IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 18 October 2013 (all times are UTC)
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| 04:26 | <tfdl> Hello there, Our network cable disconnected and reconnected causing ltsp clients lost of communication to server. We do not have an easy way to physically reboot the machine. Do you know of a way we can reboot ltsp via command lines on ltsp server? Many thanks to all!
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| 04:27 | Our network admin person causing this trouble.
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| 04:44 | <tfdl> hi <gdi2k> do you know a way to reboot ltsp client remotely via command line? thanks <gdi2k>.
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| 04:50 | <vagrantc> tfdl: there's no built-in way to do so
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| 04:50 | i think epoptes has support for that, though
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| 04:51 | it's possible to implement a variety of ways...
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| 04:51 | tfdl: although if the clients loose connection to the server and crash, there may be nothing you can do.
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| 04:51 | <tfdl> i am using epoptes, but epoptes can not reboot if we disconnect the network cable disgracefully like this.
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| 04:51 | <vagrantc> even if you had one of those other methods configured
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| 04:51 | once it's crashed, it's crashed
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| 04:53 | <tfdl> ok, our network guy is so troublesome.
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| 04:55 | we have almost 100 clients hidden under floating floors and over the ceilings, this is why i try to find a way to remotely reboot clients.
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| 04:56 | I think crash is the right term, because what we see right now are black screen with messages indicating the clients are trying to connect to server.
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| 05:01 | <tfdl> http://manpages.ubuntu.com/manpages/precise/man8/ldminfod.8.html
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| 05:03 | i saw the error message in syslog and google it (ldminfod) and i found <vagrantc> wrote that man page. Nice! at least it gives me some info on what i see.
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| 05:07 | Thanks <vagrantc>!
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| 05:49 | <vagrantc> heh
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| 05:50 | <vagrantc> it's not much
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| 14:13 | <bcdonadio> I was taking a look at Adminng, and it surely seems to be better than the old Admin, but it isn't able to change any config. There's a newer version somewhere?
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| 14:13 | maybe with the revolution linux guys...
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| 14:27 | <alkisg> !learn flash-no-sse2 as The latest flash plugin is compiled with SSE2 instructions and thus segfaults in older CPUs. Workaround for LTSP fat clients available in http://bazaar.launchpad.net/~ts.sch.gr/sch-scripts/trunk/view/head:/ltsp/init-ltsp.d/50-flash-no-sse2
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| 14:27 | <ltsp`> The operation succeeded.
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| 15:21 | <mgariepy> bcdonadio, no there is not.
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| 16:45 | <mgtz81> Hi, frieds, i'm new with the ltsp, i installed the solution, but i have a couple of troubbles, the client can't run with the default session type, i have to change it to Ubuntu 2D
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| 16:46 | <mgtz81> does someone could tell me what to configure to run with the default mode, 'cause other problem it's the video dep, it's around 16 bits, and running graphics the quality it's poor
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| 16:57 | <bcdonadio> mgtz81, I don't think you can have 3D acceleration with remote X sessions (as it requires direct hardware access and a powerful VGA), and even if you could the performance would be terrible
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| 16:58 | I recommend using gnome-fallback (I think this was deprecated, thought), mate, lxde, xfce or something like this...
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| 16:59 | at least I do not notice any kind of difference between 16-bit and 24-bit color depth, but you can change this in lts.conf
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| 17:03 | <||cw> mgtz81: if your clients are powerful enough to run ubuntu's unity normally, look into using the fat client option
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| 17:27 | <mgtz81> Thanks to all about your advices, i'm checking the conf to test it.
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| 17:45 | <alkisg> !bts
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| 17:45 | <ltsp`> bts: http://wiki.ltsp.org/wiki/ByTheSea_2013
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| 19:42 | <alkisg> !flash-no-sse2 | echo vagrantc:
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| 19:42 | <ltsp`> vagrantc: flash-no-sse2: The latest flash plugin is compiled with SSE2 instructions and thus segfaults on older CPUs. Workaround for LTSP fat clients available in http://bazaar.launchpad.net/~ts.sch.gr/sch-scripts/trunk/view/head:/ltsp/init-ltsp.d/50-flash-no-sse2
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| 19:42 | <alkisg> ...do we want that upstream?
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| 19:42 | <jammcq> hmm
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| 19:43 | <alkisg> (also affects localapps, of course...)
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| 20:08 | <alkisg> !flash-no-sse2 | echo vagrantc:
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| 20:08 | <ltsp`> vagrantc: flash-no-sse2: The latest flash plugin is compiled with SSE2 instructions and thus segfaults on older CPUs. Workaround for LTSP fat clients available in http://bazaar.launchpad.net/~ts.sch.gr/sch-scripts/trunk/view/head:/ltsp/init-ltsp.d/50-flash-no-sse2
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| 20:08 | <alkisg> Do we want that upstream? It also affects localapps, of course...
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| 20:21 | <vagrantc> maybe
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| 20:21 | does it have negative side-effects?
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| 20:25 | <vagrantc> it only triggers if the machine desn't already have sse2... so worst case is it still breaks?
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| 20:25 | or if the check for sse2 is imperfect...
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| 20:26 | <alkisg> vagrantc: not that I know of... it's not very widely tested, but it should work wherever that flash version works
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| 20:26 | Maybe we shouldn't include it at all for non-i386 chroots though
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| 20:26 | (althought that would be a tasks for the sysadmin that puts the older libflashplayer there...)
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| 20:26 | *task
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| 20:26 | <vagrantc> does adobe flash run on those?
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| 20:27 | amd6
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| 20:27 | 4
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| 20:27 | <alkisg> Yes, and it doesn't have the sse2 problem afaik
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| 20:28 | (it could be because anything 64bit also supports sse2, dunno...)
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| 20:28 | <vagrantc> it does seem like a very specific use-case
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| 20:28 | old hardware, old version of flash...
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| 20:29 | <alkisg> Not very old, e.g. many 5 year old AMD CPUs have that problem
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| 20:29 | I've seen bug reports from ~10 schools so I decided to automate the workaround...
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| 20:29 | <vagrantc> sure
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| 20:29 | although it stil requiries manual installation of the old flash version
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| 20:30 | at which point, you could also install the init-ltsp.d hook
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| 20:30 | <alkisg> Yup
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| 20:30 | <||cw> socket A cpus don't support sse2
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| 20:30 | <alkisg> Athlon XP 2800+ is a common case for that b ug
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| 20:30 | <||cw> nor do via C3
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| 20:31 | yeah that's a socket A
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| 20:31 | <vagrantc> alkisg: so i'm not sure it makes sense for upstream if it still requires manual configuration
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| 20:32 | <alkisg> True, here we install the older libflashplayer automatically along with sch-scripts
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| 20:32 | <vagrantc> installation of a specific version of flashplugin and all that
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| 20:33 | <alkisg> Although, for another example, if we had support for enabling/disabling the nvidia/fglrx proprietary drivers _if_ the user has installed them, I'd want that upstream in init-ltsp.d, even if it meant that the sysadmin would manually install those drivers
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| 20:33 | <vagrantc> if it were a complete fix all in one hook or set of hooks, it might make sense to upstream it
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| 20:35 | <alkisg> ...but ok, I got my answer, the !flash-no-sse2 factoid is good enough for supporting users with that issue ;)
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| 20:35 | <vagrantc> the nvidia fixes do sound like a feature worth implementing
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| 20:35 | since it's available all with apt-get install... presumably for other distros and such
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| 22:06 | <jhutchins> If the PXE server is not the DHCP server, what do I have to do?
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| 22:08 | <vagrantc> do you mean TFTP server is not the DHCP server?
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| 22:08 | !proxydhcp
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| 22:08 | <ltsp`> proxydhcp: A proxy DHCP server is defined by the PXE specification as a server which sends auxiliary boot information to clients, like the boot filename, tftp server or rootpath, but leaves the task of IP leasing to the normal DHCP server. More info: https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP
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| 22:08 | <vagrantc> proxydhcp is a good way to go when you have a separate DHCP server, too.
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| 22:09 | as long as you're not interfering with other network boot services provided by the existing dhcp infrastructure
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