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


Channel log from 14 June 2014   (all times are UTC)

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07:45
<valeriobozzolan>
Why in the LTSP docs apparently there is no word about fat clients?
07:46
(In ltsp.org i say)
07:50
It's OK that this topic is taken only on distro-secific documentation?
08:01
If someone one day want to add fat clients documentations in ltsp.org wiki, can? Or is better no because it's a thing related to the distro?
08:01
<alkisg>
We don't have enough people for documentation
08:02
<valeriobozzolan>
Ahn! :)
08:02
<alkisg>
We started fat clients 3-4 years ago, noone has come up to document them
08:02
<valeriobozzolan>
Clear :)
08:02
<alkisg>
If you want, you can become a documentation person :)
08:03
<valeriobozzolan>
Always, if i works on something and I must remember how i've done it, I edit the related wiki of the project.
08:03
So if one day I test FAT... <3
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08:31
<alkisg>
So you've already edited the pages for thins? Nice! :)
08:35
<valeriobozzolan>
But I've noticed that everything I've needed it's yet written :)
08:35
Even the NoAccel
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08:59
<Hyperbyte>
alkisg, hi!
08:59
<valeriobozzolan>
( OK, now I'll remember forever hot to fix my problem :D http://wiki.ltsp.org/wiki/Troubleshooting#Video_problems )
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09:29
<alkisg>
Hi Hyperbyte :)
09:43
<Hyperbyte>
alkisg, I need to cut down on bandwith usage on my network with fat clients. Any tricks?
09:44
NBD compression, for example? Or is that already enabled with ltsp-pnp?
09:50
<alkisg>
Hyperbyte: it's already enabled, unless you upgraded from stock 12.04
09:51
Hyperbyte: you can use local nbd caching
09:51
!local-boot
09:51
<ltsp>
local-boot: If you want LTSP fat clients on a low-speed network, you can put i386.img on e.g. C:\Boot\LTSP\i386.img and use this command line in pxelinux.cfg: APPEND ro initrd=ltsp/i386/initrd.img init=/sbin/init-ltsp root=/dev/sda1 rootflags=ro loop=/Boot/LTSP/i386.img; IPAPPEND 3
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09:58
<Hyperbyte>
Diskless clients. :)
10:00
<alkisg>
Hyperbyte: you can't decrease the network bandwidth without putting it somewhere else
10:00
So, decide, either more NICs on the server etc, or load balancing (e.g. NFS home elsewhere), or local caching with e.g. usb sticks
10:00
There are some new usb sticks that are extremely fast, ssd-lie
10:00
like
10:01
So, with e.g. 20€/client, you can increase the "virtual disk speed" of the clients 10 times or more
10:02
<Hyperbyte>
Nah, problem isn't NICs on server... problem is I'm having loads of audio streams on my network and they're being bothered by LTSP somehow
10:02
I need to figure out how to seperate this at the physical (switch) level
10:02
But I wondered if there is also trick to get bandwith usage down, even if just a little.
10:03
<alkisg>
Hyperbyte: you mean that the bandwidth is enough, and you're having QoS problems?
10:05
(actually, 5€/client should be enough for an 4 or 8 GB USB 3 stick)
10:05
bbl...
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13:49
<Hyperbyte>
alkisg, hrm... logging in to 14.04 LTSP here at the radio station with ltsp-pnp takes a reeeeeally long time. Like half a minute before it shows desktop, if not longer. Doesn't take that long if I log in over plain SSH. Any ideas?
13:53
Just measured. 45 seconds.
13:54
Hrm, looks like logging out and then logging back in is lightning fast.
14:13
Anyone got any ideas how to remove "Power off" from the menu in 14.04?
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15:02
<alkisg>
Hyperbyte: http://www.epoptes.org/documentation/lan-benchmark
15:03
Post the results of that whenever you can
15:03
(I assume fat clients)
15:05
<Hyperbyte>
alkisg, you assume correctly. I will check this later.
15:06
<alkisg>
Hyperbyte: about poweroff, you'd need to edit the /usr/share/polkit-1/actions/*.policy files
15:07
./org.freedesktop.login1.policy
15:08
<action id="org.freedesktop.login1.power-off">
15:08
<allow_active>yes</allow_active> => no
15:09
Same for reboot etc
15:15
<Hyperbyte>
Hrm, I'm gonna delay deployment of 14.04 for a bit until I figure this out completely.
15:15
Can you write me a small script that makes these changes to the policies on the fly?
15:16
Just some line that replaces the yes with a no
15:17
<alkisg>
Sorry, too busy (got enough work for the next 20 months or so :D), but you can edit the file, save it as a copy, and put an RCFILE_01="mv symlink to file" lts.conf directive to do that
15:17
<Hyperbyte>
Thing is, I only need to disable shutdown for -some- specific clients from lts.conf. So I need to invoke some script that makes the changes.
15:17
Hrm... I guess that'd work.
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17:35
<gbaman>
vagrantc: have you got any experience with bootchart?
17:38
<vagrantc>
i think i ran it once 5 years ago
17:38
<gbaman>
trying to run it with pis
17:38
LTSP isnt very happy
17:39
but there is something causing a 20 second pause
17:39
which I am trying to track down
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17:42
<gbaman_>
and apparently I timed out
17:48
here is the error - https://dl.dropboxusercontent.com/u/1122948/temp/photo%201-3.JPG
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21:14
<gbaman>
vagrantc: been trying to find what has been causing a 10-20 second pause in Raspi-LTSP boot recently, have traced it (using a lot of echos) to etc/init.d/networking to the marked line here http://pastebin.com/ynpjUaPj
21:14
any ideas?
21:14
actually, wait one sec
21:19
ok, it looks like it is sitting waiting for an NFS server?
21:20
for 20 seconds?
21:22
<vagrantc>
gbaman: this has been happing all along, or just with a new server, or what?
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21:43
<gbaman>
seems to be caused by NFS 4? Mounting with NFS 3 takes under a second, NFS 4 takes 16 seconds?
21:44
<vagrantc>
haven't used NFSv4
21:44
<gbaman>
in LTSP?
21:46
it is taking exactly the same amount of time mounting the same drive via NFS4 on another machine as the client is hanging for on boot
21:48
<vagrantc>
aven't used NFSv4 at all.
21:48
<gbaman>
LTSP though is using it..
21:48
<vagrantc>
not my LTSP
21:49
<gbaman>
:)
21:49
<vagrantc>
not the default in Debian...
21:49
<gbaman>
is mounting it even when using NBD?
21:49
which is weird..
21:50
<vagrantc>
sounds like you have an unusual setup :P
21:50
<gbaman>
I am using Pis, of course my setup is unusual :)
22:03
<vagrantc>
the pi LTSP test setups i've done did nothing unusual...
22:08
<gbaman>
might just be something weird with my network..
22:08
will try on another network when I get a chance
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