing plugin like http://linterna-magica.nongnu.org
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| 20:35 | <alkisg> ...encoding 2.5 Gbps is hard...
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| 20:35 | <Ark74> well, yeah that sucks
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| 20:35 | <alkisg> It needs 8 cores or more for full hd
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| 20:41 | <Ark74> mpeg 4, transcodes really nice
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| 20:44 | h264 no so nice
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| 22:30 | <nroussi> Can anyone else try to help figure out an issue with ltsp-cluster? I am getting the login prompt on screen 1 but on screen 7 I am getting /usr/share/ltsp/screen_session: [: illegal number:
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